查询词典 chiral

Stereoselectivity is the key affecting whether a biocatalyst can be effectively applied to chiral synthesis.

立体选择性是生物催化剂能否有效地应用于手性合成的关键。

This is a small softwarea that can generate carbon nanotube structure , you can set the bond length and chiral nanotubes.

详细说明：这是一个可以生成碳纳米管结构的小软件，可以设置键长和纳米管的手性。

Secondly, 11 chiral ligands containing BINOL and its derivatives werescreened in the asymmetric HDA reaction between Brassard diene withbenzaldehyde. The results revealed that-BINOL shows higherenantioselectivity and reactivity than the others.

其次将 11 个二齿配体 BINOL 及其衍生物用于 Brassard 二烯与苯甲醛的不对称 Hetero-Diels-Alder 反应，结果表明，-BINOL 表现出相对较好-i-范谦四川大学博士论文的反应活性和对映选择性。

Firstly, 24 chiral Schiff base ligands were prepared and evaluated for theasymmetric HDA reaction between Brassard diene with benzaldehyde. Theresults revealed that the ligand derived from 3,5-di-tert-butylsalicylaldehydewith (1R,2S)-2-amino-1,2-diphenyl-1-ethanol shows an excellent chiralinduction in the reaction.

首先合成了 24 个手性三齿席夫碱配体，并应用于 Brassard 二烯与苯甲醛的不对称 Hetero-Diels-Alder 反应，结果表明，3，5-二叔丁基水杨醛与(1R，2S)-1，2-二苯基-2-氨基-乙醇生成的单席夫碱显示出优秀的手性诱导能力。

In this thesis, we developed chiral proton N-O type ligands and employed them in the enantioselective addition of diethylzinc to N-diphenylphosphinoyl imines. The relationship between the structure of the ligands and the enantioselectivity was systematically studied. Furthermore, enantioselective butylation of N-diphenylphosphinoyl imines withBu〓Zn and enantioselective diphenylzinc addition to imine were also examined.

本文致力于亚胺的不对称催化有机锌试剂加成反应的研究：以手性质子型N-O配体为促进剂，对N-二苯基次膦酰亚胺进行不对称乙基锌加成反应而展开研究工作，系统地考查了手性配体的结构对反应的影响；另外，对N-二苯基次膦酰亚胺的不对称催化丁基锌加成进行了研究，并首次对亚胺的不对称苯基锌加成反应进行了初步探索。

Another example of chiral recognition is found in the effect these two carvone isomers have on rates of reaction.

我们也发现这两个香芹酮异构体对反应速率有不同影响的其它手性识别5的例子。

These two oils each contain limonene and carvone, but each oil contains a different isomer of these chiral compounds.

这两种精油各自都含有柠檬烯和香芹酮，但每种精油都是由具有不同手性的柠檬烯和香芹酮的异构体所组成的，在这个实验课中，学生会接触到真空蒸馏操作。

The optimal conditions were proved to be using5mo1% chiral ligands to catalyze the reaction at room temperature.

实验证明最佳反应条件是使用5mo1％的手性配体于室温下催化的反应。

Objective:Expound chirality with chiral drugs' concept and actual meaning of research.

目的阐明手性和药物手性的概念及其研究的实际意义。

In the direct separation of chirality,the preparation of chiral stationary phase is the key of the separation method.

在手性化合物的直接拆分中，固定相的制备是关键。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。