查询词典 catalysis

In the course of our study the chemistry of arenes contaning allylic acetates moiety under the catalysis of palladium, we found an efficient synthesis of benzocycles via intramolecular Friedel-Crafts reaction of halogen free 6-acetoxy-4alkenyl arens.

我们在设计钯催化的碳—氢键活化时，发现了含有烯丙基醋酸酯侧链的芳烃的三氟醋酸促进的分子内的Friedel-Crafts反应，从而为有效合成苯并六元环结构提供了一个方便的方法。

Selective oxidation of methane and light alkanes is one of the most challenging problems in terms of heterogeneous catalysis and surface s...

甲烷和低碳烷烃选择性氧化是多相催化和表面科学领域最具挑战性的前沿研究课题之一。

Selective oxidation of methane and light alkanes is one of the most challenging problems in terms of heterogeneous catalysis and surface science.

甲烷和低碳烷烃选择性氧化是多相催化和表面科学领域最具挑战性的前沿研究课题之一。

Keywords: Enantioselective catalysis; phosphorus reagents; silylcyanation; borane reduction

中文关键词：对映选择催化；磷试剂；硅氰化；硼烷还原

Opper bromides have been used as catalysis in organic synthesis, batteries, gas sensors and lasers.

uBr已经用于有机合成的催化剂，电池，气体传感器和激光器。

In this dissertation, the practical significance and the recent development of non-phosgene synthesis of N-substituted carbamates are reviewed briefly, as well as the application of ionic liquids in catalysis.

本论文综述了非光气合成N-取代氨基甲酸酯类化合物的现实意义和研究进展，以及离子液体在催化反应中的应用。

A chiral phase transfer catalyst, N-benzyl quinine bromide, was synthesized from natural chiral compound. And 2,5-bimethyl-4-(3-nitrobenzene)-1,4-bihydrogenation pyridine-3--4-methyl formate (viz. nitrendipine) was synthesized by this chiral phase transfer catalysis, and characterized by elemental analysis, infrared spectrum,1H nuclear magnetic resornace, and X-ray single-crystal diffraction.Key words: ammonium; chiral phase transfer catalyser; crystal structure

通过对天然手性物质进行修饰合成手性相转移催化剂N-苄基溴化奎宁，并对目标分子2，5-二甲基-4-(3-硝基苯)-1，4-二氢吡啶-3-甲酸乙酯-5-甲酸甲酯进行不对称催化合成，并通过红外光谱和核磁共振氢谱对化合物进行了表征，用X射线单晶衍射法测定了该化合物的晶体结构。

Increased rate of reaction, in the presence of catalyzers, is called catalysis, or catalytic action.

有催化剂时，反应速度的加快叫做催化作用。

This thesis is concerned with studies on the ring opening reaction catalyzed by gold catalysis via carbon-carbon bond cleavages.

本文主要研究了金催化碳碳键断裂的开环反应，全文共分为三个部分：第一章：对均相金催化研究进行了总结，综述了均相金催化的研究进展。

The most important factor that determines cracking effect of dolomites is their specific surface area after calcination. The bigger the specific surface area the better is catalysis effect.

决定白云石催化裂解效果优劣的最重要的因素是白云煅烧处理后比表面积的大小，比表面积越大，催化效果越好。

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％。