查询词典 Lewis base

The cat-alytic systems of Lewis acid and base are useful ways in the non-enzymatic catalysis. They were widely used to different kinds of kinetic resolution reactions. At present, mighty advances have been made in the field.

在非酶催化反应中，路易斯酸碱催化是比较常用的方法，它们被广泛地用于多种外消旋体的动力学拆分反应中，目前在该领域取得了很大的进展。

The catalytic systems of Lewis acid and base are useful ways in the non-enzymatic catalysis. They were widely used to different kinds of kinetic resolution reactions.

在非酶催化反应中，路易斯酸碱催化是比较常用的方法，它们被广泛地用于多种外消旋体的动力学拆分反应中，目前在该领域取得了很大的进展。

In this reaction, DMSO may act as a Lewis base to activate the nucleophile, which facilitates the ring-opening reactions.

与此同时，我们还发现在DMSO中，无催化剂的中型条件下，硫，胺以及各类硅亲核试剂可以对氮杂环丙烷化合物开环。

In the Phenoxy/SAN blends, it has been demonstrated that the crosslinking has taken place for Phenoxy components, which was proposed that the reaction is catalyzed by the SAN component which acts as a Lewis base.

在逐步原位聚合的Phenoxy/SAN共混体系中，研究结果表明，由于SAN组分的存在，导致了Phenoxy自身凝胶的形成，这可以归结为SAN组分对DGEBA均聚反应的催化作用。

Symmetric Lewis base has the following problem in the application that the relatively high content of regulator will reduce the rate of polymerization and impact further polymerization as well as the coupling process after the polymerization.

对称型路易斯碱在应用中存在问题：较高调节剂含量将会降低聚合速率、影响进一步聚合以及聚合以后的偶联过程。

Density functional theory calculations at the B3LYP/6-31G level of theory were employed to study the mechanism and the potential energy surface of Diels-Alder reactions between Lewis base stabilized borabenzene and dienophiles.

采用密度泛函理论方法在B3LYP/6-31G水平上研究了Lewis碱稳定的硼代苯与一些亲二烯体的两种可能的Diels-Alder反应的微观机理和势能剖面，并研究了反应的溶剂效应和取代基效应。

However, using tributylphosphine as a Lewis base and -1, 1'-bi-2-naphthol as a cocatalyst, the Baylis-Hillman reaction of arylaldehydes with cyclopent-1-en-one proceeded smoothly.

在本论文主要对磺酰亚胺和各种活化烯的aza-Baylis-Hillman反应以及它们的不对称aza-Baylis-Hillman反应进行了研究。

Nsted acid to activate the carbonyl group of the substrate and iV-oxide as Lewis base to activate TMSCN.

即：催化剂中的酰胺作为Brnsted酸活化羰基，氮氧偶极作为Lewis碱活化TMSCN。

The results showed that C 2H 6 can be adsorbed on the surface terminal oxygen of Lewis base site P=O bonds through H atom in -CH 3 to form a molecular adsorption state, and the adsorption intensity of C 2H 6 increases with the rising of adsorption temperature.

结果表明，乙烷能够以 CH3 中的H原子吸附于催化剂表面P =O键的端氧上形成分子吸附态，并且随着吸附温度的升高，对乙烷的吸附强度逐渐增大；乙烯则主要是以C =C双键吸附在催化剂的Lewis酸位Fe3 +上。

An ate complex is a salt formed by reaction of a Lewis acid with a base whereby the central atom increases its valence.

酸根型配合物是指路易斯酸與特定的鹼生成的中心原子價升高的鹽。

We are forbidden from giving money to these shoeless, skinny children, as this will perpetuate begging.

向光着脚，骨瘦如柴的孩子施舍是不可以的，因为要招来无休无止的乞讨。

It would be hard not to fall victim to some sharpeyed policeman.

要想不被某个目光锐利的警察抓到，谈何容易。