Dechlorination of 1,1-bis(4-chlorophenyl)-2,2,2-trichloroethane (DDT) was catalyzed by a hydrophobic vitamin B12, heptamethyl cobyrinate perchlorate, with a visible light irradiation system containing a [Ru(II)(bpy)3]Cl2 photosensitizer, and the hydrophobic vitamin B12 showed high catalytic efficiency and stability during the reaction.
