立体电子效应

本文简要叙述了由立体电子效应控制的频哪醇重排反应。

The pinacol rearrangements controlled by stereoelectronic effect are briefly discussed .

立体电子效应控制的频哪醇重排反应

Rearrangement reactions of pinacol controlled by stereoelectronic effect

环己二醇发生频哪醇重排反应的立体电子效应

Stereoelectronic Effect in Pinacol Rearrangement Reactions of Cyclohexanediol

而立体电子效应和位阻效应与反应机制，反应物的结构-构象和反应条件等都有关系，最终能影响反应产物的立体结构。

Stereoelectronic effect and steric effect played a more or less important roles respectively in affecting the stereochemistry of the reactions because of different reaction mechanisms , conformational structures of the reactants and the reaction conditions .

在这对孤电子的立体电子效应作用下，促使重排基团带着一对电子从离去基团的反位上进行1,2&位移。

By the action of the stereoelectronic effect of this pair of unshared electrons , the migrating group with its a pair of bonding elections undergoes a 1,2-shift from the opposite position of the learing group .

通过分析竞争反应的过渡态在构象上能量的高低，探讨构象效应（立体电子效应和位阻效应）对一些有机反应的立体性的影响；

In this paper , the impact of conformational effect ( including stereoelectronic effect anil steric effect ) on the stereoselectivity in some organic reactions were discussed by estimating the energy difference between the intermediates of the competing reaction routes .

研究了体系的Cδ位上硝基、氨基和羟基取代所引起的立体效应和电子效应之间的相互影响，及这几种取代物在不同的溶剂环境中的几何结构和电子效应。

The interactions between the spatial effect and electron effect caused by substituent of nitro - , amino - , and hydroxyl groups of these compounds in different solvents were discussed .

樟脑类化合物由于其独特的立体结构和电子效应，已经在不对称合成反应中得到了广泛的应用，表现出较好的立体诱导效应。

Due to its unique steric structure and electronic effect , camphor compounds have been widely applied to asymmetric synthesis reactions , showing excellent enantioselectivity .