科研之友
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摘要
Hydrophobic Fre´chet-type dendritic chiral 1,2-diaminocyclohexane- Rh(iii) complexes have been applied in the asymmetric transfer hydrogenation of ketones in water using HCOONa as hydrogen source. The catalysts were found to be finely dissolved in the liquid substrates in the aqueous mixture and exhibited high catalytic activity and enantioselectivity (52-97% ee). The catalytic loading could be decreased to 0.01 mol% and good conversion was still obtained with excellent enantioselectivity. Moreover, the catalyst could be easily precipitated from the mixture by adding hexane and reused several times without affecting the high enantioselectivity.
- 出版日期2006
- 单位四川大学
