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相关概念视频

Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

1.9K
The presence of electron-donating, electron-withdrawing, or conjugating groups adjacent to a radical center, imparts electronic stabilization to the radicals. Examples of such electronically-stabilized radicals are triphenylmethyl, tetramethylpiperidine‐N‐oxide, and 2,2‐diphenyl‐1‐picrylhydrazyl. These radicals are remarkably stable and are known as persistent radicals. Some of the persistent radicals can even be isolated and purified.
Along with electronic...
1.9K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.0K
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...
2.0K
Radical Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

1.7K
Radical reactions can occur either intermolecularly or intramolecularly. In an intermolecular radical reaction, a nucleophilic radical adds to an electrophilic alkene or vice versa. In such reactions, the radical and generally the alkene, which is also called the radical trap, are two different molecules. Additionally, for such intermolecular reactions to occur, the radical trap must be active, present in an excess concentration, and the radical starting material must have a weak...
1.7K
Radical Halogenation: Stereochemistry01:33

Radical Halogenation: Stereochemistry

3.6K
Stereochemistry is the study of the different spatial arrangements of atoms in a given molecule. The stereochemistry of radical halogenations can be understood from three different situations:
Halogenation to form a new chiral center:
3.6K
Radical Formation: Addition00:47

Radical Formation: Addition

1.6K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
1.6K
Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

2.0K
Radicals adjacent to electron-donating groups are called nucleophilic radicals. These radicals readily react with electrophilic alkenes. The SOMO–LUMO interactions are the driving force for the reaction, where the high-energy SOMO of the electron-rich, nucleophilic radicals interacts with the low-energy LUMO of the electron-deficient, electrophilic alkenes. Such SOMO–LUMO interactions are the basis of reactive radical traps, affecting the selectivity in radical reactions. For...
2.0K

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Updated: May 10, 2025

Retropinacol/Cross-pinacol Coupling Reactions - A Catalytic Access to 1,2-Unsymmetrical Diols
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立体激进交叉合

Jiawei Sun1, Jiayan He1, Luca Massaro1

  • 1Department of Chemistry, Scripps Research, 10550 North Torrey Pines Road, La Jolla, CA, USA.

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|April 22, 2025
PubMed
概括
此摘要是机器生成的。

这项研究引入了一种新的酶选择性基因交叉合方法,克服了立体化学控制方面的挑战. 它使用易于获得的材料和廉价的催化剂实现立体特异反应.

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科学领域:

  • 有机化学
  • 催化剂
  • 立体选择合成

背景情况:

  • 由于温和的条件和高的化学选择性,激素交叉合为合成复杂分子提供了优势,特别是在和系统中.
  • 然而,由于激素中间体的快速种族化,实现对抗特异性基因交叉合是一个重大挑战.
  • 之前的方法依赖于定制的性联体或二分选择性控制,限制了更广泛的适用性.

研究的目的:

  • 开发一种对抗特异性基因交叉合的通用和有效方法.
  • 为了实现与 (异质) 化物结合的固态和固态合.
  • 在激进反应中控制立体化学的固有困难.

主要方法:

  • 使用易于获得的富含硫基化物作为基质前体.
  • 使用低负荷的廉价,无催化剂.
  • 在和 (异质) 化物之间进行了基结交联反应.
  • 进行计算研究以阐明反应机制.

主要成果:

  • 实现了第一个因子特异性和立体性基因交叉合的例子.
  • 证明了硫化和阿基拉催化在这种转化中的有用性.
  • 展示了与 (异质) 化物结合的基碎片,不含奇拉连接物或外部氧化还原剂.
  • 计算分析发现一种独特的结介质,通过N2挤出促进了C-C键的形成.

结论:

  • 这项工作在选基化学方面取得了突破,为立体特异性C-C键形成提供了实用解决方案.
  • 通过精确的立体化学控制,开发的方法扩大了激素交叉合的范围.
  • 这些发现为使用激素途径更有效地合成复杂的性分子铺平了道路.