反应作用

Can induce the reaction of cleavage H atom from methyl on the ring of deactivated toluenes,such as nitrotoluene. The carbanions caused by base are the very important reaction intermediums, which determined the reaction rate and reaction effect.

该反应体系中，NaOH的加入对此催化反应起着相当关键的作用，研究表明强碱也能像温度一样促进苯环卜甲基的摘氢速度，使底物形成相应的硝基苯甲基阴离子，稳定的硝基苯甲基阴离子是氧化反应进行的重要中间体。

In the presence of catalytic rhodium acetate, ethyl 2-diazo-3-oxo-per fluoroalkanoates, reacted readily with nitriles to give a series of 5-fluoroalkyl substituted 1, 3oxazoles with high regio-selectivity through a metal carbenoid intermediate. The reactions of carbenoids with noncyclic vinyl ethers or cyclic vinyl ethers afforded dihydrofuroates in good to excellent yields. Interestingly, only vinyl C-H insertion compound was obtained concerning of the reaction of carbenoids with 2, 5dimethylfuran due to the steric hindrance of methyl group

醋酸铑分解2-重氮-3-氧代-全氟羧酸乙酯形成的金属卡宾作为1，3-偶极体，可以与一系列芳基或烷基取代的腈反应，高度区域选择性地生成一系列4-乙氧羰基-5-氟烷基取代的噁唑化合物；也可以与富电子的链状和环状的烯基醚反应，以优良的产率得到一系列氟烷基取代的二氢呋喃类化合物；而与2，5-二甲基呋喃的反应，由于甲基的位阻作用，只得到金属卡宾对呋喃3-位烯基碳氢键插入产物。

Perchloric acid as co-catalyst plays a key role in relation to the catalyst activity.

讨论了反应温度、氢气压力、Pd/C催化剂用量对反应的影响，以及高氯酸作为助催化剂在此反应中起的重要作用。

The calculated results show that vibrational state of HCl influences its reaction probabilities greatly, the feature of PESs plays considerable role for how rotational state affecting its reaction probabilities , and the reaction probabilities appear 'Gold Rule'.

其计算结果表明，振动量子态对反应几率影响很大；势能面的地形对转动量子态如何影响反应几率起重要作用；反应几率表现出&黄金规则&。

Emphasis analyzed,researched and estimated pinacol rearrangement actions,catalysts,reaction machine,related some reaction formulae etc,and characteristic,regulation relative with migration groups and more uses.

重点分析、研究和评述了频呐醇重排的作用、所用的催化剂、反应机理、相关的一些反应式、与迁移基团相关的重排特征和规律以及其较多的应用等，也论及了反频呐醇重排反应恰好是频呐醇重排的逆过程。

The plastein reaction is considered to involve the formation of polypeptides by a reversal of the usual peptide bond hydrolysis to produce "resynthesized" protein or polypeptides from a hydrolysate of protein.

类蛋白反应通常认为是酶水解的逆反应，是指在一定条件下，通过蛋白酶的催化作用将高浓度的蛋白质水解物与蛋白酶一起加热处理，生成一种类似高分子蛋白质物质的反应。

The pyridinium salts was transformed by the base to 1-hydroxy or 3-hydroxy-quinolizinylides, which undergo 1,3-dipolar cycloadditionreaction with alkenes,and then aromatizated to cycl[3,3,2]azinone in thepresence of oxidant.

实验证明，这是一个连续进行的多步反应：2-羰基吡啶鎓盐在反应中先生成1-羟基或3-羟基喹嗪叶立德，然后与烯烃起1，3—偶极加成反应，最后在氧化剂作用下脱氢芳构化而生成Cycl[3，3，2]azinone。

On the normotensive rat, bilateral microinjection of L-arginine (16 n mol/0.1 ul/site), a precursor of nitric oxide into the rVLM, caused a decrease in BP, HR and the pressor response induced by the dPAG stimulation, while microinjection of NG-methyl-Larginine (L-NMMA, 16 n mol/0.1 ul/site), a blockade for NO to form, into the rVLM bilaterally, caused an increase in BP, HR and the pressor response induced by the dPAG stimulation. There was no effect of both drugs mentioned above on the tachycardiac response induced by the dPAG stimulation.

五、在正常血压大鼠，于双侧rVLM微量注射一氧化氮前体(16nmol/0.1μl/site)可引起BP降低、HR减慢、以及电刺激dPAG诱发的防御性升压反应减弱；而于同区微量注射生成一氧化氮的拮抗剂N〓-甲基-L-精氨酸(16nmol/0.1μl/site)则可引起BP升高、HR加快、以及电刺激dPAG诱发的防御性升压反应增强；而上述两药对电刺激dPAG诱发的防御性加快心率反应均无明显作用。

The attacks in the four different places in the city, the number of causalities and deaths, number of army officers who died, how long the attack went, the role of media during the time of attack, people's response, the government's response, the response around the world.

在四个城市的不同地方的袭击，伤亡和死亡，谁的军官死亡，数目多久了攻击，在攻击时新闻媒体的作用，市民的反应，政府的反应，反应世界各地。

According to the characteristics of the larger start electric curent, start torque and the demagnetizing influence of the armature reaction of motereycle starter at the moment of starting, the formula of the largest demagnetizing magnetic- power is deduced and the magnetic method of separehng alnico is gnined on the basis of the largest dernagntizing magntic - power.

根据摩托车起动电机起动电流大、起动转矩要求高的特点，以及起动时直轴电枢反应和交轴电枢反应对永久磁铁的去磁作用，推导出最大去磁磁势的计算公式，给出了根据最大去磁磁势选择磁钢的方法，并通过实测证明电枢反应对起动电机性能的影响。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。