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相关概念视频

Cycloaddition Reactions: MO Requirements for Thermal Activation01:16

Cycloaddition Reactions: MO Requirements for Thermal Activation

3.5K
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.
3.5K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.5K
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.
2.5K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.0K
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.
2.0K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

10.1K
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.
10.1K
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

2.1K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.1K
Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

8.2K
Pericyclic reactions are organic reactions that occur via a concerted mechanism without generating any intermediates. The reactions proceed through the movement of electrons in a closed loop to form a cyclic transition state, where rearrangement of the σ and π bonds yields specific products.
Pericyclic reactions can be classified into three categories: electrocyclic reactions, cycloaddition reactions, and sigmatropic rearrangements. Electrocyclic reactions and sigmatropic...
8.2K

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相关实验视频

Updated: Jun 13, 2025

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
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Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

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通过超分子组装在固态中同时进行循环添加.

Navkiran Juneja1, Gary C George2, Kristin M Hutchins2,3

  • 1Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas, 79409, United States.

Angewandte Chemie (International ed. in English)
|September 10, 2024
PubMed
概括
此摘要是机器生成的。

研究人员在一个单晶中实现了同时的直角循环加法反应. 这种超分子设计提供了对化学转换的高度控制,与溶液状态反应不同.

关键词:
晶体工程 晶体工程这是循环逆转.自动组装自动组装固态循环添加的固态循环添加.超分子化学 超分子化学

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科学领域:

  • 固态化学 固态化学
  • 超分子化学 超分子化学
  • 有机合成 有机合成

背景情况:

  • 结晶状态反应提供了对产品立体化学和区域化学的高度控制,这是由于分子自我组装.
  • 然而,固态反应比溶液反应少,因为分子运动和反应能力有限.
  • 通常,在晶相转换中只发生一种反应类型,通常需要牺牲模板分子.

研究的目的:

  • 展示第一个能够在单一晶体固体中同时经历两个不同的正交环加法反应的系统.
  • 在没有牺牲模板的情况下,通过超分子自我组装来实现受控的正交反应性.
  • 探索对超分子太阳能热能储存的双反应晶体系统的应用.

主要方法:

  • 两个分子的设计具有不同的反应性部分,在晶体状态下自组装.
  • 使用紫外线启动同时 [2+2] 和 [4+4] 循环加法反应.
  • 将结晶状态反应结果与同时发生的溶液状态反应进行比较.

主要成果:

  • 在单一晶体内实现高产的同时,区域特定和立体特定 [2+2] 和 [4+4] 循环添加.
  • 通过经过良好的控制的超分子自我组装而没有牺牲模板,证明了直角反应性.
  • 溶液状态反应产生了低产量的异构体混合物,突出显示了结晶状态控制的优势.

结论:

  • 建立了一个基本的化学方法,在晶体状态下实现直角反应性.
  • 突出了通过固体中的超分子设计实现复杂和可逆化学转换的潜力.
  • 展示了双反应晶体系统在太阳能热能存储等先进应用中的实用性.