Rw. Boyle et D. Dolphin, 5,15-DIPHENYL-7-OXOBENZOCHLORINS - NOVEL LONG-WAVELENGTH ABSORBING PHOTOSENSITIZERS FOR PHOTODYNAMIC THERAPY, Journal of the Chemical Society, Chemical Communications, (21), 1994, pp. 2463-2464
Copper(II)-5,15-diphenylporphyrin 1 is converted to 5,15-diphenyl-7-ox
obenzochlorin 3 (M = 2H) by a modified Vilsmeier formylation, BF3-cata
lysed cyclization, oxidation and demetallation.