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In addition, we studied the ring-closing metathesis of the diene intermediates to access helicenes by screening a wild reaction condition.

我们还对RCM反应关环得到螺旋化合物的方法进行了研究，筛选得到温和的RCM反应条件。

We also develop intermediates such as 2,4-Dinitrobenzyl Chloride and Diphenyl Ether.

同时也自主生产 2，4-二硝基氯化苯、二苯醚等中间体。

This method can be used not only in the preparation of ACEI medicine intermediates, but also as a kind of simple and important method in increasing dissymmetry carbon atom quantity and extending carbon chain.

本方法不但可以应用于ACEI类药物中间体的制备，而且是一种简单有效的增加不对称碳原子数量、延长碳链的重要方法。

Therefore, I came back in to fit intermediates and immediately after that, the downpour arrived.

因此，我立刻回去换胎，接着下起了倾盆大雨。

The potential intermediates of a series of electrophilic agents reacting with ethene have been computed with PM3 semiempirical method.

采用PM3方法计算了不同亲电试剂与乙烯生成的中间体正离子的势能曲线。

Seven such esters' intermediates were synthesized facilely from GCLE via Williamson Reaction in the presence of sodium bromide.

b、C-3位含硫甲基的头孢菌素衍生物：依威廉森合成法合成了7个C-3位含硫甲基的头孢菌素酯型衍生物。

In addition, FAMEs along with the byproduct glycerol are also used as intermediates to manufacture chemicals.

脂肪酸甲酯是一种优质清洁燃料，即生物柴油；同时，脂肪酸甲酯及其联产的甘油进一步精制和深加工可以生产许多化工产品。

The structure of the finial products and most of the key intermediates were confirmed by NMR, MS, or HRMS.

所有目的化合物和大部分中间化合物的结构都经NMR，MS，或HRMS分析确证。

Investigation on the intermediates shows that the shape of products changes from curled nanoflakes to flower-like patterns then dense flower-like patterns with the increase of complex concentration and reaction time.

对中间产物的研究结果表明，随着配合物浓度的增加、反应时间的延长，产物形貌从卷曲的片状转变成纳米片组成的花状且花状结构逐渐增密。

Based on functional group transformation and C-C bond formation,this review focuses on the first-rate progress of the catalytic asymmetric reaction in China in recent years,especially its application in synthesis of chiral drugs and pharmaceutical intermediates.

本文从官能团的转换和碳硫键形成的角度概述了我国近年来在不对称催化反应领域的研究进展，特别是在手性药物及其中间体合成中的应用进展。

Molecular Distillation is a kind of high vacuum distillation method, which is suitable for the separation of high boiling, heat sensitivity and viscidity products.

分子蒸馏技术是一种在高真空条件下进行的连续蒸馏过程，适合于分离高沸点、热敏性及具有生物活性的混合物。

They are to the Noughties what yuppies were to the Eighties .

那在六十年代是时髦的，但在八十年代肯定是过时了