查询词典 chiral

By the study of pseudoscalar meson chiral Lagrangian in QCD, we develop certain useful techniques and experiences which we can generalized to other fields, for example, the investigation of electroweak chiral Lagrangian.

通过赝标介子手征拉氏量的QCD研究，我们发展的计算方法与获得的经验完全可以推广到诸如电弱有效拉氏量等其它领域的研究上去。

Previously, we reported chiral 2, 5-disubstituted pyrrolidine derivatives as chiral catalyst ligands in the reaction of diethylzinc with arylaldehydes. Very high yields and enationselectivities have been achieved in this asymmetric addition reaction.

我们小组以前合成的具有C〓-对称性的五员氮杂环类手性配体在二乙基锌和醛的不对称加成反应中取得了优良的结果。

Chiral aminoalcohol is an important kind of chiral substance in the asymmetric synthesis, meanwhile, it is widely used in the field of medicine synthesis and the resolution of raceme.

手性氨基醇在不对称合成领域中是一类重要的手性源，同时，手性氨基醇在药物合成、外消旋体拆分等领域也具有广泛的用途。

The strategy of building the syn-anti chiral vicinal diolmoiety of sphingosine intermediate and the synthetic studies of anti-fungal antibioticssphingofungin using sugar as chiral pool are also described.

这些物质生理作用极强，但在机体中储存量极少、结构具有高度不均一性、生物和化学稳定性又差，它们的化学合成具有十分重要的理论和应用意义。

During these years (1997-2000) in the research area of annonaceous acetogenins 5 natural products and a number of chiral-pure analogs of annonaceous acetogenins have been synthesized using sugars as the starting materials. Their high activity and selectivity against cell line of colon tumor and a relationship between activity and configuration have been found too. In the respect of inhibitor of sialidase two new methodologies for the synthesis of chiral-pure 3-deoxy-ulosonic acid using hetero-Diels-Alder reaction or asymmetric propargylation as the key reaction were developed. On the topic of anti-leukemia marine natural product clavulactone a synthetic method based on the free radical cyclization and starting from sugar has been developed. In other title of PKC inhibited agent sphingosine a new synthetic route with SN2' as the key reaction has also been disclosed.

项目期间（1997-2000）在番荔枝内酯方面从糖出发合成了五个天然产物和一批手性纯的类似物，它们对肠癌细胞有很高的活性和选择性，并与构型有关；在唾液酸酶抑制剂方面发展了二类全新手性纯高碳糖的合成方法－杂原子D－A反应或丙炔基不对称加成为关键的反应；抗白血病海洋天然产物群柱虫内酯方面研究了由糖出发和自由基环化反应的合成方法；对PKC 起抑制作用的鞘氨醇方面也开创了新的合成途径－由糖出发并以SN2'反应为关键反应。

As the chiral source of asymmetric induction, the chiral ligands control the procedure of stereochemistry in reaction.

在手性催化反应中，手性配体是不对称诱导的手性源，控制着反应的立体化学过程。

The application of chiral sulfoxide's inclusion resolution in the preparation of chiral drugs and asymmetric Stre...

本论文研究和探索了手性亚砜包结拆分技术在手性药物的制备和不对称Strecker反应中的应用。

The application of chiral sulfoxide's inclusion resolution in the preparation of chiral drugs and asymmetric Strecker reaction was studied in this thesis.

本论文研究和探索了手性亚砜包结拆分技术在手性药物的制备和不对称Strecker反应中的应用。

Chiral homoallylic alcohol was prepared in this paper from asymmetric allylation of aldehyde with enantiomerically pure allylboronate tartramides such as chiral N,N'-diphenyl tartramide and N,N'-di...

本文以手性烯硼酸丙基酒石酸酰胺酯(如烯丙基硼酸-N，N'-二苯基酒石酸酰胺酯)为辅基，进行醛的不对称烯丙基化反应研究。

The present research work focuses on two aspects. On one hand, the most successful alkaloid-derived ligands have been attached to a soluble or insoluble support covalently, but additional OsO〓 is necessary to maintain the consistent catalytic activity during the reuse of supported chiral ligand in the next AD reaction. On the other hand, immobilization of osmium tetroxide based on microencapsulation, ion-exchange techniques, and osmylation of resins has made it possible to recover and reuse of the osmium, but failed to recover the chiral ligand at the same time.

目前的研究主要集中在两个方面：一方面，将手性配体共价键合到不溶或可溶性载体上制成负载手性配体，但在重复使用负载配体时必须补充OsO〓，才能保证催化活性不降低；另一方面，将OsO〓包裹在高聚物微囊内，或运用离子交换技术或共价键合的方法将OsO〓固载在树脂、硅胶或层状双金属氢氧化物材料上，但手性配体却不能同时回收。

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。