The photochemical and oxidative cyclodehydrogenation reactions of tetraphenylpyrroles act in a complementary fashion for the cyclisation of N-ethyl and N-benzyl derivatives. In the case of the former, a doubly cyclised product was isolated from cyclisation with solid FeCl3, while the latter gives a rearranged 3H-pyrrole upon irradiation.
J. L. Ferguson, M. A. Squire and C. M. Fitchett, Org. Biomol. Chem., 2017, 15, 9293 DOI: 10.1039/C7OB02537H
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