Oxidation of Thiols. IV. The Effect of Substituents on Ionization and Hexacyanoferrate (III) Oxidation of Monothiodiacylmethane

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概要

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• Ionization constants, pK_a, for a set of six monothiodiacylmethanes have been determined in 50 vol% ethanol-water mixture at 25°±0.1. Excellent linear correlations are obtained when pK_a values are plotted against the substituent constant, σ_x, and the polar substituent constant, σ^*_<xC_6H_4>, for substituted phenyl groups. The regression lines are : pK_a=8.00-1.47 σ_x and pK_a=8.92-1.195 σ^*_<xC_6H_4>, respectively. The pK_a values are also correlated with the extended Hammett equation. The correlation follows the equation : pK_a=7.717-1.330σ_<I, x>-1.248σ_<R, x> The rate of the oxidation of (Ie) with hexacyanoferrate (III) was discussed at different pH values.

• 公益社団法人日本薬学会の論文
• 1979-03-25

著者

• Kassim Ahmad

  Department Of Chemistry Kuwait University

• Al-hajjar Farouk

  Department Of Chemistry Kuwait University

関連論文

• Oxidation of Thiols. IV. The Effect of Substituents on Ionization and Hexacyanoferrate (III) Oxidation of Monothiodiacylmethane

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