Effect of Substituents on TiO <sub/>2</sub> Photocatalytic Oxidation of <i>trans</i> -Stilbenes

摘要： Photocatalytic reaction of trans-stilbene on TiO2 particles in acetonitrile-water mixed solvent produces benzaldehyde with high selectivity. Introduction of electron-donating substituents to the benzene rings accelerated the reaction. On the other hand, the rate was decelerated by electron-withdrawing substituents. These results suggest that the reaction proceeds by hydroperoxo or hydroperoxy, which were formed on TiO2 surface by UV irradiation, rather than free OH radicals.