The primary and β-secondary kinetic isotope effects in the oxidation of secondary alcohols with dimethyl dioxirane were measured. The substantial primary and the absence of a β-secondary kinetic isotope effect support a concerted mechanism for the title reaction. ... Concerted mechanism for the DMD oxidation of alcohols. Concerted mechanism for the DMD oxidation of alcohols. ... Concerted mechanism for the DMD oxidation of alcohols. ... Baumstark and Kovăc, ...