Abstract
Ionization constants, pKa, 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 pKa values are plotted against the substituent constant, σx, and the polar substituent constant, σ*xC6H4, for substituted phenyl groups. The regression lines are : pKa=8.00-1.47 σx and pKa=8.92-1.195 σ*xC6H4, respectively. The pKa values are also correlated with the extended Hammett equation. The correlation follows the equation : pKa=7.717-1.330σI, x-1.248σR, x The rate of the oxidation of (Ie) with hexacyanoferrate (III) was discussed at different pH values.
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