The biosynthesis of vitamin B12 is studied by 13C-spectroscopy on the derived heptamethyl ester (4); work with amino[5-13C]lavulinic acid and [Me-13C]- methionine confirms that seven peripheral methyl groups are derived from methionine and proves that one of these is the pro-R methyl group on ring c.
A. R. Battersby, M. Ihara, E. McDonald, J. R. Stephenson and B. T. Golding, J. Chem. Soc., Chem. Commun., 1973, 404 DOI: 10.1039/C39730000404
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