查询词典 chiral

Effect of kieselguhr on enantioselectivity of enzymatic hydrolysis of chiral dichlorprop methyl ester (2,4-DP) has been specifically studied by chiral gas chromatography.

利用手性气相色谱技术研究了硅藻土吸附作用对-2，4-二氯苯氧丙酸甲酯(2，4-DP)酶促水解对映体选择性的影响。

In chapter five, effect of temperature on the chiral separation of the molecular imprinting polymer was investigated and it was found that the chiral separation process was enthalpy-controlled.

第五章考察了温度对分子烙印聚合物的手性拆分能力的影响，进一步加深了对分子烙印手性固定相分离对映体的作用机理的认识。

However, the formation of metal chelation at one or two side of biphenyl resulted a pair of enantiomers of monometallic or bimetallic complexes. Moreover, if the coordinating groups have chiral element (e.g., chiral oxazolines), the diastereomeric metal complexes will be formed.

而且，如果配位基团上带有手性元素，它们跟金属配位后得到一对非对映异构体，由于手性元素的影响，形成这一对非对映异构体的能量是有差异的。

The technology of preparation of chiral phenylglycinol from chiral phenylglycine is turned out to be a technical platform which can prepare many kinds of aminoalcohol through repeated experiments of the small scale test.

并且经过实验室小试反复测试，证明由手性苯甘氨酸制备手性苯甘氨醇工艺有技术平台式作用，可用于各种氨基醇类化合物的合成。

Chiral separation of D -, L -phenylglycine by RP-HPLC was accomplished by adding a complex of optically active L -Phe-Cu2+ to the mobile phase. Chiral separation mechanism was further elucidated in light of unambiguously assigning the structure of the elutents from RP-HPLC by taking advantage of tandem mass spectrometry due to its unique capability of structural identification of the unknows.

以含 L -苯丙氨酸铜配位络合物的溶液作为手性流动相，采用反相高效液相色谱法拆分了非衍生苯甘氨酸对映体，使用质谱对拆分组分进行了结构鉴定，得到了拆分组分的化学结构，用量子化学计算预测了该结构的最稳定构象。

Therelationship of the amount of catalyst and the ee% of product was seen to be negative nonlin-ear. Catalyst 3 was used in the enantioselective addition of diethylzinc to aromatic aldehydesand gave good results. The configuration of products was determined by the configuration ofthe catalysts' chiral carbon linked with hydroxy group. Using β- amino alcohols bearing only one chiral center as catalysts for the enantiose-lective addition were studied. D-N, N-dialkyl-2-amino butanol gave poor catalytic effect be-cause of their structure. The configuration of the product is the same as the catalyst. Anotherkind of β- amino alcohols - phenylglycine derivatives and valine derivatives have chiralcenter on the carbon linked with amino group. Catalyzed by-phenylglycine derivatives 6,7, 9, 10, the reactions gave satisfied results. The optical yields exceeded 80%.

在探讨了含有两个手性中心的β-氨基醇之后，选择了只有一个手性中心的β-氨基醇，一是手性中心为连羟基的手性碳原子：D-N，N-二烷基-2-氨基丁醇；二是手性中心为连氨基的手性碳原子：D-苯基甘氨酸衍生物和L-缬氨酸衍生物。D-2-氨基丁醇的催化效果不太好，这与其结构的空间位阻较小有关系，反应产物与连羟基手性碳构型一致；由苯基甘氨酸和缬氨酸出发合成五种β-氨基醇6-10，研究了不同ee％的-6作用下的二乙基锌-苯甲醛加成反应，发现该催化剂具有不对称放大效应；-7，9，lO的催化效果也比较令人满意，光学产率80％以上，所得产物构型与催化剂构型一致。

From optical BINOL, the chiral phosphoryl azide compound was prepared. Its application as chiral auxiliaries in the stereoselective ring-opening of meso-epoxides was examined. No obvious asymmetric induction, however, was observed.

从光学活性的联二萘酚出发合成得到了手性磷叠氮化合物，并将其应用于环氧化合物的不对称开环反应中，考察了它作为手性辅助剂在该反应中的不对称诱导效果。

In the end, the application of chiral porphyrin is summarized. It is expected that chiral porphyrin would be effective catalysts in industrial production.

最后总结了手性卟啉研究成果的应用范围，并展望了手性卟啉在催化氧化方面的研究和发展方向。

In the end, the application of chiral porphyrin is summarized. It is expected that chiral porphyrin would be effective catalysts in industrial production. Contents

最后总结了手性卟啉研究成果的应用范围，并展望了手性卟啉在催化氧化方面的研究和发展方向。

D-lactic acid is considered to be a very important chemical compound as a chiral material or intermediate in organic synthesis. D-LA is a prosoma of many chiral compounds with applications not only in the pharmaceutical and cosmetic industry but also in highly efficient and lowly toxic pesticide and herbicide.

D-乳酸是重要的手性中间体与有机合成原料，是多种手性物质的前体，广泛应用于制药、化妆品和高效低毒农药及除草剂等领域的手性合成。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。