对映的

When ligands with only planar chirality were used in the two model reactions (allylic alkylation and amination), comparatively high enantioselectivities were obtained.

令人鼓舞的是设计合成的只具有平面手性的膦氮配体，也可以取得中等到良好的对映选择性。

They had graced it with water plants and goldfish. Perhaps out of a yearning for their homeland, they had even engraved on a taihu rock four Chinese characters:"Er Quan Ying Yue"meaning"two springs reflecting the moonlight."These characters were painted red and written in an ancient calligraphic style.

他们在池中放了些水草和金鱼，可能是为了抒发对祖国的怀念之情吧，还在太湖石上用秀丽的隶书字体刻了"二泉映月"四个红字，似乎这么一来，西湖便在他们的怀抱之中了，故乡的月便也在向着这些游子微笑了。

They had even engraved on a taihu rock four Chinese characters:"Er Quan Ying Yue" meaning "two springs reflecting the moonlight." These characters were painted red and written in an ancient calligraphic style. The homesick Chinese teachers seemed to feel that at the sight of these characters, they could by a flight of the imagination bring to their presence a native moon smilingly beaming over the West Lake.

他们在池中放了些水草恶化金鱼，可能是为了抒发对祖国的怀念之情吧，还在太湖石上用秀丽的隶书字体刻了"二泉映月"四个红字，似乎这么一来，西湖便在他们的怀抱之中了，故乡的月便也在向着这些游子微笑了。

Studing on samarium diiodide promoted asymmetric intramolecular reducing coupling reactions, we have made the resolution of the racemic biaryl dials by using enantiomeric N-tert-butanesulfinamine as the resolving reagent successfully and thus obtained a series of axially chiral biaryl dials with high enantiomeric excess.

中文摘要在二碘化钐促进的分子内不对称还原偶联反应中，我们不仅对联芳基二醛底物的合成路线进行了优化，还发现N-叔丁基亚磺酰胺辅基可以作为手性试剂，成功地对联芳基骨架二醛化合物进行拆分，得到高对映体过量的轴手性二醛类化合物。

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。

Meso-Tetrakis(2,6-dichlorophenyl)porphyrinmanganese chloride and carbonyl ruthenium meso-tetrakis(2,6-dichlorophenyl)porphyrin were prepared and used to catalyze the diastereoselective epoxidation and amidation of 3β-substituted Δ 5-steroid derivatives.

研究了 5 ，10 ，15 ，2 0 (2 ，6 二氯苯基)卟啉锰及其钌配合物这类非手性的催化剂催化3β取代的Δ5 甾体衍生物的非对映选择性环氧化及酰胺化反应。

The present paper dealswith the preparation of surfactant (deoxycholic sodium and tetrabutylammonium bromidemixture) coat bonded to silica gelwith alkyls aswell as its application to the separation of chiral enantiomers.

提要： 研究脱氧胆酸钠和溴化四丁铵的混合态表面活性剂涂层烷基键合硅胶固定相的制备和它在手性对映体分离中的应用。

E. The low enantioselectivity may be due to the background reaction of diphenylzinc with imines.

的光学纯度和90%的化学收率，估计低对映选择性可能是苯基锌具有较强的背景反应。

Compared with tartrates of low molecular weight, although the workup was simplified, the catalytic activity and enantioselectivity aren't acceptable.

的对映选择性，但这种高催化活性仅存在于个别底物的环氧化中，并且配体的用量较大，一般都在50％mol。

Chiral amine-protonic acids are highly efficient and excellent enantioselective organocatalysts developed in recent years. They have been successfully applied to a number of enantioselective organic reactions, such as asymmetric aldol condenstion, Michael addition, Diels-Alder cycloaddition, Strecker reaction and so on.

手性胺-质子酸是近年来发展起来的新型高效、高对映选择性的有机催化体系，已成功应用于催化不对称Aldol反应、Michael加成反应、Diels-Alder反应和Strecker反应等许多重要的有机合成反应。

It has been put forward that there exists single Ball point and double Ball points on the symmetrical connecting-rod curves of equilateral mechanisms.

从鲍尔点的形成原理出发，分析对称连杆曲线上鲍尔点的产生条件，提出等边机构的对称连杆曲线上有单鲍尔点和双鲍尔点。

The factory affiliated to the Group primarily manufactures multiple-purpose pincers, baking kits, knives, scissors, kitchenware, gardening tools and beauty care kits as well as other hardware tools, the annual production value of which reaches US$ 30 million dollars.

集团所属工厂主要生产多用钳、烤具、刀具、剪刀、厨具、花园工具、美容套等五金产品，年生产总值3000万美元，产品价廉物美、选料上乘、质量保证，深受国内外客户的青睐