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関連する概念動画

Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.8K
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...
2.8K
Radical Reactivity: Electrophilic Radicals01:02

Radical Reactivity: Electrophilic Radicals

2.5K
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...
2.5K
Radical Reactivity: Steric Effects01:10

Radical Reactivity: Steric Effects

2.6K
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...
2.6K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

3.6K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
3.6K
Radical Reactivity: Nucleophilic Radicals01:16

Radical Reactivity: Nucleophilic Radicals

2.7K
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...
2.7K
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

9.9K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
9.9K

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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

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フロレンイル基のマクロサイクルポリラジカロイド

Xuefeng Lu1, Sangsu Lee2, Yongseok Hong2

  • 1Department of Chemistry, National University of Singapore , 3 Science Drive 3, 117543 Singapore.

Journal of the American Chemical Society
|August 26, 2017
PubMed
まとめ
この要約は機械生成です。

調節可能なスピン相互作用を持つ安定したマクロサイクルポリラジカロイドが合成された. 幾何学は,それらの電子的および光学的性質に大きく影響し,一部のものは反芳香性を示す.

さらに関連する動画

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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions

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Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach
14:11

Synthesis of pH Dependent Pyrazole, Imidazole, and Isoindolone Dipyrrinone Fluorophores using a Claisen-Schmidt Condensation Approach

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Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
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Cercosporin-Photocatalyzed [4+1]- and [4+2]-Annulations of Azoalkenes Under Mild Conditions
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科学分野:

  • 有機化学
  • 材料科学
  • 超分子化学

背景:

  • ポリラジカロイドの分子内スピン・スピン相互作用の制御は,高度な有機物質の開発に不可欠です.
  • 安定した,明確に定義されたマクロサイクルポリラジカロイドは,合成および特徴づけに困難です.

研究 の 目的:

  • 新しいフローレニル基のマクロサイクルポリラジカロイドを合成し,特徴づけること.
  • エチニレン・スペーサーの存在を含む分子幾何学の電子と磁気特性への影響を調査する.
  • マクロサイクルポリラジカロイドの性質を,その線形同位体と比較する.

主な方法:

  • マクロサイクルポリラジカロイドの3つの異なる合成経路の開発.
  • 標準のシリカゲルカラムクロマトグラフィを用いた浄化.
  • 制限されたアクティブスペース・スピン・フリップ (RASSF) メソッドを用いた計算分析
  • 超伝導量子干渉装置 (SQUID) の測定を用いた磁気特性.
  • 光学および電気化学的性質の評価

主要な成果:

  • 安定したフローレニル基のマクロサイクルポリラジカロイド (FR-MCnとMC-FnAn) の2つのシリーズの合成に成功しました.
  • 反鉄磁性スピン・スピン相互作用による計算された中程度の多基性特性.
  • ポリラジカル特性,刺激エネルギー,吸収特性に対する幾何学 (歪曲角度,エチニレンスペーサー) の有意な影響を示した.
  • 周期的π結合から生じるマクロサイクリックテトラマー (FR-MC4およびMC-F4A4) の全般的な反芳香特性.

結論:

  • 合成戦略は,環境条件下で安定したマクロサイクルポリラジカロイドへのアクセスを提供します.
  • 分子幾何学はこれらのシステムの電子,光学,磁気特性の重要な決定因子です.
  • 特定のマクロサイクル構造における反芳香性の発見は,電子材料の探索のための新しい道を開きます.