Porphycene, a structural isomer of porphyrin, reacts with the Vilsmeier reagent (DMF–POCl3) to give a one-carbon bridge between two pyrrolic nitrogens; this new structure is characterized by NMR and X-ray crystallography.
C. K. Chang, I. Morrison, W. Wu, S. Chern and S. Peng, J. Chem. Soc., Chem. Commun., 1995, 1173 DOI: 10.1039/C39950001173
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