A compound with a cobalt–carbon bond, which was found as the key intermediate in the B 12 (cobalamin derivative)-dependent enzymic reaction, is a useful reagent for the generation of an organic radical species. 1 The cobalt–carbon bond can be homolytically cleaved by photolysis, electrolysis or thermolysis to form Co(II) and the corresponding radical species. 2 Therefore, application of the alkylated complex for the radical-mediated organic synthesis ...