Bibliografías temáticas / Carbamate formation

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Literatura académica sobre el tema "Carbamate formation"

Autor: Grafiati
Publicado: 10 de marzo de 2023

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Artículos de revistas sobre el tema "Carbamate formation"

1

Lőrincz, László, Zsolt Hovonyecz, János Madarász, Erzsébet Varga, and Edit Székely. "Resolution of ibuprofen with primary amine carbamates in supercritical carbon dioxide." Periodica Polytechnica Chemical Engineering 63, no. 2 (2019): 312–17. http://dx.doi.org/10.3311/ppch.12918.

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Three new, successful resolving agents, namely (S)-2-phenylglycinol, (R)-1-phenylethanaminium (R)-(1-phenylethyl) carbamate and (S)-2-hydroxy-1-phenylethanaminium (S)-(2-hydroxy-1-phenylethyl) carbamate of ibuprofen are presented. The carbamate salts are stable white crystals, they can be easily stored and handled. All salt forming resolution were performed in supercritical carbon dioxide as the only solvent. The enantioseparations were efficient (approx. 50 % enantiomeric purities, > 90 % yields in the crystalline phase) and robust. Unlike previous experiences with primary amine resolving agents, the diastereomeric salt formations and resolutions were competed in short times, even within one hour suggesting that the carbamates are intermediates of the salt formation reaction.
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2

Meigh, Louise. "CO2 carbamylation of proteins as a mechanism in physiology." Biochemical Society Transactions 43, no. 3 (2015): 460–64. http://dx.doi.org/10.1042/bst20150026.

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Carbamate bonds occur following the nucleophilic attack of CO2 on to an amine. In proteins, this can occur at lysine side chains or at the N-terminus. For CO2 binding to occur an amine must be present in the NH2 form and consequently carbamates represent a site-specific post-translational modification, occurring only in environments of reduced hydration. Due to the specific nature of these interactions, coupled with the inability of these bonds to survive protein preparation methods, carbamate reactions appear rare. However, more biologically important examples continue to emerge that use carbamates as key parts of their mechanisms. In this review, we discuss specific examples of carbamate bond formation and their biological consequences with an aim to highlight this important, and often forgotten, biochemical group.
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3

Dettman, Heather D., Joel H. Weiner, and Brian D. Sykes. "A 19F nuclear magnetic resonance study of the interaction of carbon dioxide with fluoro-amino acids." Canadian Journal of Biochemistry and Cell Biology 63, no. 10 (1985): 1120–26. http://dx.doi.org/10.1139/o85-140.

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The 19F nuclear magnetic resonance (NMR) spectra of 3-fiuorophenylalanine and 3-fluorotyrosine in bicarbonate buffer are characterized by a main resonance band and a well-resolved upfield resonance. We show that the upfield resonance is due to the formation of a carbamate between the amino group of the amino acid and bicarbonate. The intensity of the upfield resonance is dependent on the pH (pD) of the solution and reflects changes in the concentration of the free amino acid and carbamate. Thus the normalized spectral peaks can be used to quantitate the free amino acid and carbamate concentrations and these concentrations have been used to determine the equilibrium constant of the carbamate reaction. The value of the equilibrium constant obtained, using an equation which considered the various ionic states of the reactants, was 8.52 × 10−6 ± 0.27 × 10−6 for 3-fiuorophenylalanine and 8.84 × 10−6 ± 0.72 × 10−6 for 3-fluorotyrosine. These values are within the range expected for amino acids and indicate that the fluorine nucleus does not perturb the reaction significantly and that the 19F NMR can be used to quantitate the formation of carbamates in solutions of fluorine-labelled amino acids.
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4

Jeong, Byung-Hoon, Hee-Kwon Kim, and David H. Thompson. "A Facile and Efficient Method for the Formation of Unsymmetrical Ureas Using DABAL-Me3." Australian Journal of Chemistry 69, no. 7 (2016): 805. http://dx.doi.org/10.1071/ch15675.

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A practical synthetic method for the formation of unsymmetrical-substituted ureas is described. The synthesis of the unsymmetrical ureas was readily performed from 2,2,2-trichloroethyl carbamate compounds by treatment of amines with bis(trimethylaluminum)-1,4-diazabicyclo[2.2.2]octane (DABAL-Me3). Using this reaction protocol, various trisubstituted and tetrasubstituted ureas were synthesized in high yields. This study offers a promising approach for the facile synthesis of a variety of unsymmetrical ureas from 2,2,2-trichloroethyl carbamates.
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5

Sakaitani, Masahiro, and Yasufumi Ohfune. "Syntheses and reactions of silyl carbamates. 2. A new mode of cyclic carbamate formation from tert-butyldimethylsilyl carbamate." Journal of the American Chemical Society 112, no. 3 (1990): 1150–58. http://dx.doi.org/10.1021/ja00159a040.

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6

Delbressine, L. P. C., C. W. Funke, M. van Tilborg, and F. M. Kaspersen. "On the formation of carbamate glucuronides." Xenobiotica 20, no. 1 (1990): 133–34. http://dx.doi.org/10.3109/00498259009046820.

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7

McCann, Nichola, Marcel Maeder, and Hans Hasse. "A calorimetric study of carbamate formation." Journal of Chemical Thermodynamics 43, no. 5 (2011): 664–69. http://dx.doi.org/10.1016/j.jct.2010.12.001.

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8

E, Yue, Qian Yang, Yang Guo, Lushi Lian, Jing Li, and Ernest R. Blatchley. "CH3NCl2 Formation from Chlorination of Carbamate Insecticides." Environmental Science & Technology 53, no. 22 (2019): 13098–106. http://dx.doi.org/10.1021/acs.est.9b03891.

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9

Ciftja, Arlinda F., Ardi Hartono, and Hallvard F. Svendsen. "Carbamate Formation in Aqueous - diamine - CO2 Systems." Energy Procedia 37 (2013): 1605–12. http://dx.doi.org/10.1016/j.egypro.2013.06.036.

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10

Aylott, R. I., G. C. Cochrane, M. J. Leonard, et al. "ETHYL CARBAMATE FORMATION IN GRAIN BASED SPIRITS: PART I: POST-DISTILLATION ETHYL CARBAMATE FORMATION IN MATURING GRAIN WHISKY." Journal of the Institute of Brewing 96, no. 4 (1990): 213–21. http://dx.doi.org/10.1002/j.2050-0416.1990.tb01030.x.

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