不对称的

Therelationship of the amount of catalyst and the ee% of product was seen to be negative nonlin-ear. Catalyst 3 was used in the enantioselective addition of diethylzinc to aromatic aldehydesand gave good results. The configuration of products was determined by the configuration ofthe catalysts' chiral carbon linked with hydroxy group. Using β- amino alcohols bearing only one chiral center as catalysts for the enantiose-lective addition were studied. D-N, N-dialkyl-2-amino butanol gave poor catalytic effect be-cause of their structure. The configuration of the product is the same as the catalyst. Anotherkind of β- amino alcohols - phenylglycine derivatives and valine derivatives have chiralcenter on the carbon linked with amino group. Catalyzed by-phenylglycine derivatives 6,7, 9, 10, the reactions gave satisfied results. The optical yields exceeded 80%.

在探讨了含有两个手性中心的β-氨基醇之后，选择了只有一个手性中心的β-氨基醇，一是手性中心为连羟基的手性碳原子：D-N，N-二烷基-2-氨基丁醇；二是手性中心为连氨基的手性碳原子：D-苯基甘氨酸衍生物和L-缬氨酸衍生物。D-2-氨基丁醇的催化效果不太好，这与其结构的空间位阻较小有关系，反应产物与连羟基手性碳构型一致；由苯基甘氨酸和缬氨酸出发合成五种β-氨基醇6-10，研究了不同ee％的-6作用下的二乙基锌-苯甲醛加成反应，发现该催化剂具有不对称放大效应；-7，9，lO的催化效果也比较令人满意，光学产率80％以上，所得产物构型与催化剂构型一致。

In this dissertation, Ir-catalyzed asymmetric hydrogenation of quinoline derivatives, pyridine derivatives and exocyclic enamines have been studied.

本论文研究了铱催化的喹啉和吡啶衍生物以及环外烯胺的不对称氢化。

Fluctuating asymmetry, as an ecological monitor, will be more sensitive than traditional parameters of life history and be able to quantitate the impact of environmental stress.

而波动性不对称FA的水平可用来指示某一种群对这种环境压力的进化和适应能力。

We used the reported chiral ligand QD-4 derived from quinidine to catalyze the reaction of aldehydes and methyl vinyl ketone in the presence of various additives and found that the highest e.

用喹尼叮衍生物QD-4分别催化醛和丁烯酮以及醛和丙烯酸-萘酚酯的不对称Baylis-Hillman反应，通过改变添加剂和优化反应条件，最终分别取得了最高为49％和70％的e.e值。

Up to 97% ee was also obtained in the asymmetric hydrogenation of the more difficult and less studied 2,3-disubstitued quinoline derivatives.

以手性二胺与金属铱形成的配合物Cp*Ir(CF3TsDPEN)为催化剂，研究了在空气条件下喹啉衍生物的不对称氢化反应。

In this paper research progress of synthesis of 1,1'- binaphthol and its derivatives by raceme resolution and asymmetry oxidative coupling reaction, related to 63 binaphthol compounds is detailed.

联二萘酚作为配体在催化不对称反应方面取得了极大的成功，是有机化学家研究的热点。

Chiral aminoalcohol is an important kind of chiral substance in the asymmetric synthesis, meanwhile, it is widely used in the field of medicine synthesis and the resolution of raceme.

手性氨基醇在不对称合成领域中是一类重要的手性源，同时，手性氨基醇在药物合成、外消旋体拆分等领域也具有广泛的用途。

As the chiral source of asymmetric induction, the chiral ligands control the procedure of stereochemistry in reaction.

在手性催化反应中，手性配体是不对称诱导的手性源，控制着反应的立体化学过程。

The stereochemistry of the asymmetric polymerization of TrMA as the chiralligand was discussed.

讨论了TrMA在-Sp存在下的不对称聚合过程中的立体化学。

The application of chiral sulfoxide's inclusion resolution in the preparation of chiral drugs and asymmetric Stre...

本论文研究和探索了手性亚砜包结拆分技术在手性药物的制备和不对称Strecker反应中的应用。

I will endeavour to find you some assistance.

我尽力帮你找人帮忙。

At first I only know bruck is the idol of American younglings, afterwards I returned back to Taiwan ,even in Beijing last year ,I saw her poster everywhere, I was so surprised at her charm.

起初我只晓得布鲁克雷德丝是美国少男少女崇拜的偶像，后来回台湾，甚至去年在北京，居然也四处看见她的海报，才惊讶她的魅力之大。