ELECTROCHEMICAL DEHALOGENATION REACTION OF DDT MEDIATED BY HYDROPHOBIC VITAMIN B_(12)

摘要

The controlled-potential electrolysis of 1,1-bis(4-chlorophenyl)-2,2,2-trichloroethane (DDT) was carried out in the presence of a hydrophobic vitamin B_(12), heptamethyl cobyrinate perchlorate. DDT was dechlorinated to form 1,1-bis(4-chlorophenyl)-2,2-dichloroethane (DDD), 1,1-bis(4-chlorophenyl)-2,2-dichloroethylene (DDE), 1-chloro-2,2-bis(4-chlorophenyl)ethylene (DDMU) and 1,1,4,4-tetrakis(4-chlorophenyl)-2,3-dichloro-2-butene (TTDB) (E/Z), and quantitative recovery of the catalyst after the electrolysis was confirmed by the electronic spectroscopy. A photo-sensitive intermediate having a cobalt-carbon bond formed during the electrolysis was characterized by the electronic spectroscopy. The mechanism for the formation of various dehalogenated products was investigated by various spectroscopic methods.