摘要
本文根据丙二酸亚异丙酯的单（Ⅰ）双（Ⅱ）Ｍｉｃｈａｅｌ缩合产物的ＵＶ，ＩＲ、￣１ＨＮＭＲ谱，分析了其５（６）－取代产物（Ⅰ，Ⅱ）的构型和构象。结果表明，当取代基为含α－芳基的单取代时，酯环构象为扭曲船式，取代基为含α，α＇－二芳基的双取代时，酯环构象为船式，显示了α（α，α＇）－芳基对２（３）－位甲基的远程屏蔽效应。
The configurations and conformations of the isopropylidene malonates mono(Ⅰ)di(Ⅱ)Michael condensation preducts are analyzed in detail by the data of UV IR and ￣1HNMR spectroscopy. The results show that the most stable conformation is the twist-boat form when the mono-substituted group contained α-aromatic group.If the di- substituted group containsα,α'-di-aromatic groups,the boat confomation is favourable It also shows a long range shielding effect of the α,(α,α')-aromatic group.
出处
《西南交通大学学报》
EI
CSCD
北大核心
1995年第4期444-448,共5页
Journal of Southwest Jiaotong University
关键词
丙二酸亚异丙酯
Michael综合
构型
结构分析
isopropylidene malonates
Michael condensation
configuration
conformation
structural analysis
