First example of intramolecular photochemical oxygen migration from benzotrithiole 2-oxides to benzotrithiole 1-oxides

Article abstract of DOI:10.1016/S0040-4039(00)61649-0

Irradiation of 4,8-dialkylbenzo[1,2-d;4,5-d']bis[1,2,3]trithiole 2-oxides (2) in acetonitrile with a high pressure mercury lamp gave 4,8-dialkylbenzo[1,2-d;4,5-d']bis[1,2,3]trithiole 1-oxides (3) quantitatively. The present photochemical oxygen migration of 2 and related sulfoxides were shown to proceed intramolecularly via an excited singlet state by ¹⁸O-labeled, cross-over, and triplet quencher experiments.