protect' the axial Co-C bond. The axial R ligand, coordinated to the upper or psite of the corrin ring, is 5'-deoxyadenosyl in B12 coenzyme (Ado-Cbl), CN in vitamin B1 (CN-Cbl), and an alkyl group in alkylcobalamins (alkyl-Cbl). The benzimidazole residue is coordinated to cobalt in the lower or a-site. A second organocobalamin, Me-Cbl, is also an important cofactor for many enzymic processes. CN-Cbl serves as a metabolic precursor for both coenzymes. Their
Structural Effects of the Co-ordination of Quadridentate Schiff Bases t o Transition-metal Atoms. Structure of NN'-(o-phenylene)bis(salicylideneamine) and of its Cobalt(i1) Complex
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