SCHEDULED MAINTENANCE
The proportion of electrophilic deuteriation at individual meso positions in unsymmetrically substituted porphyrins depends upon the nature of the substituents on the adjacent pyrrolic subunits; in the case of protoporphyrin-IX, these observations allow the first unequivocal assignment of all four meso protons in the n.m.r. spectrum of dicyanoferriprotoheme.
K. M. Smith, K. C. Langry and J. S. de Ropp, J. Chem. Soc., Chem. Commun., 1979, 1001 DOI: 10.1039/C39790001001
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