Transition metal catalyzed asymmetric cross coupling reactions. New ligands and the effects of added salts. Crystal structures of [Ph2PCH2CH{(CH2)3SMe}NMe2]·PdCl2 and [Ph2PCH2CH{(CH2)2SMe}NMe2]·PdCl2
作者:Graham Cross、Bindert K. Vriesema、Gerd Boven、Richard M. Kellogg、F. van Bolhuis
DOI:10.1016/0022-328x(89)87299-7
日期:1989.7
the carboxylgroup followed by substitution of hydroxyl by the diphenylphosphino group. These ligands are effective in promoting the Ni0 or Pd0 catalyzed cross coupling of the Grignard reagent of 1-chloro-1-phenylethane with vinyl bromide. The enantiomeric excesses found for coupling product formed in the presence of these ligands exceed those expected on the grounds solely of a steric effect of the