查询词典 asymmetric

The substrate coupling reaction system catalyzed by recombinanted CAR wasconstructed. It can be used for asymmetric reduction of 2'-chloroacetophenone and coenzyme regeneration with 2-propanol or 2-butanol as the cosubstrate.

5应用重组CAR不对称催化还原2'-氯-苯乙酮，通过加入异丙醇或仲丁醇作为辅助底物，建立了底物耦联反应体系实现辅酶NADH原位再生的反应体系。

Results show that if the reaction is carried out in chloroform no asymmetric synthesis was observed.

结果表明，以相当于反应物量3％的TBAB作相转移催化剂，60℃反应5h，产物收率可达78％。

AIM: To synthesize 2 novel chiral ligands derived from cinchona alkaloids and study their catalytic performance in asymmetric dihydroxylation of 5 olefins.

目的：合成两种新的金鸡纳生物碱类衍生物配体并将其用于催化五种烯烃的不对称二羟化反应，考察催化效果。

The reported organocatalyst for asymmetric Michael additions include proline and its derivatives, chiral imidazolidinone derivatives, chiral urea, cinchona alkaloids and so on.

目前报道的催化Michael加成反应的有机催化剂主要有脯氨酸及其衍生物、手性咪唑啉酮、手性脲、金鸡纳碱衍生物等。

The Pt/FDU-14 catalysts can be effectively applied in the asymmetric hydrogenation of ethyl pyruvate after chirally modified with cinchonidine.

考察了经过手性分子辛可尼定修饰后的Pt/FDU-14催化剂在丙酮酸乙酯不对称氢化反应中的催化性能。

In the asymmetric hydrogenation of ethyl pyruvate catalyzed by 0 5% Rh/PVP TiO 2, the chiral modifier cinchonidine not only induces the enantioselectivity, but also accelerates the reaction rate greatly.

研究了辛可尼定作手性修饰剂修饰的负载型纳米铑簇合物催化剂(0 5 %Rh/PVP TiO2 )催化丙酮酸乙酯不对称氢化反应，在该反应中手性修饰剂辛可尼定不仅具有对产物生成的手性诱导作用，而且对反应具有明显加速作用；在优化反应条件后，反应的TOF和对映选择性分别可以达到 5 8 0min-1和

In the interior, the spaces left between the walls and roof and filled with clerestory windows, as well as the asymmetric light from the wall openings, serve to further reinforce the sacred nature of the space and reinforce the relationship of the building with its surroundings.

在内地，留下的空间之间的墙壁和屋顶装有clerestory Windows ，以及非对称光从墙壁开口，进一步加强了神圣性的空间，并加强关系的建设及其周围地区。

And extended them to asymmetric $3$-stage Clos network.

而我们也将这个结果推广到不对称的情况，甚至我们还在多重对数网路上也得到了同样的结果。

Unusual asymmetric temperature dependencies of the left and right coercivity,are observed for the first time.

研究了交换偏置和矫顽力的温度依赖关系。

One is to directly product credit information, and by means of this mechanism, men can decrease information asymmetric in credit market. Another is using of collateral device in loan contract, and this mechanism is indirect.

一种是对信用信息的直接生产机制，该机制可以减少信货市场的信息不时称；一种是通过设置抵钾条款，发挥抵押对信用信息的间接信号传递功能。

I was up all night because I was in pain, she said.

我整夜，因为我在疼痛，她说。

A crow caws /craoks.

乌鸦叫。 51-论文网