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Metalation-Triggered Möbius Aromaticity
Y. Tanaka, S. Saito, S. Mori, N. Aratani, H. Shinokubo, N. Shibata, Y. Higuchi, Z. S. Yoon, K. S. Kim, S. B. Noh, J. K. Park, D. Kim*, A. Osuka*
Yonsei University, Seoul, Korea; Kyoto University, University of Hyogo and The RIKEN SPring-8 Center, Hyogo, Japan
19 March 2008 (online)
A new way to achieve complexes that exhibit Möbius aromaticity is described. Conjugated oligopyrrolic macrocycles (also known as expanded porphyrins) were locked into a twisted Möbius strip conformation using group 10 metals. Experimental and numerical studies reveal compounds 3, 5, and 7-9 as conformationally locked Möbius aromatic molecules.