查询词典 chiral

The discovery of the chiral structural motifs will open up the possibility for the rational design of new chiral microporous materials.

具有手性结构单元的结构的发现将有助于新的手性微孔材料的定向设计和合成。

The selection of developing chiral drug s as strategy is on the important basis of chiral pharmacology study results but it is necessar.

基础生物化学研究推动手性药物市场持续增长，2 0 0 1年单一对映体药物市场为 14 70亿美元，占世界药品市场 4 10 0亿美元的 36 %。

The osmium-catalyzed asymmetric dihydroxylation of olefins provides one of the most effective methods for the preparation of vicinal diols. Almost all kinds of olefinic substrates can be transformed to the corresponding diols by means of AD reaction. The chiral osmium catalyst is generated in situ by the chiral ligand complexing with OsO〓 in the reaction.

手性锇催化剂催化的烯烃不对称二羟基化反应是合成手性邻二醇最有效的途径之一，可以将几乎所有类型的烯烃转变成相应的手性邻二醇，因此广泛地应用于药物、天然产物以及精细化工产品的合成。

Using one chiral ligand of each type respectively to investigate the infection of the structure and the amount of chiral ligands, the structure of reactant, the temprature and duration, solvent and reductive metal in pinacol coupling reactions.

三、系统考察了手性配体的结构和用量、底物结构、反应温度、时间、溶剂及还原金属对Pinacol偶联反应的化学产率、非对映选择性和对映选择性的影响。

Expanding pinacol reductive coupling reaction into asymmetric one with both diastereoselectivity and enantioselectivity may lead to its application in synthesising medicaments and biologic active compounds with structure of vicinal diol. Asymmetric pinacol coupling reaction is also the most compact and effecient method in synthesizing chiral ligands or chiral auxiliary with C〓 symmetry.

将这一反应发展成为既有高度的非对映选择性，又有高度对映选择性的不对称偶联反应在合成许多含有手性邻二醇结构的药物或生物活性物质将有更重要的应用，同时不对称Piancol偶联反应也是合成C〓对称性的邻二醇多用途手性配体或手性助剂的最为简捷有效的方法。

And the corresponding chiral tertiary propargylic alcohols were obtained with enantiomeric excesses of up to 86%, which provided a simple, practical and inexpensive method to generate chiral tertiary propargylic alcohols.

经过筛选、测试，发现一β-磺酰胺基醇-钛复合物可在温和条件下，有效促进炔基锌对简单非活化酮的不对称加成，并且得到相应的手性三级炔丙醇，ee值达到了86%。

In thesecond chapter, eleven 1,3,4-oxadizoles bearing chiral pyrazolyl moieties(4a-k) andfive triazolotriazines bearing chiral pyrazolyl moieties(5a-e) were obtained from5-[(1"S)-1",2-diacetyl-oxyethyl]-1-phenylpyrazol-3-carboxaldehyde(1) with arylcar-bohydrazide or (5-aryl-1,2,4-triazin-3-yl)hydrazine through an intramolecular1,3-dipolar cycloaddition in the presence of the non-metal oxidant IBD.

其中第二章介绍了以D-葡萄糖为原料制得的5-[(1′S)-1′，2′-二乙酰氧基乙基]-1-苯基吡唑-3-醛(1)分别与芳基甲酰肼、(5-取代苯基-1，2，4-三嗪-3-基)肼反应，在无金属氧化剂—IBD引发下，发生分子内1，3-偶极环加成，采用&一锅煮&法合成了11种含手性吡唑基的1，3，4-噁二唑类化合物(4a-k)和5种含手性吡唑基的三唑并三嗪类化合物(5a-e)。

With the need of pure isomer of racemic mixture increasing, more and more attentions have been paid to the chiral resolution membrane technology, which has been known as an energy-saving technology and considered as an easily scale-up chiral resolution technique.

手性拆分膜技术作为一种低能耗和易于工业放大的手性拆分技术，近年来随着单一手性物质需求的日益增长得到了广泛的关注。

The facts indicate that apart from the asymmetric induction of chiral diamine backbone,sterically hindered substitute groups on the aromatic rings,and the presence of sp~3-hydridized amino donors and its N,N\'-disubstituted groups in chiral SalanCrX complexes all play important roles in controlling polymer stereochemistry and enantioselectivity.

研究发现除了手性二胺骨架的不对称诱导作用，苯环上的大位阻取代基、N，N\'-二取代基的位阻作用以及N原子上sp~3杂化的供电子效应都对调控聚合物的区域和对映体选择性有很大作用。

The ligand of the chiral Schiff base and acetylacetone vanadium are subjected to complexation in situ, hydrogen peroxide is taken as an oxidant, aryl alkyl thioether asymmetric oxidation reaction is catalyzed in a toluene or dichloromethane solution under low temperature or room temperature, enantioselectivity of chiral sulphoxide is 72 percent to 95 percent ee, and yield is 42 percent to 83 percent.

将上述手性西佛碱配体与乙酰丙酮氧钒原位络合，采用双氧水为氧化剂，在甲苯或二氯甲烷溶液中低温至室温下催化芳基烷基硫醚不对称氧化反应，手性亚砜的对映选择性为72％-95％ee，产率为42％-83％。

They weren't aggressive, but I yelled and threw a rock in their direction to get them off the trail and away from me, just in case.

他们没有侵略性，但我大喊，并在他们的方向扔石头让他们过的线索，远离我，以防万一。

In slot 2 in your bag put wrapping paper, quantity does not matter in this case.

在你的书包里槽2把包装纸、数量无关紧要。