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Reactions of the Carbon-Cobalt Bond of Alkylcobalamins

A REVERSIBLE DISSOCIATION OF THE CARBON-COBALT BOND

R. Barnett 1, H. P. C. Hogenkamp 1, and R. H. Abeles 1

From the 1 From the Graduate Department of Biochemistry, Brandeis University, Waltham, Massachusetts 02154, and the Department of Biochemistry, College of Medicine, The University of Iowa, Iowa City, Iowa

The carbon-cobalt bond in cyanoethylcobalamin can be reversibly cleaved to give hydridocobalamin and acrylonitrile. Aerobic decomposition in alkali is first order in both hydroxide ion and cyanoethylcobalamin, although the kinetics is somewhat ambiguous below pH 9. This is the first demonstrated example of alkyl-cobalt cleavage in which the cobalt leaves with the bonding electrons.

Submitted on November 1, 1965


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