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関連する概念動画

Hydroboration-Oxidation of Alkenes03:08

Hydroboration-Oxidation of Alkenes

9.4K
In addition to the oxymercuration–demercuration method, which converts the alkenes to alcohols with Markovnikov orientation, a complementary hydroboration-oxidation method yields the anti-Markovnikov product. The hydroboration reaction, discovered in 1959 by H.C. Brown, involves the addition of a B–H bond of borane to an alkene giving an organoborane intermediate. The oxidation of this intermediate with basic hydrogen peroxide forms an alcohol.
9.4K
Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

8.6K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.6K
Radicals: Electronic Structure and Geometry01:07

Radicals: Electronic Structure and Geometry

4.3K
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...
4.3K
Radical Formation: Addition00:47

Radical Formation: Addition

1.9K
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...
1.9K
Radical Reactivity: Overview01:11

Radical Reactivity: Overview

2.2K
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...
2.2K
Radical Substitution: Allylic Bromination01:27

Radical Substitution: Allylic Bromination

5.6K
In organic synthesis, the formation of products can be altered by changing the reaction conditions. For example, a dibromo addition product is formed when propene is treated with bromine at room temperature. In contrast, propene undergoes allylic substitution in non-polar solvents at high temperatures to give 3-bromopropene. In order to avoid the addition reaction, the bromine concentration must be kept as low as possible throughout the reaction. This can be achieved using N-bromosuccinimide...
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Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
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ボロン含有有機ディラジカロイド:ルイス酸塩配合によるダイナミックに調節されるシングレットディラジカル特性

Jiaxiang Guo1, Yue Yang1, Chuandong Dou1

  • 1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun 130012, People's Republic of China.

Journal of the American Chemical Society
|October 19, 2021
PubMed
まとめ

研究者らは 独特の電子と磁気特性を 備えた安定したボロンを含む有機ディラジカロイドを開発しました これらの新しい材料はルイス酸性とダイナミックなダイラジカル性質の調節を示し,有機電子学の新しい道を開きます.

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科学分野:

  • 材料科学
  • 有機化学
  • 超分子化学

背景:

  • 有機ディラジカロイドは,有機電子とスピントロニクスにとって重要なユニークなオープンシェル構造を持っています.
  • ヘテロ原子を組み込むことは電子構造を変更しますが,高反応性のため,ボロンを含むディラジカロイドは困難です.

研究 の 目的:

  • 新しい,安定したボロンを含む有機ディラジカロイドを合成し,特徴づけること.
  • 磁気,光電子,ルイス酸性について調べる

主な方法:

  • 二つの同位体ボロン含有ポリサイクル炭化水素 (PHs) をインデノフルオレンπ骨格に平面化されたトリアリルボランを組み込むことによって合成する.
  • 構造と特性を確認するための理論的計算と実験的特徴付け.

主要な成果:

  • 合成された安定した,環境に適合する,ボロンを含んだ有機ディラジカロイドと,オープンシェルのシングレットディラジカル構造.
  • 観測された独特の磁気特性 (熱的にアクセス可能な三重体種) と光電子特性 (狭いエネルギーギャップ).
  • 重要なルイス酸性とルイス添加物を形成する能力,動的に調節する芳香性とダイラジカルな性格を示した.

結論:

  • 安定したボロンを含む有機ディラジカロイドの合成に成功し,以前の反応性の課題を克服しました.
  • これらの化合物は,前例のないルイス酸性とダイナミックコントロールをディラジカル特性で表しています.
  • この発見は,高度な有機電子とスピントロニックの応用のための新しい可能性を提供します.