研究了重氮烯氢向前手性烯烃单侧的非对映选择性转移。
Diastereoselective transfer of the diazene hydrogen to one face of the prochiral alkene was studied.
第一部分描述了通过非对映选择性炔丙基化合成天然产物。
The first part describes the syntheses of natural products by means of diastereoselective propargylation.
溴原子所在的位置对反应的对映选择性有一定影响。
The position of bromo atoms has definite influence on the sulfoxidation of enantioselectivity.
大位阻取代基有利于提高对映选择性，但位阻过大降低催化活性。
The large steric hindrance group avails to the enantioselectivity, but too much steric hindrance reduces the activity.
该类合成方法简便有效， 对映选择性高，符合原子经济性要求，具有大的使用价值。
The synthetic process was simple, efficiency, highly enantioselectvity, atom-economic and with great practical worth.
将此类配体应用于各类官能化酮的不对称氢化中，取得了很高的对映选择性和催化效率。
When the ligands were applied to the asymmetric hydrogenation of functionalized ketones, excellent catalytic efficiency and stereoselectivities were obtained.
利用脂肪酶在有机溶剂中催化对映选择性酯化反应对外消旋薄荷醇进行了有效的光学拆分。
Optical resolution of racemic menthol has been efficiently achieved by lipase catalyzed enantioselective esterification in an organic solvent.
反应具有操作简便、对映选择性高等优点，反应产物可以用于很多手性药物和天然产物的合成中。
The reaction has the advantages of convenient operation, high enantioselectivity, and the like, and a reaction product can be used for the synthesis of many chiral medicaments and natural products.
添加剂4-苯基吡啶氮氧化物（PPNO）或三甲基氧化氨（MNO）对产物的对映选择性略有改善。
The addition of the donor ligand such as 4-phenylpyridine N-oxide (PPNO) or trimethylamine N-oxide (MNO) exhibits a minor positive effect on the enantioselectivity.
综述了近年来不同催化体系的不对称合成呐醇的方法，并总结了不同的催化效率和对映选择性的差异。
New methods for asymmetric synthesis of pinacol are reviewed, the catalytic effects and stereo - selectivity with various catalytic systems are discussed in this paper.
综述了近年来不同催化体系的不对称合成呐醇的方法，并总结了不同的催化效率和对映选择性的差异。
New methods for asymmetric synthesis of pinacol are reviewed, the catalytic effects and stereoselectivity with various catalytic systems are discussed in this paper.
第一部分是以基于锌粉-溴丙炔体系的、非对映选择性的炔丙基化反应为关键步骤，合成天然及类天然产物。
The first part describes the syntheses of natural products and natural-like products by means of diastereoselective propargylation as the key step.
初步研究结果表明，这类分子钳受体不但对中性小分子具有识别性能，而且对D/L氨基酸甲酯具有对映选择性识别性能。
The preliminary results indicate that these chiral molecular tweezers not only recognize neutral molecules, but also show enantio-selectivity for D/L-amino acid methyl esters.
以丙酮为溶剂，30％H2O2为氧化剂，两种体系催化苯甲硫醚氧化反应分别可以循环使用两次和三次，但产物亚砜的对映选择性很低。
The two catalytic systems can be recycled twice and three times, respectively, with very low enantioselectivities for the oxidation of phenyl methyl sulfide with 30% H2O2 as oxidant in acetone.
该酶对芳香族腈、脂肪族腈、饱和腈与不饱和腈均能作用，并具有较好的对映体选择性。
The enzyme could accept aromatic or aliphatic nitriles, unsaturated or unsaturated nitriles as substrates with high enantioselectivity.
总结了有机溶剂中的酶催化研究进展，讨论了影响有机溶剂中酶促不对称转化过程对映体选择性的因素和拆分动力学。
The factors influencing the enantioselectivity of enzyme catalyzed asymmetric transformations in organic phase, and the enzymatic resolution kinetics are discussed.
在萃取过程中加入光学纯酒石酸柱撑水滑石粉末，能明显提高对映体的选择性，对映体选择性分离因子最大值可达1.2。
The enantioseletivity can be improved obviously when the optical pure tartaric acid-LDHs powder was added during the process of extraction, the maximal enantioselective separation factor is 1.2.
具有反应条件温和，立体专一性或对映体选择性好的酶催化反应已在有机合成中得到广泛的应用。
Enzyme-catalyzed reactions which operate under mild reaction conditions with stereospecificity or enantioselectivity have been Widely used in organic synthesis.
本文综述了有机相中酶的活性、对映体选择性和稳定性的影响因素与可能的改进方法。
In this paper, the affecting factor and improvement of activity, enantioselectivity and stability of enzymes in organic solvents are reviewed.
探讨了介质工程、预处理酶及添加剂等因素对对映体选择性和产率的影响。
The factors such as solvent engineering, disposing of enzyme, additives and so on that can possibly enhance the selectivity and yield of enantiomers were discussed.
探讨了介质工程、预处理酶及添加剂等因素对对映体选择性和产率的影响。
The factors such as solvent engineering, disposing of enzyme, additives and so on that can possibly enhance the selectivity and yield of enantiomers were discussed.
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