Rate correlations involving the linear combination of substituent parameters. Part I. Hydrolysis of aryl acetates

Abstract

The alkaline hydrolysis of m- and p-substituted phenyl acetates has been followed conductimetrically. Specific rates, activation energies, and activation entropies have been evaluated. The rates for electron-withdrawing p-substituents correlate better with a 4 parameter equation involving σ and σ^– than with the standard Hammett equation. σ and σ^– values for the –CHNPh and –NCHPh groups are reported.