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相关概念视频

Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.8K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.8K
Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

5.0K
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.
5.0K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

3.6K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
3.6K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

13.6K
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.
13.6K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

3.7K
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.
3.7K
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

2.4K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
2.4K

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Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
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一个M(II) 4L6四面体的路径依赖后组装修改

Tanya K Ronson1, Ben S Pilgrim1, Jonathan R Nitschke1

  • 1Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, U.K.

Journal of the American Chemical Society
|August 9, 2016
PubMed
概括
此摘要是机器生成的。

使用迪尔斯-阿尔德反应对Fe ((II) 4L6四面体进行组装后的修改会产生新的结合点. 这种超分子宿主修饰允许选择性封装富勒烯和阳离子客体,证明可调节的宿主-客体化学.

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科学领域:

  • 超分子化学
  • 有机合成
  • 材料科学

背景情况:

  • 铁四面体提供了一个超分子化学平台.
  • 后组装修改 (PAM) 允许预先形成的超分子结构的功能化.
  • 迪尔斯-阿尔德循环加法是一种修改分子结构的多功能反应.

研究的目的:

  • 通过使用Diels-Alder化学来探索Fe ((II) 4L6四面体的组装后修改.
  • 调查PAM对子腔和客体结合特性的影响.
  • 通过改造的子来证明富勒伦和离子客的选择性封装.

主要方法:

  • 在子的炭板和四乙烯 (TCNE) 之间的Diels-Alder循环添加反应.
  • 将C60和TCNE连续添加到子中以形成共价添加物.
  • 使用富勒C60和阳离子客体 ([Co(C2B9H11) [2]) 的客体封装研究.

主要成果:

  • 合成了一种修改后的子 (2),具有适用于C60封装的封闭腔.
  • 原始子 (1) 与C60形成了一个独特的共价添加物,该添加物可以通过TCNE进一步修改.
  • 根据C60和TCNE的添加顺序分离出两个不同的产品.
  • 不同于原来的子, 修改后的子2成功地结合了离子客.

结论:

  • 通过迪尔斯-阿尔德反应的组合后修饰有效调整了超分子宿主的结合特性.
  • 该策略允许为特定客人封装创建量身定制的腔.
  • 这种方法表明了设计先进的主机-客户系统的巨大潜力.