摘要:
In this paper, a series of optically active MeO-BIPHEP-type ligands, (S)-6,6'-dimethoxy-2,2'-bis(di-p-alkoxyphenylphosphine)-1,1'-biphenyl were synthesized and used to prepare the ruthenium complex. The effects of para-substituted were observed, the results showed that the ruthenium catalysts [diphosphine RuCl2 diamine] containing both t-Bu and i-Pr substitutions have better activities and enantioselectivities than the non-substituted ruthenium catalysts in the asymmetric hydrogenation of acetophenone (C) 2010 Hua Chen Published by Elsevier B V. on behalf of Chinese Chemical Society All rights reserved