Copper(II)-5,15-diphenylporphyrin 1 is converted to 5, 15-diphenyl-7-oxobenzochlorin 3(M = 2H) by a modified Vilsmeier formylation, BF3-catalysed cyclization, oxidation and demetallation.
R. W. Boyle and D. Dolphin, J. Chem. Soc., Chem. Commun., 1994, 2463 DOI: 10.1039/C39940002463
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