映

As well as activity was exhibited. Theaddition of cinchonidine led to a remarkable increase in the reaction rate, as confirmed bythe IR study that the modifier activates the carbonyl groups of the reactant through itsquinuclidine nitrogen. On the contrary,〓 exerted a strong inhibition effect on theenantioselective hydrogenation. Chapter 3 Finely dispersed polyvinylpyrrolidone-stabilized iridium andbimetallic clusters were prepared by the alcohol-water reduction method.

第三章 采用醇水还原的方法制备了聚乙烯基吡咯烷酮稳定的铱纳米簇及双金属纳米簇，对丙酮酸甲酯的催化氢化表明，在铱金属簇催化体系中，辛可尼定不仅诱导了一定的对映选择性，同时对反应活性有明显的促进作用，平均反应速率可提高2-6倍。

The results of the reaction show that better regioselectivity is obtained when Cd2+ is used as additive and give stereoselective product when cinchonine is used as chiral additive.Keywords: NaBH4, Regioselective,Stereoselective,Benzoyl acetone,Metal ion

结果发现，不同的金属离子添加剂使反应出现不同的化学选择性，而Cd2+离子对苯甲酰丙酮的还原具有较好的化学选择性，同时在辛可宁存在条件下得到了对映体过量的产物。

A nonaquous capi l l ary e l ecbophoretic chira l separation of l , l '-bi-2-naphtho l with a new chira l se l ector N-benzy l cinchonine ch l oride is described in this paper.

利用新的手性选择剂苄基氯化辛可宁，在非水相中成功地分离了联萘酚对映体，并对分离的机理作了初步地探讨。

It is demonstrated that the chiral quaternary ammonium salts catalysts exhibit promising catalytic properties for the substrate. Part III: The synthesis and the characterizing of the macroporous aminomethyl resin-supported cinchona alkaloid complexes and the study on its catalytic properties The part consists of two subsections. the macroporous aminomethyl resin -supported cinchona alkaloid complexes were synthesized by the stuff (cinchonine, quinine and macroporous aminomethyl resin). Their structures were characterized by means of elemental analysis, XPS, TG/DTA; the chiral polymer-supported complexes were first used as catalysts for the reduction of ketones. Their catalytic properties for the reduction processes were investigated. The comparison of the products e.e., the conversion of the substrate among different reduction processes was employed with determined by HPLC. The effects of the time, the temperature, the ratio of catalyst to substrate, reaction solvent as well as the recycle times were also discussed.

第三章聚-4-氨甲基苯乙烯负载金鸡纳碱金属络合物的合成与表征及其不对称催化性能研究本章分为两节，以辛可宁和奎宁及聚-4-氨甲基苯乙烯为原料，合成了4种聚-4-氨甲基苯乙烯负载金鸡纳碱络合物催化剂，并对它们的结构用元素分析、X-射线光电子能谱、TG/DTA等几种测试手段进行了表征；首次将所合成的手性高分子负载的金属络合物用于催化芳香酮不对称还原反应，详细研究了所得的手性高分子负载的金属络合物对不同底物的催化性能，用HPLC等分析手段定量检测了还原过程的底物转化率及其产物对映异构体选择性，并考察了反应时间、反应温度、催化剂和底物投料比、反应溶剂和循环次数对催化性能的影响。

Cinematographer's film where the images,like the words in a dictionary,have no power and value except through their position and relation.

电影作者的影片里的映像，一如字典中的字语，只有通过它们的位置与关系，方具备其力量与价值。

They are of Chinese style and Western-style,classicality style and modem style.

我国的家具品种及其式样风格是中式与西式互映，古典与现代共荣。

On a slightly snowing night in a lonely street, he all of a sudden finds the shadow of coir raincoat of the south that he hasn't seen for a long time.

在某个下着微雪的夜晚，在某个寂寥的街道上，在街灯漠漠的照映下，他忽然发现了久违的江南蓑衣的影子。

You can paint the color, transparency, bump and displacement maps.

你可以绘制色彩，设置透明度，突出和位移映像。

And it makes us conjure up all kinds of ideas in sound as well as in image.

而且它可以让我们想象出所有形式的观念，有声音的，还有映像的。

Cluster is a system which is connected with a group of node computers via high performance network or local area network and provides high performance, high availability and high scalability.

机群就是通过高性能网络或局部网络将一组计算机系统互联，形成的具有单一系统映像的高性能、高可用性、高扩展性的计算机集群系统。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。