SCHEDULED MAINTENANCE
Intramolecular cyclization of porphyrins substituted with either propanoic or butanoic acid side chains led to the formation of the cyclic ketones (3c) and (4d) from which the petroporphyrins (3b) and (4c) were obtained; treatment of (4c) under acidic conditions did not result in rearrangement of the seven membered exocyclic ring.
P. S. Clezy, C. J. R. Fookes and J. K. Prashar, J. Chem. Soc., Chem. Commun., 1988, 83 DOI: 10.1039/C39880000083
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