meso-Acrylic derivatives of octaethylporphin may be cyclised by acids either to purpurin derivatives (5) or to a novel modified porphin containing a fused benzene ring (7), depending on the presence or absence of metal and the experimental conditions.
D. Arnold, R. Gaete-Holmes and A. W. Johnson, J. Chem. Soc., Chem. Commun., 1978, 73 DOI: 10.1039/C39780000073
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