查询词典 catalyzed

The preparation of epoxides by reaction between alkyl peroxides and olefins catalyzed by high-valent transition metal complexes is one of the most important means of preparation of epoxides.

以高价过渡金属配合物为催化剂，催化烯烃直接环氧化反应是合成环氧化合物的重要途径之一。

In chapter 3, general reaction of a-hydroxy epoxides were introduced. We have developed a newly gold-catalyzed ring opening reaction ofα-hydroxy epoxides containing carbon cycle. We have disclosed the rule of ring opening reaction. And the plausible mechanism was proposed.

第三章：首先介绍了α-羟基环氧化合物的反应，其次介绍了一个新的金催化的含碳环骨架的α-羟基环氧化合物开环反应，总结了反应规律，提出了可能的反应机理。

The reaction of disproportionation of gum rosin catalyzed by AH non-noble metal catalyst was studied, and the effects of reaction temperature, reaction time, particle size of catalyst, and stir speed were investigated.

用AH型非贵金属催化剂催化松香歧化反应，考察了搅拌速率、催化剂粒度、反应温度、反应时间对反应的影响，建立了动力学方程。

In addition, the carbonylation reaction of alkyl halides catalyzed by cobalt complex has been explored.

本文对卤代芳烃的Heck偶联反应分别在均相和非均相催化体系中进行了研究和比较，并将使用效果较好的负载型钯催化剂和一些非钯金属催化剂应用于Suzuki偶联反应中。

The results are as follows: the DDM detergent dissolves the Cyt b6f better thanβ-OG detergent does; DDM can keep the Cyt b6f in native state, under which the hemes and Chl a experience specific environment, while theβ-OG make the complex in denatured state in some sort, under which the catalyzed electron transfer activity of the complex

结果表明，DDM去垢剂能使Cyt b6f处于较好的分散体系中，其中血红素和Chl a分子处于特定的蛋白环境中，不会导致Cyt b6f变性；而β-OG去垢剂会使Cyt b6f产生聚合现象，其中的血红素和Chl a与蛋白环境的相互作用减弱，和DDM相比其电子传递活性显著降低，Chl a单线激发态寿命延长，Chl a更容易被光

The conversion of the high-boiling components and low-boiling components of silane to valu- able methylchlorosilane by catalytic cracking and disproportionation catalyzed by acid treated active carbon andγ-Al_2O_3 was studied.

用酸处理的活性炭和γ-Al_2O_3组成双段催化剂，通过有机硅高沸物和低沸物的裂解歧化反应制备了甲基氯硅烷，考察了反应温度、质量空速等因素对反应的影响。

Release of ferric iron catalyzed the conversion of super oxide and hydrogen peroxide to the more toxic hydroxyl radical which has been shown to be an important mediator of ischemic brain edema.

三价铁释放，促使过氧化物和过氧化氢转化成毒性更大的羟自由基，这是缺血性脑水肿的一种更重要的递质。

The chiral ligands la-lf were used in the copper catalyzed asymmetric addition of diethylzinc to imines.

第二部分探索了一个新的含氮杂环丙烷的手性膦配体2的合成方法。

This thesis focuses on the transformation of amines and imines under the condition of Barbier-type reactions,and also the synthesis of aziridines catalyzed by the PhI_2/I_2 system.

本论文主要对锌试剂Barbier型条件下胺、亚胺的转化和PhI_2/I_2体系下氮杂环丙烷的合成做了一些研究。

In the fifth part, asymmetric synthesis of β,γ-trans-alkenyl α-amino esters was achieved by chiral phosphoric acid catalyzed transfer hydrogenation of β,γ-alkynyl α-imino esters. Utilizing Hantzsch ester as the hydrogen donor, both the alkyne and imine moieties of β,γ-alkynyl α-imino esters were reduced to yield β,γ-trans-alkenyl α-amino esters with up to 96% ee.

第五部分工作中，使用手性磷酸作为催化剂，Hantzsch酯作为氢源，β，γ-炔烃取代的α-酮酸酯亚胺中的炔键和亚胺官能团均被还原，以中等的收率和优秀的对映选择性（up to 96% ee）得到β，γ-反式烯烃取代的α-氨基酸衍生物。

Neither the killing of Mr Zarqawi nor any breakthrough on the political front will stop the insurgency and the fratricidal murders in their tracks.

在对危险的南部地区访问时，他斥责什叶派民兵领导人对中央集权的挑衅行为。

In fact,I've got him on the satellite mobile right now.

实际上 我们已接通卫星可视电话了