PdII insertion-triggered meso-carbon extrusion of N-fused pentaphyrin to form N-fused sapphyrin PdII complexes

Abstract

meso-Carbon extrusion of N-fused [22]pentaphyrin(1.1.1.1.1) occurred upon its Pd^II complexation, giving N-fused [22]pentaphyrin (1.1.1.1.0) ([22]sapphyrin) Pd^II complexes 5 and 6 as 22π aromatic compounds. Oxidation of 5 with DDQ and Sc(OTf)₃ gave directly C–N linked dimer 7.