scholarly journals Fixation of Molecular Nitrogen Using Aliphatic Carboxylic Acid by Nitrogen Arc Plasma. Formation of Amino Acids

1987 ◽  
Vol 16 (2) ◽  
pp. 365-368 ◽  
Author(s):  
Michiaki Takasaki ◽  
Kaoru Harada
Keyword(s):  
Amino Acids ◽  
Carboxylic Acid ◽  
Molecular Nitrogen ◽  
Plasma Formation ◽  
Arc Plasma ◽  
Aliphatic Carboxylic Acid

Aliphatic Carboxylic Acid as Hydrogen-Bond Donor for Converting CO2 and Epoxide into Cyclic Carbonate under Mild Conditions

2021 ◽  
Author(s):  
Zheng Wang ◽  
Yajun Wang ◽  
Qianjie Xie ◽  
Zhiying Fan ◽  
Yehua Shen
Keyword(s):  
Hydrogen Bond ◽  
Carboxylic Acid ◽  
Value Added ◽  
Cyclic Carbonate ◽  
Hydrogen Bond Donor ◽  
Title Reaction ◽  
Aliphatic Carboxylic Acid ◽  
Mild Conditions ◽  
Atmospheric Carbon

The coupling of CO2 and epoxide is promising way to reduce atmospheric carbon by converting it into value-added cyclic carbonate. Pursuing efficient catalysts is highly attractive for the title reaction....

Synthesis and Antibacterial Potency of 4-Methyl-2,7-dioxo-1,2,3,4,7,10- hexahydropyrido[2,3-ƒ]quinoxaline-8-carboxylic acid, Selected [a]-Fused Heterocyles and Acyclic Precursors

2007 ◽  
Vol 62 (11) ◽  
pp. 1453-1458 ◽  
Author(s):  
Yusuf M. Al-Hiari ◽  
Ali M. Qaisia ◽  
Mohammad Y.Abu Shuheil ◽  
Mustafa M. El-Abadelah ◽  
Wolfgang Voelter
Keyword(s):  
Amino Acids ◽  
Carboxylic Acid ◽  
Antibacterial Activities ◽  
Sodium Dithionite ◽  
E Coli ◽  
Pipecolinic Acid

The reaction of 7-chloro-1-cyclopropyl-6-fluoro-8-nitro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid (7) with each of sarcosine and (±)-pipecolinic acid afforded the corresponding N-(4- oxoquinolin-7-yl)-α-amino acids 8 and 9. Reductive lactamization of the latter with sodium dithionite gave hexahydropyrido[2,3- f ]quinoxaline (10) and octahydrodipyrido[1,2-a : 2,3- f ]quinoxaline (11) derivatives, respectively. Compounds 8 - 11 and their homologs 1 - 6, accessible from (S)-proline, (2S, 4R)-4-hydroxyproline and (S)-tetrahydroisoquinoline-3-carboxylic acid exhibit good to excellent antibacterial activities against E. coli and S. aureus.

scholarly journals Comparison of Three Solid Phase Materials for the Extraction of Carboxylic Acids from River Water Followed by 2D GC × GC-TOFMS Determination

2016 ◽  
Vol 2016 ◽  
pp. 1-8 ◽  
Author(s):  
G. O. Bosire ◽  
J. C. Ngila ◽  
H. Parshotam
Keyword(s):  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Natural Organic Matter ◽  
Solid Phase ◽  
Cooling Water ◽  
Raw Water ◽  
Aliphatic Carboxylic Acid ◽  
Hydrophobic Nature ◽  
Relationship Of

The extraction and determination of aliphatic and aromatic carboxylic acids as well as their influence on the aromaticity and molecularity relationship of natural organic matter (NOM) in water are reported in this study. Three solid phase extraction (SPE) sorbents were used and their extraction efficiencies evaluated after chromatographic determinations (using gas chromatography with a time of flight mass spectrometer (GC × GC-TOFMS) and liquid chromatography with organic carbon detector (LC-OCD)). More than 42 carboxylic acids were identified in raw water from the Vaal River, which feeds the Lethabo Power Generation Station, South Africa, with cooling water. The aromatic carboxylic acid efficiency (28%) was achieved by using Strata™X SPE while the highest aliphatic carboxylic acid efficiency (92.08%) was achieved by silica SPE. The hydrophobic nature of NOM in water depends on the nature of organic compounds in water, whether aromatic or aliphatic. The LC-OCD was used to assess the hydrophobicity levels of NOM as a function of these carboxylic acids in cooling water. The LC-OCD results showed that the aromatic nature of NOM in SPE filtered water followed the order Silica>Strata X>C-18. From the results, the hydrophobicity degree of the samples depended on the type and number of carboxylic acids that were removed by the SPE cartridges.

Enzymatic resolution of (±)-5-phenyl-4,5-dihydroisoxazole-3-carboxylic acid ethyl ester and its transformations into polyfunctionalised amino acids and dipeptides

2009 ◽  
Vol 20 (16) ◽  
pp. 1940-1947 ◽  
Author(s):  
Giuseppe Cremonesi ◽  
Piero Dalla Croce ◽  
Alessandra Forni ◽  
Maddalena Gallanti ◽  
Raffaella Gandolfi ◽  
...  
Keyword(s):  
Amino Acids ◽  
Carboxylic Acid ◽  
Ethyl Ester ◽  
Acid Ethyl Ester ◽  
Enzymatic Resolution
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