The deuterium noise-decoupled 13C n.m.r. spectrum of dicyanocobalamin (5) biosynthesised from [methyl-13CD3]methionine shows intact incorporation of seven methyl groups into the macrocycle of vitamin B12 without exchange of D with H of the medium.
A. Battersby, R. Hollenstein, E. McDonald and D. C. Williams, J. Chem. Soc., Chem. Commun., 1976, 543 DOI: 10.1039/C39760000543
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