Tetra‐<i>p</i>‐tolylporphyrin with an Inverted Pyrrole Ring: A Novel Isomer of Porphyrin

Abstract

Exchange of a β-methine unit for an N atom of a pyrrole ring of a porphyrin leads to a new type of porphyrin isomer, which is formed by condensation of pyrrole and P-tolylaldehyde. NiII ions are surprisingly coordinated by 1 as tetradentate ligand, that is through the three N atoms and the C atom of the inner cycle. The framework of the green metalloporhyrin is planar.