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Bis (P—bromobenzylamino) ethane and 1,2—bis (m—Iodobenzylamino) ethane may be prepared by condensation of the corresponding halo benzaldehyde with ethylenediamine and followed by catalytic hydrogenation of the Schiff's bases over Pto_2 in glacial acetic acid solutions: Both Ⅱa and Ⅱb may react in neutral mediam with aldehydes to form well—defined crystalline tetrahydro—imidazole, which may be served as derivatives of identification for aldehydes: Under the same condition, however,Ⅱb may ...

用1，2-二乙烷与二十余种醛类作用，得到有固定熔点的晶体衍生物，它们的熔点分布在85—210℃之间，产率为40—96％，这试剂与甲基酮类在相同条件下无反应，因此，它可作为鉴定醛类的专属试剂。 2。上述衍生物用稀盐酸在室溫处理，能发生水解，可以定量地收回原来的醛，因此这试剂又可作为分离醛类的试剂。 3。上述衍生物可以用非水滴定法半微量地测定其分子量可作为鉴定醛类的另一项参考数据。 4.1，2-二乙烷与醛类能生成晶体衍生物，但这试剂也与甲基酮在同样条件下发生反应，所以不适合作为鉴定醛类的专属试剂。

Hydrochloric acid and thiosulphate solution react to give sulphur particles which can block the transmission of light. Under this merit, light sensor can be used to collect the corresponding experimental data. Analysing these data can help to find out the relationship between the concentration of solution and the rate of reaction.

由於氢氯酸与硫代硫酸盐溶液反应所释出的硫磺会影响光线进行，因此利用光度感应器便可收集有关的实验数据，透过这些数据的分析便可找出溶液浓度与这个反应速度的关系。

Pentanediol reacted with phosphorus tribromide to make it mono-bromination, under the catalytic action of PPTs it reacted with 2,3-dihydropyran to protect another hydroxy group, then to react with triphosphine, produced quarterphossal.

再以1，5-戊二醇为原料，三溴化磷使之单溴代，得到5-溴-1-戊醇，在对甲苯磺酸吡啶盐的催化下与2，3-二氢吡喃反应保护其另一端的羟基，与三苯基膦反应生成季磷盐。

The phosphorus oxychloride or phosphorus tribromide N, N-dimethylformamide mix and react to form the Vilsmeier reagent used in the reaction. The newly prepared Vilsmeier reagent is added into the reaction bottle provided with the return condenser and the blender; a reaction raw material N, N-dimethylformamide solution expressed in the reaction formula is added into the system; the temperature is risen; the corresponding multi substituting pyridine-2 (1 H)-ketone compound can be made after the column chromatography of the silica gel; the production rate is between 60 and 95 percent according to different reactions.

由三氯氧磷或三溴化磷N，N-二甲基甲酰胺混合获得反应中所用Vilsmeier试剂；将新配制的Vilsmeier试剂加入装有回流冷凝管、搅拌器的反应瓶中，向体系中加入反应通式中表示的一种反应原料的N，N-二甲基甲酰胺溶液，升温，经硅胶柱层析分离得相应的多取代吡啶-2(1H)-酮类化合物，产率视不同反应在60~95％之间。

Any chlorine residues in the water may react with organic compounds to form harmful by-products such as trichloromethane that are difficult to remove and are known to be cancerous.

再者，水中的有机物质与氯产生化学反应后会形成有害化合物，如三卤甲烷，这些难以清除的化合物更被确定为致癌物质。

Triphenylmethyl chloride can react selectively with the 30-hydroxil group of glycyrrhetol under the catalyzing effects of three ethyl amine and dimethyl amino-pyridine.This condition of the reaction has an important value for the selective protection of 30-hydroxil group of glycyrrhetol.

三苯氯甲烷在三乙胺和二甲氨基吡啶等碱性催化下与甘草萜醇的C30-位羟基进行选择性缩合反应，此反应产率较与C3-位羟基化反应的要高，此种反应条件在甘草萜醇C30-位羟基的选择性保护中具有重要的价值。

Sensors react to all unbalancing forces and the mechanisms instantly make the adjustments necessary to keep the car erect and steady.

传感器的反应，所有的不平衡势力和机制，即时作出必要的调整，以保持汽车竖立和稳定。

However, every game is a different story, and that against the Sicilians definitely showed an unbrilliant Milan, unable to react to the lift of a brave and courageous Messina.

然而，每一场比赛都是另一个故事，与西西里人对抗的米兰显然不够杰出，保持着上升势头的梅西纳勇敢而充满斗志，米兰对此准备不足。

Numpad +: Confusion- When activated, the enemy is completely confused and will not react to your presence at all, even if you are uncloaked!

小键盘+：困惑，当被激活时，敌人是完全混淆，并会没有反应，在所有您的光临，即使你是uncloaked！

Theyunderstand how they are hardwired, and know what to expect fromthemselves — which, in turn, allows them to react calmly underpressure, because they can visualize their response.

他们懂得自己的特性，并且知道自己的预期--这样反过来能让他们在压力下冷静的应对，因为他们能够&视觉化&自己的回应。

For the head-teacher of the class said that I had seriously broken the school rules,which led me to a three-day suspend class.

为什么呢？因为我的班主任说我严重的违反了校规，于是让我停课三天。

Many of them believe that the conversion of thousands of working-class folk in England spared that nation from the mass carnage and the tyranny that came with the revolution in France.

他们之中有许多人相信，在英国数以千计的劳工阶级之悔改信主使英国免於遭受如法国大革命所造成的大屠杀和专制暴政。