作者:Mohammad M. Al-Arab、Hani D. Tabba、Imad A. Abu-Yousef、Marilyn M. Olmstead
DOI:10.1016/s0040-4020(01)86101-9
日期:1988.1
form. The structures of the reaction products were established by infrared, H-1 and C-13 nuclear magnetic resonance spectroscopy as well as by elemental analysis. The diastereomeric purity was determined by chromatographic and NMR measurements using achiral lanthanide shift reagents techniques. The observed resonances did not show any resolution of the diastereomeric proton signals. The stereochemistry
芳基乙腈向迈克尔受体(如α,β-不饱和腈)的迈克尔加成反应与化学计量的乙醇钠一起生成,仅得到纯的非对映体形式的1,4-加成产物。通过红外,H-1和C-13核磁共振波谱以及元素分析确定了反应产物的结构。使用非手性镧系元素转移试剂技术通过色谱和NMR测量确定非对映异构体纯度。观察到的共振未显示出非对映质子信号的任何分辨率。缩合产物的立体化学和绝对构型由X射线晶体学确定。