chiral center

The introduction of chiral center and lateral fluorines enable the liquid crystals to give unusual smectic textures .

由于在分子中引入了手性中心和侧向氟原子，使得液晶呈现出不同寻常的近晶相织构。

Bisoprolol fumarate has one chiral center , and pairs of enantiomers , respectively for the R / S configuration .

富马酸比索洛尔有一个手性中心，两个对映异构体，分别为R/S构型。

A new methoed of specifying the r / s configuration of a chiral center

快速确定R·S构型的一种新方法

As natural biocatalysts , enzymes catalyze chemical reactions with high catalytic efficiency and stereoselectivity and mild conditions , which can be not only used for the efficient resolution of racemic drugs and related synthons , but also the direct construction of chiral center of optically active drugs .

作为天然的生物催化剂，酶催化化学反应具有催化效率和立体选择性高、反应条件温和的特点。酶不仅适于外消旋药物及其合成子的有效拆分，而且可用于光学活性药物手性中心的直接构建。

Among various methods to synthesize optically active propargylic alcohols , the asymmetric alkynylation of aldehydes is particularly useful because it simultaneously forms a carbon-carbon bond and a chiral secondary alcohol center in one single step .

在众多合成手性丙炔醇的方法中，端基炔对醛的不对称加成是在形成碳-碳键的同时生成一个手性二级碳中心，相较于其它方法有着显著的优势。

According to the numerical results , the classification of the vibration modes for chiral tubes at the center of Brillouin zone were analysed .

基于实际的数值计算，讨论了Brillouin区中心Γ点手性管晶格振动模的分类；

High yield and enantioselectivity were received in the cases of aromatic aldehydes as substrates especially when the employed chiral ligand has a hydroxyl group attached to the chiral center .

当芳香醛为底物时，尤其是在手性中心连有羟基配体存在下，不对称加成产物得到很高的产率和对映选择性。

Inherently chiral calix [ 4 ] arenes are a typical chiral macrocyclic compounds in which chirality generated from the asymmetric arrangement of non-chiral substituents free from a chiral axis , a center chiral or a planar chiral molecules and other chiral factors .

固有手性杯芳烃是一类典型的手性大环化合物，它们的手性来自杯芳烃骨架非手性取代基的不对称排列，而非以往我们所见过的轴手性、中心手性或平面手性等分子。