A fifteen-membered tetrapyrrole macrocycle closed through an N–CH2 bond has been synthesized for the first time; chemical shifts and 15N–13C coupling constants of the 15N-enriched macrocycle as well as those of several 1,2-dipyrrylmethanes have been compared with those of ‘preuroporphyrinogen’.
A. Gossauer, W. Neidhart and A. I. Scott, J. Chem. Soc., Chem. Commun., 1983, 883 DOI: 10.1039/C39830000883
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