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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

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.
Diels–Alder Reaction Forming Cyclic Products: Stereochemistry01:28

Diels–Alder Reaction Forming Cyclic Products: Stereochemistry

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.
Diels–Alder Reaction: Characteristics of Dienes01:29

Diels–Alder Reaction: Characteristics of Dienes

The Diels–Alder reaction brings together a diene and a dienophile to form a six-membered ring. Both components have unique characteristics that influence the rate of the reaction.
Characteristics of the diene
Conformation
The simplest example of a diene is 1,3-butadiene, an acyclic conjugated π system. At room temperature, the molecule exists as a mixture of s-cis and s-trans conformers by virtue of rotation around the carbon–carbon single bond. Although the s-trans isomer is more stable, the...
Diels–Alder Reaction: Characteristics of Dienophiles01:24

Diels–Alder Reaction: Characteristics of Dienophiles

In a Diels–Alder reaction, the diene is usually an electron-rich system and acts as a nucleophile, whereas the dienophile is electron-deficient and functions as an electrophile. Much like the diene, the nature of the dienophile significantly impacts the outcome of the reaction.
Characteristics of Dienophiles
Generally, the best dienophiles are alkenes containing electron-withdrawing substituents such as carbonyl, nitrile, and nitro groups. The feasibility of a Diels–Alder reaction depends on...
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors01:31

Diels–Alder vs Retro-Diels–Alder Reaction: Thermodynamic Factors

The Diels–Alder reaction is thermally reversible, meaning that the reaction reverts to the starting diene and dienophile under suitable temperatures. The forward reaction gives a cyclohexene derivative and is favored at low to medium temperatures. The reverse process, also called retro-Diels–Alder reaction, is a ring-opening process favored at high temperatures.

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Application of Elemental Lanthanides in the Selective C-F Activation of Trifluoromethylated Benzofulvenes Providing Access to Various Difluoroalkenes
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在最不寻常的 furan Diels-Alder 反应中,结构和反应性的相互作用.

Gerry A Griffith1, Ian H Hillier, Andrew C Moralee

  • 1Department of Chemistry, University of Leicester, University Road, Leicester LE1 7RH, UK.

Journal of the American Chemical Society
|October 5, 2006
PubMed
概括

分化酸酸与酸发生快速循环添加反应,与它们的非化对应物不同. 密度函数理论 (DFT) 的计算揭示了由 (IV) 催化剂和溶剂稳定的极过渡状态,准确地预测了反应结果.

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科学领域:

  • 有机化学 有机化学
  • 计算化学的计算化学
  • 催化剂是一种催化剂.

背景情况:

  • 化基酸盐是具有独特反应性的新型试剂.
  • 了解循环添加反应的机制对于合成化学至关重要.
  • 易斯酸催化在有机转化中起着重要作用.

研究的目的:

  • 为了研究乙3,3-二-2-(N,N-二甲基碳胺基) -2-酸盐与 furan 的反应性.
  • 使用密度函数理论 (DFT) 计算来阐明反应机制.
  • 为了比较二化和非化酸盐的活性.

主要方法:

  • 实验的迪尔斯-阿尔德反应与各种 furan 和一个锡 (IV) 催化剂.
  • 密度函数理论 (DFT) 计算以建模过渡状态和反应路径.
  • 对反应动力学,立体化学和产物形成的分析.

主要成果:

  • 乙3,3-二-2-(N,N-二甲基胺基) -2-烯酸盐与酸盐反应快速,产量高.
  • 非化类型在相同条件下不发生反应.
  • DFT计算准确地预测实验观测,包括速度加速和立体化学结果.
  • 提出了一种两步反应机制,涉及一个高度极性过渡状态,由SnCl(4) 和极性溶剂稳定.
  • 在现场观察并检查了一种导致循环碳酸盐形成的环开反应.

结论:

  • 原子的存在显著增强了酸盐在与酸盐的Diels-Alder反应中的反应性.
  • 易斯酸催化和极性溶剂在稳定极性过渡状态和促进反应方面发挥着至关重要的作用.
  • DFT计算是预测结果和理解这些循环加法反应机制的可靠工具.
  • 固态阻碍可以阻碍后续反应,例如循环碳酸盐的形成.