A Pyrrolophanediene‐Porphycene Redox System

Abstract

In analogy to the isophlorines discussed by Woodward, N,N′-dihydroporphycenes should be regarded as [4n]annulenes, which explains their extremely facile oxidation to the aromatic porphycenes. Compound 1 is the first example of an N,N′-dihydroporphycene to be synthesized. The phane-like, colorless 1 and the deep violet, planar 2 constitute a redox system.