The cobalamin derivative (B 12 ) is a cobalt complex with a tetrapyrrole ring system (corrin ring) that has emerged in a variety of enzymes such as methylmalonyl CoA mutase, methionine synthase and reductive dehalogenase. 1 Inspired by the unique functions of these enzymes, various catalytic reactions have already been reported using a B 12 model complex such as the 1,2-migration of a functional group, dechlorination of organic chlorides, methylation of ...
