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Starting with the readily available isatin, two designated key cyclization precurors 25 and 26 were synthesized respectively by 5 steps and 6 steps reactions ,with Wittig reaction and Corey-Chaykorsky reaction as key steps.

以商品可得的吲哚醌为起始原料，分别经过5步和6步以Wittig烯烃化，Corey-Chaykorsky反应为关键步骤的合成路线，得到2个用于的环合反应的前体亚胺25和26。

The current situation of utilizing isobutane and isobutylene in China were introduced, the reaction mechanism, reaction process and types of catalyst for preparing isobutylene via dehydrogenation of isobutane were narrated emphatically.

介绍我国异丁烷和异丁烯资源的利用现状，重点对异丁烷脱氢制备异丁烯的反应机理、反应流程和催化剂类型进行了论述。

Kinetics of isobutylene hydration reaction catalyzed by fine powder of NKC-9 ion exchange resin,and effects of catalyst concentration,temperature,pressure,stirring rate and isobutylene concentration on reaction were studied in a semibatch reactor.

采用半连续反应过程，使用NKC -9离子交换树脂细粉，改变催化剂浓度、反应温度、反应压力、搅拌转速和异丁烯浓度等条件，对异丁烯水合反应动力学进行了实验研究。

This paper studied competing reaction parameters of isocyanate with alcohol and water at room temperature based on its independent reaction.

摘 要：本文基于异氰酸酯分别与醇和水的独立反应，研究求解了异氰酸酯在室温下与醇和水的竞争反应参数。

The addition reaction of diazo pyrazoles and isocyanate has been investigated and the mechanism of this reaction has been guessed.

研究了重氮基吡唑同异氰酸酯的环加成反应，初步推测了该反应的机理。利用此反应设计了一类可能具有生物活性的吡唑骈[5，1-d][1，2，3，5]四嗪-4-酮类衍生物。

The effect of the addition of the crystal seed in the jarosite preciptation was investigated and the results showed that the crystal seed would accelerate the crystallizing rate of jarosite formation, which convert the reaction mechanism from the crystallization kinetic rate control into the chemical reaction kinetic control.

阐述了晶种加入对沉矾影响的过程机理，认为晶种的加入加快了沉矾反应的结晶速度，使反应由结晶的动力学控制过渡到化学反应动力学控制，足量晶种加入情形下沉矾过程的活化能为94.66KJ／mol，表明了氯化物体系铁矾沉淀较硫酸盐体系中更易进行。

In the prebleaching of kenaf bast and pine pulps, the reaction conditions for the hemicellulase pretreatment are optimized as follows: temperature 50℃, pH 5. 0 and reaction time 2hr, as well as 0.2% of enzyme charge.

实验确定了半纤维素酶预处理的优化条件：pH=5.0，温度50℃，酶处理时间2hr和酶用量0.2%。

From what I understand, they didn't want to sound uncertain on draft night, since that's a typical Clippers reaction. This is a very important time for them in terms of season ticket renewals, which is why they had that kneejerk reaction.

眼下的一段时间对于他们下赛季能否重振门票销售情况至关重要，这也是他们在得到状元签后立即做出反应的原因之一。

It should be noted that the reaction with alkylimines failed to give the,β-lactam under current standard reaction conditions.

值得注意的是，在相同条件下，烷基亚胺参与的该反应都没能得到相应的β-内酰胺。

The orthogonal design method is adopted, by changing catalyst category, catalyst quantity, reaction time, reaction temperature, to select the optimum conditions for lactide synthesis.

实验采用正交设计方法，通过改变催化剂种类、催化剂用量、脱水时间、环化时间四个主要影响因素进行实验，根据实验结果选择最好的丙交酯制备的实验方案。

For a big chunk of credit-card losses; the number of filings (and thus charge-off rates) would be rising again, whether

年美国个人破产法的一个改动使得破产登记急速下降，而后引起了信用卡大规模的亏损。

Eph. 4:23 And that you be renewed in the spirit of your mind

弗四23 而在你们心思的灵里得以更新