Kinetics of cyclohexene oxidation by p-quinones in aqueous-organic solutions of cationic palladium(II) complexes

Abstract

A kinetic study of cyclohexene oxidation by p -quinones in water-acetonitrile solutions of cationic Pd(II) complexes has been carried out for the first time. The observed kinetic regularities (dependence of the initial rate on the HClO 4 and p -benzoquinone concentrations) and the shape of the kinetic curves differ radically from those for the chloride systems. The unsteady-state process can be described only under the assumption that complexes of reduced palladium species with quinones are catalytically active forms. The role of solvated palladiumcarbenium ions in particular steps of the mechanism is discussed.