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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
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.9K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.9K
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 Reactivity: Intramolecular vs Intermolecular01:33

Radical Reactivity: Intramolecular vs Intermolecular

1.8K
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...
1.8K
Cycloaddition Reactions: MO Requirements for Photochemical Activation01:12

Cycloaddition Reactions: MO Requirements for Photochemical Activation

2.1K
Some cycloaddition reactions are activated by heat, while others are initiated by light. For example, a [2 + 2] cycloaddition between two ethylene molecules occurs only in the presence of light. It is photochemically allowed but thermally forbidden.
2.1K
ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

6.1K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
6.1K

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関連する実験動画

Updated: Jul 26, 2025

Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI
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Preparation and Reactivity of a Triphosphenium Bromide Salt: A Convenient and Stable Source of PhosphorusI

Published on: November 22, 2016

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持続的なリンを中心としたシングレットテトララジカルの合理的な設計と小分子活性化におけるその使用

Edgar Zander1, Jonas Bresien1, Vladimir V Zhivonitko2

  • 1Institut für Chemie, Universität Rostock, Albert-Einstein-Straße 3a, 18059 Rostock, Germany.

Journal of the American Chemical Society
|June 14, 2023
PubMed
まとめ
この要約は機械生成です。

研究者達は 安定したリンを中心とした 4基の基を持つ分子を合成しました この新型テトララジカルは 水素やアルキンのような小さな分子を活性化し 化学合成の新たな道を開きます

さらに関連する動画

Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus
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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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関連する実験動画

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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus
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Preparation and Use of Carbonyl-decorated Carbenes in the Activation of White Phosphorus

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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科学分野:

  • 化学について
  • 材料科学

背景:

  • ビラジカルは化学反応における重要な中間物質ですが,テトラジカルは安定性の問題により理解が少ない.
  • 持続的なテトララジカルは小分子活性化に不可欠ですが,分離することは困難です.

研究 の 目的:

  • 持続的なリンを中心とした四原素を合成し特徴づけること.
  • 小分子活性化におけるこれらの四根素の潜在能力を探求する.

主な方法:

  • s-hydrindacenyl骨格のリン基基部位を体系的に調査する.
  • 新しいP中心の四基素の合成と分離.
  • 比較分析のための量子力学的計算
  • パラヒドロゲン誘発ハイパーポラライゼーション NMR研究およびメカニズム解明のためのDFT計算.

主要な成果:

  • 持続性のあるP中心のシングレットテトララジカル (2,6-ディアザ-1,3,5,7-テトラフォスファ-s-ヒドリンダセン-1,3,5,7-テトライル) の成功分離.
  • H2やアルキンのような小さな分子を活性化するためのテトララジカルの有用性を証明した.
  • 量子力学的な計算により,マルチリファレンス特性,ラジカル電子結合,および芳香性についての洞察が明らかになった.
  • 強いラジカル電子結合により 選択的な小分子配列活性化が可能である.

結論:

  • 安定したを中心とした四基素が合成され,特徴づけられた.
  • このテトララジカルは小分子活性化と触媒の応用が有望である.
  • 詳細なメカニズムの研究は,その反応性の基本的な理解を提供します.