関連する実験動画
Updated: Jul 3, 2025

10:44
Isolating Free Carbenes, their Mixed Dimers and Organic Radicals
Published on: April 19, 2019
10.8K
トリプル・ラジカル・ソートによるアルケンのダイアキル化
Johnny Z Wang1, William L Lyon1, David W C MacMillan2
1Merck Center for Catalysis at Princeton University, Princeton, NJ, USA.
Nature
|February 13, 2024
まとめ
双分子同溶性置換 (SH2) 触媒は,C
科学分野:
- 有機化学
- カタリシス
- 合成方法論
背景:
- 双分子同溶性置換 (SH2) 触媒はクロスカップリング反応を進めている.
- 既存のSH2方法は,主,二次,または三次ラジカルの選択的組み合わせを可能にします.
- 主要な課題は,アルケンの同時ダイアキル化による基質分類です.
研究 の 目的:
- アルケンのダイアキル化のための新しいSH2触媒的アプローチを開発する.
- 2つのC ((sp3) -C ((sp3) の結合を同時に構築することを可能にします.
- 統計的リコンビネーションと副作用の限界を克服するために
主な方法:
- 双分子同溶性置換 (SH2) 触媒を用いる.
- 3つの異なる根幹の種を in situ 生成する.
- 大きさと電子特性に基づいて 根本的に分類する.
主要な成果:
- 活性化されていないアルケンの地域選択的ダイアルキル化が達成された.
- アルケンの間で 電子性と核性ラジカルを 順番に分類した.
- C ((sp3) -C ((sp3) の結合を形成する新しい経路を示した.
結論:
- この研究は,アルケンのダイアキル化のための明確なメカニズム的アプローチを確立する.
- 開発されたSH2触媒は,C
3) 豊富な分子へのアクセスを加速します. - この方法論は,根基ベースのクロスカップリング反応の範囲を拡大します.
関連する概念動画
Radical Anti-Markovnikov Addition to Alkenes: Mechanism
3.8K
The reaction of hydrogen bromide with alkenes in the presence of hydroperoxides or peroxides proceeds via anti-Markovnikov addition. The radical chain reaction comprises initiation, propagation, and termination steps.
The mechanism starts with chain initiation, which involves two steps. In the first chain initiation step, a weak peroxide bond is homolytically cleaved upon mild heating to form two alkoxy radicals. In the second initiation step, a hydrogen atom is abstracted by the alkoxy...
The mechanism starts with chain initiation, which involves two steps. In the first chain initiation step, a weak peroxide bond is homolytically cleaved upon mild heating to form two alkoxy radicals. In the second initiation step, a hydrogen atom is abstracted by the alkoxy...
3.8K
Radical Reactivity: Nucleophilic Radicals
2.1K
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...
2.1K
Radical Anti-Markovnikov Addition to Alkenes: Overview
3.4K
The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
3.4K
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
Free-Radical Chain Reaction and Polymerization of Alkenes
7.8K
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.
7.8K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation
7.7K
Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.
7.7K

