Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

12.1K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
12.1K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.3K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
3.3K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

2.2K
Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
2.2K
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

4.6K
The Diels–Alder reaction is one of the robust methods for synthesizing unsaturated six-membered rings. The reaction involves a concerted cyclic movement of six π electrons: four π electrons from the diene and two π electrons from the dienophile.
4.6K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

5.3K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
5.3K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

4.1K
Thermal cycloadditions are reactions where the source of activation energy needed to initiate the reaction is provided in the form of heat. A typical example of a thermally-allowed cycloaddition is the Diels–Alder reaction, which is a [4 + 2] cycloaddition. In contrast, a [2 + 2] cycloaddition is thermally forbidden.
4.1K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Achieving (quasi)-monocoordination in metal complexes with an exceptionally bulky carbene ligand.

Chemical science·2026
Same author

Taming of Low-Valent Arsenic Compounds and Transfer of Nascent As<sub>2</sub> Facilitated by a Frustrated Lewis Pair.

Angewandte Chemie (International ed. in English)·2025
Same author

Ga/P-Based Ambiphilic Chelates and Their Reactivities with Main Group Elements.

Inorganic chemistry·2025
Same author

Interplay between Through-Space and Through-Bond Electronic Coupling in Singlet Fission.

Journal of the American Chemical Society·2025
Same author

Elementary Steps in Olefin Metathesis: Nickelacyclobutanes via Cycloaddition to Nickel Carbenes.

Journal of the American Chemical Society·2025
Same author

Excited State Dynamics of Odd [<i>n</i>]Cumulenes: Chain Length and Conformational Effects.

Journal of the American Chemical Society·2025

相关实验视频

Updated: Jan 9, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
09:45

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

10.8K

烯覆盖碳:循环添加,共聚和催化的途径

Mamak Bakhtiari1, Ludwig Zapf1, Tanja Kunz1

  • 1Department of Chemistry, University of Alberta, 11227 Saskatchewan Dr., Edmonton, Alberta T6G 2G2, Canada.

Journal of the American Chemical Society
|December 10, 2025
PubMed
概括
此摘要是机器生成的。

一种新的二烯覆盖碳化合物 (DECC) 被合成并功能化. 它的素复合物使循环添加反应成为一种天然类型的共聚物,作为黄金激活的化预催化剂.

更多相关视频

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
12:19

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

Published on: November 29, 2018

8.9K
Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
09:35

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

12.0K

相关实验视频

Last Updated: Jan 9, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
09:45

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

10.8K
Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
12:19

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

Published on: November 29, 2018

8.9K
Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
09:35

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

12.0K

科学领域:

  • 有机金属化学
  • 催化剂
  • 聚合物科学

背景情况:

  • 在有机金属化学中,N- heterocyclic carbenes (NHCs) 是一种多用途的配体.
  • 开发具有独特电子特性的新型碳结构对于促进催化是至关重要的.
  • 碳捐赠位点的功能化可以导致新的反应性中间体.

研究的目的:

  • 合成和表征一种新的二烯覆盖碳素 (DECC).
  • 研究DECC及其功能化衍生物的电子特性和反应性.
  • 探索由此产生的复合物和聚合物的催化应用.

主要方法:

  • 通过NHC前体的氧化/双解质化合成DECC.
  • 用和胺连接体对DECC进行功能化.
  • 使用光谱技术对DECC,胺复合物和由此产生的共聚物进行表征.
  • 研究循环添加反应和离子共聚变.
  • 评估共聚物作为化的前催化剂.

主要成果:

  • 成功合成了前所未有的二烯封顶碳素 (DECC),IPr.
  • 在功能化 DECC 衍生品中证明特殊的 π 接受性.
  • 素复合物经历了二烯局部化 [4 + 2] 循环添加与循环octyne.
  • 素复合物的离子共聚化与异烯产生了天然类型的共聚物.
  • 由此产生的共聚物,在黄金协调后,表现为化前催化剂的活性.

结论:

  • 开发的DECC支架为获取新型反应性中间体提供了一个独特的平台.
  • 来自DECC的胺复合物具有多功能反应,包括循环添加和聚合.
  • 由此产生的天然类型的共聚物表现为可回收和活跃的黄金催化水化前催化剂.