The 12-si-methyl group of vitamin B12, unique among the eight C-methyl groups of the vitamin in originating from an acetate residue by decarboxylation, is shown to be formed with overall retention of configuration.
A. R. Battersby, K. R. Deutscher and B. Martinoni, J. Chem. Soc., Chem. Commun., 1983, 698 DOI: 10.1039/C39830000698
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