Synthesis, structure and Co–C bond homolysis of an intramolecularly bridged (tetrahydrofurfuryl)cobalt(salen) complex: a simple model of enzyme-bound coenzyme B12
Abstract
Air oxidation of a CoII(salen) derivative, whose ethanediyl moiety carries a methylene-linked 4-hydroxypent-1-en-3-yl substituent, yields an intramolecularly bridged (tetrahydrofurfuryl)CoIII(salen) complex of which the crystal structure has been determined; this B12 model is very resistant to Co–C bond homolysis, even in the presence of a large excess of the radical trap TEMPO.