Abstract
Abstract It has been confirmed by paper chromatography that peroxybenzoic acid in acetic acid is transformed reversibly to acetyl benzoyl peroxide in the presence of a catalytic amount of sulfuric acid. The rate satisfies the first order equation for reversible reactions. The plot of the logarithm of the forward rate constant vs. the acidity function has given a straight line with a slope of −0.96. The rate decreases upon the introduction of an electronattracting group to the benzene ring of peroxybenzoic acid, the Hammett’s ρ-value being −0.37. A mechanism analogous to that postulated previously with peroxyacetic acid, which involves a rate-determining attack of protonated acetic acid on peroxybenzoic acids, is consistent with these facts.
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