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Thematische Bibliographien / Imine acids

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Auswahl der wissenschaftlichen Literatur zum Thema „Imine acids“

Autor: Grafiati

Veröffentlicht am 18. Mai 2024

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Zeitschriftenartikel zum Thema "Imine acids"

1

Zarei, Maaroof. „One-step Synthesis of β-lactams Using Cyanuric Fluoride“. Journal of Chemical Research 37, Nr. 1 (Januar 2013): 25–27. http://dx.doi.org/10.3184/174751912x13545429290478.

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Cyanuric fluoride works as an efficient acid activator reagent for the direct [2+2] ketene–imine cycloaddition of substituted acetic acids and imines in a one-pot synthesis under mild conditions. The yields are good to excellent and the reaction conditions are mild, simple and efficient.

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Wulff, William, Xin Zhang und Yijing Dai. „The Acceleration of the Rearrangement of α-Hydroxy Aldimines by Lewis or Brønsted Acids“. Synlett 29, Nr. 15 (28.08.2018): 2015–18. http://dx.doi.org/10.1055/s-0037-1610262.

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An efficient method was developed for the synthesis of α-amino ketones from α-hydroxy imines. The reaction occurs through an α-iminol rearrangement involving the migration of a substituent of the carbinol carbon to the imine carbon. The optimal catalysts were found to be silica gel or montmorillonite K 10, which effected migration of a variety of aryl and alkyl substituents in high yields. The rearrangement can also be carried out on imines generated in situ from aldehydes and amines in essentially the same yields as those from the preformed imines.

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3

Sikervar, Vikas, Ravindra Sonawane, Raghuramaiah Mandadapu, Amol Satish Dehade, Shrikant Abhiman Shete und Mark Montgomery. „Lewis Acid Mediated [3+2] and [3+3] Annulations of an Azomethine Imine with Donor–Acceptor Cyclopropanes“. Synthesis 53, Nr. 16 (10.05.2021): 2865–73. http://dx.doi.org/10.1055/a-1503-8068.

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AbstractTwo different Lewis acids were used for developing [3+2] and [3+3] regioselective cycloaddition reactions of an azomethine imine with activated cyclopropanes. Scandium(III) triflate catalyzes a [3+2] cycloaddition reaction of the azomethine imine with cyclopropanes to form tetrahydropyrazolone derivatives and tricyclic tetrahydrofuran derivatives in moderate yields. Complementary to this, a novel [3+3] cycloaddition reaction of the azomethine imine with activated cyclopropanes was developed by using EtAlCl2 as a Lewis acid to form hexahydropyridazinone derivatives in high regioselectivity.

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4

Morales Salazar, Daniel, Arvind Kumar Gupta und Andreas Orthaber. „Reactivity studies of an imine-functionalised phosphaalkene; unusual electrostatic and supramolecular stabilisation of a σ2λ3-phosphorus motif via hydrogen bonding“. Dalton Transactions 47, Nr. 31 (2018): 10404–9. http://dx.doi.org/10.1039/c8dt01607k.

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5

Alex, S., P. Turcotte, R. Fournier und D. Vocelle. „Study of the protonation of simple Schiff bases in solvents of various polarity by means of Raman spectroscopy“. Canadian Journal of Chemistry 69, Nr. 2 (01.02.1991): 239–45. http://dx.doi.org/10.1139/v91-038.

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In this study, the protonation of simple Schiff bases by organic acids in various solvents is investigated by Raman spectroscopy and the spectral response of the C=N+ stretching mode is correlated with the macroscopic properties of the medium surrounding the imine. Upon protonation, the unperturbed C=N stretch increases in frequency due to the combination of the coupling with the C=N+H bend and a partial rehybridization of the C=N bond. Depending on the proton location relative to that of its counterion, one mechanism may prevail over the other. Intensity measurements show that protonation is mostly controlled by the hydrogen bonding properties of the solvent and by the polarity of the medium. However, whatever the solvent, full proton transfer cannot be achieved with organic acids with pKa similar to the COOH of amino acids found in visual or bacterial pigments, meaning that the protonation mechanism may depend upon particular properties of the protein. Key words: imines, protonation, Raman spectroscopy, rhodopsin, Schiff base.

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6

Wang, Hao-Ran, En-He Huang, Chen Luo, Wen-Feng Luo, Yin Xu, Peng-Cheng Qian, Jin-Mei Zhou und Long-Wu Ye. „Copper-catalyzed tandem cis-carbometallation/cyclization of imine-ynamides with arylboronic acids“. Chemical Communications 56, Nr. 35 (2020): 4832–35. http://dx.doi.org/10.1039/d0cc01424a.

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An efficient copper-catalyzed regioselective cis-carbometallation/cyclization of imine-ynamides with arylboronic acids enables the facile and practical synthesis of valuable 2,3-disubstituted indolines.

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7

Bissonnette, Martine, Hoa Le Thanh und Daniel Vocelle. „Interaction of strong acids with a conjugated imine“. Canadian Journal of Chemistry 63, Nr. 8 (01.08.1985): 2298–302. http://dx.doi.org/10.1139/v85-379.

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The state of protonation of a Schiff base, trans-trans-heptadienylidene tert-butylamine (HBA) was evaluated by uv and 1H nmr spectroscopies. Using three strong acids, HCl, HBr, HI and by taking spectra at low temperatures, it was found that in a non-polar solvent like chloroform (or CDCl3), no proton exchange occurred between the iminium ion and the halide anion. In contrast, CD3OH induced a leveling effect and some proton transfer occurred between the iminium ion and the solvent for the HBr and HI salts. No proton exchange was present for the HBA:HCl salt. The interaction of trichloroacetic acid with HBA was also studied: full proton exchange occurred between the iminium ion and CD3OH. In CDCl3, proton transfer was also present between the iminium ion and the carboxylate anion. These facts are discussed in relation with the controversy surrounding the true state of protonation of rhodopsin.

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8

Bakulina, Olga, Alexander Ivanov, Vitalii Suslonov, Dmitry Dar’in und Mikhail Krasavin. „A speedy route to sterically encumbered, benzene-fused derivatives of privileged, naturally occurring hexahydropyrrolo[1,2-b]isoquinoline“. Beilstein Journal of Organic Chemistry 13 (18.07.2017): 1413–24. http://dx.doi.org/10.3762/bjoc.13.138.

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A series of 15 benzene-fused hexahydropyrrolo[1,2-b]isoquinolonic acids with substantial degree of steric encumbrance has been prepared via a novel variant of the Castagnoli–Cushman reaction of homophthalic anhydride (HPA) and various indolenines. The employment of a special kind of a cyclic imine component reaction allowed, for the first time, isolating a Mannich-type adduct between HPA and an imine component which has been postulated but never obtained in similar reactions.

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9

Zaccheria, Federica, Federica Santoro, Elvina Iftitah und Nicoletta Ravasio. „Brønsted and Lewis Solid Acid Catalysts in the Valorization of Citronellal“. Catalysts 8, Nr. 10 (22.09.2018): 410. http://dx.doi.org/10.3390/catal8100410.

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Terpenes are valuable starting materials for the synthesis of molecules that are of interest to the flavor, fragrance, and pharmaceutical industries. However, most processes involve the use of mineral acids or homogeneous Lewis acid catalysts. Here, we report results obtained in the liquid-phase reaction of citronellal with anilines under heterogeneous catalysis conditions to give tricyclic compounds with interesting pharmacological activity. The terpenic aldehyde could be converted into octahydroacridines with a 92% yield through an intramolecular imino Diels–Alder reaction of the imine initially formed in the presence of an acidic clay such as Montmorillonite KSF. Selectivity to the desired product strongly depended on the acid sites distribution, with Brønsted acids favoring selectivity to octahydroacridine and formation of the cis isomer. Pure Lewis acids such as silica–alumina with a very low amount of alumina gave excellent results with electron-rich anilines like toluidine and p-anisidine. This protocol can be applied starting directly from essential oils such as kaffir lime oil, which has a high citronellal content.

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Ahmad, Rasool, Rizwan, Altaf, Rashid, Mahmood und Ayub. „Role of Pyridine Nitrogen in Palladium-Catalyzed Imine Hydrolysis: A Case Study of (E)-1-(3-bromothiophen-2-yl)-N-(4-methylpyridin-2-yl)methanimine“. Molecules 24, Nr. 14 (17.07.2019): 2609. http://dx.doi.org/10.3390/molecules24142609.

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In the present study, 4-methylpyridin-2-amine was reacted with 3-bromothiophene-2-carbaldehyde and the Schiff base (E)-1-(3-bromothiophen-2-yl)-N-(4-methylpyridin-2-yl)methanimine was obtained in a 79% yield. Coupling of the Schiff base with aryl/het-aryl boronic acids under Suzuki coupling reaction conditions, using Pd(PPh3)4 as catalyst, yielded products with the hydrolysis of the imine linkages (5a–5k, 6a–6h) in good to moderate yields. To gain mechanistic insight into the transition metal-catalyzed hydrolysis of the compounds, density functional theory (DFT) calculations were performed. The theoretical calculations strongly supported the experiment and provided an insight into the transition metal-catalyzed hydrolysis of imines.

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Dissertationen zum Thema "Imine acids"

1

Saha, Manik Chandra. „Physico-chemical studies on coordination compounds of imine acids with dioxouranium (VI) and trivalent lanthanide ions“. Thesis, University of North Bengal, 1988. http://hdl.handle.net/123456789/764.

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2

Evans, Caroline. „A novel methodology for the asymmetric synthesis of beta-lactams and beta-amino acids“. Thesis, University of Bath, 2012. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.558881.

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3

Baskakova, Alevtina. „Synthesis of branched [alpha]-[alpha-] and [beta]-amino[beta-amino] acids using C-nucleophile additions to imines and nitrones“. Berlin Logos-Verl, 2009. http://d-nb.info/99789301X/04.

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4

Garbay, Guillaume. „Nouvelles voies de synthèse sans métaux d'oligomères et de polymères π-conjugués pour l'électronique organique“. Thesis, Bordeaux, 2016. http://www.theses.fr/2016BORD0240/document.

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Dans cette thèse sont développées les synthèses et caractérisations de nouveaux polymères conjugués pour des applications dans l’électronique organique. Ces polymères ont été synthétisés via des réactions de polymérisation sans utilisation de métaux de transition. Des polyazomethines à base de carbazole ont ainsi été synthétisés par polycondensation entre des carbazole portant des fonctions amine et aldéhyde en positions 2,7 et 3,6. Leurs propriétés optiques et électroniques ont été étudiées en fonction de la position des fonctions imines ainsi formées. Un comonomère de type EDOT a ensuite été intégré dans le polymère et l’impact de ce comonomère sur les propriétés du copolymère ainsi formé a été étudié.Des polymères à base d’acide squarique et croconique ont ensuite été synthétisés. En faisant varierles conditions de synthèse, les propriétés optoélectroniques ont pu être contrôlées, permettant d’obtenir des composés présentant une émission blanche, qui ont ensuite été intégrés en tant que couche active dans des dispositifs de type OLED.Enfin, des polymères plus originaux ont été étudiés, utilisant des réactions de polymérisation originale, permettant par exemple la formation de benzobisthiazole in situ. D’autres polymères ont été synthétisés en intégrant dans leur chaine des monomères originaux, comme la tetrazine ou la divanilline. Les propriétés optoélectroniques de ces composés ont ensuite été étudiées en vue deleur éventuelle intégration dans des dispositifs
In this work, synthesis and characterizations of new conjugated polymers are described.These polymers, developed for their integration into devices, have been synthesized via transitionmetalfree polymerizations. Carbazole based polyazomethines have been synthesized via polycondensation reactions between di-substituted carbazoles, bearing amino and formyl functionsin positions 3,6 or 2,7. Optical and electronical properties of such polymers have been studieddepending of the linkage position. A comonomer EDOT has then been integrated into the polymer chain, and impact of such insertion has been studied. Squaric and croconic acid base polymers have also been synthesized. By varying polymerization conditions, optoelectronic properties have been tuned, leading to the formation of polymers exhibiting a white emission. These polymers have then been integrated into OLED, as the active layer. Finally, more original polymers have been synthesized, using more original reactions or monomers such as by forming in situ benzobisthiazole. Other polymers integrating more originals monomers, such a tetrazine or divanillin, have been synthesized. Optoelectronic properties of such materials have been studied for the purpose of their integration into devices

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5

Ward, Simon Edward. „Novel amino-acids from imino Diels-Alder reactions“. Thesis, University of Cambridge, 1997. https://www.repository.cam.ac.uk/handle/1810/283723.

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6

Capra, Julien. „Synthese biomimetique de composes azotes biologiquement actifs“. Thesis, Paris 11, 2011. http://www.theses.fr/2011PA112030.

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Ce travail de thèse est consacré à la synthèse de composés azotés biologiquement actifs s’inspirant notamment d’une réaction biosynthétique. Dans un premier temps, nos travaux avaient pour but de développer une nouvelle voie d’accès aux acides alpha-aminés par une réaction d’isomérisation énantiosélective d’imines. Après différentes études préliminaires, les meilleurs précurseurs d’acides alphaaminés par cette méthode que nous ayons identifiés sont les alpha céto amides. L’isomérisation 1,3 d’une imine formée à partir d’un alpha céto amide et de la diphénylméthanamine à l’aide de différents alcoolates chiraux a été réalisée. L’utilisation de l’alcoolate dérivé de la (+)-N-méthylpseudoéphédrine, employé en quantité sub-stœchiométrique, a permis d’obtenir l’alpha amino amide correspondant avec un excès énantiomérique de 67%. Il reste encore à mettre au point des conditions opératoires satisfaisantes pour la conversion de cet adduit en acide alpha aminé. L’étude de l’isomérisation 1,3 d’imines nous a permis de mettre en évidence une réaction de déshydrogénation 1,4 permettant d’accéder de façon originale à des 2-azadiènes et nécessitant la présence d’oxygène. Ainsi, plusieurs 2-azadiènes non activés ont été préparés par traitement basique d’imines issues de la condensation d’acétophénones et de diphénylméthanamine sous atmosphère d’air. Dans une dernière partie, l’étude de l’addition conjuguée d’une oxazolidinone chirale sur des alkylidènemalonates de dialkyle a été réalisée dans le but de développer une méthode d’accès à des acides alpha aminés. Les conditions opératoires mises au point ont permis d’obtenir une excellente diastéréosélectivité à partir de la plupart des alkylidènemalonates de dialkyle
This thesis work is devoted to the synthesis of biologically active nitrogen-containing compounds, particularly inspired by a biosynthetic reaction. Initially, our work aimed to develop a new pathway to a-amino acids using anenantioselective imine isomerization reaction. After various preliminary studies, the best precursors of a-amino acids that we have identified are a-keto amides. The 1,3isomerization of an imine formed from an a-keto amide and diphenylmethanamine using various chiral alkoxides was then conducted. The alkoxide derived from (+)-N-méthylpseudoéphédrine, employed in sub-stoichiometric quantities, allowed obtaining the corresponding a-amino amide with 67% enantiomeric excess. It still remains to develop satisfactory operating conditions for the conversion of this adduct to an a-amino acid.The study of the 1,3 isomerization of imines allowed us to bring to light a 1,4 dehydrogenation reaction, which allows an original access to 2-azadienes and which requires the presence of oxygen. Thus, several non-activated 2-azadienes have been prepared by basic treatment of imines derived from acetophenones anddiphenylmethanamine, under air atmosphere.In the last part, the study of the conjugate addition of a chiral oxazolidinone on dialkyl alkylidenemalonates was carried out, with the aim to develop a method of access to enantiopure b-amino acids. Reactions conditions developed allowed to obtain an excellent diastereoselectivity from most dialkyl alkylidenemalonates

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Jones, Catrin A. „The asymmetric synthesis of #alpha#-amino acids from imines“. Thesis, Bangor University, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.263167.

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Lewis, Kirk Alexander. „Stereoselective synthesis using aminyl radicals derived from α-amino acids“. Thesis, Loughborough University, 1997. https://dspace.lboro.ac.uk/2134/32976.

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Chapter 1 is the introduction to the thesis. It contains an overview of amino acids and aminyl radicals. The amino acids section includes material on their synthesis through traditional methods and asymmetric syntheses, as well as the use of radical reactions in their formation. The aminyl radical section gives a description of the nature of the radical and then proceeds with general techniques for aminyl radical formation. A more detailed account of our own group's use of sulfenamides and imines in aminyl radical formation is ·covered and the chapter is ended with a look at the work of aminyl radicals in amino acid synthesis and my subsequent intentions in this area. The preparation and cyclisation of sulfenamide precursors derived from [alpha]-amino acids is discussed in chapter 2. Both the cyclisations of aminyl and urethanyl (introduction of benzyloxycarbonyl and tosyl protecting groups onto amine) radicals onto suitably placed alkenyl substituents were investigated. 5-Exo-trig cyclisation reactions successfully afforded the cyclic products in moderate yield with reasonable diastereoselectivity. The effects of the [alpha]-CO2R (where R = Me or tBu), the size of the amino acid side chain and placement of alkenyl substituent (N-substituted or sidechain containing alkene) are discussed. The use of imines as aminyl radical precursors is explored in chapter 3. [Alpha]-amino acids and aldehydes were condensed and the cyclisation products isolated. The formation of aminyl radicals by 5-exo-trig cyclisation and subsequent H-atom abstraction gave moderate to good yields of N-cyclopentyl substituted a-amino acids. Preparation of the aldehydes is discussed. Tandem cyclisations involving aspects of chapters 2 and 3 are looked at in chapter 4. The preparation of the unnatural a-amino acids required for tandem cyclisation and subsequent formation of the sulfenamide or imine is reported. 5-Exo, 6-exo cyclisation of the sulfenamide derivative gave the tandem product in low yield and with moderate diastereoselectivity. This was in contrast to the imine derived reaction which proved unsuccessful. The remaining chapters incorporate the detailing of experimental relevant to the discussion and the presentation of references quoted throughout the thesis.

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9

Betit, Lyanne. „Derivatization of Azomethine Imines into beta-Aminocarbonyl Motifs“. Thesis, Université d'Ottawa / University of Ottawa, 2015. http://hdl.handle.net/10393/32473.

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β-Aminocarbonyl motifs are a privileged substructures in medicinal chemistry and peptidomimetics. As part of our efforts toward metal free aminations, we developed a method for intermolecular amino-carbonylation of alkenes using hydrazones. This method provides access to cyclic azomethine imines containing a β-aminocarbonyl motif. Conceptually, these dipoles can be derivatized into many bioactive compounds, such as 1,3-diamines, β-amino amides and β-amino acids. The first part of this thesis will present the results on the derivatization of our aminocarbonylation products into various nitrogen-containing molecules, such as β-amino amides, β-amino acids and pyrazolones. More specifically, a short, chromatography-free derivatization of azomethine imines into N-Boc-β-amino amides will be presented. Following these results, the next chapter will focus on attempts at develop novel aminocarbonylation reactivity between 1,2-diacylhydrazines and alkenes followed by results from our reductive N-N bond cleavage experiments on our cyclic hydrazides.

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Hartley, James Holroyd. „Saccharide accelerated hydrolysis of boronic acid imines“. Thesis, University of Birmingham, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.369335.

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Bücher zum Thema "Imine acids"

1

Hartley, James Holroyd. Saccharide accelerated hydrolysis of boronic acid imines. Birmingham: University of Birmingham, 2000.

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Santanilla, Alexander Buitrago. New Approaches Towards the Asymmetric Allylation of the Formyl and Imino Groups via Strained Silane Lewis Acids. [New York, N.Y.?]: [publisher not identified], 2013.

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3

Rosenthal, Gerald. Plant Nonprotein Amino and Imino Acids: Biological, Biochemical, and Toxicological Properties. Elsevier Science & Technology Books, 2012.

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Buchteile zum Thema "Imine acids"

1

Elford, Tim G., und Dennis G. Hall. „Catalytic Additions of Allylic Boronates to Carbonyl and Imine Derivatives“. In Boronic Acids, 393–425. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527639328.ch8.

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Batey, Robert A. „Nucleophilic Addition Reactions of Aryl and Alkenylboronic Acids and Their Derivatives to Imines and Iminium Ions“. In Boronic Acids, 279–304. Weinheim, FRG: Wiley-VCH Verlag GmbH & Co. KGaA, 2006. http://dx.doi.org/10.1002/3527606548.ch7.

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Cavallini, Doriano, Giorgio Ricci, Silvestro Duprè, Laura Pecci, Mara Costa, Rosa M. Matarese, Bernardo Pensa, Antonio Antonucci, Sandro P. Solinas und Mario Fontana. „Sulfur-containing cyclic ketimines and imino acids“. In EJB Reviews 1991, 257–63. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-642-77200-9_19.

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4

Tracey, M. R., R. P. Hsung, J. Antoline, K. C. M. Kurtz, L. Shen, B. W. Slafer und Y. Zhang. „Imine/Enamide Rearrangement“. In Three Carbon-Heteroatom Bonds: Esters and Lactones; Peroxy Acids and R(CO)OX Compounds; R(CO)X, X=S, Se, Te, 1. Georg Thieme Verlag KG, 2005. http://dx.doi.org/10.1055/sos-sd-021-00408.

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Coates, C., J. Kabir und E. Turos. „Ketene–Imine Cycloadditions“. In Three Carbon-Heteroatom Bonds: Esters and Lactones; Peroxy Acids and R(CO)OX Compounds; R(CO)X, X=S, Se, Te, 1. Georg Thieme Verlag KG, 2005. http://dx.doi.org/10.1055/sos-sd-021-00569.

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„Reduction“. In Biocatalysis in Organic Synthesis: The Retrosynthesis Approach, 73–112. The Royal Society of Chemistry, 2018. http://dx.doi.org/10.1039/bk9781782625308-00073.

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This chapter covers enzyme classes that catalyse reduction reactions, including ketoreductases, enoate reductases, carboxylic acid reductases, imine reductases, amino acid dehydrogenases, opine dehydrogenases, amine dehydrogenases and nitro reductases. The chapter is divided into separate sections, each detailing the reduction of a specific functional group, including ketones, aldehydes, carboxylic acids, alkenes, imines, nitro aromatics, sulfoxides, azides, n-oxides and azo compounds. Each section begins with a review of chemical methods of carrying out each transformation, followed by a description of the enzyme classes that are also capable of carrying it out. The substrate scope of each enzyme class, including its chemo-, regio- and stereoselectivity, is discussed and a general mechanism for the enzyme-catalysed reaction is presented. Where appropriate, strategies for co-factor recycling are also included. This should give the reader a rounded understanding of when and how to carry out reduction reactions using enzymes.

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„Coenzyme Forms of Vitamin B6“. In The Chemical Biology of Human Vitamins, 193–227. The Royal Society of Chemistry, 2018. http://dx.doi.org/10.1039/bk9781788014649-00193.

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Vitamin B6 in supplements is provided as pyridoxine and converted in vivo to the side chain-phosphorylated pyridine aldehyde, pyridoxal-phosphate (PLP). The conjugated heterocyclic aldehyde can engage in imine formation with amino acids in specific enzyme sites preparatory to stabilized amino acid Cα-carbanion formation in the amino acid-PLP aldimines. From such accessible carbanionic intermediates, chemistry at Cα, Cβ, and Cγ, including retroaldol chemistry and C–C bond formations, occurs in more than 100 human enzyme sites. Indeed, the PLP coenzyme is synonymous with human amino acid metabolism

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Coates, C., J. Kabir und E. Turos. „Ester Enolate–Imine Cyclocondensations“. In Three Carbon-Heteroatom Bonds: Esters and Lactones; Peroxy Acids and R(CO)OX Compounds; R(CO)X, X=S, Se, Te, 1. Georg Thieme Verlag KG, 2005. http://dx.doi.org/10.1055/sos-sd-021-00574.

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9

Perst, H. „Connective Imine Formation by the Reaction of Thioketenes with Sulfur Diimides“. In Three Carbon-Heteroatom Bonds: Thio-, Seleno-, and Tellurocarboxylic Acids and Derivatives; Imidic Acids and Derivatives; Ortho Acid Derivatives, 1. Georg Thieme Verlag KG, 2006. http://dx.doi.org/10.1055/sos-sd-023-00772.

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Perst, H. „Connective Imine Formation by Aza-Wittig Reaction of Iminophosphoranes or Related Compounds with Ketenes“. In Three Carbon-Heteroatom Bonds: Thio-, Seleno-, and Tellurocarboxylic Acids and Derivatives; Imidic Acids and Derivatives; Ortho Acid Derivatives, 1. Georg Thieme Verlag KG, 2006. http://dx.doi.org/10.1055/sos-sd-023-00767.

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Konferenzberichte zum Thema "Imine acids"

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Mallakpour, Shadpour. „Microstructure and properties of novel optically active poly(ester-imide)/TiO2 bionanocomposites containing natural amino acids moieties“. In 2010 International Conference on Enabling Science and Nanotechnology (ESciNano). IEEE, 2010. http://dx.doi.org/10.1109/escinano.2010.5701084.

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2

Pather, Kaveshree, Nuala A. Helsby, Brian D. Palmer und Lai-Ming Ching. „Abstract 1555:In vitroandin vivoevaluation of analogs ofN-(o-carboxybenzoyl)glutamic acid imide, an active thalidomide metabolite“. In Proceedings: AACR 101st Annual Meeting 2010‐‐ Apr 17‐21, 2010; Washington, DC. American Association for Cancer Research, 2010. http://dx.doi.org/10.1158/1538-7445.am10-1555.

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WU, ZHIJIAN, FUQIANG BAN und RUSSELL J. BOYD. „THEORETICAL STUDY ON THE REACTION MECHANISMS OF THE IMIDE FORMATION IN AN N-(O-CARBOXYBENZOYL)-L-AMINO ACID“. In Proceedings of the International Symposium on Solid State Chemistry in China. WORLD SCIENTIFIC, 2002. http://dx.doi.org/10.1142/9789812776846_0077.

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Bigović, Miljan, Marija Kaluđerović, Jovana Jovanović, Haris Majstorović und Milica Kosović-Perutović. „Synthesis of Schiff bases between some five-membered heterocyclic aldehydes and thiocarbohydrazide (TCH) and optimization of reaction conditions“. In 2nd International Conference on Chemo and Bioinformatics. Institute for Information Technologies, University of Kragujevac, 2023. http://dx.doi.org/10.46793/iccbi23.435b.

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The usual way of synthesizing imines (Schiff bases) between carbonyl compounds –aldehydes and ketones – with thiocarbohydrazide (TCH) involves heating them for 3 hours in a mixture of water solvents and ethanol with the addition of a catalytic amount of concentrated hydrochloric acid. Heating in the presence of acid catalysts over a long period of time may be unsuitable for acid-sensitive, labile, reactive or thermally unstable aldehydes, which are prone to polymerization under these conditions. We tested the condensation reaction at room temperature with a series of aldehydes, while maintaining the described ratios (equimolar ratio of aldehydes and TCH), with the addition of a few drops of 36% HCl. The course and completion of the reaction were monitored using infrared spectroscopy (FTIR). The reaction time is longer compared to the heating conditions, while the yields are comparable. We obtained a series of compounds of high degree of purity, satisfactory yield varying from 50-90%, whose structure and purity were confirmed by NMR spectroscopy.

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Haynes, A., und P. Gouma. „Nanoengineering Polyaniline for Advanced Chemosensing Applications“. In ASME 2009 International Mechanical Engineering Congress and Exposition. ASMEDC, 2009. http://dx.doi.org/10.1115/imece2009-10310.

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The focus of this study is the development of polyaniline based hybrid systems for selective room temperature detection of NO2. The electrospinning technique has been employed to produce highly dispersed nanocomposites of leucoemeraldine base polyaniline (LEB-PANI) with cellulose acetate (CA) as a secondary component. The nanocomposites exhibit sensitivity and selectivity to NO2 down to 1 ppm with response time of 70s and recovery time of 155s. Spectroscopic analyses of the nanocomposites reveal that the molecular interactions between cellulose acetate and LEB-PANI yields enhanced sensitivity and selectivity to NO2. DC electrical resistance measurements of the composite during exposure to the analyte suggest that the response mechanism has some dependency on the humidity level in the gas chamber. This is found to be partly attributed to the byproduct of hydrolyzed CA: acetic acid. Infrared spectroscopy reveals that the acetate ions from the acid and polymer transforms base groups of LEB-PANI to higher oxidized states and affix to quinoid, benzenoid, and imine groups along polyaniline’s chain. These sites operate as additional reactions sites along the polymer backbone for increased ion mobility and aid in retaining the sensor’s stability and selectivity under varying gas atmospheres. This paper details the results from sensing experimentation and classical characterization techniques in an effort to develop a paradigm for chemical sensing with CA-PANI nanocomposites.

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Lee, Chi-Hung, Jia-Ru Chen, Hung-Wei Shiu, Ko-Shan Ho, Shinn-Dar Wu, Kuo-Huang Hsieh und Yen-Zen Wang. „Effect of Bridging Groups on Sulfonated Poly(Imide-Siloxane) for Application in Proton Exchange Membrane of Fuel Cells“. In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65155.

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A series of six-membered sulfonated poly(imide-siloxane)s were synthesized using 1,4,5,8-naphthalenetetracarboxylic dianhydride (NTDA), aminopropyl-terminated polydimethylsiloxane (PDMS) 2,2-benzidinedisulfonic acid (BDSA), as the sulfonation target diamine groups, and various non-sulfonated diamine monomers behaving as bridging groups. The structure-property relationship of SPI-SXx membranes is discussed in details according to the chemical structure of the nvarious non-sulfonated diamines of SPI-SXx membranes from the viewpoints of proton conductivity, ion exchange capacity (IEC) and membranes properties (water uptake, membrane swelling) at equal PDMS content SPI-SXx. They showed good solubility and high thermal stability up to 300 °C. The PDMS was introduced to enhance the proton conductivity and water uptake attributed from the highly flexibility of the siloxane segments. They showed a comparable or even higher proton conductivity than that of Nafion 117 in water at 60 °C. The conductivity and water uptake of angled, SPI-SXm and ODA-based SPI-SX membranes (SPI-SXO) are greater than those prepared from DDM-based SPI-SX membranes (SPI-SXD) at a given IEC. These differences resulted from the increased numbers of entanglements of the flexibility membrane. The SPI-SXD showed alomost isotropically dimensional changes with the increases of water uptake and the volume were slightly smaller than those estimated from the additivity rule. Microscopic analyses revealed that these smaller (<10 nm) and well-dispersed hydrophilic domains contribute to the better proton conducting properties. The new sulfonated poly(imide-siloxane)s have proved to be a possible candidate as the polymer electrolyte membrane for PEFCs and DMFCs.

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