Hydrogen isotope exchange in ortho-alkyl-phenyl ketones mediated by illuminated semiconductor powders

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Abstract
Photocatalysed hydrogen isotope exchange between o-methylbenzophenone, o-methylacetophenone or 5,8-dimethyl-α-tetralone and deuterium or tritium labelled alcohols has been studied in suspensions containing inorganic semiconductors (CdS. ZnO and TiO2). It has been shown that adsorption of the ketone onto the semiconductor surface is necessary for the exchange reaction to occur. The influence of the electron scavenger (CBr4 and O2) and the hole scavenger (1,3,5-trimethoxybenzene) on the reaction yield has been examined. A mechanism of the studied reaction is proposed.