查询词典 asymmetric

A gas chromatographic method to determine the conversion of asymmetric hydrosilylation of acetophenone has been established.

建立了由气相色谱法测定苯乙酮不对称硅氢化反应转化率的定量方法，操作简便、迅速，重复性和精密度较好，多个样品各重复6次的变异系数均小于1％，且结果与1HNMR法测定结果一致。

The yeast cells asymmetric reduction of aromatic ketone was also study in this work when the acetophenone was as the model substrate.

最后，以2一辛酮(2一Octanone)为模型底物研究了酵母细胞不对称还原前手性脂肪酮的反应特性。

Rhodium-catalyzed asymmetric 1,4-conjugate addition reaction is one of the most efficient methods for the carbon-carbon bond formation.

铑催化不对称1，4-共轭加成反应是一种非常有效的碳—碳键形成方法。

In addition,it also discusses the establishment of incentive mechanism and considering the existence of asymmetric information in the insurance agency market, gives some advice about drawing up an optimal incentive contract simultaneously.

保险市场中介是现代市场经济中介体系的组成部分，它主要由三种特定的中介人构成，即保险代理人、保险经纪人和保险公估人。

1The axial evolution law on the structure and the aerodynamic characteristics of the asymmetric flows around slender bodies of revolution at incidences is summarized:whether the flow asymmetry is powerless or powerful,the flow always appears in the structure that lee-side vortices rise,and shed vortices form,and new lee-side vortices come into being alternately on opposite sides of a slender body of revolution axially from nose apex downstream to afterbody,and always induces the sectional side force of waving quasi-sinusoidally downstream axially.

1总结出细长旋成体有攻角非对称绕流流场结构和气动力特性的轴向演化规律：无论非对称性强弱，沿轴向从头部尖顶往后体，非对称绕流总是呈现为左、右两侧背涡交替从物面向上飘起、形成脱落涡、再衍生出新生背涡的流场结构，并诱导出沿轴向呈类似正弦曲线形式振荡分布的截面侧向力。

In this paper, chiral molybdenum or tungsten 2'-pyridinyl alcoholate complex catalyzed asymmetric epoxidation of cis-1-propenylphosphonic acid in H2O was reported.

目前磷霉素的生产是通过以Na2WO4为催化剂、在乙醇中以30%的H2O2将顺丙烯膦酸环氧化得到消旋产物，再利用α-苯乙胺进行拆分而得到[2，3]。

The asymmetric aldol reaction is one of the most important methods of forming carbon-carbon bonds.

不对称羟醛缩合反应是有机合成中立体选择性地形成碳碳键的最重要方法之一。

Its zinc complex was applied in asymmetric direct aldol reaction of acetone and p-nitrobenzal...

设计合成了一种NOBIN衍生的手性配体，初步研究了该手性配体的双核锌配合物在对硝基苯甲醛和丙酮的不对称直接醇醛缩合反应中的催化应用，20℃和20mol％催化剂量下，获得了32.5％ee和72％收率的产物。

Synthesis of novel 4-long alkoxyl-L-prolines and their application in catalytic asymmetric direct aldol reaction.

一、研究了新型长链烷基脯氨酸的合成及其作为有机小分子催化剂催化的直接不对称Aldol反应 1。

In order to examine the catalytic activity of the new catalysts, we have carried out the direct asymmetric Aldol reaction of tetrahydro-4H-thiopyran-4-one with aldehydes.

催化剂的基本结构单元如下：为了检验新型有机催化剂的催化活性，我们研究了硫代四氢吡喃酮和各种醛的直接不对称Aldol反应。

As she looked at Warrington's manly face, and dark, melancholy eyes, she had settled in her mind that he must have been the victim of an unhappy attachment.

每逢看到沃林顿那刚毅的脸，那乌黑、忧郁的眼睛，她便会相信，他一定作过不幸的爱情的受害者。

Maybe they'll disappear into a pothole.

也许他们将在壶穴里消失