对映的

To our surprise we achieved the ligand 9, 11 and 29 with coordinating atoms fixing at benzylic and benzene ring positions, whose structure is unique in the planar chiral cyclophane chemistry.

以钯催化的烯丙基取代反应对配体进行了考察，硫醚或硒醚取代基在苄位取代的配体表现出更高的反应活性和更高的对映选择性，配体9和11均给出最高为94％的ee值。

In the second part of this thesis, a formal [2+2] cycloaddition ketenes and dialkyl azodicarboxylates was studied. We found that by adjusting the substituents in the diazenes, the reaction mode can be completely switched, and furnish four-membered-ring products, aza-b-lactams, the enantioselectivity was up to 91%.

经研究发现，通过对偶氮化合物取代基团的改变，我们可以实现[4+2]环加成反应到[2+2]环加成反应的转变，在手性氮杂环卡宾的作用下，对具有各种取代基的烯酮都可以很好的产率得到氮杂b-内酰胺，其对映选择性最高可以达到91%。

It was also noted that lipases preferentially esterify the S-isomer of ibuprofen, thus the scheme for resolution of ibuprofen in organic solvent can be expressed as follows

实验中发现脂肪酶优先酯化布洛芬S-对映体，因此在有机相中用脂肪酶催化酯化拆分布洛芬的方案可表示如下

For the first time, enantiomers of C2-symmetric 1,1 -spirobiindane-7,7'-diol were resolved with crude menthyl chloroformate by phase-transfer catalysis in the presence of tetrabutylammonium bromide. The reaction was carried out at 0℃-rt. The diastereomers of SPINOL bis-menthyl carbonate can be separated by simple crystallization using alcohol. The hydrolysis of the diastereomers was carried out via aqueous NaOH/EtOH solution.

首次通过相转移催化的方法对螺双二氢茚二酚进行了有效的拆分，用L--氯甲酸薄荷醇酯做拆分剂，以四丁基溴化铵为催化剂在0℃-室温下进行酯化反应生成非对映体衍生物，以乙醇作溶剂，通过重结晶的方法分离衍生物，在水-乙醇混合溶剂条件下，用强碱NaOH或KOH分别水解，制得相应的光学纯度大于99%ee的两个异构体SPINOL，其中总收率：--SPINOL，78.2%；--SPINOL，80.6%。

The yields and ees obtained in the AD reaction of eight olefins utilizing 10 in PEG/NMO system were 72～90% and 79～96%(except for trans-5-decene and ally naphthyl ether).

3配体10和配体8是一对假对映异构体，在AD反应中立体选择面相反，可得到相反构型的产物。

The selection of developing chiral drug s as strategy is on the important basis of chiral pharmacology study results but it is necessar.

基础生物化学研究推动手性药物市场持续增长，2 0 0 1年单一对映体药物市场为 14 70亿美元，占世界药品市场 4 10 0亿美元的 36 %。

New chiral phosphonic acids and zirconium phosphonates might have potential applications in asymmetric synthesis, enantioseparation and biochemistry.

手性有机膦酸及新手性层状膦酸-磷酸锆在不对称合成、对映体拆分和生物化学都可能有潜在的应用。

Prior to electrophoresis, the analytes were purified and preconcentrated by solid phase extraction from plasma.

血清样品通过固相萃取预处理和浓缩，对映体的固相萃取回收率在82.9%～90.7%，相对标准偏差RSD%均小于7 %。

The facts indicate that apart from the asymmetric induction of chiral diamine backbone,sterically hindered substitute groups on the aromatic rings,and the presence of sp~3-hydridized amino donors and its N,N\'-disubstituted groups in chiral SalanCrX complexes all play important roles in controlling polymer stereochemistry and enantioselectivity.

研究发现除了手性二胺骨架的不对称诱导作用，苯环上的大位阻取代基、N，N\'-二取代基的位阻作用以及N原子上sp~3杂化的供电子效应都对调控聚合物的区域和对映体选择性有很大作用。

The ligand of the chiral Schiff base and acetylacetone vanadium are subjected to complexation in situ, hydrogen peroxide is taken as an oxidant, aryl alkyl thioether asymmetric oxidation reaction is catalyzed in a toluene or dichloromethane solution under low temperature or room temperature, enantioselectivity of chiral sulphoxide is 72 percent to 95 percent ee, and yield is 42 percent to 83 percent.

将上述手性西佛碱配体与乙酰丙酮氧钒原位络合，采用双氧水为氧化剂，在甲苯或二氯甲烷溶液中低温至室温下催化芳基烷基硫醚不对称氧化反应，手性亚砜的对映选择性为72％-95％ee，产率为42％-83％。

She gently rebuff ed him, but agreed that they could be friends

她婉言拒绝了，但同意作为朋友相处。

If in the penal farm, you were sure to be criticized.

要是在劳改农场，你等着挨绳子吧！