Compounds in the title series have been synthesised by capping mesoporphyrin-II with protected hydroquinone derivatives, deprotection, and oxidation, followed by magnesium insertion; 1H n.m.r. spectroscopy demonstrates that the metal ion is 5-co-ordinate, bound intramolecularly to a quinone carbonyl oxygen, and can accept a sixth ligand from the unhindered side.
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Ganesh et al. (1980) studied this question.