查询词典 chiral

This requirement may be satisfied by the submission of information such as the following: name (generic name, chemical name, code number ); Chemical Abstracts Service number if available; description (e.g., appearance, color, physical state ); molecular formula and molecular weight; structural formula (including ionic state if applicable ); stereochemistry identifying chiral centers, cis-trans isomerism, etc.

有的话、描述（如：外观、颜色、物理状态）、分子式和分子重量、结构式、立体化学（找出手性中心、顺式贯穿异性等）、对映结构体或固态形式比率（如：外消旋物、规定的异构体、对映异构物和固态形式的混合物）、溶解性档案、分隔系数、溶液pH值、解离常数、熔点和沸点、拆射率、精确重力。

According to the strong reducibility of lithium aluminium hydride and asymmetric selectivity of binaphthol,the authors reduce camphor into D-borneol by using D-binaphthol modified lithium aluminium hydride as chiral reagent.

根据氢化铝锂的强还原性和联萘酚的不对称选择性，用右旋联萘酚改性过的氢化铝锂为手性试剂，把樟脑还原成右旋龙脑。

Optically active ethyl-3-hydroxybutyrate,a useful chiral synthon,was prepared by stereoselective reduction of ethyl acetoacetate of the bread yeast in organic solvent.

利用面包酵母在非水相中不对称还原乙酰乙酸乙酯，制备了光学活性的手性化合物S-3-羟基丁酸乙酯。

The present paper dealswith the preparation of surfactant (deoxycholic sodium and tetrabutylammonium bromidemixture) coat bonded to silica gelwith alkyls aswell as its application to the separation of chiral enantiomers.

提要： 研究脱氧胆酸钠和溴化四丁铵的混合态表面活性剂涂层烷基键合硅胶固定相的制备和它在手性对映体分离中的应用。

Herein we mainly discuss the asymmetric addition of terminal alkynes to aldehydes and ketones using commercially available chiral pool and their derivatives.

这篇论文论述了商业化的手性源及其衍生物配体催化的末端炔对醛和酮的不对称加成反应的研究。

The asymmetric addition of terminal alkynes to aldehydes and ketones is an important method of synthesizing chiral propartyl alcohols and tertiary alcohols, which are important pharmaceutical intermediates.

末端炔对醛和酮的不对称加成是合成光学纯的炔丙醇和手性叔醇的重要方法，是不对称催化的重要研究课题之一。

In this thesis, we study baryon in the constituent quarkmodel with the chiral dynamics.

本论文在具有手征动力学的组分夸克模型中研究了重子谱和重子的电磁性质。

In the past years, SU (3) chiral quark model has been used successfully in explaining the experimental data of groundstate baryons, nucleon-nucleon and nucleonhyperon scattering etc..

过去，手征SU（3）夸克模型在解释基态重子结构和性质、核子-核子及核子-超子散射等方面的实验数据中取得了成功。

Under the framework of constituent quark model, according to the effective degrees of freedom used, we have the Glashow-Isgur model , the spontaneous chiral symmetry breaking model, the hybrid model and so on.All of these models are successful to describe the properties of the mesons and baryons.

组分夸克模型是一种非相对论模型，根据所采用的有效自由度的不同，组分夸克模型又可以分为好几种具体的模型，主要有：Glashow-Isgur模型、手征对称自发破缺模型和&杂化&模型等。

All the prepared compounds were characterized by 〓H NMR、〓P NMR and elemental analysis. The catalytic activity of each prepared chiral phosphorus compound in the borane reduction of prochiral ketones was studied.

对每一种手性磷化合物，考察了其作为配体催化剂在潜手性酮的不对称硼烷还原反应中的催化效果，讨论了影响不对称诱导的各种因素。

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％。