Benzophenon‐photoinduzierte Oxydationen von Benzylarylethern und aromatischen Lösungsmitteln

Abstract

Benzophenone Photoinduced Oxidation of Benzyl Aryl Ether and Aromatic Solventsα‐Ether radicals formed in the photoreaction of benzophenone with benzyl phenyl ether were oxidized in benzene solution to phenol, benzaldehyde and phenylbenzoate. A mechanism including an instable intermediate α‐ether hydroperoxide is discussed with the help of kinetic and CIDNP results. The quantum yields of the oxygen consumption show a linear dependence on the ether concentration. They are much higher in the pure solvent benzene than expected from the quenching and deactivation processes. This agrees with the existence of a biradicalic adduct of triplet benzophenone with aromatic solvents and shows that these solvents are far from being inert under these conditions.