对映的

It was found that the carbonyl group in 3-position of the 1-alkynes is important for the enantioselectivity of the reaction.

通过研究发现，只有炔基与羰基相连时，反应的对映选择性才会比较高。

The results show that catechin stereoisomers possess the same fragmentation pathways and cannot be differentiated even in MS spectra.

发现儿茶素对映异构体间具有相同的质谱裂解途径，多级质谱无明显区别。

In Chapter 2, enantioseparations of four pairs of neutral and poorly water-soluble organophosphorus pesticides enantiomers were achieved by using natural chiral surfactant sodium cholate either with sodium dodecyl sulphate or with γ-cyclodextrin in nonaqueous solvent or aqueous-organic solvent systems.

第二章在非水介质或水相/有机介质中，或将天然表面活性剂胆酸钠与阴离子表面活性剂十二烷基硫酸钠构成混合手性胶束，或将胆酸钠与γ-环糊精构成二元手性协同体系，用于中性疏水有机磷农药对映体的手性拆分。

Diastereomers of cinchonine and cinchonidine were separated in pressure-assisted capillary electrochromatography mode, and the resulted separation efficiency was much higher than that obtained in high performance liquid chromatography.

采用压力辅助电色谱模式拆分了非对映异构体辛可宁和辛可尼丁，其柱效远高于其在HPLC中拆分的结果。

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。

The easy recovery of chiral auxiliary, good selectivity and high yield of this reaction make it a potential method in the synthesis of multifunctional optically active cyclopropane derivatives.

手性硫叶立德控制的高对映选择性合成多取代烯基环丙烷衍生物。

For example, unwanted side effects or even toxic effects can occur with the second enantiomer in several cases.

例如，在许多情况下，第二种对映体往往会产生不必要的副作用甚至毒性。

Results Baseline resolution of the enantiomer was readily achieved using 2, 3, 6-O-trimethyl-β-cyclodextrin.

结果在所确定的条件下盐酸美普他酚对映体达到基线分离。

Under the determined extraction conditions, a new process of countercurrent liquid membrane extraction technology was adopted to separate terbutaline enantiomorph.

基于实验已确定的萃取条件，采用液膜逆流萃取技术分离特布他林对映体。

Distribution behavior of terbutaline enantiomorph was investigated in a aqueous/organic two-phase system containing a chiral selector (L-dihexyltartrate).

研究了特布他林对映体在含手性选择剂水－有机溶剂两相体系中的萃取分配行为。

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！