立体化学的

In recent two or more decades, stereodynamics,focused on the research of correlation of angular momentum and othervectors in the process of reactions, was developed and has made a greatachievement both in theories and experimental methods.

近二十几年来发展起来的立体化学动力学以研究反应过程中矢量相关为主，对反应过程中的角动量的研究在理论和实验上都取得了很大的进展。

In chapter one, we introduced Ylides in brief and reviewed the methods 、 mechanisms and stereochemistry of the Wittig reaction.

第二章水相中的Wittig反应主要是半稳定Ylide和苯甲醛及各种取代苯甲醛在水相中的Wittig反应作了初步探索，考察水相中的反应条件，如反应时间，反应温度以及碱对水相Wittig反应的反应产率和立体化学影响。

On the basis of the photoreactivity, spectroscopy, and spectrometry data, we determined the structure of the new photoproduct to be a nonadjacent cis-anti cyclobutane dimer formed between T2 and T7 with the absolute stereochemistry depicted by structure I (Figure 8B).

结论根据photoreactivity、分光学和光谱数据，我们确定新的photoproduct的结构是nonadjacent同边反cyclobutane二聚体被形成在T2和T7之间以结构描述的绝对立体化学I (图8B)。

Lactonization of 32 swiftly took place under basic condition, and the first four-ring intermediate 53 was gained.

以动力学烯醇化-氧化的方法，在18的〓位引入了〓羟基，解决了构成1，4-内酯环的相对立体化学问题。32在碱性条件下，顺利完成了1，4-内酯环的构筑，首次获得了四环中间体53。

Olefine, electrophilic or nucleophilic substitution of arenes, nucleophilic addition of carbonyl compounds stereochemistry in elimination reaction of double bond forming and the choosing of oxidants and reducing agents in redox system.

在化学反应方面重点是烯烃的亲电加成，芳香烃的亲电，亲核取代，羰基化合物的亲核加成，消除反应的双键定位和立体化学，氧化，还原反应中氧化还原剂的选择。

The quantum mechanical calculation results suggested that the energetics of stereochemical control during the tricyclic Markovnikov cation deprotonation step could be affected by the inclusion of these enzymatic effects.

而量子力学的计算结果显示出酵素催化反应里所产生的种种效应都对在三环马可尼可夫碳阳离子的去质子化步骤中立体化学特性有重大影响。

The stereochemical studies of PPCs derived from the copolymerization of CO_2 with chiral PO at various conditions reveal that the polymer enantioselectivity is proportional to its head-to-tail linkages with regard to regioselective ring-opening of the epoxide.

通过研究聚碳酸酯的立体化学发现聚合物的对映体选择性与环氧丙烷区域选择性开环存在一定的影响作用。

The abnormal Beckmann rearrangement of steroid-17-one oximes affords the corresponding alkylene-nitrile product as important intermediates for this purpose.

对九个甾体-17-酮肟的非正常Beckmann重排反应研究发现甾体分子上的取代基和立体化学对反应没有明显的影响（Scheme 1）。

The first part is concerned with catalytic asymmetric borane reduction of aromatic ketones. Up to 83% ee could be obtained with 10 mol% Al3/BINOL2 complex as catalyst.

在不对称硼烷还原反应方面，利用BINOL作为掌性配位基与Al3组成催化系统还原芳香酮类，反应过程方便快速，最高可获得83%的镜像超越值，我们也推测了可能的反应机构并用以解释所得产物的立体化学组态。

Because of the good regio-and stereoselectivity, Diels-Alder reaction has become the important tool of synthetic chemistry and significant object of theoretical study.

Diels—Alder反应由于其良好的区位和立体选择性而成为合成化学的重要工具及理论研究的重要对象。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。