对映的

Under appropriate conditions, the conversion of acetophenone could be as high as 100% and the enantiomeric excess of-1-phenylethanol exceeded 99.0%.

在合适的条件下底物苯乙酮的转化率高达100%，产物-1-苯基乙醇的对映体过量值大于99.0%。

These ligands were found to be very effective in construction of quaternary carbon centers by using asymmetric allylic alkylation.

这类配体在前手性亲核试剂的不对称烯丙基化构筑手性季碳中心的反应中，显示了较好的反应活性及对映选择性。

The ligands were found to be effective in palladium-catalyzed asymmetric allylic alkylation to construct chiral quaternary carbon center.

这类配体在前手性亲核试剂的不对称烯丙基化构筑手性季碳中心的反应中，显示了较好的反应活性及对映选择性。

L-prolinamide/PPTS system was developed to catalyze Robinson annulation of 1,3-cyclohexanedione derivatives. Using this system, the functionalized carbon chain of Wieland-Wiescher ketone could be synthesized in high enantioselectivity, which was a useful synthon for structural diversity of total synthesis of natural product.

二、发现了L-prolinamide／PPTS体系可以催化Ronbinson环化1，3-环己二酮衍生物，实现含季碳且具有多官能团侧链的Wieland-Wiescher酮高对映选择性的合成，为天然产物结构多样性的合成奠定了基础。

Whereafter,we achieved a highly enantioselective approach towards the synthesis ofβ-substituted chiral ketones utilizing Oppolzer\'s sultam as chiral auxiliary.The-and-enantiomer of target chiral ketones were obtained with up to 99%ee.

应用手性辅剂樟脑磺内酰胺的手性诱导作用，高对映选择性地合成了一系列β-芳基取代手性酮，其ee值高达99%，可用于药物及其它精细化工中间体的不对称合成。3。

In Yingxiu, close to the Sichuan earthquake's epicentre, he paid tribute to Beijing's efforts.

在映秀，这个接近震中的地方，潘基文对中国的努力高度称赞。

More than 50% of the commercial drugs available worldwide have stereogenic centers and most of them are marketed as racemates at present.

目前，大多数药物以外消旋体给药为主，而以光学纯的对映体给药是大多数手性药物的发展趋势。

Finally, we demonstrate the transformation of β-hydroxy nitriles to a variety of diastereomerically pure and highly functionalized acyclic and heterocyclic γ-amino alcohol derivatives.

最后， 本文介绍了由β-羟基腈向各种纯非对映异构体，多功能性的开环和杂环γ-氨基醇衍生物的转化反应。

METHODS: After a single ip dose of trans-T hydrochloride or Ml, the rats were killed by decapitation. A high performance capillary electrophoresis method was used to determine the concentrations of enantiomers of trans-T and Ml in the serum and different brain tissues, including cerebrospinal fluid, cerebral cortex, corpus striatum, hypothalamus, cerebellum, and medulla oblongata.

大鼠ip单剂量的盐酸trans-T或Ml后，采用高效毛细管电泳法测定血清和不同脑组织中trans-T及Ml对映体的浓度，脑组织包括脑脊液、大脑皮层、纹状体、下丘脑、小脑、延髓。

High activity and e.e. couldonly be obtained with Pt particles larger than about 3-4 nm in diameter.

值，这是目前α-酮酯不对称氢化中所报道的最高的对映选择性。

Lugalbanda was a god and shepherd king of Uruk where he was worshipped for over a thousand years.

Lugalbanda 是神和被崇拜了一千年多 Uruk古埃及喜克索王朝国王。

I am coming just now,' and went on perfuming himself with Hunut, then he came and sat.

我来只是现在，'歼灭战perfuming自己与胡努特，那麼，他来到和SAT 。