One of the minor products from the previously described peripheral C-methylation of a magnesium(II)-20-methyl-D-pyrrocorphinate is a C-19-methylated 19,20-seco-corphinoid derivative which, on complexation with nickel(II) acetate, recyclizes to a nickel(II)-tetradehydro-corrinate.
C. Leumann and A. Eschenmoser, J. Chem. Soc., Chem. Commun., 1984, 583 DOI: 10.1039/C39840000583
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