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相关概念视频

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview01:27

Vicinal Diols via Reductive Coupling of Aldehydes or Ketones: Pinacol Coupling Overview

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Wilhelm Rudolph Fittig discovered the pinacol coupling reaction in 1859. It is a radical dimerization reaction and involves the reductive coupling of aldehydes or ketones in the presence of hydrocarbon solvent to yield vicinal diols.
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α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview01:19

α-Hydroxy Ketones via Reductive Coupling of Esters: Acyloin Condensation Overview

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The pinacol and McMurry reactions involve the reductive coupling of ketones or aldehydes. Similarly, the bimolecular reductive coupling of two ester molecules in the presence of sodium metal in an aprotic solvent yields an α-hydroxy ketone product. The α-hydroxy ketone is also called acyloin, so the reaction is referred to as ‘acyloin condensation.’
2.9K
Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction01:22

Alkenes via Reductive Coupling of Aldehydes or Ketones: McMurry Reaction

1.9K
The radical dimerization of ketones or aldehydes gives vicinal diols through a pinacol coupling reaction. However, the behavior of titanium metals used for the reaction as a source of electrons is unusual. When the reaction is carried out in the presence of titanium, diols can be isolated at low temperatures. Else titanium further reacts with diols, forming alkenes through the McMurry reaction.
1.9K
Thermal Electrocyclic Reactions: Stereochemistry01:17

Thermal Electrocyclic Reactions: Stereochemistry

2.0K
The stereochemistry of electrocyclic reactions is strongly influenced by the orbital symmetry of the polyene HOMO. Under thermal conditions, the reaction proceeds via the ground-state HOMO.
Selection Rules: Thermal Activation
Conjugated systems containing an even number of π-electron pairs undergo a conrotatory ring closure. For example, thermal electrocyclization of (2E,4E)-2,4-hexadiene, a conjugated diene containing two π-electron pairs, gives trans-3,4-dimethylcyclobutene.
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
Esters to Alcohols: Hydride Reductions01:17

Esters to Alcohols: Hydride Reductions

3.4K
Esters are reduced to primary alcohols when treated with a strong reducing agent like lithium aluminum hydride. The reaction requires two equivalents of the reducing agent and proceeds via an aldehyde intermediate.
Lithium aluminum hydride is a source of hydride ions and functions as a nucleophile. The mechanism proceeds in three steps. Firstly, the nucleophilic hydride ion attacks the carbonyl carbon of the ester to form a tetrahedral intermediate. Subsequently, the carbonyl group re-forms,...
3.4K

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Updated: Jun 10, 2025

Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
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电诱导的降解和减光合

Liam J Franov1, Tayla L Wilsdon1, Milena L Czyz1

  • 1School of Chemistry, The University of Melbourne, Parkville, Victoria 3010, Australia.

Journal of the American Chemical Society
|October 17, 2024
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的电化学方法,用于将和异与化物合起来,产生多种C(sp3) 杂交的酒精. 这种无催化剂的方法克服了合成复杂氧化支架的现有方法的局限性.

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Retropinacol/Cross-pinacol Coupling Reactions - A Catalytic Access to 1,2-Unsymmetrical Diols
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A Two-Step Protocol for Umpolung Functionalization of Ketones Via Enolonium Species
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Facile Preparation of 2Z,4E-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate

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Retropinacol/Cross-pinacol Coupling Reactions - A Catalytic Access to 1,2-Unsymmetrical Diols
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科学领域:

  • 有机化学
  • 电化学
  • 合成方法

背景情况:

  • 由于基质耐受性和功能组兼容性的局限性,直接合和化物具有挑战性.
  • 现有的C-C π键与化物合的方法通常在复杂的分子环境中受到限制.

研究的目的:

  • 开发一种高效和多用途的方法来直接合简单的基,异基和未激活的基.
  • 能够从易于获得的原料中合成多种C ((sp3) 混合的酒精.

主要方法:

  • 通过快速交替极性 (rAP) 电解利用电化学诱导的C-C π键的还原激活.
  • 在减速合过程中使用无催化剂的条件.
  • 研究了基离子中间体的生成和反应性.

主要成果:

  • 实现了和异与酸性的直接合,产生多种C(sp3) 杂交的酒精.
  • 通过rAP电解证明了基离子中间体的化学选择性生成.
  • 报告了异环化合物的前所未有的降解性和芳香性功能化.

结论:

  • 开发的rAP电解协议提供了一种多功能和高效的C(sp3) 富含氧化的支架.
  • 这种无催化剂的方法扩大了有机合成的还原性合反应的范围.
  • 提供从简单原料中直接获得结构多样化的酒精产品.