A Purification of meso-Tetraphenylporphyrin
Rousseau, K. and David Dolphin
The title compound (I), prepared from PhCHO and pyrrole in EtCO2 H, contains tetraphenylchlorin (II). Small quantities, <1 g, of the mixture were purified by chromatography on dry alumina. Larger quantities were purified by oxidation by 2,3-dichloro-5,6-dicyanobenzoquinone, chemical removal of excess quinone and quinol by extraction with Na dithionite-NaOH, and crystalization of pure I, from CH 2Cl2/MeOH.