查询词典 catalyzed

Phenylbenzimidazole was synthesized by solvent-free reaction of o-phenylenediamine and phenylacetic acid accelerated by microwave irradiation and catalyzed by HCl.

标题化合物C14H12N2在无溶剂条件下，用微波辐射法以盐酸作催化剂、邻苯二胺和苯乙酸为原料合成得到。

Kinetics characteristics of α- pinene isomerization catalyzed by activated carbon supported phosphotungstic acid was studied .

研究了活性炭固载磷钨酸催化α－蒎烯的异构化反应的动力学特征，研究表明，以环己烷作溶剂，α－蒎烯在活性炭固载磷钨酸上的异构化服从准一级动力学模型，其反应的表观活化能为100。

That is one of the best results in asymmetric catalyzed pinacol coupling reaction, which indicates that the tetradentate chiral Schiff-bases with C〓 symmetry and rigid structure may be developed into practical applications.

这说明，具有C〓对称性且其核心结构具有刚性的四齿Schiff--Base是最有希望获得有实用价值的新的手性化合物。

Discussing the mechanisms of the pinacol coupling reactions catalyzed by bidentate and tetradentate chiral ligands.

四、分别对二齿手性配体和四齿手性配体催化Pinacol偶联反应机理进行了探讨。

The 91% ee value was obtained by the pinacol coupling reaction catalyzed by 15mol% Schiff-base prepared by the chiral 1, 2-Diphenyethylenediamine and 2-pyridinecarboxaldehyde.

2由手性1，2-二苯基二胺与两分子2-吡啶醛缩合的Schiff-Base催化的Pinacol偶联反应，仅用15mmol％的量，可取得91％的ee值，这是不对称Pinacol偶联反应最好的结果之一。

Methods for synthesizing of pinacol are reviewed,the difference of catalytic effects and stereoselectivity with various catalytic systems are introduced in this paper.Highlights are laid on the mechanism and stereoselectivity of new synthetic methods catalyzed by low valent Samarium, Titanium and Trimethyl chlorosilane, etc.

频哪醇合成新进展* The Recent Progress in the Synthesis of Pinacol 李有桂蒋昌盛尤田耙**(中国科学技术大学化学系合肥 230026)本文综述了合成频哪醇的方法，介绍了不同催化体系的催化效果和立体选择性的差异，着重介绍了低价钐、低价钛、三甲基氯硅烷等新的合成频哪醇反应的机理和立体选择性。

Kinetic reaction behavior of neo- polyhydric alcohols with fatty acids catalyzed by sulfuric acid was studied.

比较了Brnsted酸，包括硫酸、磷酸、对甲苯磺酸，催化季戊四醇与脂肪酸的酯化反应行为，结果表明，硫酸催化酯化反应速率最快，能有效催化不同类型的新戊基多元醇与脂肪酸的酯化反应，羟基转化率达到98%以上。

Novel rod like phenylene thiophene based polyhydroxy amphiphiles, derivatives of gallic acid combining three hydrophilic 2,3-dihydroxypropyloxy groups and one alkyl chain via central aromatic linking units, have been synthesized by using Ni, Pd(0) catalyzed coupling reaction as key steps.

以Ni， Pd (0)催化的C-C偶合反应为关键步骤合成了基于苯联噻吩的棒状型多羟基两亲性分子，它们是以棒状芳香核为中心部分，一端带三重亲水的2，3-二羟基链，另一端为带一条烷基链的没食子酸衍生物。

The effect of silicon atom in substrate on the reaction rate and the stereoselectivity of enzymatic reactions was revealed by comparison of horse liver alcohol dehydrogenase-catalyzed stereoselective dehydrogenation of the three isomers of acetyltrimethyl propanone and their carbon analogues in aqueous/organic biphasic systems.

本项目通过对比在水－有机溶剂两相系统中，马肝醇脱氢酶催化三甲基硅烷丙酮的三个异构体及其碳类似物的光学选择性脱氢反应，揭示了底物中的硅原子对酶反应速度、立体选择性的影响规律，成功地合成了高对映体纯度的手性有机硅醇，并实现了辅酶的再生。

In chatpter three the mechanism of the gold-catalyzed cycloisomerization of propargylic pyridine was reported.

论文第三章将报道金催化的炔丙基吡啶衍生物的环异构化反应的机理研究结果。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。