查询词典 chiral

The mechanism of chiral inducement of this compound is complicated because of the existence of supramolecular structure.

因为超分子结构的存在，此类化合物的手性诱导机制比较复杂，与多种因素有关。

Herein, using grafting strategy we have developed a new kind of sulfamide-amine alcohol ligands by grafting a activator to the traditional aminoalcohols, which led to more rigid tridentate coordination model and benefit to the control of chiral surrounding.

本文提出一种嫁接策略设计新的手性配体，即在传统的氨醇配体上嫁接上一个活化剂就可以得到一类新型的手性磺酰胺-氨醇配体。

Diltiazem is an important coronary vasodilating drug and contains two chiral centers while only the (2S, 3S)-isomer has the desired activity.

地尔硫卓是重要的心血管药物，在其分子结构中含有2个手性中心，可产生4个立体异构体，其中只有(2S， 3S)－异构体具有药理活性，因此其立体选择性合成具有很大的挑战性。

At last,a convergent and general protocol to marine natural product,as demonstrated by the enantioselective total synthesis of malyngamides O,P,Q,R, 5"-epi-Q and 5"-epi-R bearing terminal vinylic chloride structure,was developed in detail.E,(7S)-7-methoxytetradec-4-enoic acid was prepared using the above described Johnson-Clainsen rearrangement,the terminal vinyl chloride was constructed using Wittig reaction as key step,the pyrrolidone derivative was constructed using L-serine as natural chiral pool.Starting from the synthesis of malyngamides O and P to explore the general route,an aldol reaction of methyl acetate with the vinyl chloride part in the presence of LDA gave the skeleton of amine portion,followed by amidation with the fatty acid finished the synthesis of malyngamide P.

先以malyngamides O和P为试点探索通用合成路线，将乙酸甲酯和烯氯部分在LDA存在下进行aldol反应得到氨部分的骨架，再将手性不饱和脂肪酸和氨部分进行酰胺化反应完成了malyngamide P的合成，将P在碱性条件下进行烯醇甲基化反应完成了malyngamide O的全合成。

The effects of factors such as complex coupling, interconvert isomer, suffocate spin and chiral carbon on the appearance of the spectra were studied and discussed in the paper.

采用600MHzNMR谱仪较详细地研究了不同类型有机磷农药的NMR谱图，分析了复杂偶合、直变异构、受阻旋转、手性碳原子等因素对有机磷农药的NMR谱图影响。

The design and synthesis of effective chiral ligands play important roles in transition-metal catalyzed asymmetric reactions.

在金属介入的不对称催化反应中，手性配体的设计合成扮演着极重要的角色。

In this thesis, we have designed several chiral a-aminoxy acid monomers with fluorinated side chains.

本论文设计了一系列含氟侧链的a-氨氧基酸的单体进行合成，并对它们的二级结构进行研究。

Furthermore, the degree of optical purity of pesticides is osculating with the degree of chiral intermediate.

手性药物的光学纯度高低直接和生产该药物的手性中间体的光学纯度密切相关。

Makesthe chiral in the organic synthesis to analyze the experiment, theanhydrous non- oxygen experiment, the catalysis pressurizes thehydrogenation experiment.

在有机合成中做过手性拆分实验，无水无氧实验，催化加压加氢实验。

Huaren has the expertise in Chirality Technology,especially in Asymmetric Synthesis as well as Chiral Separation.Huaren stands for high reputes in the circles for its high quality,credit and good service.Our key words is

公司主要从事医药原料药的生产，致力于高新技术产品的研究开发，并在手性药物中间体和多肽类氨基酸保护剂上取得了长足进步。

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％。