The title compounds have been synthesized, for the first time, from the corresponding 1,19-dimetyl-, 1-methyl-19-iodo-, and 1,19-di-iodo-biladiene-ac derivatives respectively, by means of methods described earlier. The 1,19-di-iodobiladienes-ac could be cyclized, in the presence of sodium azide, to the corresponding 20-azaporphyrins.
J. Engel, A. Gossauer and A. W. Johnson, J. Chem. Soc., Perkin Trans. 1, 1978, 871 DOI: 10.1039/P19780000871
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