title: Regioselective pyridination of m-benziporphyrin.
abstract: [reaction: see text] Reaction of tetraaryl-m-benziporphyrin with pyridine and silver tetrafluoroborate yields 22-pyridiniumyl-m-benziporphyrin as the only substitution product. This compound is further rearranged to a fused m-benziphlorin containing a 4a-azafluorene fragment. A mechanism involving a high-valent silver complex is proposed for the pyridination reaction.
authors.affiliation: Department of Chemistry, University of Wrocław, 14 F. Joliot-Curie St., Wrocław 50 383, Poland.
authors.forename: Marcin
authors.initials: M
authors.lastname: Stepień
authors.forename: Lechosław
authors.initials: L
authors.lastname: Latos-Grazyński