查询词典 dipolar

In addition, we found that 4-phenyl-l,2,4-triazolinium N-ylides reacted withvarious electron-deficient olefins to afford pyrrole derivatives in good yields via 1,3-dipolar cycloaddition oxidative ring fission, In some cases, tetrahydropyrrolo[1,2-b]triazole and pyrrolo[1,2-b]triazole, which are stable and are not aromatized orcleaved in the reaction conditions, could be isolated, This is a facile and novel route forthe synthesis of pyrrole derivatives.

此外，本文研究了五员三氮杂环化合物4-苯基1，2，4-三氮唑的N-叶立德，发现在氧化剂存在下与缺电子烯烃发生1，3-偶极环加成反应生成的吡咯并[1，2-b]三氮唑，在大多数情况下开环生成吡咯衍生物，反应条件温和，收率良好，是合成吡咯衍生物的一个新的途径。

The demagnetizing effect of dipolar interaction is shown to produce deviations from simple super paramagnetic behavior predicted by the Langevin model.

由偶极相互作用的退磁效应显示出与简单超顺磁行为的偏差。

But the maximal shift range of the absorption-edge preponderated over 500 nm, and leaded that the dipolar plasma resonance absorption peak were covered up and gradually disappeared in the absorption spectrum. We theoretically explained the mechanism of the modulating action.

理论分析表明，吸收峰位的移动主要源于偶极共振，而峰形的宽化主要由纳米粒子的表面效应和量子尺寸效应引起。

It was found that the homogeneous orientation tendency of azobenzene was a common phenomenon in the self-assembled films fabricated by electrostatic layer-by-layer dipping process of the side-chain azo polyelectrolytes and poly(diallyldimethyl ammonium chloride); substituents that link to azobenzene have influences on the orientation of azobenzene in self-assembled films,which could be attributed to charge interaction and dipolar interaction between the chromophores and the polycation substrates.

研究表明，侧链型偶氮聚电解质自组装膜中偶氮生色团普遍存在一定程度的沿面取向。偶氮生色团所带端基的类型对其在自组装膜中的取向程度有较大的影响，这主要取决于偶氮生色团与聚阳离子基底的电荷相互作用和极性相互作用等。

It was found that the homogeneous oriention tendency of azobenzene was a common phenomenon in the self-assembled films fabriemed by electrostatic layer-by-layer dipping process of the side-chain azo polyeleetrolytes and poly (diallyldimethyl armnonium chloride):suhstituents that link to azobenzene have influences on the orientmion of azobenzene in self-assembled films,which could be attributed to charge interaction and dipolar interaction between the ehromophores and the polycation substrates.

研究表明，侧链型偶氮聚电解质自组装膜中偶氮生色团普遍存在一定程度的沿面取向。偶氮生色团所带端基的类型对其在自组装膜中的取向程度有较大的影响，这主要取决于偶氮生色团与聚阳离子基底的电荷相互作用和极性相互作用等。

The 1,3-dipolar cycloaddition of nitrones with alkenes is one of the most studied reactions, among all the cycloadditions.

硝酮与烯烃的反应是环加成反应中研究最多的一种反应。

We are interesting in the synthesis and the application of 1,2,3-triazoles inthis paper, which including the following:In the first chapter, we reviewed mainly the development of Huisgen\'s 1,3-dipolar[3+2]-cycloaddition from organoazides and alkynes or alkenes to synthize1,2,3-triazoles in recent years.

本论文针对1，2，3-三唑的合成和应用，主要包括以下方面：第一章对近几年来1，2，3-三唑合成研究进行了概述，总结了有机叠氮和炔烃、烯烃的1，3-偶极环加成反应以及其他方法合成三唑的进展。

To optimize the reaction condition for the purpose of target compounds synthesis, the advance of 1,3-dipolar cycloaddition and click chemistry is reviewed. The conditions of the reaction between azides or nitrile oxides and terminal alkynes were optimized experimentally and the best operation condition was established.

论文综述了偶极环加成反应和点击化学的进展，特别对Cu催化的腈氧化物或叠氮化物与端炔化合物之间的1，3-偶极环加成反应进行了理论分析与实验研究对反应条件进行了优化，确立了实验室中进行反应的最佳操作条件。

To optimize the reaction condition for the purpose of target compounds synthesis, the advance of 1,3-dipolar cycloaddition and click chemistry is reviewed. The conditions of the reaction between azides or nitrile oxides and terminal alkynes were optimized experimentally and the best operation condition was established.

以此为核心，以价廉易得的小分子原料通过数步反应，分别合成了异噁唑、三氮唑杂环取代(来源：29ABceC论文网www.abclunwen.com)的甲烷衍生物和三嗪联三氮唑杂环衍生物这两个比较有意义的小分子化合物库，达到了分子的多样化。

The copper-catalyzed 1,3-dipolar cycloaddition of alkynes with azides is a typical example of "click" reaction.1 Since the reaction enjoys the advantages of high efficiency and regioselectivity and requires mild reaction conditions and simple purification procedures, it has become a versatile synthetic tool with applicability in diverse areas including bioconjugation and surface modification.2 The click reaction has also been utilized in polymer science with emphasis on the functionalization of preformed polymers through postpolymerization approaches.3 The effort of developing the reaction into a new polymerization technique, however, has met with only limited success.

登录后回答可以获得经验值奖励，并可以查看和管理所有的回答。登录|铜催化1，3偶极环加成反应的炔烃与叠氮化物是&点击&自reaction.1典型的例子反应享有高效率的优势和区域选择性并要求反应条件温和，简单净化程序，它已成为一个多功能综合工具在包括生物耦合和不同领域的适用性表面modification.2的点击反应亦是利用聚合物科学与功能化的重点通过postpolymerization approaches.3预制聚合物发展到一个新的聚合反应的努力技术，然而，只取得有限的成功。

I didn't watch TV last night, because it .

昨晚我没有看电视，因为电视机坏了。

Since this year, in a lot of villages of Beijing, TV of elevator liquid crystal was removed.

今年以来，在北京的很多小区里，电梯液晶电视被撤了下来。