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Helical Chirality Control of Palladium Complexes That Bear a Tetrakis(phosphanyl)terphenyl Ligand: Application as Asymmetric Lewis Acid Catalysts

Authors

  • Kohsuke Aikawa,

    1. Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552, Japan, Fax: (+81) 3-5734-2776
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  • Koichi Mikami Prof. Dr.

    1. Department of Applied Chemistry, Graduate School of Science and Engineering, Tokyo Institute of Technology, Ookayama, Meguro-ku, Tokyo 152-8552, Japan, Fax: (+81) 3-5734-2776
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  • We are grateful to Dr. Kenji Yoza and Mr. Kazuyoshi Kitajima in the Nippon Bruker Co. for X-ray crystallographic analysis. K. Aikawa is grateful to the Japan Society for the Promotion of Science for Young Scientists for a research fellowship.

Abstract

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Both axial and helical chirality are generated by complexation of the novel tetrakis(phosphanyl)terphenyl (tetraphos) ligand to a metal center (see picture). The tropos nature of the ligand was confirmed, and enantiopure Pd complexes controlled by diamines were applied as asymmetric Lewis acid catalysts in carbonyl–ene reactions.

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