Surface photochemistry: the photolysis of α-methoxy acetophenones on silica gel

The photolysis of α-methoxy acetophenones 1a–1e adsorbed on silica gel show a significant deviation from the course of reaction in methanol. The results are discussed in terms of conformational control and restricted movement of the radical through adsorption on silica gel. Factors affecting the efficiency of modification of photochemical reactivity on silica gel surface have been examined.