Abstract
Porphyrin derivatives having ring-fused structures at the periphery have been intensively investigated because of their interesting properties such as extremely red-shifted electronic absorption and unique redox behaviors based on narrow HOMO-LUMO gaps. Recently, we have succeeded in the synthesis of a novel quadruply-ring-fused porphyrin, which consisted of five-membered fused ring at the meso positions. The fused porphyrin is assumed to be formed via a palladium-catalyzed Ullmann-type coupling reaction under microwave irradiation. The porphyrin was characterized by NMR and absorption spectroscopies, mass spectrometry, and elemental analysis. Its proposed structure as well as its photochemical and redox properties will be presented.
