An equation is presented which shows a nonlinear relationship between the enantioselectivities for asymmetric reactions of bifunctional and monofunctional substrates; practically complete enantioselectivity (100% e.e.) was observed in the enantioselective diethylation of terephthalaldehyde with diethylzinc using N,N-di(n- butyl) norephedrine and (S)-diphenyl(1-methylpyrrolidin-2-yl) methanol as chiral catalysts.
该方程式显示了双官能基质和单官能基质不对称反应的对映选择性之间的非线性关系;使用 N,N-二(正丁基)
去甲麻黄碱和 (S)- 二苯基(
1-甲基吡咯烷-2-基)
甲醇作为手性催化剂,在
对苯二甲醛与
二乙基锌的对映选择性
二乙基化反应中观察到了几乎完全的对映选择性(100% e.e.)。