Steric effects

Steric effects and the selectivity of organic reactions

空间效应与有机反应的选择性

Hydroformylation of High Olefin & Influence of Electronic and Steric Effects of Phosphine Ligand

长链烯烃氢甲酰化反应研究&膦配体的电子效应和空间效应影响

Severe steric effects at the reactive carbon would impede the substitution .

大的立体效应阻止在碳上的取代。

A theoretical study on electronic and steric effects of phosphorus ligands in homogeneous catalysts

氢甲酰化反应过渡金属络合催化剂有机膦配体调变效应的理论研究

The results showed that with the increasing of substitute degree , the steric effects of benzene ring appear gradually .

研究结果表明随着苯氧基取代程度的增加，苯环的空间位阻效应逐渐显现。

Steric Effects in Rate Constants for Bimolecular Dissociation

离解反应速率常数中的方位因素

The explanation of these results is based on the assumption that there are reaction mechanisms and steric effects of the zeolite pore .

实验结果可由氢型丝光沸石催化剂的酸强度、酸量、酸中心类型以及沸石晶体孔结构的空间效应与反应机理予以说明。

The steric effects on the reaction of6,6-dialkylfulvene with organolithium have been studied .

本文研究了6，6-二烷基富烯与有机锂反应的立体效应。

Polar and Steric Effects of the Esterification of Acetic Acid with Substituted Methyl Alcohols under the Catalysis of Ferric Sulfate Hydrate

硫酸铁水合物催化乙酸与取代甲醇酯化反应的极性效应和空间效应的分离

The relations between ring-substituted groups and the structure , crystallinity , morphology and electrochemical activity of these polymers were discussed by the electronic effects and steric effects of ring-substituted groups and characteristic of facial synthesis .

从环取代基的电子效应和立体效应以及界面聚合反应的特点，初步探讨了环取代基对界面聚合法合成的聚合物分子链的结构，结晶性，颗粒形貌以及电化学活性的影响。

The adsorption dynamics and isotherm analysis indicated that the steric effects on adsorption kinetics were primarily related with the largest molecular dimension of the adsorbate , and the steric effects on adsorption equilibrium were primarily related with the second molecular dimension of the adsorbate .

对吸附动力学和等温线分析表明，空间位阻效应对吸附动力学的影响主要与吸附质的最大维分子尺度有关，空间位阻效应对平衡吸附的影响主要与吸附质的次大维分子尺度有关。

The extraction behavior of these sulphoxides may be affected by charge density of coordination group and steric substituents effects .

对不同结构的烃基-苯并噻唑亚砜萃取硫脲介质中金的性能进行研究，结果表明亚砜的萃取性能受亚砜配位基团的电子密度和取代基的空间效应影响。

It follow therefore that the steric blocking effects of substituents are reflected in adverse kinetic , rather than thermodynamic factors .

由此可以看出，取代基的主本阻碍反应，是反映在违背动力学因素而不是热力学因素。

The extraction behavior of dialkyl ( aryl ) Sulfides may be controlled by polar and steric substituents effects .

二烃基（基）醚的萃取行为受极性和空间取代基效应的控制。

By introducing the steric hindrance effects of peripheral and axial substitutions , the red-shift and broadening of the bands are weakened as the structure of the thin films become amorphous .

通过加入分子周边取代和中心取代，从而引入空间位阻效应使薄膜的结构变为非定形，表现在其吸收带的线宽变窄，红移变小。

Asymmetric in - ductions usually governed by both steric and electronic effects .

其不对称诱导一般受立体和电子因素控制。

Furthermore , the NBO calculation implies that relative stabilities of all 15 con - formers can be attributed to the steric and hyperconjugation effects .

而且，NBO的立体和超共轭分析表明立体交换排斥能和超共轭作用对这些分子的相对稳定性起了重要作用。