Thematische Bibliographien / Dibutylamine

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Auswahl der wissenschaftlichen Literatur zum Thema „Dibutylamine“

Autor: Grafiati

Veröffentlicht am 29. Juni 2021

Zuletzt aktualisiert am 9. Februar 2022

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Zeitschriftenartikel zum Thema "Dibutylamine"

Ji, Wen Jin, Wei Song, Yu Ying Zheng und Xiang Zhu He. „Improvement of Method for Determination of Isocyanate Group Content in Polyurethane Prepolymer“. Applied Mechanics and Materials 303-306 (Februar 2013): 2533–36. http://dx.doi.org/10.4028/www.scientific.net/amm.303-306.2533.

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This paper represents the improvement of method for determination of isocyanate group content in polyurethane prepolymer. Acetone-dibutylamine method and toluene-dibutylamine method were used separately to determine the isocyanate group content in polyurethane prepolymer. The –NCO content tested by the two methods were close. In the former method, 15-20 mL acetone was used as solvent and the titration end point was easy to confirm. While in the latter method, additional solvent (isopropanol) was used which causes environmental contamination.

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Brittle, Stuart A., Tim H. Richardson, Lisa Varley und Chris A. Hunter. „Amine-sensing properties of a covalently linked calix[4]arene–porphyrin ("calixporph") multilayered film“. Journal of Porphyrins and Phthalocyanines 14, Nr. 12 (Dezember 2010): 1027–33. http://dx.doi.org/10.1142/s1088424610002859.

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Four zinc porphyrin molecules have been linked covalently to a central amphiphilic calix[4]arene molecule to form a zinc "calixporph", ZnCP , which displays enhanced sensitivity to dibutylamine compared to both the discrete zinc porphyrin and two-component mixtures of zinc porphyrin with calixarene. Langmuir-Blodgett films (20 monolayers) of ZnCP display UV-visible spectra which are modified upon exposure to dibutylamine in the concentration range 0.09–0.45 ppt (in N2 ) with a t50 response time of 8.8 s. The dense packing of the monomeric porphyrin moieties leads to a high absorbance per layer and thus a large sensing signal compared to other LB films capable of amine-detection. This, coupled to the very fast t50 value, leads to a high figure of merit. This verifies the adopted strategy of using a covalently linked calixporph in order to avoid the potential problems of phase separation associated with two-component mixtures. Furthermore, the ZnCP is selectively responsive to the secondary amine, dibutylamine, compared to the primary and tertiary compounds.

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King, James F., Manjinder S. Gill und Petru Ciubotaru. „Benzenesulfonyl chloride with primary and secondary amines in aqueous media Unexpected high conversions to sulfonamides at high pH“. Canadian Journal of Chemistry 83, Nr. 9 (01.09.2005): 1525–35. http://dx.doi.org/10.1139/v05-154.

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We have determined pHyield profiles under pseudo-first-order conditions of the reactions of benzenesulfonyl chloride with a set of primary and secondary water-soluble alkylamines, and have found with certain amines, such as dibutylamine, a profile taking the form of a sigmoid pH&#150yield curve with relatively high yields of the sulfonamide persisting with increasing basicity up to and including 1.0 mol/L sodium hydroxide. This behaviour is quantitatively accounted for by invoking, in addition to the usual second-order reaction of the sulfonyl chloride with the amine, two third-order terms (i) one first-order in sulfonyl chloride, amine and hydroxide anion, and (ii) another first-order in sulfonyl chloride and second-order in the amine. The importance of the third-order terms correlates approximately with the total number of alkyl carbon atoms in the amine, and this in turn is regarded as related to the hydrophobic character of the amine. Experiments to test this picture included: (i) observation of a bell-shaped curve with bis(2-methoxyethyl)amine, (ii) in the reaction of dibutylamine in THF&#150H2O (1:1), and also (iii) in the reaction of dibutylamine in 1.0 mol/L tetrabutylammonium bromide, and (iv) increase in the contributions of the third-order terms in 1.0 mol/L aqueous sodium chloride. Preparative reactions with dibutylamine, 1-octylamine, and hexamethylenimine in 1.0 mol/L aqueous sodium hydroxide with a 5% excess of benzenesulfonyl chloride gave, respectively, 94%, 98%, and 97% yields of the corresponding sulfonamides. Key words: sulfonyl chlorides, primary and secondary amines, pHyield profiles, organic synthesis in water, hydrophobic effects.

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Djudjic, Radana, und Branka Rodic-Grabovac. „Synthesis of dialkylaminocarbonyl N-chloro- carbonyl-N-phenyl-4-aminobenzo-(-pyrone derivatives“. Acta Periodica Technologica, Nr. 35 (2004): 187–91. http://dx.doi.org/10.2298/apt0435187d.

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The title compounds were prepared by condensation of N-chlorocarbonyl-N-phenyl-4-aminobenzo-(-pyrone with diethylamine dibutylamine and isopropylamine. The starting compound used for condensation with amines was obtained by a reaction of N-phenyl-4-aminobenzo-(-pyrone with oxalyl chloride.

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Sun, Yue, Weisheng Zheng und Deqiang Yin. „Removal of 2-naphthalenesulfonic acid using novel dual functional weakly basic anion exchange resins from aqueous solution“. Adsorption Science & Technology 37, Nr. 3-4 (18.01.2019): 260–73. http://dx.doi.org/10.1177/0263617418824809.

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Two novel weakly basic anion exchange resins BNH and BN2 bearing two different functional groups was fabricated via the two-step amination of chloromethylated polystyrene-divinylbenzene beads with dibutylamine and dimethylamine. The adsorption properties of BNH and BN2 for the 2-naphthalenesulfonic acid (NSA) removal from wastewater were compared with two synthesized monofunctional anion exchange resins BN0 and BN6 (derived from dimethylamine and dibutylamine, respectively). The experimental data revealed that the adsorption process on the four resins fitted well with the pseudo-second-order kinetics equation and the equilibrium isotherms were in good agreement with the Langmuir model. Thermodynamic analyses illustrated that 2-naphthalenesulfonic acid adsorption onto resins was an endothermic and spontaneous process. Importantly, BN2 still displayed relatively high adsorption capacity in the existence of Na2SO4, indicative of an excellent selectivity for 2-naphthalenesulfonic acid over sulfate than other resins. The obtained results elucidate that BN2 could have potential industrial application in effluent disposal fields because of its superior selectivity, acceptable kinetics, and desorption capability.

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Kalla, Reddi Mohan Naidu, Mi Ri Kim und Il Kim. „Dibutylamine-catalysed efficient one-pot synthesis of biologically potent pyrans“. Tetrahedron Letters 56, Nr. 5 (Januar 2015): 717–20. http://dx.doi.org/10.1016/j.tetlet.2014.12.079.

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Jing, Guohua, Fan Liu, Bihong Lv, Xiaobin Zhou und Zuoming Zhou. „Novel Ternary Absorbent: Dibutylamine Aqueous–Organic Solution for CO2 Capture“. Energy & Fuels 31, Nr. 11 (27.10.2017): 12530–39. http://dx.doi.org/10.1021/acs.energyfuels.7b02382.

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Gomes, Ana T. P. C., Patrícia C. Freire, Catarina R. M. Domingos, Maria G. P. M. S. Neves, José A. S. Cavaleiro, Filipe A. Almeida Paz, Jorge A. Saraiva und Augusto C. Tomé. „Synthesis under high hydrostatic pressure — a new method to prepare 5,10,15,20-tetrakis[4-(substituted amino)-2,3,5,6-tetrafluorophenyl]porphyrins“. Journal of Porphyrins and Phthalocyanines 20, Nr. 08n11 (August 2016): 1377–89. http://dx.doi.org/10.1142/s108842461650111x.

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5,10,15,20-Tetrakis(pentafluorophenyl)porphyrin reacts with primary alkylamines and heterocyclic amines, at 50°C and under high pressure (450 MPa), to produce the [Formula: see text]-substituted tetraamino derivatives in high yields. Under similar conditions, the reaction with the bulky dibutylamine and dipentylamine affords the corresponding mono-substituted dialkylaminoporphyrins in 10% yield. This new protocol arises as a considerable improvement of the methods already known, which usually require high temperatures and are not effective when using secondary amines having long alkyl groups.

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Horálek, Jiří, Emil Krejcar und Jaroslav Churáček. „Addition of secondary amino group to double bond of acrylates“. Collection of Czechoslovak Chemical Communications 53, Nr. 4 (1988): 833–38. http://dx.doi.org/10.1135/cccc19880833.

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The near IR region spectroscopy has been used to follow the addition reactions of the secondary amino groups of the tert-butyl 3-butylaminopropanoate, N,N'-dibutyl-3-aminopropanamide, and dibutylamine to tert-butyl acrylate. The additions are bimolecular reactions of the second order. The respective rate constants found for the above-mentioned compounds are 3·54 . 10-6, 2·34 . 10-5, and 3·18 . 10-6 l mol-1 s-1. The secondary amidic groups increase the nucleophilicity of secondary amino group and hence also the rate of the addition reaction.

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Fiddler, Walter, und Robert C. Doerr. „Gas Chromatographic/Chemiluminescence Detection (Thermal Energy Analyzer-Nitrogen Mode) Method for the Determination of Dibutylamine in Hams“. Journal of AOAC INTERNATIONAL 76, Nr. 3 (01.05.1993): 578–81. http://dx.doi.org/10.1093/jaoac/76.3.578.

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Abstract A gas chromatographic (GC) procedure is described for the determination of dibutylamine (DBA) in ham at less than 1 ppm. Sample is extracted with 0.5N HCI, centrifuged, made basic, and then extracted with isopropyl alcohol. Final determination is by GC/thermal energy analysis in the nitrogen mode. Six replicate analyses of ham fortified with 0.5 ppm DBA gave a recovery of 90.2 ± 3.4%. Over a range of 0.5 to 3.0 ppm DBA, the repeatability was 0.07 ppm, and the coefficient of variation was 6.07%. Limit of detection was 01 ppm. Effectiveness of the procedure was demonstrated on selected ham samples.

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Dissertationen zum Thema "Dibutylamine"

Jasinski, Rebecka. „Preparative chromatographyfor modified oligonucleotides : Method development for modified oligonucleotides, fromanalytical to preparative chromatography“. Thesis, Karlstads universitet, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-85021.

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Synthetic oligonucleotides, which are short strings of DNA or RNA, are a grooving area of importance for the pharmaceutical industry and for companies that manufacture diagnostic components. The manufacturing process of synthetic oligonucleotides involves many complex processes that use separation and purification techniques like ion-exchange chromatography, ion-pair reversed phase chromatography and ultra-performance liquid chromatography. In this study, the focus lies on the purification process, where the main aim is to develop a separation and purification method for modified oligonucleotides that can be applied on different scales, from an analytical to a preparative scale. Three modified oligonucleotides, and one unmodified with 44 bases, provided by Scandinavian Gene Synthesis (Västerås, Sweden), were analysed and purified on an ultra-performance liquid chromatography and on a preparative-system. Several parameters were investigated, e.g. mobile phase composition, gradients and concentration. Practical analysis and purification were made in two scales; analytical and semi-preparative. The results showed that the samples contained impurities that were hard to separate from the main sample. The scaling-up tests showed that, with increasing concentration, the impurities become more aggregated with the main product. Fraction analysis showed that several pure fractions were collected from the semi-preparative purification, and therefore some amount of pure sample were collected from the semi-preparative run. In conclusion, the method developed in this master thesis worked well as a significant amount of samples were purified in the semi-preparative purification, and the method worked on modified and unmodified oligonucleotides, containing different amount of modifications.
Syntetiska oligonukleotider, vilket är korta strängar av DNA eller RNA, är ett framväxande område i läkemedelsindustrin och för företag som tillverkar diagnostiska komponenter. Tillverkningsprocessen för syntetiska oligonukleotider involverar många komplexa processer som använder separation- och reningstekniker som jonbyteskromatografi, jonparskromatografi och ultra-performance kromatografi. I denna studie ligger fokus på reningsprocessen där det huvudsakliga syftet är att utveckla en separation- och renings metod för modifierade oligonukleotider som kan appliceras på olika skalor – från analytisk till preparativ skala. Tre modifierade oligonukleotider, samt en omodifierad med 44 baser, tillhandahållet av Scandinavian Gene Synthesis (Västerås, Sverige), analyserades och renades på ett ultra-performance kromatografi system och ett preparativt reningssystem. Flertal parametrar undersöktes, bland annat mobilfasens komposition, gradienter och koncentration. Analys och rening utfördes i två skalor; analytisk och semi-preparativ skala. Resultatet visade att proverna innehöll föroreningar som var svåra att separera från huvudkomponenten. Uppskalningstesterna visade att föroreningarna blandade sig mer med huvudkomponenten då koncentrationen ökade. Fraktionsanalyser visade att flera rena fraktioner blev ihopsamlade från den semi-preparativa reningen, som därav visade att en betydelsefull mängd rent prov blev renat i den semi-preparativa reningen. Sammanfattningsvis, den metod som utvecklats i denna uppsats fungerade bra då betydelsefulla mängder oligonukleotider kunde renas till olika grad vid den semi-preparativa reningen, samt att metoden fungerade för både modifierade och icke-modifierade oligonukleotider som innehöll olika mängder modifikationer.

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Buchteile zum Thema "Dibutylamine"

Wohlfarth, Ch. „Viscosity of dibutylamine“. In Supplement to IV/18, 558. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_311.

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Wohlfarth, Christian. „Viscosity of dibutylamine“. In Viscosity of Pure Organic Liquids and Binary Liquid Mixtures, 338. Berlin, Heidelberg: Springer Berlin Heidelberg, 2017. http://dx.doi.org/10.1007/978-3-662-49218-5_310.

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Wohlfarth, Ch. „Refractive index of dibutylamine“. In Refractive Indices of Pure Liquids and Binary Liquid Mixtures (Supplement to III/38), 470. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75291-2_281.

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Holze, Rudolf. „Ionic conductivities of dibutylamine bis(trifluoromethylsulfonyl)imide“. In Electrochemistry, 492. Berlin, Heidelberg: Springer Berlin Heidelberg, 2016. http://dx.doi.org/10.1007/978-3-642-02723-9_442.

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Wohlfarth, Ch. „Viscosity of the mixture (1) benzene; (2) dibutylamine“. In Supplement to IV/18, 2583. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_1558.

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Wohlfarth, Ch. „Viscosity of the mixture (1) cyclohexane; (2) dibutylamine“. In Supplement to IV/18, 2651. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_1599.

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Wohlfarth, Ch. „Viscosity of the mixture (1) ethanol; (2) dibutylamine“. In Supplement to IV/18, 1392. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_801.

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Wohlfarth, Ch. „Viscosity of the mixture (1) heptan-1-ol; (2) dibutylamine“. In Supplement to IV/18, 2922. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_1767.

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Wohlfarth, Ch. „Viscosity of the mixture (1) propan-1-ol; (2) dibutylamine“. In Supplement to IV/18, 1778. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_1030.

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Wohlfarth, Ch. „Viscosity of the mixture (1) butan-1-ol; (2) dibutylamine“. In Supplement to IV/18, 2231. Berlin, Heidelberg: Springer Berlin Heidelberg, 2008. http://dx.doi.org/10.1007/978-3-540-75486-2_1323.

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