Voltammetric studies of the Kolbe synthesis with perfluorocarboxylic acids prepared from hexafluoropropene oxide oligomers

Carboxylic acids prepared from hexafluoropropene oxide CF₃CF₂CF₂O[CF(CF₃)CF₂O]_nCF (CF₃)COOH [n = 0, 2,5-bis(trifluoromethyl)-3,6-dioxaperfluorononanoic acid; n = 1, 2,5,8- tris(trifluoromethyl)-3,6,9-trioxaperfluorododecanoic acid], according to voltammetric data, enter the Kolbe reaction both at the Pt anode and at anodes from carbon materials in H₂O-CH₃CN and CH₃OH-CH₃CN solutions. The critical potential appreciably depends both on the anode material and on the solvent composition. Favorable effect of pyridine additions in H₂O-CH₃CN solutions is due to replacement of water molecules from the electrical double layer. The sodium ions exert a negative effect on the Kolbe synthesis.Translated from Zhurnal Obshchei Khimii, Vol. 74, No. 11, 2004, pp. 1842–1846.Original Russian Text Copyright © 2004 by Chechina, Sokolov, Tomilov.This revised version was published online in April 2005 with a corrected cover date.     

Synthesis of 3-substituted tetrahydroindol-4-one

Chemistry of Heterocyclic Compounds - A series of functionalized 4,5,6,7-tetrahydroindol-4-one derivatives containing a residue derived from β-dicarbonyl compound at position 3 were prepared...     

One-Pot Three-Component Synthesis of Polysubstituted Tetrahydroindoles

Chemistry of Heterocyclic Compounds - A series of novel fused pyrrole derivatives was synthesized by one-pot three-component reaction of β-enaminoketones, derived from cyclohexane-1,3-dione or...     

A Voltammetric Study of the Kolbe Synthesis with Perfluorinated Oxa Acids: Influence of the Structure of the Fluorocarbon Residue

The Kolbe synthesis with two perfluorinated oxa acids, perfluoro-3,7-dioxa-2-methyloctanoic and perfluorotetrahydro-α-furylacetic, was studied voltammetrically on platinum and glassy carbon anodes in water-acetonitrile and methanol-acetonitrile solutions. The influence exerted on the process by the acid concentration, degree of its neutralization, and solvent was studied. The solvent-anode system exerts a differentiating effect on the reactivity of perfluorinated acids under the conditions of the Kolbe synthesis.__________Translated from Zhurnal Obshchei Khimii, Vol. 75, No. 5, 2005, pp. 762–767.Original Russian Text Copyright © 2005 by Chechina, Tomilov, Sokolov.     

Synthesis of Polysubstituted Pyrroles by the Reaction of Enaminoketones,Arylglyoxals, and N,N-Dimethylbarbituric Acid

Chemistry of Heterocyclic Compounds - Novel pentasubstituted pyrroles containing a propanoic acid fragment in position 1 were obtained by the reaction of arylglyoxals, N,Ndimethylbarbituric and...     

Dissociation constants of polyfluorocarboxylic acids

The effect of the structure and molecular weight of fluorocarboxylic acids on their dissociation constants in acetonitrile and its mixtures with water and methanol was studied. Original Russian Text O.N. Chechina, S.V. Sokolov, V.V. Berenblit, V.A. Soshin, 2007, published in Zhurnal Prikladnoi Khimii, 2007, Vol. 80, No. 10, pp. 1741–1743.