ACTIVITY OF DIHYDROBENZOFURANOLS FROM 2-ALKOXY SUBSTITUTED BENZOPHENONES AND ETHYL-2-AROYL ARYLOXY ACETATES 1

Upon u.v irradiation 2-alkoxy substituted benzophenones 2a-f and ethyl-2-aroyl aryloxy acetates 7a-c, in acetonitrile under went intramolecular δ hydrogen abstraction by ketone triplets followed by 1,5-biradical intermediate coupling and led to a facile synthesis of solely dihydrobenzofuranols 6a-f and 11a-c in excellent yield. The presence of different substituents, which have significant effect on the rate of photocyclization of 1,5-biradicals, their reaction pathways and antimicrobial activity are contented.