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Rate Enhancement with a Bowl-Shaped Phosphane in the Rhodium-Catalyzed Hydrosilylation of Ketones

Authors

  • Osamu Niyomura Dr.,

    1. Catalysis Research Center and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0811, Japan, Fax: (+081) 11-706-3698
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  • Makoto Tokunaga Dr.,

    1. Catalysis Research Center and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0811, Japan, Fax: (+081) 11-706-3698
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  • Yasushi Obora Dr.,

    1. Catalysis Research Center and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0811, Japan, Fax: (+081) 11-706-3698
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  • Tetsuo Iwasawa,

    1. Catalysis Research Center and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0811, Japan, Fax: (+081) 11-706-3698
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  • Yasushi Tsuji Prof. Dr.

    1. Catalysis Research Center and Division of Chemistry, Graduate School of Science, Hokkaido University, Sapporo 060-0811, Japan, Fax: (+081) 11-706-3698
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  • Financial support from the Asahi Glass Foundation is gratefully acknowledged. O.N. is grateful to the JSPS Research Fellowships for Young Scientists.

Abstract

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Bis zu 154fache Geschwindigkeitssteigerung und dazu höhere Ausbeuten bei der Rh-katalysierten Hydrosilylierung von Ketonen lassen sich mit dem schalenförmigen Triarylphosphan-Liganden P(tm-tp)3 im Vergleich mit P(tp)3 erreichen (siehe Bild). Zwar sorgt auch P(tp)3 mit seinen Terphenylsubstituenten für starke sterische Abschirmung, doch lässt sich diese durch die zusätzlichen Methylgruppen in P(tm-tp)3 offensichtlich noch verbessern, was die Katalysatorleistung deutlich erhöht.

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