25234-25-7Relevant articles and documents
Mild, single-pot hydrocarboxylation of linear C5-C9 alkanes into branched monocarboxylic C6-C10 acids in copper-catalyzed aqueous systems
Kirillova, Marina V.,Kirillov, Alexander M.,Pombeiro, Armando J.L.
experimental part, p. 106 - 113 (2012/04/04)
A single-pot method has been developed for the hydrocarboxylation of the liquid C5-C9 alkanes (n-pentane, n-hexane, n-heptane, n-octane, n-nonane and 3-methylhexane) into the branched monocarboxylic C 6-C10 acids bearing one more carbon atom. This method is characterized by a direct, selective and low-temperature (60 °C) hydrocarboxylation reaction of the alkane with carbon monoxide, water (which acts as a reagent besides being a solvent component) and potassium peroxodisulfate, in H2O/MeCN medium. The hydrocarboxylations are markedly enhanced in the presence of a tetracopper(II) triethanolaminate complex as a homogeneous catalyst precursor. Total yields (based on alkane) of carboxylic acids up to 46% (with 97-99% overall selectivity) have been achieved, which are remarkable in the field of alkane functionalization under mild conditions, especially for a C-C bond formation reaction in aqueous acid-solvent-free medium. The regio- and bond selectivity parameters have been determined and a free radical mechanism has been proposed.
Alkanoyl ester compounds and their intermediates and method of producing the same
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, (2008/06/13)
This invention provides a novel alkanoyl ester compound represented by general formula (I): STR1 (wherein A is of --, --O--, STR2 B is STR3 l and m are 1 or 2 provided that both are not simultaneously 2, k and n are an integer of 1 or more, respectively, provided that k>n, and R is an alkyl group), a liquid crystal composition containing this compound, a novel alkanoylphenyl compound or a novel alkanoylbiphenyl compound as an intermediate for the production of the above compound, and a method of producing the same. These novel alkanoyl ester compounds are excellent in the stability against light and the like and can take a liquid crystal state at a wide temperature range. Particularly, these compounds form liquid crystals of ferroelectricity having a large spontaneous polarization and a fast response rate by introducing an optically active group into the compound, so that they develop a very excellent effect as a starting material for optoelectronics and its related elements.
Oxidation of acetoxyalkyl radicals by divalent copper salts
Katsin,Ogibin,Nikishin
, p. 129 - 133 (2007/10/12)
1. The 1-ethyl-3-aeetoxypropyl and 1-ethyl-4-acetoxybutyl radicals were respectively generated by the oxidative decarboxylation of the 2-ethyl-3-acetoxybutanoic and 2-ethyl-4-acetoxypentanoic acids under the influence of lead tetraacetate, and a study was made of their oxidation by the acetate, trifluoroacetate, fluoborate, sulfate, chloride and perchlorate of divalent copper. 2. Most of the copper salts oxidize the 1-ethyl-3-acetoxypropyl and 1-ethyl-4-acetoxybutyl radicals exclusively to the 2- and 3-pentenyl and the 3- and 4-hexenyl acetates, with the predominant formation of the isomers where the acetoxy group is furthest away from the double bond. Ligands that are coordinated with the copper are practically without effect on the ratio of the formed isomeric alkenyl acetates.