Synthesis and X-Ray Crystal Structure of 27-Oxa-25,29-Dithiasapphyrin: Bithiophene-containing Sapphyrins Have an Inverted Structure

Abstract
Acid-catalyzed condensation of 16-oxa-5,10,15,17-tetrahydrotripyrrin and 5,5′-bis(tolylhydroxymethyl)-2,2′-bithiophene gives 5,20-ditolyl-27-oxa-25,29-dithiasapphyrin. The X-ray crystal structure revealed this sapphyrin derivative has an O-inverted structure.