查询词典 alkenes

In the first part, Co-containing zeolites and MCM-41 have been studied for the epoxidation of alkenes.

第一部分研究了位于分子筛中的Co~(2+)或高分散的single-site Co在烯烃环氧化反应中的催化性能。

This thesis includes two parts. The first part is study on hydroformylation of alkenes in ionic liquid-H2O system.

本论文分两部分：咪唑离子液体—水体系中的烯烃氢甲酰化反应研究和新型咪唑类手性季铵盐的合成。

For alkenes, vehicle related emissions and fuel evaporation are the main sources, accounting for 49% and 40%, respectively.

烯烃主要来自于交通工具尾气排放和燃料挥发，其分担率为49%和40%。

In this paper, we design a multiple-level system according to the classification of 899 alkenes from OMNIC database.

设计了一个分等级系统对OMNIC数据库中899个烯烃化合物进行分类。

The rate constants of radical and electrophilic addition to alkenes are dominated by different factors.

烯烃的自由基加成和亲电加成速率受不同的因素控制。

As an essential component of the Baylis-Hillman reaction, activated alkenes are a kind of very important building blocks in organic synthesis, and have been applied in various fields.

作为Baylis-Hillman反应的重要组成部分，烯烃特别是具有一定活性的烯烃，由于它们本身的结构特征，具有与一般烯烃不同的独特的性质，是一类非常重要的有机合成中间体。

It provides a useful vehicle for transforming unsaturated acids to their corresponding alkenes.

它为使不饱和酸变成相应的烯烃提供了一个有用的中间体。

A novel efficient procedure has been developed for the conjugate addition of amines to electron deficient alkenes.

提供了一种新型高效的催化缺电子烯与胺类的共扼加成的反应体系。

Alkenes have one or more double bonds between carbon atoms, where two pairs of electrons are shared.

链烯有一个或多个共价键，即碳原子分享两对电子。

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 have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。