查询词典 reaction

From the reaction mechanism, which involved formation of benzodiazepinium ethoxycarbonylmethylate, the reaction mechanism, which involved formation of benzodiazepinium ethoxycarbonyl- methylate followed by cycloaddition reaction, was tentatively proposed.

通过研究反应过程中分离出的副产物反丁烯酸二乙酯III和4，5-二氢吡唑-3，4，5-三羧酸乙酯IV，初步提出了反应经过乙氧羰基甲基化苯并二氮杂卓翁中间体V再发生环加成反应的机制。

It was found that moisture in the system of reaction is main reason that lead to deactivation of ionic liquids. The reaction mechanism of transalkylation reaction of methylnaphthalene and 1,2,4,5-tetramethylbenzene catalyzed by chlorine-aluminate ionic liquids has been proposed.

考察了离子液体的循环使用情况，分析确定了离子液体的失活原因，认为反应体系中的微量水使离子液体水解是造成离子液体失活的主要原因。

The optimum reaction conditions were: n :n=1:1.10, reaction temperature 85~95 ℃, reaction time 4 h, water carrying agent A was 50% base on the morpholine volume, the yield and purity of the product were 94.3% and 99.6%.

其最佳反应条件为：n：n＝1：1.10，反应温度为85~95℃，反应时间为4 h，带水剂A的用量为吗啉体积分数的50%，产品收率为94.3%，纯度为99.6%。

The soil urease and invertase activity effected by Hg was investigated in different fertility soils. The results show that soil urease activity、maximum reaction velocity (Vmax、Vmax/Km) and reaction velocity constant k have remarkably negative correlation with Hg concentration so that these can be used as ecological indexes of soil polluted by Hg, Km changes a little indicating that the reaction mechanism of Hg and urease is nonreversible competitive restraint. Urease of low soil fertility is more damaged by Hg than that of high soil fertility, with severe pollution at Hg concentration of 6.00 and 14.79mg/kg respectively; while invertase is less sensitive to Hg than urease. Cultural time has less influence on the relationship of soil enzyme and Hg concentration.

对不同肥力土壤脲酶和转化酶活性受汞影响进行了研究，结果显示，土壤脲酶活性、最大反应速度Vmax 、Vmax/Km和反应速度常数k与汞浓度呈现显著或极显著负相关关系，表明其可作为土壤汞污染的生态指标；米氏常数Km则变化较小，表明汞与脲酶作用机理为不可逆竞争抑制；低肥力土壤脲酶比高肥力土壤脲酶受汞毒害作用更强，当汞浓度分别为6.00和14.79mg/kg时即达到严重污染；而转化酶对汞的敏感性较差；培养时间对土壤酶与汞浓度间关系影响较小。

Neutron capture reaction i.e reaction, it is an important neutron nuclear reaction.

中子俘获反应即反应，是一种重要的中子核反应。

Now at this point kind the train of thought solving a problem of the problem makes an analyse. 1 catching corporeal impact to counteract reaction opportunely is the reaction that shows acid and alkaline reaction generate salt and water.

现就此类题的解题思路作一例析。1巧抓物质关系中和反应是指酸和碱反应生成盐和水的反应。

By using a fracture simulation unit,the regularity that temperature,flow rate and fracture width influence on HCl/dolomite reaction rate is investigated.The sequence of temperature,flow rate,acid concentration and fracture width influence to the acidic rock reaction rate is also studied in a four factors and four levels orthonormal test,and the sequence that acid concentration＞flow rate＞temperature＞fracture width is found.At the last,the possible HCl/dolomite reaction mechanism model which can explain the influence factors is derived.

文中利用人工模拟裂缝装置，研究了温度、注酸排量、裂缝宽度等因素对盐酸/白云岩反应速率的影响规律；并采用四因素四水平的正交试验，综合考察了温度、排量、酸浓度、缝宽四种因素对酸岩反应速率的影响的主次顺序，发现对酸岩反应速率影响力的大小次序为：酸浓度＞排量＞温度＞缝宽；最后，提出了盐酸/白云岩反应可能的机理模式，并根据这一模式对诸因素的影响进行了合理的解释。

Under basic conditions p-nitrotoluene was oxidized to p-nitrobenzoic acid with oxygen or air. The reaction parameters, such as reaction temperature, reaction time, substrate concentration were optimized and 75% of p-nitrobenzoic acid was obtained under proper conditions.

论文探讨了在碱性条件下，用空气／氧气氧化对硝基甲苯的反应，得出了温度、时间、底物浓度、催化剂用量等工艺参数对反应的影响，在较佳的工艺条件下，对硝基苯甲酸的收率可达到75％左右。

The AM1 method was used for a quantum chemistry study of the phenol hydroxylation reaction mechanism. The possible reaction path of the phenol and oxyhydrogen free radical was optimized, and the structures of stable intermediates in the reaction mechanism were also obtained.

本文还首次采用AM1方法对苯酚羟基化反应机理进行了量子化学研究，将苯酚与氢氧自由基的反应沿可能的反应路径进行几何优化，得到反应历程上相关驻点稳定构型的三维结构。

Whenpyridine was used as reductive decomposing agent, the expecting cholest-4-en-3,6-dione-22-al was obtained. However, when Zn/HOAc was used to decomposethe ozonide, C-4,5 double bond was further reduced to give cholest-3,6-dione-22-al as main product. 2 For the side-chain construction of compound (1), the solid-liquid phase-transfer Wittig reaction was used. When (3-methyl-2-oxobutyl)-triphenylarsonium bromide was used as reagent, the reaction can be carried out inmild reaction condition and the yield is higher than that when phosphorane wasused.

但使用Zn／HOAc作为分解剂时，却得到其氢化产物胆甾-3， 6-二酮-22-醛；2在甾体支链引入过程中，采用固-液相转移Wittig反应的方法，用(3-甲基)-2-氧丁基三苯基溴化胂作为试剂，反应在非常温和的条件下便可完成，而且产率比传统采用膦烷的方法更高；3在对某些甾酮化合物的选择性还原反应研究时，发现在〓还原体系中，当加入某些金属离子后，反应有更好的区域选择性和立体选择性。

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。