Visible Light-Driven, Copper-Catalyzed Aerobic Oxidative Cleavage of Cycloalkanones.

A visible light-driven, copper-catalyzed aerobic oxidative cleavage of cycloalkanones has been presented. A variety of cycloalkanones with varying ring sizes and various α-substituents reacted well to give the distal keto acids or dicarboxylic acids with moderate to good yields.