查询词典 acetophenone

The reduction of acetophenone was studied by cyclic voltammetry and the mechanism has been proposed on the basis of the results.

并利用循环伏安法研究了苯乙酮的还原和电羧化过程的机理。

The method for determination of acetophenone and cinnamic acid in bioconversion broth was established.

建立RP-HPLC法测定生物转化液中苯乙酮和肉桂酸的含量。

Under appropriate conditions, the conversion of acetophenone could be as high as 100% and the enantiomeric excess of-1-phenylethanol exceeded 99.0%.

在合适的条件下底物苯乙酮的转化率高达100%，产物-1-苯基乙醇的对映体过量值大于99.0%。

Average recovery of acetophenone and cinnamic acid achieves 100.42% and 101.75%, respectively, with standard deviation of 1.3% and 1.7%, respectively.

苯乙酮和肉桂酸的平均回收率分别为100.42%和101.75%，相对标准偏差分别为1.3%和1.7%。

A typical example is the oxidation of ethylbenzene to prepare acetophenone.

其中最有代表性的是乙苯氧化制苯乙酮。

Most of the vibrational modes and frequency of p-halogenated acetophenone are similar.

3对-卤代苯乙酮大部分振动模的描述以及拉曼位移量相似。

Conversion and 79.1% ee were obtained for acetophenone under optimized conditions.

实验结果表明，离子液体介质中的纳米钌催化剂体系具有良好的催化活性和对映选择性。

In our research on study chemical reaction of active methylene compounds and brom-acetophenone. Because of brom-acetophenone is compound that contain carbonyl and halogen ,which will take place electrophilic substitution and nucleophilic addition. When active methylene compounds are ethyl acetoacetate and β-diketone, controlling reaction condition, we have found that mono-substitution's production and di-substitution's. production is isolated; active methylene compounds are acetoacetanilide and acetoacetanilide derivate, pyrrolidin-2-one derivants were obtained by substitution and close-ring reaction .but there is no report about it.

本文是让活泼亚甲基类化合物与溴代苯乙酮发生化学反应，由于溴代苯乙酮是含有羰基的卤代烃结构，它可以发生亲电取代和亲核加成反应，当活泼亚甲基类化合物为乙酰乙酸乙酯和β-二酮时，控制反应条件可以发生单取代和双取代两种产物；当活泼亚甲基类化合物为乙酰乙酰芳胺类化合物来反应时，溴代苯乙酮中的羰基与氨基会发生分子内的关环反应生成吡咯烷-2-酮衍生物，这在以前的研究中是没有发现的。

The UV absorption of α hydroxy α,α dimethyl acetophenone,α hydroxy α,α dimethyl acetophenone and α,α dimethoxy α phenyl acetophenone in different media was investigated.

利用紫外吸收光谱对不同环境中的光引发剂进行考察，但由于其吸收光谱没有明显的变化，因而未能获得较确切的结论［1，2］。

Huapai products:pchlorophenol,ochlorophenol,2,4dichlorophenol,2,6dichlorophenol,2,4,5trichlorophenol,2,4,6trichlorophenol,4chloro2benzyl phenol,pbromophenol,2,4,6tribromophenol,1chloro4(1,1dimethyl ethyl) benzene ether,3bromoanisole,mbromofluorobenzene,2tetra hydrofuran,αbromo4chloro acetophenone,αbromo4methoxy acetophenone,4chloro benzophenone,4chloro2methylaniline,n(2hydroxyethyl)ethane diamine; n(2aminoethyl)ethanolamine,2,3dibromopropionyl chloride,4bromo benzene sulphonyl chloride,terephthaloyl chloride,isophthaloyl chloride,nchlorosuccinimide,nbromosuccinimide,pchloranil;tetrachloro1,4benzoquinone,5chloroisatin.

华派公司产品：对氯苯酚，邻氯苯酚，2，4二氯苯酚，2，6二氯苯酚，2，4，5三氯苯酚，2，4，6三氯苯酚，4氯2苄基苯酚，对溴苯酚，2，4，6三溴苯酚，对氯苯基叔丁基醚，间溴苯甲醚，间溴氟苯，α溴甲基四氢呋喃，α溴代4氯苯乙酮，α溴4甲氧基苯乙酮，4氯二苯甲酮，4氯2甲基苯胺，N(2羟乙基)乙二胺， 2，3二溴丙酰氯，对溴苯磺酰氯，对苯二甲酰氯，间苯二甲酰氯，N氯代丁二酰亚胺，N溴代丁二酰亚胺，四氯苯醌，5氯靛红。

Now, however, all children continue in "comprehensive" schools, and the eleven-plus determines which courses of study the child will follow.

然而现在，所有的孩子都要在综合学校继续学习，所以这次考试只是决定他们将要学习哪些课程。

Cultivatable land , and led to a general recognition that development must not be carried at the cost of agriculture .

城区的迅速扩大在很多情况下侵占了宝贵的可耕地，使人们普遍认识到发展不能以牺牲农业为代价。