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関連する概念動画

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
Radical Formation: Addition00:47

Radical Formation: Addition

1.7K
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...
1.7K
Radical Reactivity: Electrophilic Radicals01:02

Radical Reactivity: Electrophilic Radicals

1.9K
Radicals adjacent to electron‐withdrawing groups are called electrophilic radicals. These radicals readily react with nucleophilic alkenes. For example, the malonate radical, in which the radical center is flanked by two electron‐withdrawing groups, reacts readily with butyl vinyl ether, which consists of an electron‐donating oxygen substituent. The reaction between electrophilic malonate radical and nucleophilic vinyl ether is favored because the radical has a...
1.9K
Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.0K
This lesson delves into the geometry of a radical, which is influenced by the electronic structure of the molecule. The principle is similar to that of a lone pair, where the unpaired electron influences the geometry at the radical center.
Accordingly, the structure of a trivalent radical lies between the geometries of carbocations and carbanions. An sp2-hybridized carbocation is trigonal planar, while an sp3-hybridized carbanion is trigonal pyramidal. Here, the difference in geometry is...
4.0K
Radical Formation: Overview01:03

Radical Formation: Overview

2.1K
A bond can be broken either by heterolytic bond cleavage to form ions or homolytic bond cleavage to yield radicals. A fishhook arrow is used to represent the motion of a single electron in homolytic bond cleavage. There are two main sources from which radicals can be formed:
Radicals from spin-paired molecules:
Radicals can be obtained from spin-paired molecules either by homolysis or electron transfer. While two radicals are formed in the former, an electron is added in the...
2.1K
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

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関連する実験動画

Updated: Jun 11, 2025

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
10:34

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow

Published on: April 24, 2014

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根本的な二極性

Jacob J A Garwood1, Andrew D Chen1, David A Nagib1

  • 1Department of Chemistry and Biochemistry, The Ohio State University, Columbus, Ohio 43210, United States.

Journal of the American Chemical Society
|October 4, 2024
PubMed
まとめ
この要約は機械生成です。

化学反応を制御する鍵となるものです この研究は,反応性を予測し,合成結果を改善するために,実験的に検証されたデータベースを作成し,ラジカル電友性および核友性を定量化します.

さらに関連する動画

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

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関連する実験動画

Last Updated: Jun 11, 2025

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow
10:34

Exploring the Radical Nature of a Carbon Surface by Electron Paramagnetic Resonance and a Calibrated Gas Flow

Published on: April 24, 2014

10.7K
Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
10:44

Isolating Free Carbenes, their Mixed Dimers and Organic Radicals

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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds
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Using Cyclic Voltammetry, UV-Vis-NIR, and EPR Spectroelectrochemistry to Analyze Organic Compounds

Published on: October 18, 2018

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科学分野:

  • 有機化学
  • コンピュータ化学
  • 物理化学

背景:

  • 化学合成における反応性と選択性に大きな影響を与える.
  • この影響を予測し,定量化することは,反応の発展にとって極めて重要です.

研究 の 目的:

  • 500以上のラジカルの電友性/核友性を計算する.
  • これらの計算された極性を実験的に検証する.
  • 根本的極性と反応性と選択性を相関させる予測モデルを確立する.

主な方法:

  • 密度関数理論 (DFT) による計算で,500以上のラジカルに対して電友性/核友性 (ω) を決定する.
  • >50のC中心,N中心,O中心のラジカルによる競争実験を用いた実験的検証.
  • 計算された極性と定量化された相対反応性 (k_rel) の間の相関分析.

主要な成果:

  • 一般的な合成中介物質の 計算された根極性に関する包括的なデータベース
  • 実験的検証により,計算された極性と測定された反応性との間に高い相関が確認された.
  • 電気性 (ω) と相対的反応性 (k_rel) の間に強い関係が観察され,小さな極性変化が有意な速度の向上をもたらした.

結論:

  • 実験的に検証されたデータベースは,急性反応性と選択性の正確な予測を可能にします.
  • 極性対応の速度強化を利用することで,合成反応の開発を最適化できます.
  • このリソースは,新しい合成経路のトラブルシューティングと設計に役立ちます.