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Pericyclic Reactions: Introduction01:17

Pericyclic Reactions: Introduction

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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...
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Woodward–Hoffmann Selection Rules and Microscopic Reversibility01:34

Woodward–Hoffmann Selection Rules and Microscopic Reversibility

3.2K
Electrocyclic reactions, cycloadditions, and sigmatropic rearrangements are concerted pericyclic reactions that proceed via a cyclic transition state. These reactions are stereospecific and regioselective. The stereochemistry of the products depends on the symmetry characteristics of the interacting orbitals and the reaction conditions. Accordingly, pericyclic reactions are classified as either symmetry-allowed or symmetry-forbidden. Woodward and Hoffmann presented the selection criteria for...
3.2K
Reaction Mechanisms03:06

Reaction Mechanisms

26.0K
Chemical reactions often occur in a stepwise fashion, involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs.
For instance, the decomposition of ozone appears to follow a mechanism with two steps:
26.0K
Multi-Step Reactions02:31

Multi-Step Reactions

7.4K
Chemical reactions often occur in a stepwise fashion involving two or more distinct reactions taking place in a sequence. A balanced equation indicates the reacting species and the product species, but it reveals no details about how the reaction occurs at the molecular level. The reaction mechanism (or reaction path) provides details regarding the precise, step-by-step process by which a reaction occurs. Each of the steps in a reaction mechanism is called an elementary reaction. These...
7.4K
Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.7K
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.
2.7K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.1K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.1K

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Updated: Jul 28, 2025

Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

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伪多元件反应 伪多元件反应

Julio C Flores-Reyes1, Vanesa Del C Cotlame-Salinas1, Ilich A Ibarra2

  • 1Departamento de Química, Universidad Autónoma Metropolitana-Iztapalapa Av. Ferrocarril San Rafael Atlixco 186, Col. Leyes de Reforma 1A Sección, Iztapalapa Ciudad de México C.P. 09310 Mexico egz@xanum.uam.mx aij@xanum.uam.mx.

RSC advances
|June 1, 2023
PubMed
概括

本综述探讨伪多元件反应 (伪MCR),一种使用重复反应物的合成策略,以创建复杂的分子. 这些反应为各种化学库和对称化合物提供了有效的途径.

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

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

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Last Updated: Jul 28, 2025

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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions

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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy
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Versatile CO2 Transformations into Complex Products: A One-pot Two-step Strategy

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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 有机化学
  • 合成化学 合成化学

背景情况:

  • 多元组分反应 (MCR) 是一种结合多个反应物的单合成.
  • 伪MCR涉及参与多个步骤或具有多个功能组的反应物.
  • 伪MCRs提供了高对称性潜力的复杂分子的高效合成.

研究的目的:

  • 审查近期伪MCR及其重复变体的进展.
  • 要突出新,复杂和高度对称的分子的合成.
  • 展示伪MCR在科学和技术中的应用.

主要方法:

  • 文献综述专注于过去二十年的出版物.
  • 基于参与试剂数量的伪MCRs的分类.
  • 反应机制和产品结构的分析.

主要成果:

  • 伪MCR可以在几个步骤中创建多种复合库.
  • 重复的伪MCR允许合成高度对称的分子.
  • 这些反应是产生复杂分子架构的宝贵工具.

结论:

  • 伪MCR是一种强大的合成方法,用于获取复杂和对称的化合物.
  • 该审查为未来研究提供了关于伪MCR的范围和潜力的见解.
  • 应用涵盖了各种科学和技术领域.