对映的

The synthesis process comprises using chiral phosphorus acid as catalysis, synthesizing 2-(4, 7-indoline) compound in high efficiency and highly enantioselective by using sulfur imide and 4, 7-indoline compound, and products can be used to prepare several 2-dimethylamino indoline compounds with high optical activity through oxidation reaction.

以手性磷酸作为催化剂，由磺酰亚胺和4，7-二氢吲哚化合物可以高效率高对映选择性的合成2-甲氨基(4，7-二氢吲哚)化合物；产物可以经过氧化反应用于制备多种高光学活性的2-甲氨基吲哚化合化合物。

Levorotatory and dextrorotatory enantiomers of cetirizine and other nine compounds were synthesized and were identified by MS, IR, 1H-NMR and elemental analysis .

通过化学拆分得到单一手性的4-氯-α-苯基苯甲胺，然后由它出发合成出左西替立嗪和其它九个化合物的单一对映体，并经元素分析、红外、质谱、核磁等鉴定。

" Racemate: Mixture of equal quantities of two enantiomers, substances whose molecular structures are mirror images of one another."

外消旋体：两种分子结构互为镜像的对映体的等量混合物。

This intermediate is responsible for the stereoselective nucleophilic substitution and the subsequent racemization of 3-EtO-NDZ enantiomers in acidic ethanol.

该中间体导致了3-EtO-NDZ对映异构体在酸性乙醇中所发生的立体选择性亲核取代反应及随后的消旋过程。

Many chiral drugs may differ in their pharmacological activities due to the difference of stereochemistry.

许多药物对映体由于其空间结构的差异，导致其药理、药效上有很大的不同。

Their diasteroisomers were achieved because the group of alkoxy assaulted C_1 of 2-deoxyribofuranosyl chloride from different directions.

因烷氧基可从呋喃脱氧糖环的不同方向进攻1-位碳原子，因而所得到的烷基呋喃脱氧戊糖苷是一对非对映异构体。

As a result,it is of vital importance to separate the enantiomers of a chiral drug in metabolic studies.

因此，在手性药物代谢的研究中，同时测定对映体是极为重要的。

We have initially examined organocatalytic enantioselective synthesis ofα-Hydroxy phosphonates through the reaction of dialkyl phosphates and aldehydes.

我们初步实验了对映选择性的有机催化二烷基亚磷酸酯和醛的反应不对称合成α-羟基膦酸酯。

Treatment of dials with N-tert-butanesulfinamide, all biaryl dials were successfully converted into the corresponding bis-imines which were then treated with samarium diiodide to afford diamine products. The absolute configurations of all the intramolecular coupling products were determined by X-ray crystallography.

轴手性二醛与N-叔丁基亚磺酰胺缩合得到相应的亚胺，其为一对非对映异构体。N-叔丁基亚磺酰亚胺在二碘化钐条件下得到的偶联产物，经X-衍射也确定了其立体构型。

Optical quartz is supplied in single crystal Z-orientated blocks, up to 30 mm truck, of a right enantiomorphous modification of quartz.

光学石英是由东方石块的单一水晶提供，最多30MM卡车，正确对映形态的修正

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！