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関連する概念動画

¹H NMR: Long-Range Coupling01:27

¹H NMR: Long-Range Coupling

2.4K
The coupling interactions of nuclei across four or more bonds are usually weak, with J values less than 1 Hz. While these are usually not observed in spectra, the presence of multiple bonds along the coupling pathway can result in observable long-range coupling.
In alkenes, spin information is communicated via σ–π overlap, as seen in allylic (four-bond) and homoallylic (five-bond) couplings. These coupling interactions are stronger when the σ bond is parallel to the alkene...
2.4K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

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Simple aryl halides do not react with nucleophiles. However, nucleophilic aromatic substitutions can be forced under certain conditions, such as high temperatures or strong bases. The mechanism of substitution under such conditions involves the highly unstable and reactive benzyne intermediate. Benzyne contains equivalent carbon centers at both ends of the triple bond, each of which is equally susceptible to nucleophilic attack. This 50–50 distribution of products is...
4.9K
Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

Aryldiazonium Salts to Azo Dyes: Diazo Coupling

3.5K
The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the para...
3.5K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

8.8K
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.
8.8K
Carboxylic Acids to Methylesters: Alkylation using Diazomethane01:33

Carboxylic Acids to Methylesters: Alkylation using Diazomethane

2.7K
Carboxylic acids react with diazomethane in an ether solvent via alkylation at the carboxylate oxygen atom to give methyl esters of the corresponding acid with excellent yields.
2.7K
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

4.5K
Nucleophilic substitution in aromatic compounds is feasible in substrates bearing strong electron-withdrawing substituents positioned ortho or para to the leaving group. The reaction proceeds via two steps: the addition of the nucleophile and the elimination of the leaving group.
The reaction begins with an attack of the nucleophile on the carbon that holds the leaving group. This results in the delocalization of the π electrons over the ring carbons. The resonance interaction between...
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アリル移行による二酸化窒素と炭化水素の結合

Sean F McWilliams1, Daniël L J Broere1,2, Connor J V Halliday3

  • 1Department of Chemistry, Yale University, New Haven, CT, USA.

Nature
|August 14, 2020
PubMed
まとめ

研究者は,豊富な炭化水素と大気中の窒素 (N2) を活性化してアニリン誘導体を生成する鉄触媒システムを開発した. この突破により,N2を炭化水素と直接結合させ,新しい触媒方法の開拓が可能になった.

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科学分野:

  • * 無機化学
  • * 触媒
  • * 有機金属化学

背景:

  • 炭化水素や大気中の窒素 (N2) のような惰性分子を活性化することは,化学における重要な課題です.
  • N2から炭素-窒素結合を形成する伝統的な方法は,N2活性化に必要な還元条件と相容れない反応性有機前駆物質を必要とし,触媒的応用を妨げます.

研究 の 目的:

  • ベンゼンとN2を連続的に活性化できる新しいディケチミナート製鉄システムを報告する.
  • N2を窒素源として使用して,石油由来アレンをシリ化アニリン誘導体に単発変換することを実証する.

主な方法:

  • * ディケチミナートによる鉄ブロミド複合体を使用した.
  • * ナトリウム粉,クラウンエーテル,トリメチルシリルブロミド,N2を含む反応混合物を使用した.
  • * 反応経路に沿って分離され,特徴づけられた中間化合物.

主要な成果:

  • ベンゼンとN2を順次活性化メカニズムで結合してアニリン誘導体を形成する.
  • * 複数のアレンをシライル化アニリンに単発変換した.
  • * 提案された反応機構を支える主要な中間物質を特定し,特徴づけました.

結論:

  • * 開発された鉄系は,大気中の窒素と豊富な炭化水素の直接結合を可能にします.
  • この戦略は,アニリン誘導体を合成するための新しい経路を提供し,N2機能化のための触媒システムの開発を進めています.