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    学术讲座(六十一):Chiral Cationic Ion-Pairing Catalysis

    2018-11-26

     

    主讲人: Choon-Hong Tan教授

    时间: 20181125日上午8:00-9:00

    地点: 深圳大学西丽校区420会议室

    报告人简介:

    Schoolof Physical & Mathematical Sciences

    Divisionof Chemistry and Biological Chemistry

    NanyangTechnological University

    Email:choonhong@ntu.edu.sg

    1999          Ph.D., University of Cambridge

    2000-2003 Postdoctoral Fellow, Harvard University

    2003-2012 Department of Chemistry, National University of Singapore, Assistant and Assoc Professor

    2012-         Division of Chemistry and Biological Chemistry, Nanyang TechnologicalUniversity, Professor

    讲座摘要:

    Phase transfer reactions using chiralcations and inorganic basic salts such as hydroxides and carbonates are but asub-set of a larger group of reactions known as chiral cation ion-pairingcatalysis. Herein, we report three reactions using chiral dicationicbisguanidinium ion pairs as catalysis; they are are each paired with threedifferent organometallic anions – permanganate, tungstate and molybdate. Theion pairs-catalyzed asymmetric oxidation of alkenes and sulfoxidationrespectively. In this new mode of cataysis, evidence suggests that rateacceleration is mainly attributed to transition state stabilization through attractivecation-anion interaction rather than enhancing solubility in organicsolvents.

     

     

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