Sessler Jonathan L, Cho Dong-Gyu, Stepień Marcin, Lynch Vincent, Waluk Jacek, Yoon Zin Seok, Kim Dongho
Department of Chemistry and Biochemistry and Institute for Cellular and Molecular Biology, 1 University Station A5300, The University of Texas at Austin, Austin, TX 78712-0156, USA.
J Am Chem Soc. 2006 Oct 4;128(39):12640-1. doi: 10.1021/ja064675z.
The synthesis of an inverted, methoxylated sapphyrin derivative is described. This system, wherein inversion of pyrrolic nitrogen atoms is configurationally enforced via the use of a 3,3'-bipyrrolic precursor, displays what is best described as "weak aromaticity" as judged from its spectroscopic features and supporting theoretical calculations.