Biological derivation of the pro-R methyl group at C-12 of vitamin B12 from methionine is confirmed by both 13C and 2H labelling and the methyl groups at C-7 and C-12 are shown to be incorporated intact.
A. R. Battersby, M. Ihara, E. McDonald, J. R. Stephenson and B. T. Golding, J. Chem. Soc., Chem. Commun., 1974, 458 DOI: 10.1039/C39740000458
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