Gotowe bibliografie tematyczne / Amines

Gotowa bibliografia na temat „Amines”

Autor: Grafiati
Data publikacji: 4 czerwca 2021
Data aktualizacji: 7 lipca 2024

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Artykuły w czasopismach na temat "Amines"

1

Budynina, Ekaterina, Konstantin Ivanov, Ivan Sorokin i Mikhail Melnikov. "Ring Opening of Donor–Acceptor Cyclopropanes with N-Nucleo­philes". Synthesis 49, nr 14 (18.05.2017): 3035–68. http://dx.doi.org/10.1055/s-0036-1589021.

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Ring opening of donor–acceptor cyclopropanes with various N-nucleophiles provides a simple approach to 1,3-functionalized compounds that are useful building blocks in organic synthesis, especially in assembling various N-heterocycles, including natural products. In this review, ring-opening reactions of donor–acceptor cyclopropanes with amines, amides, hydrazines, N-heterocycles, nitriles, and the azide ion are summarized.1 Introduction2 Ring Opening with Amines3 Ring Opening with Amines Accompanied by Secondary Processes Involving the N-Center3.1 Reactions of Cyclopropane-1,1-diesters with Primary and Secondary Amines3.1.1 Synthesis of γ-Lactams3.1.2 Synthesis of Pyrroloisoxazolidines and -pyrazolidines3.1.3 Synthesis of Piperidines3.1.4 Synthesis of Azetidine and Quinoline Derivatives3.2 Reactions of Ketocyclopropanes with Primary Amines: Synthesis of Pyrrole Derivatives3.3 Reactions of Сyclopropane-1,1-dicarbonitriles with Primary Amines: Synthesis of Pyrrole Derivatives4 Ring Opening with Tertiary Aliphatic Amines5 Ring Opening with Amides6 Ring Opening with Hydrazines7 Ring Opening with N-Heteroaromatic Compounds7.1 Ring Opening with Pyridines7.2 Ring Opening with Indoles7.3 Ring Opening with Di- and Triazoles7.4 Ring Opening with Pyrimidines8 Ring Opening with Nitriles (Ritter Reaction)9 Ring Opening with the Azide Ion10 Summary
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2

Barham, Joshua P., i Jaspreet Kaur. "Site-Selective C(sp3)–H Functionalizations Mediated by Hydrogen Atom Transfer Reactions via α-Amino/α-Amido Radicals". Synthesis 54, nr 06 (25.10.2021): 1461–77. http://dx.doi.org/10.1055/a-1677-6619.

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AbstractAmines and amides, as N-containing compounds, are ubiquitous in pharmaceutically-active scaffolds, natural products, agrochemicals, and peptides. Amides in nature bear a key responsibility for imparting three-dimensional structure, such as in proteins. Structural modifications to amines and amides, especially at their positions α to N, bring about profound changes in biological activity oftentimes leading to more desirable pharmacological profiles of small drug molecules. A number of recent developments in synthetic methodology for the functionalizations of amines and amides omit the need of their directing groups or pre-functionalizations, achieving direct activation of the otherwise relatively benign C(sp3)–H bonds α to N. Among these, hydrogen atom transfer (HAT) has proven a very powerful platform for the selective activation of amines and amides to their α-amino and α-amido radicals, which can then be employed to furnish C–C and C–X (X = heteroatom) bonds. The abilities to both form these radicals and control their reactivity in a site-selective manner is of utmost importance for such chemistries to witness applications in late-stage functionalization. Therefore, this review captures contemporary HAT strategies to realize chemo- and regioselective amine and amide α-C(sp3)–H functionalization, based on bond strengths, bond polarities, reversible HAT equilibria, traceless electrostatic-directing auxiliaries, and steric effects of in situ-generated HAT agents.1 Introduction2 Functionalizations of Amines3 Functionalizations of Carbamates4 Functionalizations of Amides5 Conclusion
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Manthey, MK, SG Pyne i RJW Truscott. "Addition of Aliphatic and Aromatic Amines to Catechol in Aqueous Solution Under Oxidizing Conditions". Australian Journal of Chemistry 42, nr 3 (1989): 365. http://dx.doi.org/10.1071/ch9890365.

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The oxidation of catechol in the presence of two aliphatic and aromatic amines has been investigated. In aqueous solutions of pH 7.0 and 11.7, the substitution pattern of the adduct was dependent on the type of amine used. Aromatic amines produced 4,5-disubstituted o-quinones, whereas aliphatic amines gave either 2,4,5-trisubstituted or 2,4-disubstituted o-quinone adducts. A rationale based upon the stability of vinylogous amides is presented to account for the observed substitution pattern.
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4

Os, Van M., Van A. M. Vuuren i S. F. Spoelstra. "Mechanisms of adaptation in sheep to overcome silage intake depression induced by biogenic amines". British Journal of Nutrition 77, nr 3 (marzec 1997): 399–415. http://dx.doi.org/10.1079/bjn19970041.

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Effects of biogenic amines on silage intake and rumen fermentation during dietary changes were studied in sheep. Two direct-cut grass silages were prepared from a single grass sward, one untreated (WAS) and one treated with 4·0 litres formic acid (850 ml/1) per tonne (FAS). Diets of FAS, and FAS supplemented with 7·2 g biogenic amined/kg DM (FAS +A), were offered ad libitum, once daily to four rumen-cannulated, and four intact wethers in a repeated crossover design experiment. During a pre-period before each crossover, the animals were offered either the silage low in biogenic amines (FAS), or that containing moderate concentrations (WAS). During the first 4 d of the FAS+A treatment, the added biogenic amins tended to lower daily DM intake (DMI) and lowered significantly the DMI during the principal meal after feeding. This acute effect on DMI tended to be reduced when the sheep were previously preconditioned to amines by feeding WAS, and the acute DMI depression during the principal meal was significantly reduced. At the end of the 14 d FAS+A feeding period daily DMI was similar to that of the FAS treatment, but the daily pattern of intake remained different, with lower intake of FAS+A during the first 5 h after feeding, this being compensated for by the end of the day. Rumen fermentation tended to be less during the first 4 d that FAS+A was offered, due to the lower DMI and not due to the acute effect of amines. However, in the sheep unadapted to FAS+A, amine content in the rumen was higher than when the sheep were adapted for 14 d to FAS+A or WAS. Adaptation to FAS+A and feeding WAS during the pre-periods, increased the amine-degrading capacity of rumen fluid. In conclusion, in sheep unadapted to dietary amines, feeding amines will acutely lower DMI through reduced palatibility and most probably by stressing intermediary metabolism. Being preconditioned to amines slightly reduces the acute effect on daily DMI. Although the sheep adapted within 14 d to biogenic amines in the diet and increased daily DMI, there was clear evidence that amines have a negative effect on palatability.
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Saha, Sayantani, i Moris S. Eisen. "Mild catalytic deoxygenation of amides promoted by thorium metallocene". Dalton Transactions 49, nr 36 (2020): 12835–41. http://dx.doi.org/10.1039/d0dt02770g.

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The organoactinide-catalyzed (Cp*2ThMe2) hydroborated reduction of a wide range of tertiary, secondary, and primary amides to the corresponding amines/amine–borane adducts via deoxygenation of the amides is reported herein.
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Yedage, Subhash L., Denvert S. D'silva i Bhalchandra M. Bhanage. "MnO2 catalyzed formylation of amines and transamidation of amides under solvent-free conditions". RSC Advances 5, nr 98 (2015): 80441–49. http://dx.doi.org/10.1039/c5ra13094h.

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Leggio, A., E. L. Belsito, G. De Luca, M. L. Di Gioia, V. Leotta, E. Romio, C. Siciliano i A. Liguori. "One-pot synthesis of amides from carboxylic acids activated using thionyl chloride". RSC Advances 6, nr 41 (2016): 34468–75. http://dx.doi.org/10.1039/c5ra24527c.

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Zhang, Qiao, Xiao-Tao Lin, Norihisa Fukaya, Tadahiro Fujitani, Kazuhiko Sato i Jun-Chul Choi. "Selective N-formylation/N-methylation of amines and N-formylation of amides and carbamates with carbon dioxide and hydrosilanes: promotion of the basic counter anions of the zinc catalyst". Green Chemistry 22, nr 23 (2020): 8414–22. http://dx.doi.org/10.1039/d0gc02890h.

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A Zn(OAc)2 catalyst bearing the 1,10-phenanthroline (phen) ligand was efficient in the N-formylation of organic amine derivatives (e.g., amines, amides, and carbamates) using carbon dioxide (CO2) and hydrosilanes.
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Charron, Carlie L., Jade M. Cottam Jones i Craig A. Hutton. "Are Aminomethyl Thioesters Viable Intermediates in Native Chemical Ligation Type Amide Bond Forming Reactions?" Australian Journal of Chemistry 71, nr 9 (2018): 697. http://dx.doi.org/10.1071/ch18198.

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The condensation of N-mercaptomethyl amines and thioesters is a potential route to amides, via aminomethyl thioester intermediates, in a native chemical ligation type process followed by self-cleavage of the ‘mercaptomethyl’ auxiliary. This paper describes investigations towards the preparation of aminomethyl thioesters, and subsequent conversion into amides, from a three-component coupling of formaldehyde, a thioacid, and an amine. Our studies suggest that while such intermediates may be formed en route to amides, no advantages are offered over the direct reaction of the amine and thioacid precursors.
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Yao, Lei, Ming-Yi Wang, Xin-Ke Wang, Yi-Jun Liu, Hang-Fei Chen, Jun Zheng, Wei Nie i in. "Detection of atmospheric gaseous amines and amides by a high-resolution time-of-flight chemical ionization mass spectrometer with protonated ethanol reagent ions". Atmospheric Chemistry and Physics 16, nr 22 (23.11.2016): 14527–43. http://dx.doi.org/10.5194/acp-16-14527-2016.

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Abstract. Amines and amides are important atmospheric organic-nitrogen compounds but high time resolution, highly sensitive, and simultaneous ambient measurements of these species are rather sparse. Here, we present the development of a high-resolution time-of-flight chemical ionization mass spectrometer (HR-ToF-CIMS) method, utilizing protonated ethanol as reagent ions to simultaneously detect atmospheric gaseous amines (C1 to C6) and amides (C1 to C6). This method possesses sensitivities of 5.6–19.4 Hz pptv−1 for amines and 3.8–38.0 Hz pptv−1 for amides under total reagent ion signals of ∼ 0.32 MHz. Meanwhile, the detection limits were 0.10–0.50 pptv for amines and 0.29–1.95 pptv for amides at 3σ of the background signal for a 1 min integration time. Controlled characterization in the laboratory indicates that relative humidity has significant influences on the detection of amines and amides, whereas the presence of organics has no obvious effects. Ambient measurements of amines and amides utilizing this method were conducted from 25 July to 25 August 2015 in urban Shanghai, China. While the concentrations of amines ranged from a few parts per trillion by volume to hundreds of parts per trillion by volume, concentrations of amides varied from tens of parts per trillion by volume to a few parts per billion by volume. Among the C1- to C6-amines, the C2-amines were the dominant species with concentrations up to 130 pptv. For amides, the C3-amides (up to 8.7 ppb) were the most abundant species. The diurnal and backward trajectory analysis profiles of amides suggest that in addition to the secondary formation of amides in the atmosphere, industrial emissions could be important sources of amides in urban Shanghai. During the campaign, photo-oxidation of amines and amides might be a main loss pathway for them in daytime, and wet deposition was also an important sink.
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Rozprawy doktorskie na temat "Amines"

1

Sandford, Graham. "Some amine hydrofluorides and amines in organofluorine chemistry". Thesis, Durham University, 1991. http://etheses.dur.ac.uk/6209/.

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Kargina, Irina. "Topochemical reactions of amines and amides with titanium and vanadium oxychlorides". Thesis, University of Ottawa (Canada), 1995. http://hdl.handle.net/10393/10109.

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The intercalation of primary, secondary, tertiary, and aromatic amines into layered TiOCl have been investigated by a variety of methods. The intercalation reaction does not appear to be a redox process. A key step for intercalation of amines into host TiOCl is proposed to be a coordination via nitrogen lone electron pair to Ti$\sp{3+}$ metal centres. Subsequent substitution of the interlayer chloride ions of TiOCl by the amine molecules is strongly dependent on the properties of the organic compounds and their ability to form ammonium salts. Based on X-ray diffraction, fluorescence, elemental analysis and thermal analysis, a model for the interaction of amines with TiOCl is proposed. The intercalation of primary, secondary, and tertiary amides into TiOCl and VOCl have been studied. A redox intercalation process is ruled out by using variety of amides with a range of redox potentials. The proposed interaction of intercalated amides with the host is different from that of amines and may dominated by formation of hydrogen bonds between the amides protons and Cl ions of the host.
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Abrahamson, Michael J. "Development of an amine dehydrogenase". Diss., Georgia Institute of Technology, 2012. http://hdl.handle.net/1853/50138.

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Biocatalysts are increasingly prevalent in the large-scale synthesis of enantiomerically pure compounds. However, many sought-after reactions lack a suitable enzymatic production route. This work describes the development of a novel amine dehydrogenase through the application of directed evolution altering the substrate specificity of an existing leucine dehydrogenase scaffold. Eleven rounds of directed evolution completely altered the enzyme’s specificity and successfully created amination activity. The resulting amine dehydrogenase asymmetrically catalyzes methyl isobutyl ketone and free ammonia to 1, 3-dimethyl butyl amine. The enantioselectivity of the wild-type enzyme was maintained despite the drastic changes to the binding pocket and yielded (R)-1,3-DMBA with nearly complete conversion making it an attractive catalyst in the synthesis of chiral amines. This was the first example of a cofactor-dependent amine dehydrogenase capable of selectively synthesizing chiral amines from a prochiral ketone and free ammonia. Additionally, knowledge gained altering the specificity of the leucine dehydrogenase scaffold was applied to an analogous phenylalanine dehydrogenase scaffold allowing for rapid evolution of novel activity. A single mutational library resulted in a second amine dehydrogenase with enhanced activity toward significantly different substrates, while maintaining comparable conversion and enantioselectivity. These two scaffolds provide examples of the broad applicability of the identified mutations in creating amine dehydrogenase activity.
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4

Ghislieri, Diego. "Application of engineered amine oxidases for the synthesis of chiral amines". Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/application-of-engineered-amine-oxidases-for-the-synthesis-of-chiral-amines(de93d851-97f8-4422-8dc4-0f7402488021).html.

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The development of cost-effective and sustainable catalytic methods for the production of enantiomerically pure chiral amines is a key challenge facing the pharmaceutical and fine chemical industries. There is an increasing demand for broadly applicable synthetic methods which deliver the desired amine product in high yield and enantiomeric excess (e.e.). Previously we have described the development of variants of monoamine oxidase from Aspergillus niger (MAO-N) which are able to mediate the complete conversion of racemic amines to the corresponding enantiomerically pure products in a single step. In this thesis we report a panel of MAO-N variants (D5, D9 and D11) developed in our laboratory, which are able to mediate the deracemisation of primary, secondary and tertiary amines with broad structural features. In particular, we have synthesized and subjected to deracemisation a broad range of tetrahydroisoquinolines and tetrahydro-β-carbolines checking enantioselectivity and enantiopreference of our biocatalysts. A relation between lipophilicity of the substituents and enantiopreference of the enzyme has been identified. We have also engineered a new MAO-N variant (D11) with a greatly increased substrate scope and enhanced tolerance for bulky substrates. Application of this engineered biocatalyst is highlighted by the asymmetric synthesis of the generic drugs Solifenacin and Levocetirizine as well as a number of important classes of biologically active alkaloid natural products. We also report a novel MAO-N mediated asymmetric oxidative Pictet-Spengler approach to the synthesis of (R)-harmicine.Another challenge facing the chemist in the new millennium is the development of cleaner and more efficient chemical processes. To this aim the combination of two or more catalytic systems to complete a series of cascade reactions is considered particularly appealing. We have reported a concurrent redox cascade for the deracemisation of pyrrolidines and tetrahydroisoquinolines using our monoamine oxidase-N with a biotinylated Ir-complex within streptavidin (SAV). To achieve the final goal it is necessary to shield the metal inside a host to avoid the mutual inactivation of the two catalysts. We have also described the combination of MAO-N with berberine bridge enzyme (BBE) for the synthesis of berbines (tetrahydroprotoberberines), which represent a sub-class of tetrahydro-isoquinoline alkaloids found in various plants. This bi-enzymatic cascade allows the synthesis of these structures achieving a theoretical 100% yield instead of the 50% given by the kinetic resolution using BBE itself.
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Rofouei, Mohammad Kazem. "The preparation, characterisation and reactivity of derivatives of a novel sterically demanding amido ligand". Thesis, University of Sussex, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.361401.

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Johansen, Maren Teresa. "Degradation of Amines". Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for kjemi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-23201.

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In view of the rising amounts of greenhouse gases in the atmosphere, preventing CO2 emissions has become increasingly important. The combustion of fossil fuels for energy production and transportation is a large contributor to the problem. One of the ways to reduce the amounts of CO2 being released from combustion is carbon capture and storage (CCS). Post-combustion is the capturing method which has been deemed the easiest to apply to existing power plants in a short period of time. Absorption of CO2 by MEA is the most common method used in post-combustion carbon capture, but there are still many aspects of the process that are not fully understood. Understanding the absorption mechanisms will make it easier to make more economical and environmentally friendly choices in the future. In this thesis the oxidative degradation of monoethanolamine (MEA) has been studied using an open batch setup. The stability of MEA has been studied under different temperatures and concentrations of oxygen in the gas stream. These experiments give a matrix of experiments performed at 55, 65 and 75 °C, with oxygen concentrations of 6, 21, 50 and 98% in the gas stream. To monitor how well the experimental results could be trusted, the water balance was maintained throughout the experiments, and the pH was measured in the flasks capturing volatile degradation compounds.To get a detailed picture of the degradation, the weight percent of nitrogen and the CO2 concentration has been found in the end samples, and the alkalinity and MEA concentration was found for all the samples.11 known degradation compounds have been monitored for the different experiments, and the conditions these compounds are formed at have been compared with the suggested reaction mechanisms. 4 of the products were analyzed as anions using Ion chromatography (IC), and 7 secondary reaction products were analyzed as part of a degradation mix in LC-MS. The dependency of these compounds to temperature and oxygen conditions has been discussed. The primary degradation compounds seems to show a more direct correlation to oxygen flow or temperature, while the secondary degradation reaction shows a bigger variation of temperature and oxygen dependency relative to the conditions of the experiments. Various analytical methods for determination of the known compounds were used to determine the concentration of the degradation compounds in the experiments. The accuracy of these methods was investigated, and the results investigated for both LC-MS, GC-MS and IC-EC, showed large variations. Mixing experiments were performed to investigate the unknown mechanism of N-(2-hydroxyethyl) glycine.
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Heuson, Egon. "Recherche de nouvelles transaminases pour la synthèse d'amines chirales". Thesis, Clermont-Ferrand 2, 2015. http://www.theses.fr/2015CLF22659/document.

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Slatter, John Gregory. "Metabolism of tertiary arylaliphatic amines and formamides in rats". Thesis, University of British Columbia, 1987. http://hdl.handle.net/2429/29392.

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The metabolites of the basic tertiary arylaliphatic amine N,N,α-trimethyl-7-phenylbenzenepropanamine (RecipavrinR) from male Wistar rats were characterized by gas chromatography-mass spectrometry (GCMS). The work was undertaken in an attempt to determine the source of a novel metabolite, N-(1-methyl-3,3-diphenylpropyl) formamide. The formamide metabolite was isolated from the bile of recipavrin dosed rats only after hydrolysis with the enzyme β-glucuronidase, suggesting that it arose from a glucuronide conjugated precursor. Recipavrin was chosen for the study based on structural similarity to the narcotic analgesic methadone which was shown to give rise to a similar metabolite, 6-formamido-4,4-diphenyl-3-heptanone. The secondary formamide was not a plausible candidate for a β-glucuronidase liberated metabolite of recipavrin, suggesting that a labile aglycone was responsible for the GCMS observation of the formamide metabolite. Labile isomeric compounds, α-methyl-(N-methylene)-7-phenylbenzenepropanamine N-oxide, N-(α-methyl-7-phenylbenzenpropylidene) methylamine N-oxide, and 2-(4',4'-diphenyl-but-2'-yl) oxaziridine were synthesized as possible precursors of the formamide. N-hydroxy-a-methyl-7-phenylbenzenepropanamine, and N-hydroxy-N,α-dimethyl-7-phenylbenzenepropanamine were synthesized as candidates for labile β-glucuronidase liberated aglycone precursors of the nitrones. The biliary nonconjugated and conjugated metabolites of recipavrin were characterized in detail. In addition to the formamide, 15 different metabolites representing the N- dealkylation, oxidative deamination, N-oxidation and phenyl ring oxidation pathways were identified by GCMS. To determine if thermal decomposition of the methylene nitrone in the GC inlet was responsible for the GCMS observation of the formamide metabolite, liquid chromatography-mass spectrometry (LCMS) was used to show that the formamide and not the isomeric methylene nitrone was present in bile prior to GCMS analysis. Although the synthetic methylene nitrone was shown to degrade in the GC inlet to the formamide, the LCMS experiment ruled out the thermal generation of the biliary formamide from a nitrone precursor. The nonconjugated and conjugated metabolites of the recipavrin metabolite, norrecipavrin were characterized in detail by GCMS. Since the secondary formamide metabolite was observed in the β-glucuronidase hydrolyzed bile extract, norrecipavrin was implicated as an intermediate in the biotransformation of recipavrin to the formamide. The possibility of solvent mediated formylation or free radical oxidation of desalkyl metabolites to afford the formamides was ruled out. The methylene nitrone was shown to afford the formamide metabolite under simulated workup conditions. An alkali catalyzed Beckmann rearrangement of nitrone to amide was used to account for this transformation. The secondary hydroxylamine was shown to give rise to the methylene nitrone under simulated workup conditions. It was concluded that the oxidation of a β-glucuronidase liberated secondary hydroxylamine metabolite to the methylene nitrone followed by Beckmann rearrangement of the nitrone to the formamide was the probable source of the formamide observed by GCMS in extracts of bile from recipavrin dosed rats. The metabolism of N-methyl-N-(1-methyl-3,3- diphenylpropyl) formamide was investigated in detail to determine whether the carbinolamide, N-hydroxymethyl-N-(1-methyl-3,3-diphenylpropyl) formamide was involved in the genesis of the formamide metabolite of recipavrin. The above carbinolamide and N-(1-hydroxy-1-methyl-3,3-diphenylpropyl) formamide were identified by GCMS along with 16 other metabolites representing the metabolic pathways N-deformylation, N-dealkylation, N-oxidation and phenyl ring oxidation. The carbinolamides were not found in bile from recipavrin dosed rats, ruling out the possibility of a carbinolamide glucuronide precursor of the recipavrin formamide metabolite. This was the first report of the isolation of stable dealkylation intermediates of a high molecular weight formamide. The hepatotoxicity of the anticancer agent N-methyl formamide and the solvent dimethylformamide, suggests that the recipavrin formamides could also be metabolized to toxic carbinolamide or glutathione related metabolites.
Pharmaceutical Sciences, Faculty of
Graduate
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Li, Haiying. "A study on grafting poly(p-phenylene terephthalamide) with aliphatic amines and amides". Thesis, Georgia Institute of Technology, 1999. http://hdl.handle.net/1853/8594.

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Lizier, Thiago Mescoloto [UNESP]. "Análise de aminas aromáticas em amostras de interesse ambiental por cromatografia líquida de alta eficiência acoplada a detectores de arranjo de diodo, eletroquímico e espectrometria de massas: Thiago Mescoloto Lizier. -". Universidade Estadual Paulista (UNESP), 2014. http://hdl.handle.net/11449/110706.

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O presente trabalho investiga novos métodos analíticos para análise de aminas aromáticas selecionadas em virtude de suas proprideades toxicológicas e/ou mutagênicas em amostras de interesse ambiental usando técnicas cromatográficas com diversos detectores. Após otimização das condições cromatográficas as aminas aromáticas: 4,4'-oxidianilina, anilina, 2,4- diaminotoluidina, 4,4'-diaminobifenila, 4,4'-metileno-bis-(2-cloroanilina), 3,3'-diclorobenzidina, 2- aminonaftaleno, 2-metilanilina, 2-metoxianilina, 4,4'-diaminodifenilmetano, 2-cloro-4-nitroanilina, 4-aminobifenila, 2-metoxi-5-metilanilina, 3,3'-dimetoxibenzidina, 4-cloroanilina e 3,3'- diclorobenzidina apresentaram picos bem DEfinidos em fase móvel metanol/água 70:30 (v/v) e vazão de 0,8 ml min-1 classificadas como grupo I. As aminas 1,4-diaminobenzeno, 4,4'- metilbenzeno-1,4-diamina, p-aminofenol, N-monoacetil-1,4-diaminobenzeno, 2,5-dimetilanilina, 4,4'-metileno-bis-2-metilanilina e 4-cloro-2-metilanilina foram agrupadas no grupo II, melhor separadas em fase móvel acetonitrila/água 60:40 (v/v), vazão 0,8 ml min-1 e T= 40 C. A comparação entre os detectores de arranjo de diodos (DAD) e eletroquímico (ED) foram conduzidos nestas condições otimizadas e curvas analíticas lineares foram construídas para todas estas aminas entre 1 a 250 mg L-1 (detector DAD = 230 nm) e 0,5 a 250 mg L-1 (detector ED - Ep = +1,0V)), utilizando para isto a adição de 30 x 10-3 Mol L-1 do líquido iônico BMIm-NTf2 (1-butil-3-metilimidazólio de bis(trifluorometilsulfonil)imida). A adição do líquido iônico promoveu melhor separação e aumento na intensidade dos picos cromatográficos em ambos os detectores. O limite de detecção das aminas por HPLC-DAD e HPLC-ED mostraram valores entre 1,27 a 10,2 mg L-1 e 1,33 a 6,04 mg L-1, respectivamente. O limite de quantificação das aminas por HPLC-DAD e HPLC-ED mostraram valores entre 4,24 a 34,0 mg L-1 e 4,44 a 20,1 mg L-1, ...
This work investigates new analytical methods for analysis of aromatic amines selected because of their toxicological and/or mutagenic properties in samples of environmental interest using chromatographic techniques with various detectors. After optimization of chromatographic conditions as aromatic amines: 4,4'-oxydianiline, aniline, 2,4-diaminotoluidina, 4,4'- diaminobifenila, 4,4'-methylenebis-(2-chloroaniline), 3,3'-dichlorobenzidine, 2- aminonaphthalene, 2-methylaniline, 2-methoxyaniline, 4,4'-diaminodiphenylmethame, 2-chloro- 4-nitroaniline, 4-aminobifenila, 2-methoxy-5-methylaniline, 3,3'-dimethoxybenzidine, 4- chloroaniline and 3,3'-dichlorobenzidine showed well defined peaks in the mobile phase methanol/water 70:30 (v/v) and a flow rate of 0.8 mL min-1 classified as group I. The amines 1,4- diaminobenzene, 4,4'-methylbenzene-1,4-diamine, p-aminophenol, N-monoacethyl-1,4- diaminobenzene, 2,5-dimethylaniline, 4,4'-methylene-bis-2-methylaniline and 4-chloro-2- methylaniline were grouped in group II, best separated in the mobile phase acetonitrile/water 60:40 (v/v), flow rate 0.8 mL min-1 and T = 40°C. The comparison between the diode array detector (DAD) and electrochemical (ED) were conducted on these optimized conditions, linear calibration curves were constructed for all these amines from 1 to 250 mg L-1 (DAD detector = 230 nm) and 0.5 to 250 mg L-1 (detector ED - Ep = +1.0 V), using for this purpose the addition of 30 x 10-3 mol L-1 of BMIm-NTf2 ionic liquid (1-butyl-3-methylimidazolium-bis- (trifluoromethylsulfonyl)imide). The addition of ionic liquid promoted better separation and increase in the intensity of the chromatographic peaks in both detectors. The HPLC-DAD and HPLC-ED detection limit of the amines showed values between 1.27 to 10.2 mg L-1 and 1.33 to 6.04 mg L-1, respectively. The HPLC-DAD and HPLC-ED limit of quantification of the amines showed values between 4.24 to 34.0 mg L-1 and from 4.44 to 20.1 mg L-1,...
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Książki na temat "Amines"

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L, Hayes Teresa, Richardson Michael B, Friedman Rebecca L i Freedonia Group, red. Amines. Cleveland: Freedonia Group, 2000.

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G, Baumgartner William, red. Amines. Cleveland: Freedonia Group, 1998.

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Boulton, A. A., A. V. Juorio i R. G. H. Downer, red. Trace Amines. Totowa, NJ: Humana Press, 1988. http://dx.doi.org/10.1007/978-1-4612-4602-2.

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Kagakkai, Nihon Bunseki. Aminosan, seitai amin bunseki. Tōkyō: Maruzen Shuppan, 2012.

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Boulton, Alan A., Glen B. Baker i Judith M. Baker. Amines and Their Metabolites. New Jersey: Humana Press, 1985. http://dx.doi.org/10.1385/0896030768.

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Li, Wei, i Xumu Zhang, red. Stereoselective Formation of Amines. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-53929-9.

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Saad, Bahruddin, i Rosanna Tofalo, red. Biogenic Amines in Food. Cambridge: Royal Society of Chemistry, 2019. http://dx.doi.org/10.1039/9781788015813.

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Amines and ammonium salts. Stuttgart: Thieme, 2009.

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A, Boulton A., Baker Glen B. 1947- i Baker Judith M, red. Amines and their metabolites. Clifton, N.J: Humana Press, 1985.

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Follain, Nadege. Amines grafted cellulose materials. New York: Nova Science Publishers, 2010.

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Części książek na temat "Amines"

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Börnick, Hilmar, i Torsten C. Schmidt. "Amines". W Organic Pollutants in the Water Cycle, 181–209. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/352760877x.ch8.

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Gooch, Jan W. "Amines". W Encyclopedic Dictionary of Polymers, 35. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_555.

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Tucker, William B. "Amines". W Organic Chemistry, 277–87. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003479352-23.

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Sourkes, T. L. "Copper, Biogenic Amines, and Amine Oxidases". W Novartis Foundation Symposia, 143–61. Chichester, UK: John Wiley & Sons, Ltd., 2008. http://dx.doi.org/10.1002/9780470720622.ch8.

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Yon, A. Marjorie, B. Jean-Daniel Marty i C. Diana Ciuculescu-Pradines. "CHAPTER 6. Amines and Amine-boranes". W Reducing Agents in Colloidal Nanoparticle Synthesis, 130–56. Cambridge: Royal Society of Chemistry, 2021. http://dx.doi.org/10.1039/9781839163623-00130.

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Khan, JaVed I., Thomas J. Kennedy i Donnell R. Christian. "Tertiary Amines". W Basic Principles of Forensic Chemistry, 177–90. Totowa, NJ: Humana Press, 2011. http://dx.doi.org/10.1007/978-1-59745-437-7_14.

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Sahar, Amna, Ubaid ur Rahman, Muhammad Issa Khan i Muhammad Azam Khan. "Heterocyclic Amines". W Food Safety, 89–111. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39253-0_5.

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Turiault, Marc, Caroline Cohen, Guy Griebel, David E. Nichols, Britta Hahn, Gary Remington, Ronald F. Mucha i in. "Trace Amines". W Encyclopedia of Psychopharmacology, 1325–29. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-68706-1_211.

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Tyrer, Peter J., Mark Slifstein, Joris C. Verster, Kim Fromme, Amee B. Patel, Britta Hahn, Christer Allgulander i in. "Biogenic Amines". W Encyclopedia of Psychopharmacology, 227. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-540-68706-1_598.

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Tomlinson, Sara, Darrell D. Mousseau, Glen B. Baker i Ashley D. Radomski. "Trace Amines". W Encyclopedia of Psychopharmacology, 1723–28. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-36172-2_211.

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Streszczenia konferencji na temat "Amines"

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Khramov, Dimitri, Balakrishnan Panamarathupalayam i Evgeny Barmatov. "Demystifying Amine Inhibitor Chemistry". W SPE International Conference on Oilfield Chemistry. SPE, 2023. http://dx.doi.org/10.2118/213797-ms.

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Abstract Amine shale inhibitors are an integral part of high-performance water based mud (HP WBM). There are many commercially available amines with similar claims regarding performance as shale inhibitors. Most performance comparisons are made relative to KCl-polymer muds, making the shale inhibitor differences very apparent. Unfortunately, a comparison between several good-performing inhibitors is rarely performed and reported. There are few systematic comparisons of amine shale inhibitors with each other based on their structure and conditions under which testing is performed. The relationship between amine structure and performance as an inhibitor is not well understood. This paper presents design of an experimental methodology to compare the effectiveness of 30+ amines as shale inhibitors under a broad range of testing conditions. Shale hydration, dispersion, and bulk hardness were measured after exposure to drilling fluids to determine which test parameter can most efficiently distinguish amines. Additionally, the adsorption or desorption of amines from a clay were measured to determine which amine is the strongest absorber. Statistical data treatment was applied to separate signal from the noise of measurements. The results of this investigation verified that amine inhibitors do not affect shale moisture content and shale dispersion is primarily affected by fluid viscosity. Furthermore, a bulk hardness test that measures cuttings hardness is a good differentiator of amine inhibitors. Supplementary functioning for amine inhibitors was confirmed with adsorption or desorption test that showed good correlation with a bulk hardness test. In summary, these measurements established a structure-activity relationship between the amines tested and determined that an effective shale inhibitor should contain more than 1 nitrogen atom/molecule. Additionally, linear structure is preferred over branched structure, and supplementary hydrophobic amines function better than hydrophilic amines provided the amine remains water soluble. Amines were further differentiated by their acid-base dissociation constant (pKa). The reason some amines perform in broader pH range than others is also presented. For the first time, a statistically validated study has been conducted to assess the results of different tests and to compare the effectiveness of different shale inhibitors. The results of these comparisons provided a way to understand the shale inhibition mechanism and develop better practices focused on developing next-generation aqueous fluid systems.
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Frizzo, Clarissa, Dionisia Sanz, José Elguero i Rosa Claramunt. "Biotinylated Primary Amines". W The 14th International Electronic Conference on Synthetic Organic Chemistry. Basel, Switzerland: MDPI, 2010. http://dx.doi.org/10.3390/ecsoc-14-00404.

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DiFlavio, John-Louis, Robert Bertoia, Robert Pelton i Marc Leduc. "The Mechanism of Polyvinylamine Wet-strengthening". W Advances in Paper Science and Technology, redaktor S. J. I’Anson. Fundamental Research Committee (FRC), Manchester, 2005. http://dx.doi.org/10.15376/frc.2005.2.1293.

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Regenerated cellulose films were laminated with polyvinylamine, PVAm, and the wet peel delamination forces were used to explore the mechanism by which PVAm increases the wet strength of paper. Conventional wet strength resins contain highly reactive chemical groups which can crosslink the resin and graft it to fibre surfaces. By contrast, it is not obvious how PVAm provides wet strength. The delamination experiments revealed that PVAm gives strong adhesion which was approximately independent of drying temperature (23 to 110°C), pH 3 to 9, PVAm molecular weight (34,000 to 1,500,000Da), and PVAm coverage (monolayer to 70mg/m2 ). By contrast the adhesion increased with the amine content of PVAm and with the degree of oxidation of the cellulose films. It is proposed that the PVAm adhesion is a combination of electrostatic and covalent bonding. The electrostatic bonding is between protonated amines, which are positively charged, and carboxyl groups on the cellulose. Whereas the covalent bonds, aminal and imine linkages, are formed between amines and aldehyde groups on the oxidized films.
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Manabe, S., H. Yanagisawa, S. Ishikawa, Y. Kitagawa, K. Tohyama, S. Abe i O. Wada. "TRYPTOPHAN PYROLYSIS PRODUCTS FOUND IN COOKED FOODS INHIBIT HUMAN PLATELET AGGREGATION BY INHIBITING CYCLOOXYGENASE". W XIth International Congress on Thrombosis and Haemostasis. Schattauer GmbH, 1987. http://dx.doi.org/10.1055/s-0038-1643402.

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Humans are exposed to numerous toxic compounds in foods. During the past decade, several carcinogenic heterocyclic amines have been reported to be present in the cooked foods. Recently, we reported that some of the carcinogenic heterocyclic amines isolated from foods were present in human plasma. In order to know the effects of the carcinogens isolated from foods on the cell function, we investigated the effects of the carcinogenic heterocyclic amines including Trp-P-1(3-amino-l,4-dimethyl-5H-pyrido❘4,3-b❘indole) and Trp-P-2(3-amino-1-methyl-5H-pyrido❘4,3-b❘indole) on human platelet aggregation and polymorphonuclear leukocyte aggregation. Only tryptophan pyrolysis products, Trp-P-1 and Trp-P-2, had potent inhibitory effects on human platelet aggregation when platelets were preincubated with the carcinogens for 15 min. Other carcinogenic heterocyclic amines such as glutamic acid pyrolysates (Glu-P-1 and Glu-P-2) and 3H-imidazo ❘4,5-f❘quinoline-2-amines(IQ and MelQ) did show no effect on platelet aggregation even at 100 μM.The autoradiogram demonstrated that Tryptophan pyrolysis products, Trp-P-1 and Trp-P-2, dose-dependently inhibited the formation of HHT,PGD2,PGE2 and TXB2 induced by sodium arachidonate in human platelets labeled with ❘ 14c❘ arachidonic acid. Moreover, Trp-P-1 and Trp-P-2 did not show significant effects on leukocyte aggregation induced by sodium arachidonate (0.75mM) even at lOOnM. It is concluded that Trp-P-1 and Trp-P-2 isolated from cooked foodstuffs have potent inhibitory effects on the cyclo-oxygenase pathway of the platelet. Therefore, human platelet function might be affected with daily foods containing tryptophan pyrolysis products in vivo.
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Abbo, Hanna, Marvin Piet, Salam Titinchi, Wilhelm Schwieger i Olav Bolland. "Amino-Functionalized Silica Materials for Carbon Dioxide Capture". W ASME 2015 9th International Conference on Energy Sustainability collocated with the ASME 2015 Power Conference, the ASME 2015 13th International Conference on Fuel Cell Science, Engineering and Technology, and the ASME 2015 Nuclear Forum. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/es2015-49743.

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Amine-functionalized mesoporous silica has attracted much attention as a promising chemical sorbent for capturing carbon dioxide. It has the combination of several features viz., high adsorption capacity, high selectivity toward CO2, fast kinetics, mild conditions for desorption and should be stable under operating conditions. In this study, a chemical grafting route has been developed to synthesize mesoporous adsorbents with amines functionalization for CO2 capture. The initial silylation step was achieved by grafting of different silane linkers (3-aminopropyl)-trimethoxysilane (APS) and 3-chloropropyl)-trimethoxysilane (CPS) via direct condensation and hydrolysis reaction. After silylation the CPS-supports was reacted with tris(2-aminoethyl)amine (TREN) to introduce the amine group to increase the adsorptive capabilities for these sorbents. The synthesized sorbents were characterized by N2 adsorption/desorption, XRD, FTIR and HR-SEM. The adsorption capacities of the modified solid sorbents show a significant enhancement in their adsorption capacity by 3–4 times higher than that of the parent materials which indicate the affirmative impact of amines for CO2 adsorption after grafting.
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Kinaci, Emre, Giuseppe Palmese, Joseph Stanzione i Sarah Salazar. "Evaluation of hybridized bio-based building blocks as coating materials". W 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/oyjf3899.

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Commercial epoxy resins are often the oligomeric reaction products of bisphenol A (BPA) with epichlorohydrin. BPA is a toxic petrochemical and a well-known endocrine disruptor which can mimic the body’s own hormones and may lead to several negative health effects. The most common curing agents are also the derivatives of toxic amines such as aniline, ethylene di-amine, and ammonia etc. which are under strict regulations and restrictions by TSCA and (REACH) agencies. Therefore; there is a growing demand to develop epoxy and amine systems from non- or less- toxic and annually renewable precursors derived from bio-mass to replace depleting petrochemicals. Within this context, cardanol molecule is combined with vanillyl alcohol through electrophilic substitution reaction to synthesize a bis-phenol type resin (VAC). Di-glycidyl ether of the VAC (EVAC) is mixed with di-glycidyl ether of bisphenol A (DGEBA) at varying ratios and cured with di-furan di-amine (DFDA) which is previously a well-studied bio-based diamine derived from furfurylamine. Thermally cured blends demonstrated improved modulus and char yields relative to aliphatic and cyloaliphatic amines due the furanic nature of DFDA as demonstrated via thermo-physical and mechanical tests. Although, the replacement of EVAC with DGEBA resulted in a reduction in glass transition temperature (Tg) and the modulus of the network, desired flexibility and toughness for coatings applications were imparted due to the aliphatic nature of the cardanol molecule. In addition, rheological studies demonstrated improved gel time and lower viscosity with increasing EVAC content along with improved vapor barrier properties. These bio-derived epoxy-amine formulations demonstrated promising performance to completely or partially replace the BPA and other toxic amines in the thermoset networks for surface coating applications.
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Lu, Dong, Alastair Trigg, Zhenxiang Xing, Rakesh Kumar i Chang Kuo Chang. "Application of ToF-SIMS to Airborne Organic Contamination Analysis". W ISTFA 2003. ASM International, 2003. http://dx.doi.org/10.31399/asm.cp.istfa2003p0215.

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Abstract Airborne molecular contamination poses a serious problem for advanced wafer fabrication as the devices are continually scaled down. The amount of this contamination may be only a few monolayers, which are extremely difficult to detect by the commonly used analytical techniques, such as FTIR. ToF-SIMS has extremely high surface sensitivity for the analysis of trace contaminants on wafer surfaces. The high mass resolution of ToF-SIMS is also a powerful tool for the identification of the contaminants. In the current study, ToF-SIMS is used to monitor the build-up of airborne amine contamination on Black Diamond1 surfaces. It has been found that cleaning of the Black Diamond surfaces using wet chemicals can lead to photoresist poisoning. Thermal desorption-GC-MS analysis revealed that wet cleaning would result in the accumulation of hydrocarbons on the Black Diamond surfaces. ToF-SIMS shows that amines can build up gradually on the Black Diamond surfaces after wet cleaning, probably via airborne molecular contamination. For the Black Diamond wafers which did not go through the wet cleaning process, there was no significant increase of amines on the wafer surfaces. The amount of amines on the Black Diamond surfaces depends on the chemicals used in the cleaning processes and the wafer storage conditions. The level of amine contamination can be significantly reduced after the samples are heated up to 300°C for a few minutes in inert atmosphere.
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Vazquez, O., T. Chen, L. Crombie, P. Chen, S. Heath i Q. Guo. "The Impact of Pre-flush Additives on Scale Squeeze Treatments - Application of Modelling and New Test Methodologies to Understand Mechanisms of Retention and Optimise Field Treatment Designs". W SPE International Oilfield Scale Conference and Exhibition. SPE, 2014. http://dx.doi.org/10.2118/spe-169800-ms.

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Abstract One of the most common methods to prevent scale deposition in the near wellbore area is through the application of squeeze treatments which conventionally consist of pre-flush, main treatment, overflush, shut-in and back production stages. The use of additives such as polyamino acids and polyquaternary amines has often been successfully applied as part of the pre-flush stage of squeeze treatments to improve treatment lifetimes (Chen et al., 2006, Vazquez et al., 2011, Heat et al., 2012). However, although this technology has been successful applied in the field, there is still a lack of understanding of the prevalent retention mechanisms with different scale inhibitors and also a suitable test methodology and modelling techniques to optimize field treatment designs and lifetimes. A new sand pack methodology which provides a better simulation of field squeeze treatments than traditional corefloods has been designed to provide a better understanding of the scale inhibitor retention mechanisms when polyquaternary amines are applied in pre-flush treatments. This has enabled improved treatment modelling and the impact of these additives to be understood in field treatments. The performance of the polyquaternary amine is dependent upon scale inhibitor chemistry and the mechanisms of retention are addressed for both polymeric and phosphonate scale inhibitors. The adsorption isotherms were derived and compared in the absence/presence of the polyquaternary amine using specialized software, and applied to predict squeeze lifetime in field scenarios. This paper provides an understanding on the effects of polyquaternary amines on squeeze lifetime for both phosphonate and polymeric scale inhibitors supported by the application of a newly developed test methodology and computer modelling techniques. In addition, the combination of laboratory and computer modelling data coupled with field experience and a better understanding of the retention mechanisms involved now provides the ability to improve and optimize field squeeze treatment designs with polyquaternary amine pre-flush additives.
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Kim, Hoon Sik, Minjeong Kim i Minserk Cheong. "Functionalized Tertiary Amines as SO2 Absorbents". W The World Congress on Civil, Structural, and Environmental Engineering. Avestia Publishing, 2016. http://dx.doi.org/10.11159/icesdp16.112.

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Epure, Petru, Ana-Maria Gurban i Lucian-Gabriel Zamfir. "Practical Aspects of Biogenic Amines Detection". W Priochem 2023. Basel Switzerland: MDPI, 2023. http://dx.doi.org/10.3390/chemproc2023013024.

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Raporty organizacyjne na temat "Amines"

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Selig, W. Determination of equivalent weight of amines. Office of Scientific and Technical Information (OSTI), styczeń 1987. http://dx.doi.org/10.2172/6881693.

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Thomson, J. S., J. B. Green, T. B. McWilliams i S. K. T. Yu. GC/MS determination of amines following exhaustive trifluoroacetylation. Office of Scientific and Technical Information (OSTI), sierpień 1993. http://dx.doi.org/10.2172/10180988.

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Hameka, Hendrik F., George R. Famini, James O. Jensen i E. I. Newhouse. Computations of Vibrational Infrared Frequencies of Selected Amines. Fort Belvoir, VA: Defense Technical Information Center, styczeń 1990. http://dx.doi.org/10.21236/ada218840.

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Mossine, Valerie V. Multivalent Lactulose-amines as Inhibitors of Prostate Cancer Metastasis. Fort Belvoir, VA: Defense Technical Information Center, marzec 2002. http://dx.doi.org/10.21236/ada406249.

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Hameka, H. F., G. R. Famini, J. O. Jensen i J. L. Jensen. Theoretical Prediction of Vibrational Infrared Frequencies of Tertiary Amines. Fort Belvoir, VA: Defense Technical Information Center, luty 1991. http://dx.doi.org/10.21236/ada232880.

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Overly, Joyce, i Deanne Snavely. Vibrational Overtone Spectroscopy of Cyclic Amines: Pyridine and Related Compounds. Fort Belvoir, VA: Defense Technical Information Center, maj 1993. http://dx.doi.org/10.21236/ada265524.

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Adams, R. The transformation of organic amines by transition metal cluster compounds. Office of Scientific and Technical Information (OSTI), luty 1990. http://dx.doi.org/10.2172/7108222.

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Frechet, Jean M., i James F. Cameron. Photogenerated Amines and Diamines: Novel Curing Systems for Thin Film Coatings. Fort Belvoir, VA: Defense Technical Information Center, maj 1991. http://dx.doi.org/10.21236/ada235568.

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Adams, R. D. The transformation of organic amines by transition metal cluster compounds: Progress report. Office of Scientific and Technical Information (OSTI), listopad 1994. http://dx.doi.org/10.2172/10105409.

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Rosen, R. K. Reaction of Tris(cyclopentadienyl)uranium compounds with amines, azides, and related ligands. Office of Scientific and Technical Information (OSTI), grudzień 1989. http://dx.doi.org/10.2172/7257519.

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