Reaction of metallo-2-nitro-5,10,15,20-tetraphenylporphyrins with ‘active-methylene’ compounds (e.g. malonates, malononitriles) in the presence of base gives access to novel cyclopropachlorins or functionalized trans-chlorins (both characterized by X-ray crystallography) by way of a sequential Michael addition and rare nucleophilic displacement of a secondary nitro group.
L. Jaquinod, C. Gros, R. G. Khoury and K. M. Smith, Chem. Commun., 1996, 2581 DOI: 10.1039/CC9960002581
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