Kinetics of the Tungstate-catalyzed H2O2 Oxidation of Amines in Aqueous Methanol. Acidity Effect

Oxidation of N,N-dimethylaniline and benzylamine with H2O2 catalyzed by Na2WO4 has been kinetically studied in buffered 50% aqueous methanol at 25 °C. The rates with a catalytic amount of Na2WO4fit Eq.: v=k[amine]t[Na2WO4]t[H2O2]0 and the pH profile of rate constant shows no dissociation of peroxotungstate at pH 5–10. N,N-Dimethylaniline gives N-oxide (73%) and benzylamine gives benzaldehyde oxime (65%) under the present kinetic conditions.