此反应表现出高度的立体选择性。
上述反应具有(顺，反)立体选择性。
These, cycloaddition reactions proceed with stereoselectivity.
反应有较好的立体选择性。
键的立体选择性形成是有机合成化学的重要方面。
The stereoselective formation of c-c bonds is a central aspect of organic synthetic chemistry.
通过增加反应的空间位阻改进了反应的立体选择性。
The stereoselectivity was improved by increasing steric hindrance of the reactions.
论文首先建立了一种新的立体选择性酰胺酶的筛选模型。
A novel enantioselective amidase screening system was developed and proved to be efficient and accurate.
本文主要研究手性模板作用下的光环合反应的立体选择性。
The aim of this research is to study the stereoselectivity of photocyclization reaction in the act of chiral template.
本文简要介绍用几种方法立体选择性合成三和四取代烯烃。
This paper reports briefly stereoselective synthesis of tri and tetra-substituted ethylenes by some methods.
同时，对该烯化反应所表现出的高度立体选择性作了合理解释。
Also, the high stereoselectivity of the Wittig olefination has been well rationalized.
对反式- 1，2 -二取代烯烃的立体选择性优于单取代烯烃。
The enantioselectivity for trans 1,2 disubstituted olefins is better than that for mono substituted olefins.
另一种是通过碳正离子中间体进行的，它所得到的产物无立体选择性。
The other is conducted amidst carbonium ion intermediate and the product thus brought about has no stereoselectivity.
综述了酶催化立体选择性合成及动力学折分制备旋光性氰醇的几种方法。
Several enzymatic methods, including enzyme catalyzed enantioselective synthesis and kinetic resolution, for the preparation of optically active cyanohydrins are reviewed.
在这些容器，双分子之间的反应，特别挑选客人进行高区选和立体选择性。
In these containers, bimolecular reactions between specially selected guests proceed with high regio - and stereoselectivity.
生物催化因其高效和高度的立体选择性，成为手性合成最重要的方法之一。
Biocatalysis has become one of the most promising and effective methods in the asymmetric synthesis for its outstanding stereochemical specificity.
综述羧酸衍生物的烯醇盐氧化二聚成键的规律，重点是立体选择性的过程。
Stereoselective oxidative dimerization of the enolate of carboxylic acid derivatives is summarized focusing on the stereoselectivity of the process.
目的：研究普罗帕酮(PPF)经人肝cyp3a 4代谢的立体选择性。
AIM: To investigate the stereoselective metabolism of propafenone (PPF) by human liver CYP3A4.
高立体选择性合成反式-2，5-二取代四氢呋喃是期待解决的关键问题。
The key problem is to synthesize high stereoselectively trans- 2,5- disubstituted tetrahydrofurans.
本文综述了手性药物药代动力学立体选择性及其影响因素方面的最新研究进展。
In this paper, it was reviewed that the most recent results on the study of the stereoselectivity in pharmacokinetics and its related factors.
立体选择性化合物的制备是当代有机合成化学中非常重要而且具有挑战性的领域之一。
The preparation of stereospecific compounds is an important and challenging area of contemporary synthetic organic chemistry.
综述了在有机合成领域中，通过炔烃立体选择性还原制备Z-或E-烯烃的近期方法。
This article reviews recent methods used in organic synthesis for the stereoselective reduction of alkynes to Z or E alkenes.
生物催化剂的立体选择性是它们的主要优势之一，用酶催化c—c键形成已引起了广泛关注。
The stereoselectivity of biocatalysts is one of their major advantages and has fueled widespread research on enzymes for c-c coupling.
脂肪酶具有宽的底物专一性、高的立体选择性，在生物有机不对称合成中扮演着重要的角色。
Lipase has wide specificity for substrate, high stereoselectivity and plays very important role in the bioorganic synthesis.
目的：从土壤中筛选出能立体选择性水解布洛芬乙酯，并且水解产物为S -布洛芬的菌株。
Aim: to screen strains of high preference for enantioselective hydrolysis of ibuprofen ethyl-ester to the corresponding S-ibuprofen from soil samples.
另外，各类亲核试剂对环氧的开环得到了区域选择性和反式的立体选择性都较高的开环产物。
In addition, high reactivity with various nucleophiles leads to high regioselective and trans-stereospecific ring-opening products.
讨论了配位基的形状，反应物的构造，碱的类型以及反应时间对反应速率和立体选择性的影响。
The effects of the structure of ligands and substrates, the type of alkali, and reaction time on rate of reaction and stereoselectivity were discussed.
简要综述了对2,3 -环氧醇及其衍生物进行区域及立体选择性开环的各种方法的近期进展。
This paper reviews briefly recent developments in the regio and stereoselective ring opening of 2, 3 epoxy alcohols and their derivatives by a variety of methods.
结果表明，在此催化剂作用下，碘代苯与丙烯酸反应具有较好的立体选择性，只生成反式苯丙烯酸；
The result shows that, under this catalytic reaction, the Heck arylation of iodobenzene with acrylic acid has a good stereoselectivity and only trans-cinnamic acid is produced.
最后我们选用异二丙胺锂（LDA）为碱，在干冰丙酮浴下，合成了烯醇磷酸酯，并有很高的立体选择性。
At last , we used the base: LDA, dry ice-acetone bath , to synthesize the enol phosphates and gain very high rigio-selectivity.
研究了烷基苯基硅铜酸盐与2-环烯酮的1，4-加成反应的立体选择性，并合成了一系列新的2-取代-3-硅基环烷酮。
The stereoselectivity of 1,4-addition of dialkylphenylsilyl cuprates to 2-cycloenones was investigated and meantime a series of new 2-substituted-3-silylcycloalkanones were synthesized.
结论3，5 二硝基苯甲酰氧基作为良好的糖端基离去基用于寡糖的合成，具有反应条件温和、收率较高、立体选择性好的特点。
Conclusion The 3, 5-dinitrobenzoyl group was found to be a good leaving group at the anomeric position and O-glucopyranosides and oligosaccharides were stereoselectively synthesized in good yield.
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