Synthesis of cyclic carbonates from CO 2 and propylene oxide (PO) with deep eutectic solvents (DESs) based on amino acids (AAs) and dicarboxylic acids

2017 ◽  
Vol 22 ◽  
pp. 400-406 ◽  
Author(s):  
Hongying Lü ◽  
Kai Wu ◽  
Yuchao Zhao ◽  
Lingwan Hao ◽  
Weiping Liao ◽  
...  
Keyword(s):  
Amino Acids ◽  
Propylene Oxide ◽  
Dicarboxylic Acids ◽  
Deep Eutectic Solvents ◽  
Cyclic Carbonates

scholarly journals Strecker degradation products of aspartic and glutamic acids and their amides

2013 ◽  
Vol 19 (No. 2) ◽  
pp. 41-45 ◽  
Author(s):  
J. Rössner ◽  
J. Velíšek ◽  
F. Pudil ◽  
J. Davídek
Keyword(s):  
Amino Acids ◽  
Glutamic Acid ◽  
Aspartic Acid ◽  
Degradation Products ◽  
Dicarboxylic Acids ◽  
Reaction Products ◽  
Degradation Reactions ◽  
Strecker Aldehydes ◽  
Volatile Products ◽  
Acid Acid

Aspartic and glutamic acids, asparagine and glutamine were oxidised with either potassium peroxodisulphate or glyoxal. Nonvolatile products were derivatised and analysed by GC/FID and GC/MS. Volatile reaction products were isolated and analysed by the same methods. It was found that the degradation reactions of amino acids are complex. Amino acids are principally degraded via the corresponding a-keto acids to Strecker aldehydes (aspartic acid to oxalacetic and 3-oxopropionic acids and glutamic acid to a-ketoglutaric and 4-oxobutyric acids), which are unstable and decomposed by decarboxylation to the corresponding aldehydes. Aspartic acid also eliminates ammonia and yields fumaric acid whereas glutamic acid gives rise to an imine, pyroglutamic acid. A recombination of free radicals leads to dicarboxylic acids (succinic acid from aspartic acid, succinic, glutaric and adipic acids from glutamic acid). The major volatile products (besides the aldehydes) are lower carboxylic acids (acetic acid from aspartic acid and propionic acid acid from glutamic acid) that can at least partly arise by radical reactions. In both quality and quantity terms, a higher amount of degradation products arises by oxidation of amino acids by peroxodisulphate.

scholarly journals Study of Superbase-Based Deep Eutectic Solvents as the Catalyst in the Chemical Fixation of CO2 into Cyclic Carbonates under Mild Conditions

Materials ◽  
2017 ◽  
Vol 10 (7) ◽  
pp. 759 ◽  
Author(s):  
Sara García-Argüelles ◽  
Maria Ferrer ◽  
Marta Iglesias ◽  
Francisco Del Monte ◽  
María Gutiérrez
Keyword(s):  
Deep Eutectic Solvents ◽  
Chemical Fixation ◽  
Cyclic Carbonates ◽  
Mild Conditions

SOME PROPERTIES OF APOFERRITIN ISOLATED FROM GUINEA PIG LIVER

1962 ◽  
Vol 40 (1) ◽  
pp. 983-987 ◽  
Author(s):  
Felix Friedberg
Keyword(s):  
Amino Acids ◽  
Amino Acid ◽  
Guinea Pig ◽  
Amino Acid Composition ◽  
Acid Composition ◽  
Guinea Pigs ◽  
Dicarboxylic Acids ◽  
Acetate Buffer ◽  
Pig Liver ◽  
Guinea Pig Liver

Apoferritin isolated from livers of guinea pigs and characterized by a s°w,20 of 17.7 and a pI of 4.8 (in acetate buffer Γ/2 0.1) was hydrolyzed with 5.7 N HCl for 22 and 44 hours and its amino acid composition determined. The protein appears rich in dicarboxylic acids and in leucine. The content of sulphur-containing amino acids is fairly small.

Niobium(v) chloride and imidazolium bromides as efficient dual catalyst systems for the cycloaddition of carbon dioxide and propylene oxide

2014 ◽  
Vol 4 (6) ◽  
pp. 1638-1643 ◽  
Author(s):  
Michael E. Wilhelm ◽  
Michael H. Anthofer ◽  
Robert M. Reich ◽  
Valerio D'Elia ◽  
Jean-Marie Basset ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Catalytic Activity ◽  
Propylene Oxide ◽  
Catalyst System ◽  
Cyclic Carbonates ◽  
Imidazolium Salt ◽  
Catalyst Systems

Imidazolium bromides combined with niobium(v) choride were used as catalyst system for the reaction of CO2 with epoxides to cyclic carbonates. The variation of the cation structure strongly affects the properties of the imidazolium salt and therefore the catalytic activity.

Are gamma amino acids promising tools of crystal engineering? – Multicomponent crystals of baclofen

CrystEngComm ◽  
2015 ◽  
Vol 17 (43) ◽  
pp. 8264-8272 ◽  
Author(s):  
Nikoletta B. Báthori ◽  
Ornella E. Y. Kilinkissa
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Amino Acids ◽  
Crystal Engineering ◽  
Sulfonic Acid ◽  
Dicarboxylic Acids ◽  
Monocarboxylic Acids ◽  
X Ray ◽  
Toluene Sulfonic Acid

The crystal structure, thermal analysis and powder X-ray analysis of the multicomponent crystals formed between baclofen and selected monocarboxylic acids, dicarboxylic acids and p-toluene sulfonic acid are presented.

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