SCHEDULED MAINTENANCE
Treatment of π-cation radicals of magnesium(II) and cadmium(II) octa-alkylporphyrins with sodium nitrite affords good yields of meso-mononitroporphyrins after demetallation; with zinc(II)trans-octaethylchlorin, meso-substitution occurs adjacent to the partially reduced ring.
G. H. Barnett and K. M. Smith, J. Chem. Soc., Chem. Commun., 1974, 772 DOI: 10.1039/C39740000772
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