meso‐Aryl [20]π Homoporphyrin: The Simplest Expanded Porphyrin with the Smallest Möbius Topology

• DOI: 10.1002/anie.201709859
• Publication Date: 2017-10-17T11:18:50Z
• Authors: K. S. Anju; Mainak Das; B. Adinarayana; Cherumuttathu H. ...; A. Srinivasan
• Keywords: Free base

Abstract An unstable conjugated homoporphyrin was successfully stabilized by introducing meso ‐aryl substitutents. It evident from the moderate diatropic ring current found NMR analysis that newly formed 20π free base and its protonated form exhibited Möbius aromatic character. Furthermore, complexation as a ligand with an Rh I ion afforded unique binding mode retained aromaticity. Overall, these compounds are smallest molecules, confirmed spectral crystal‐structure supported theoretical studies.