Chemistry Letters
Online ISSN : 1348-0715
Print ISSN : 0366-7022
ISSN-L : 0366-7022
Volume 36 , Issue 9
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  • Hisashi Yamamoto, Guoyao Xia
    2007 Volume 36 Issue 9 Pages 1082-1087
    Published: September 05, 2007
    Released: August 25, 2007
    JOURNALS RESTRICTED ACCESS
    The TBOxCrIIICl/TBOxCrII system is ideal for catalytic asymmetric redox process. Because of the electron density of the TBOxH ligand high turnover numbers are expected, hence allowing decrease in the chromium catalyst loadings and acceleration of the reaction rate. High reactivity and high diastereo-/enantioselectivity are shown in asymmetric pinacol coupling reactions of aldehydes, asymmetric NH allylation reaction of aldehydes, asymmetric allenylation reactions of aldehydes, and some other reactions. These proceed exceedingly efficiently catalyzed by the TBOxCrIIICl redox system due to the well-designed chiral environment of the ligands and the cis-β configuration of the center Cr metal.
    TBOxCrIIICl/TBOxCrII system is an ideal for catalytic asymmetric redox system. Because of the electron density of the TBOxH ligand, high turnover numbers are expected and hence allow decrease in the chromium catalyst loadings and acceleration of the reaction rate. Furthermore, high reactivity and high diastereo-/enantioselectivity are shown in asymmetric pinacol coupling reactions of aldehydes, asymmetric NH allylation reaction of aldehydes, asymmetric allenylation reactions of aldehydes, and some other reactions, which proceed exceedingly efficiently catalyzed by the TBOxCrIIICl redox system, due to the well-designed chiral environment of the ligands and the cis-β configuration of the center Cr metal. Fullsize Image
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