Subpyriporphyrin was obtained by R. Myśliborski in an attempt to synthesize a pyridine containing expanded porphyrin.
Subpyriporphyrin is a novel type of contracted porphyrin - a homologue of triphyrin(1.1.1) with a pyridine moiety embedded in the macrocyclic framework. X-ray crystal structure analysis showed that macrocycle is slightly ruffled.
Myśliborski, R.; Latos-Grażyński, L.; Szterenberg, L.; Lis, T. Subpyriporphyrin - A Triphyrin(1.1.1) Homologue with an Embedded Pyridine Moiety Angew. Chem. Int. Ed. 2006, 45, 3670.
(See the complete publication list of our group.)