Effect of medium on dissociation of carboxylic acids

1985 ◽  
Vol 50 (12) ◽  
pp. 2670-2678 ◽  
Author(s):  
Jiří Mollin ◽  
Zdeněk Pavelek ◽  
Jitka Navrátilová ◽  
Alena Recmanová
Keyword(s):  
Benzoic Acid ◽  
Organic Solvent ◽  
Carboxylic Acids ◽  
Ion Transfer ◽  
Electrostatic Forces ◽  
Two Component ◽  
Born Equation

pK Values of carboxylic acids have been measured in mixtures water-organic solvent and confronted with the Born equation. Solubilities of benzoic acid have been measured. From the pK and solubilities found the ΔGt0(C6H5COO-) values have been calculated for various two-component solvents. The results agree with the idea that the ion transfer into another medium is affected not only by electrostatic, but also by non-electrostatic forces.

ChemInform Abstract: Synthesis of Primary Amides by Lipase-Catalyzed Amidation of Carboxylic Acids with Ammonium Salts in an Organic Solvent.

ChemInform ◽  
2010 ◽  
Vol 30 (45) ◽  
pp. no-no
Author(s):  
Mike J. J. Litjens ◽  
Adrie J. J. Straathof ◽  
Jaap A. Jongejan ◽  
Joseph J. Heijnen
Keyword(s):  
Organic Solvent ◽  
Carboxylic Acids ◽  
Ammonium Salts

Generation of Chirality in Two-Component Molecular Crystals of Tryptamine and Achiral Carboxylic Acids

1999 ◽  
Vol 64 (11) ◽  
pp. 3916-3921 ◽  
Author(s):  
Hideko Koshima ◽  
Shinji Honke ◽  
Junko Fujita
Keyword(s):  
Carboxylic Acids ◽  
Molecular Crystals ◽  
Two Component

Simultaneous Gas Chromatographic Determination of Carboxylic Acids in Soft Drinks and Jams

1985 ◽  
Vol 68 (5) ◽  
pp. 902-905
Author(s):  
Taizo Tsuda ◽  
Hiroshi Nakanishi ◽  
Takashi Morita ◽  
Junko Takebayashi
Keyword(s):  
Benzoic Acid ◽  
Succinic Acid ◽  
Tartaric Acid ◽  
Carboxylic Acids ◽  
Fumaric Acid ◽  
Malic Acid ◽  
Sorbic Acid ◽  
Chromatographic Determination ◽  
Dehydroacetic Acid

Abstract A method was developed for simultaneous gas chromatographic determination of sorbic acid, dehydroacetic acid, and benzoic acid used as preservatives, and succinic acid, fumaric acid, malic acid, and tartaric acid used as acidulants in soft drinks and jams. A sample was dissolved in NH4OH-NH4CI pH 9 buffer solution, and an aliquot of the solution was passed through a QAE-Sephadex A 25 column. The column was washed with water, and the carboxylic acids were eluted with 0.1N HC1. Sorbic acid, dehydroacetic acid, and benzoic acid were extracted with ethyl ether-petroleum ether (1 + 1), and determined on a 5% DEGS + 1% H3PO4 column. Succinic acid, fumaric acid, malic acid, and tartaric acid in the lower layer were derivatized with N,0- bis(trimethylsilyl)acetamide and trimethylchlorosilane, and determined on a 3% SE-30 column. Recoveries from soft drink and jam samples fortified with 0.1% each of 7 carboxylic acids ranged from 92.4 to 102.6% for preservatives, and from 88.1 to 103.2% for acidulants.

The effect of ethylenediaminetetraacetate and its calcium chelate on the rate of swelling of a strain of Pseudomonas aeruginosa in salt solutions

1972 ◽  
Vol 18 (11) ◽  
pp. 1643-1646
Author(s):  
Frederick Bernheim
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Carboxylic Acids ◽  
Salt Solutions ◽  
Electrostatic Forces ◽  
Anionic Sites ◽  
Barium Strontium ◽  
Sites Of Action

When washed suspensions of Pseudomonas aeruginosa are placed in salt solutions, the cells shrink rapidly and then swell more slowly as salt and water enter them. The rate of swelling is increased by EDTA and its calcium chelate. The effect of EDTA is antagonized by diamines; the effect of the calcium chelate by carboxylic acids. The relative effects of EDTA and the calcium chelate differ in different salts which suggests different sites of action. The evidence indicates that EDTA does not act by chelating calcium or magnesium in the membrane of these cells but that its two nitrogen atoms combine by electrostatic forces with anionic sites, and the chelate, in which the nitrogen atoms are bound to calcium, combines by the same forces to cationic sites. Barium, strontium, and magnesium chelates are inactive.

scholarly journals 3-Carboxyphenylboronic acid–theophylline (1/1)

2012 ◽  
Vol 68 (8) ◽  
pp. o2320-o2320 ◽  
Author(s):  
Ventsi Dyulgerov ◽  
Rositsa P. Nikolova ◽  
Louiza T. Dimova ◽  
Boris L. Shivachev
Keyword(s):  
Hydrogen Bonds ◽  
Benzoic Acid ◽  
Molecular Crystal ◽  
Molar Ratio ◽  
Π Interactions ◽  
Centroid Distance ◽  
Two Component ◽  
Self Assembled

The title two-component molecular crystal [systematic name: 3-(dihydroxyboranyl)benzoic acid–1,3-dimethyl-7H-purine-2,6-dione (1/1)], C7H7BO4·C7H8N4O2, comprises theophylline and 3-carboxyphenylboronic acid molecules in a 1:1 molar ratio. In the crystal, molecules are self-assembled by O—H...O and N—H...N hydrogen bonds, generating layers parallel to (-209). The layers are stacked through π–π [centroid–centroid distance = 3.546 (2) Å] and C—H...π interactions.

scholarly journals o-Iodoxy Benzoic Acid–Mediated Synthesis of 3,5-Diarylisoxazoles and Isoxazole-3-carboxylic Acids

2014 ◽  
Vol 44 (10) ◽  
pp. 1453-1460 ◽  
Author(s):  
Vidya G. Desai ◽  
Sneha R. Naik ◽  
Kashinath L. Dhumaskar
Keyword(s):  
Benzoic Acid ◽  
Carboxylic Acids

Inhibitors of the geotropic response in plants. The crystal structures of 2-[(Naphthalen-2-yl)carbamoyl]benzoic acid (β-Naptalam), 2-(Phenylcarbamoyl)-benzoic acid and 2-(5-Phenyl-1,3,4-oxadiazol-2-yl)benzoic acid

1983 ◽  
Vol 36 (12) ◽  
pp. 2455 ◽  
Author(s):  
G Smith ◽  
CHL Kennard ◽  
GF Katekar
Keyword(s):  
Hydrogen Bonding ◽  
Carboxylic Acid ◽  
Benzoic Acid ◽  
Crystal Structures ◽  
Carboxylic Acids ◽  
Intermolecular Hydrogen Bonding ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carboxylic Acid Groups ◽  
Phthalamic Acid

The crystal structures of three geotropically active phthalamic acid derivatives have been determined by means of X-ray diffraction and the structural systematics for the series compared. The three acids are conformationally similar and, in contrast to the tendency among carboxylic acids to form hydrogen-bonded dimers, they exist as monomers with intermolecular hydrogen bonding between the carboxylic acid groups and the nitrogen or oxygen of the amide side chains.

Sign in / Sign up

Export Citation Format

Share Document