A sigmatropic methyl shift from the angular position C-1 in ring A to the meso position C-20 between rings A and D constitutes the crucial step in syntheses leading to a 20-methyl-isobacteriochlorin and to 20-methyl-pyrrocorphins which served as substrates in the investigation presented in the accompanying communication.
K. Hilpert, C. Leumann, A. P. Davis and A. Eschenmoser, J. Chem. Soc., Chem. Commun., 1983, 1401 DOI: 10.1039/C39830001401
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