Separation of C1–C5 aliphatic carboxylic acids on a highly sulfonated styrene–divinylbenzene copolymer resin column with a C6 aliphatic carboxylic acid solution as the mobile phase

2003 ◽  
Vol 481 (1) ◽  
pp. 15-21 ◽  
Author(s):  
Kazutoku Ohta ◽  
Masayoshi Ohashi
Keyword(s):  
Carboxylic Acid ◽  
Acid Solution ◽  
Carboxylic Acids ◽  
Mobile Phase ◽  
Resin Column ◽  
Aliphatic Carboxylic Acid ◽  
Styrene Divinylbenzene ◽  
Aliphatic Carboxylic Acids

ALIPHATIC CARBOXYLIC ACIDS IN CHERNOZEMIC SOILS

1982 ◽  
Vol 62 (3) ◽  
pp. 487-494 ◽  
Author(s):  
J. F. Dormaar
Keyword(s):  
Organic Matter ◽  
Carboxylic Acid ◽  
Carboxylic Acids ◽  
Dioctyl Phthalate ◽  
Gas Chromatography Mass Spectrometry ◽  
Grass Species ◽  
Aliphatic Carboxylic Acid ◽  
High Resolution Gas Chromatography ◽  
Aliphatic Carboxylic Acids ◽  
Extractable Organic Matter

For Chernozemic soils, published information on the aliphatic carboxylic acid fraction of the organic matter is scarce. Yet, geologically they are chemically stable and persist for long periods of time. The distribution of chloroform/methanol-extractable aliphatic carboxylic acids in five uncultivated and three cultivated Chernozemic soils and the roots of four grass species was, therefore, determined. Twenty-three organic acids (up to C30) were tentatively identified by high resolution gas chromatography-mass spectrometry. Hexanedioic acid and dioctyl phthalate were suspected of being contaminants. The relative proportions of aliphatic carboxylic acids varied for different soils. Tree invasions, overgrazing, and cultivation decreased the total aliphatic carboxylic acid content at the expense of the lower weight aliphatic carboxylic acids. Since the aliphatic carboxylic acids formed only a small portion of the total solvent-extractable organic matter and decreased after cultivation, the results do not explain the observation reported earlier that solvent-extractable organic matter of Chernozemic soils increased as a result of cultivation.

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.

Direct C(sp3)–H Activation of Carboxylic Acids

Synthesis ◽  
2019 ◽  
Vol 52 (04) ◽  
pp. 479-488 ◽  
Author(s):  
Alexander Uttry ◽  
Manuel van Gemmeren
Keyword(s):  
Carboxylic Acid ◽  
General Solution ◽  
Carboxylic Acids ◽  
Bond Activation ◽  
Acid Moiety ◽  
Group Approach ◽  
Research Fields ◽  
Directing Group ◽  
Aliphatic Carboxylic Acids

Carboxylic acids are important in a variety of research fields and applications. As a result, substantial efforts have been directed towards the C–H functionalization of such compounds. While the use of the carboxylic acid moiety as a native directing group for C(sp2)–H functionalization reactions is well established, as yet there is no general solution for the C(sp3)–H activation of aliphatic carboxylic acids and most endeavors have instead relied on the introduction of stronger directing groups. Recently however, novel ligands, tools, and strategies have emerged, which enable the use of free aliphatic carboxylic acids in C–H-activation-based transformations.1 Introduction2 Challenges in the C(sp3)–H Bond Activation of Carboxylic Acids3 The Lactonization of Aliphatic Carboxylic Acids4 The Directing Group Approach5 The Direct C–H Arylation of Aliphatic Carboxylic Acids6 The Direct C–H Olefination of Aliphatic Carboxylic Acids7 The Direct C–H Acetoxylation of Aliphatic Carboxylic Acids8 Summary

scholarly journals Electrochemical analysis of the carboxy-14C-labelled aliphatic carboxylic acid metabolites resulting from tracer studies

1977 ◽  
Vol 167 (2) ◽  
pp. 505-507 ◽  
Author(s):  
G H Walker ◽  
D E Hathway
Keyword(s):  
Carboxylic Acid ◽  
Electrochemical Analysis ◽  
Acid Biosynthesis ◽  
Tracer Studies ◽  
Aliphatic Carboxylic Acid ◽  
Carboxylic Acid Groups ◽  
Acid Metabolites ◽  
Kolbe Reaction ◽  
Aliphatic Carboxylic Acids ◽  
Important Evidence

14C02 output from carboxy-14C-labelled aliphatic carboxylic acids is measured in the micro-scale Kolbe reaction. Irrespective of whether rats were dosed with 1,1-dichloro[1-14C]ethylene or with chloro[1-14C]acetic acid, 1 mol.equiv. of the resulting thio[14C]diglycollic acid yields by electrolysis approx. 0.7 equiv. of 14CO2, which is interpreted in terms of the labelling of one of the carboxylic acid groups of thiodiglycollic acid. This observation provides important evidence concerning thiodiglycollic acid biosynthesis from 1.1-dichloroethylene.

Aliphatic Sulfonyl Fluoride Synthesis via Reductive Decarboxylative Fluorosulfonylation of Aliphatic Carboxylic Acids NHPI Esters

2022 ◽  
Author(s):  
Zhanhu Ma ◽  
Yongan Liu ◽  
Xiaoyu Ma ◽  
Xiaojun Hu ◽  
Yong Guo ◽  
...  
Keyword(s):  
Carboxylic Acid ◽  
Sulfur Dioxide ◽  
Carboxylic Acids ◽  
Efficient Method ◽  
Aliphatic Carboxylic Acids ◽  
Sulfonyl Fluoride

Based on radical sulfur dioxide insertion and fluorination strategy, we have developed an efficient method for aliphatic sulfonyl fluoride synthesis from abundant carboxylic acid, reductant, sulfur dioxide surrogate and electrophilic...

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