[3+2] Photooxygenation of aryl cyclopropanes via visible light photocatalysis

Abstract We report that Ru ( bpz ) 3 2 + is an excellent sensitizer for the photooxygenation of aryl cyclopropanes upon irradiation with visible light. The effectiveness of this photocatalyst enables the synthesis of a range of five-membered endoperoxides in excellent yield with quite low (0.5 mol %) catalyst loadings even when standard household light sources are utilized.