查询词典 chiral

In this chapter, we report the synthesis of an alkyl imidazo lium salt supported chiral sulfonamide ligand and its use and recycling in enantiosel-ective reduction of prochiral ketones to optically active secondary alcohols.

在这里我们报道了一种离子液体接枝的磺酰胺手性配体以及在前手性酮的不对称还原反应中的应用，获得了较好的对映纯过量，实现了手性配体的回收和重复使用。

The preparation of a novel chiral sulfonamide alcohol derived from natural camphor and its application in the titanium tetraisopropoxide-promoted enantioselective addition of diethylzinc to benzaldehyde is described.

由天然樟脑合成了一个新手性磺酰胺醇，并对其在二乙基锌对苯甲醛的对映选择性加成中的催化性能进行了研究，获得了73%化学产率和

Thus, the corresponding chiral sulfonium ylide was designed and its precursor was found to be readily available from the coresponing sulfide that was easily prepared from D-camphor in two steps.

从价廉易得的手性源 D-樟脑出发，合成了硫原子 b -位含有羟基的手性硅基烯丙基硫盐。

For example, Donagi and Witten found that the spectral curves of these integrable many body systens are identified with the Seiberg-Witten curves of the Seiberg-Witten theory. More recently, Dijkgraaf and Vafa found the information about the superpotentials of the chiral fields in some N = 1 SUSY gauge theories from the planar diagram of certain matrix integral.

例如，Donagi和Witten等人发现可积系统的谱曲线和Seiberg-Witten理论中的Seiberg-Witten曲线相互等价，Dijkgraaf和Vafa等人从正则矩阵积分的平面图中找到了N=1的超对称规范理论中手征场的超势的一些信息，同时N。

In our study, we adopt theQCD effective models, which have the properties of chiral symmetry andother underlying properties possessed by QCD, to study the hadron and nuclearproperties. We engage in our study in two aspects.

鉴于目前QCD在低能区域对强子性质与核性质描述的困难，在本文中，我们采用有着手征对称及其自发破缺等这些基本特性的QCD有效模型来描述强子与核的性质。

Tartaric acid has the symmetrical structure with two chiral carbon atoms, which is cheap and available.

酒石酸分子具有含两个手性碳原子的对称结构，且价廉易得。

New chiral boronic acid sensor was synthesized and its enantioselectivity towards tartaric acid was studied.

合成了新的由蒽及苯乙胺衍生的手性芳基硼酸荧光探针，研究了该手性探针对酒石酸的对映选择性识别作用。

First, two chiral glycerol derivatives were synthesized in twelve steps of reactions from natural tartaric acid.

据此，本论文确定ω-氨基溶血磷脂酸为和载体相连的LPA类似物，并尝试性地对其进行了合成。

A series of novel laterally O-difluoro-substituted terphenyl chiral liquid crystals have been synthesized through a simple route based on palladium-catalyzed cross-coupling reaction.

利用钯催化交叉偶合反应合成了一个系列的侧向邻二氟取代三联苯光活性液晶化合物。

The proposed method is simple, reliable and can be used for routine purity test and chiral separation.

该方法简单可靠、专属性强，可以作为常规的杂质检查手段。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。