N.m.r. studies on 13C-labelled trimethylisobacteriochlorin from the B12-producer P. shermanii confirm C-methylation at C-20 and it is shown by 3H–14C double labelling that this C-20 methyl group is lost during contraction of the macrocycle to the corrin system.
N. G. Lewis, R. Neier, G. W. J. Matcham, E. McDonald and A. R. Battersby, J. Chem. Soc., Chem. Commun., 1979, 541 DOI: 10.1039/C39790000541
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