Dimethyldioxirane epoxidation of benzofurans: Reversible thermal and photochemical valence isomerization between benzofuran epoxides, quinone methides, and benzoxetenes

Article abstract of DOI:10.1021/ja00072a012

Low-temperature oxidation of the four possible regioisomeric methoxy-substituted benzofurans 1 by dimethyldioxirane afforded the rather labile epoxides 2, which are in equilibrium with their equally labile quinone methides 3 through reversible valence iso