Photo-oxidation of metal octaphenyltetrazaporphin pigments gave phenanthrenedicarboximide (VI). The initial oxidation of the magnesium analogue was reversible and the metal-free pigment was also isolated on irradiation of solutions of this pigment. Some tetraphenanthrotetrazaporphin pigments have been synthesised and their structures have been proved by oxidation to give phenanthrenedicarboximide.
E. V. Blackburn and C. J. Timmons, J. Chem. Soc. C, 1970, 175 DOI: 10.1039/J39700000175
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