Carboxylic acid

About: Carboxylic acid is a research topic. Over the lifetime, 48544 publications have been published within this topic receiving 605696 citations.

NMR assignments of the major cannabinoids and cannabiflavonoids isolated from flowers of Cannabis sativa.

Abstract: The complete 1H- and 13C-NMR assignments of the major Cannabis constituents, delta9-tetrahydrocannabinol, tetrahydrocannabinolic acid, delta8-tetrahydrocannabinol, cannabigerol, cannabinol, cannabidiol, cannabidiolic acid, cannflavin A and cannflavin B have been determined on the basis of one- and two-dimensional NMR spectra including 1H- and 13C-NMR, 1H-1H-COSY, HMQC and HMBC The substitution of carboxylic acid on the cannabinoid nucleus (as in tetrahydrocannabinolic acid and cannabidiolic acid) has a large effect on the chemical shift of H-1" of the C5 side chain and 2'-OH It was also observed that carboxylic acid substitution reduces intermolecular hydrogen bonding resulting in a sharpening of the H-5' signal in cannabinolic acid in deuterated chloroform The additional aromaticity of cannabinol causes the two angular methyl groups (H-8 and H-9) to show identical 1H-NMR shifts, which indicates that the two aromatic rings are in one plane in contrast to the other cannabinoids For the cannabiflavonoids, the unambiguous assignments of C-3' and C-4' of cannflavin A and B were determined by HMBC spectra

Metabolic activation of carboxylic acids.

Abstract: Background: Carboxylic acids constitute a large and heterogeneous class of both endogenous and xenobiotic compounds. A number of carboxylic acid drugs have been associated with adverse reactions, linked to the metabolic activation of the carboxylic acid moiety of the compounds, i.e., formation of acyl-glucuronides and acyl-CoA thioesters. Objective: The objective is to give an overview of the current knowledge on metabolic activation of carboxylic acids and how such metabolites may play a role in adverse reactions and toxicity. Methods: Literature concerning the formation and disposition of acyl glucuronides and acyl-CoA thioesters was searched. Also included were papers on the chemical reactivity of acyl glutathione-thioesters, and literature concerning possible links between metabolic activation of carboxylic acids and reported cellular and clinical effects. Results/conclusion: This review demonstrates that metabolites of carboxylic acid drugs must be considered chemically reactive, and that the current...

Direct hydrogenation of carboxylic acids to alcohol and esters

Abstract: This invention provides an improved process for direct hydrogenation of a carboxylic acid to its corresponding alcohol with synthesis gas in the presence of a homogeneous catalyst comprising a ruthenium compound and a Lewis Acid metal halide.

Chiral compounds from bacterial polyesters: Sugars to plastics to fine chemicals

Abstract: A novel and efficient method for the production of enantiomerically pure (R)-(-)-hydroxycarboxylic acids by in vivo depolymerization of microbial polyester polyhydroxyalkanoates (PHAs) was developed. Using this method, several model compounds, (R)-(-)-3-hydroxyalkanoic acids, consisting of 4 to 12 carbon atoms, and (R)-(-)-3-hydroxy-5-phenylvaleric acid, could be prepared. In particular, (R)-(-)-3-hydroxybutyric acid could be efficiently prepared by this method. By providing the environmental condition in which cells possess high activity of intracellular PHA depolymerase and low activity of (R)-(-)-3-hydroxybutyric acid dehydrogenase, (R)-(-)-3-hydroxybutyric acid could be produced with a yield of 96% in only 30 min by in vivo depolymerization of polyhydroxybutyrate (PHB) accumulated in Alcaligenes latus.

5-oxo-pyrrolidine-2-carboxylic acid hydroxamide derivatives

Abstract: The present invention relates to a compound of the formula ##STR1## wherein R 1 , R 2 , R 3 are as defined above, to pharmaceutical compositions and methods of treatment.