The hydrogenation of RCOCH2COR over a Raney nickel catalyst modified with a mixture of tartaric acid and NaBr gave (R*, R*-RCH(OH)CH2CH(OH)R selectively with a high optical purity. The substrates with R=CH3–, CH3CH2–, CH3CH2CH2–, CH3(CH2)4CH2–, and Ph– were employed in this study. In all cases, the recrystallization of the hydrogenation product gave an optically pure (R*,R*)-isomer which was free from the (R*,S*)-isomer.
在改性了
酒石酸和NaBr混合物的Raney
镍催化剂上,对RCO COR进行氢化反应,得到了光学纯度较高的(R*, R*-RCH(OH) CH(OH)R选择性产物。该研究中使用的底物包括R=
CH3–、 –、 –、 (
CH2)4 –以及Ph–。在所有情况下,氢化产物的再结晶得到的都是光学纯的(R*,R*)-异构体,且不含(R*,S*)-异构体。