中间体

It was showed that trapping reactions in singlet oxygenation of 1 occured mainly on the stage of zwitterionic intermediate (2), whereas was not a major precursor to trapping prod-ucts.

结果显示，在1的单重态氧反应中，捕捉反应主要发生于两性离子(2)阶段，而4并非导致捕捉产物的重要中间体。

These two reactions that give different four-memabered heterocyclic products; both proceed;via a two-step mechanism involving a zwitterionic intermediate.

结果表明，这两个生成不同四元杂环产物的平行反应均为有一两性离子中间体的分步反应。

The analysis method of Octyltin Mercaptide and its intermediate have been studied,and the best experiment conditions were found.

对工业产品二甲基二巯基乙酸异辛酯锡及其中间体二氯二甲基锡的质量分析方法进行了研究，找出了最佳实验条件。

Radicals, hydrogen peroxid e and singlet oxygen are known to oxidize biological macromolecules, with

O2 -。1O2 是一种反应活性相当高的亲电瞬态中间体，能高效地氧化生物大分子，造成生物体的

A high performance liquid chromatographic method was studied for the simultaneous determination of pesticide imidacloprid and its two intermediates (2-chloro-5-methyl pyridine and 2-chloro-5-chloromethyl pyridin).

研究了用高效液相色谱法同时分离测定农药吡虫啉原粉和中间体2-氯-5-甲基吡啶及2-氯-5-氯甲基吡啶含量的方法。

Objective To modify the synthesis of Benzhydryl 2α- methyl - 2β- [ ( 1,2,3 -triazol - 1 - yl)- methyl ] penicillanate - 1,1 - dioxide, the key intermediate of β- lactamase in-hibitor tazobactam.

目的 改进β-内酰胺酶抑制剂泰唑巴坦关键中间体2α-甲基-2β[(1，2，3-三唑-1-基)-甲基]青霉烷酸砜二苯甲酯的合成。

Respectively, glutamic acid derivatized β-CD has been synthesized with epoxy chloropropane as the intermediate, a water-insoluble yellow liquid was got after the acetylating of the by using acetic anhydride, which was used as a novel gas chromatographic CSP; A water-soluble β-CD polymer cross-linked with epoxy chloropropane has been synthesized, and the derivatives of β-CD polymer were synthesized by its alkylating and acetylating. The different β-CD derivatives were coated on silica capillary columns by dynamic method, the chromatographic properties and retention behaviors of the fused silica capillary columns were studied, the results showed that the β-CD derivatives had good stereoselectivity and separation results to some compounds, especially to various positional isomers and enantiomers.

本文还分别以环氧氯丙烷为中间体，合成了七{2，6-二-O-[3-(1，3-二羟基丙氨酸)]}-β-环糊精，再用醋酸酐将其乙酰化，得到了一种淡黄色粘稠液体，合成了一种新型的环糊精衍生物；以环氧氯丙烷作交联剂合成了一种水溶性的β-环糊精聚合物，再将其烷基化和酰基化，合成了β-环糊精聚合物的不同衍生物，用动态法将不同类型的β-环糊精衍生物涂渍在石英毛细管柱上，通过对所制备柱柱性能的测试和对一系列化合物的分离和保留行为的研究，结果表明所合成的β-环糊精衍生物对各类化合物，特别是对位置异构体和对映异构体具有较好的分离效果，显示了很强的立体选择性。

In the process, 2, 4-difluoroaniline is used to carry out ammoniated reaction. Then through a series of similar reactions, the important intermediate of temafloxacin, which is called 7-chloro-6-fluoro-1-(2, 4-difluorophenyl)-1, 4-dihydro-4-oxo-3-quinoline acid, is gained.

与环丙沙星和二氟沙星类似，用2，4-二氟苯胺进行胺化反应，再进行一系列类似的反应，制得合成替马沙星的关键中间体7-氯-6-氟-1-（2，4-二氟苯基）-1，4-二氢-4-氧代喹啉-3-羧酸。

Firstly, cotton cellulose was basified and aged to alkali cellulose, then samples reacted with 3-Chloro-2-Hydroxypropylurea to produce 3-Creido-2-Hydroxypropyl cellulose.

将棉纤维进行碱化、老化处理，所得到的碱纤维再与中间体3-氯－2-羟丙基脲反应制得3-脲基－2-羟基丙基纤维素。

Companies to take advantage of the local rich brine resources, focus on the development of brominated flame retardants and pharmaceutical intermediates, such as deep-processing industry bromine.

公司充分利用当地丰富的卤水资源优势，重点发展溴系阻燃剂和医药中间体等溴素深加工产业。

However, as the name（read－only memory）implies, CD disks cannot be written onorchanged in any way.

然而，正如其名字所指出的那样，CD盘不能写，也不能用任何方式改变其内容。

Galvanizes steel pallet is mainly export which suits standard packing of European Union, the North America. galvanizes steel pallet is suitable to heavy rack. Pallet surface can design plate type, corrugated and the gap form, satisfies the different requirements.

镀锌钢托盘多用于出口，替代木托盘，免薰蒸，符合欧盟、北美各国对出口货物包装材料的法令要求；喷涂钢托盘适用于重载上货架之用，托盘表面根据需要制作成平板状、波纹状及间隔形式，满足不同的使用要求。