查询词典 optically isotropic

This article narrates the transformation of carbonyl group in optically active epoxy ketones under different reagents and enumerates some synthetic applications of this kind of transformation.

本文讲述了有机合成中光学活性的环氧酮化合物中酮羰基在不同试剂下的转化，并列举了一些相关的合成应用。

This article narrates the transformation of carbonyl group in optically active epoxy ketone s under different reagents and enumerates some synthetic applications of this kind of transformation.

本文讲述了有机合成中光学活性的环氧酮化合物中酮羰基在不同试剂下的转化，并列举了一些相关的合成应用。

Diffusing film, which is an optically transmissive component, is provided to redistribute the propagating light.

扩散片是个光穿透的元件，凡是能重新分配光分布的膜片都可定义为扩散片。

Besides, vicinal diamines and hydroxyamines were also synthesized in high enantioselectivities, which should be useful in asymmetric synthesis as optically active ligands.

同时，也高对映选择性地合成了一系列不对称反应中有用的手性邻二胺和邻羟胺化合物。

In accordance with the present invention, optically pure-hydroxycarboxylic acid can be prepared by culturing E. coli transformed with a recombinant plasmid which expresses intracellular PHA depolymerase of Ralstonia eutropha and PHA biosynthesis enzyme of Alcaligenes latus to give-hydroxycarboxylic acid.

根据本发明，光学纯的-羟基羧酸可通过培养用重组质粒转化的E.coli制备，所述重组质粒表达真养产碱杆菌的胞内PHA解聚酶和广泛产碱菌的PHA生物合成酶从而生成-羟基羧酸。

In order to develop an useful synthestic process, we have synthesized amides with various substitutents. The isoquinoline skeleton was constructed through Bischler-Napieralski reaction, followed by asymmetric reduction of the imine intermediates with a Ru complex to form the only chiral center. Finally, we connected the two phenyl groups by Heck reaction and effectively obtained optically active aporphine alkaloids.

为了发展一套实用的合成方法，我们首先制备於苯环上具有不同种取代基的苯乙醯胺，接著透过Bischler-Napieralski反应进行分子内合环，并利用钌金属对亚胺中间体进行不对称的还原反应，建立出产物中唯一的光学活性中心，最后再利用Heck反应连结两个苯环，就可以顺利得到具有光学选择性的阿朴吩类天然物。

Optically active axially dissymmetric binaphthyl derivatives have been extensively used as excellent chiral ligands in asymmetric catalysis and chiral recognition.

光学活性的联萘衍生物以其独特的立体化学性质作为优异的C2轴手性诱导源，已被广泛地应用到不对称催化反应和手性识别中。

In order to synthesize the functional polyquinolines (such as proton conducting polyquinolines and optically active polyquinolines) and investigate structure-property relationships, polyquinolines and polyanthrazolines containing isomeric pyrrole units or 1, 1'-binaphthyl in main chain were synthesized and their properties were studied.

建立了二乙酰吡咯的合成方法；合成并表征了四种二苯酰基-二氨基单体和五种新型的含吡咯基或联萘基的二乙酰基单体；并对部分合成方法进行了改进，简化了实验步骤，提高了产率。

From the optically active 2, 2'-dihydroxy-1,1 '-binaphthyl, through esterification, Kumada coupling, bromization, hydrolization and Wittig elimination reaction, 2,2'-diethynyl-1,1'-binaphthyl was obtained.

从光学活性的2，2'-二羟基-1，1'-联萘出发，经过酯化，Kumada偶联，溴化，水解和Wittig消除反应五个步骤，成功地获得了具有单一手性的的2，2'-二乙炔基-1，1'-联萘。

An inclusion complex -BINOL--Omeprazole or -BINOL--Omeprazole was first obtained from racemic omeprazole with chiral host --or --2, 2'- dihydroxy-1, 1'-binaphthyl in high selectivities, and thus both optically pure enantiomers of omeprazole were prepared as syrup with more than 99% enantiomeric excess, the overall yields of both two enantiomers are more than 60%.

首次发现光学纯R--或s--联二萘酚高效识别并包结R--或S--奥美拉唑，形成包结络合物的现象，并首次将包结拆分法应用于手性苯并咪唑类抗溃疡药物的制备，用一种构型的光学纯联二萘酚直接拆分奥美拉唑，可同时得到油状或糖浆状e.e。

The changes of the HAF after liver injury may be related to the volume of blood loss, the intraabdominal pressure and the pneumoperitoneum duration.

肝撞击伤伴失血后肝动脉血流量的变化与失血量、气腹压力以及气腹持续时间等有密切联系。

Reneging on our commitments to the world's poor cannot be an austerity measure, she said.

放弃我们给世界上的穷国的承诺不能成为一种紧缩措施。