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Acid Halides to Esters: Alcoholysis01:12

Acid Halides to Esters: Alcoholysis

2.8K
Alcoholysis is a nucleophilic acyl substitution reaction in which an alcohol functions as a nucleophile. Acid halides react with alcohol to produce esters. The mechanism proceeds in three steps:
2.8K
Autoxidation of Ethers to Peroxides and Hydroperoxides02:23

Autoxidation of Ethers to Peroxides and Hydroperoxides

7.4K
Ethers represent a class of chemical compounds that become more dangerous with prolonged storage because they tend to form explosive peroxides when standing in the air. Autoxidation is the spontaneous oxidation of a compound in air. In the presence of oxygen, ethers slowly oxidize to form hydroperoxides and dialkyl peroxides.
7.4K
Regioselectivity of Electrophilic Additions-Peroxide Effect02:35

Regioselectivity of Electrophilic Additions-Peroxide Effect

8.4K
In the presence of organic peroxides, the addition of hydrogen bromide to an alkene yields the isomer that is not predicted by Markovnikov’s rule. For example, the addition of hydrogen bromide to 2-methylpropene in the presence of peroxides gives 1-bromo-2-methylpropane. This addition reaction proceeds via a free radical mechanism, which reverses the regioselectivity. The free radical reaction mechanism involves three stages: initiation, propagation, and termination.
8.4K
Nucleophilic Aromatic Substitution: Elimination–Addition01:11

Nucleophilic Aromatic Substitution: Elimination–Addition

4.0K
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...
4.0K
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

3.7K
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...
3.7K
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

17.8K
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
17.8K

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Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
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アリルボロンエステルの不純物は,持続的な光を発する.

Zhu Wu1,2, Christoph Herok3, Alexandra Friedrich1

  • 1Institute of Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.

Journal of the American Chemical Society
|November 5, 2024
PubMed
まとめ

アリルボロンエステルの室温の光 (RTP) は,化合物自体ではなく,しばしば不純物による. 精密な浄化によりRTPが除去されましたが,特定の不純物が長時間後発光を引き起こすことが判明しました.

さらに関連する動画

A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
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Metal-free Synthesis of Ynones from Acyl Chlorides and Potassium Alkynyltrifluoroborate Salts
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Metal-free Synthesis of Ynones from Acyl Chlorides and Potassium Alkynyltrifluoroborate Salts

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Synthesis of a Borylated Ibuprofen Derivative Through Suzuki Cross-Coupling and Alkene Boracarboxylation Reactions
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A Simple and Efficient Protocol for the Catalytic Insertion Polymerization of Functional Norbornenes
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Metal-free Synthesis of Ynones from Acyl Chlorides and Potassium Alkynyltrifluoroborate Salts
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Metal-free Synthesis of Ynones from Acyl Chlorides and Potassium Alkynyltrifluoroborate Salts

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科学分野:

  • 有機化学
  • フォト物理学
  • 材料科学

背景:

  • 最近の報告によると,アリルボロンエステルは室温の光 (RTP) を示し,システム間交差の確立された理論に異議を唱えている.
  • この性質はセキュリティ印刷,酸素センサー,バイオイメージングなどの用途に有効です.

研究 の 目的:

  • アリルボロンエステルのRTPの有効性を調査する.
  • 観測されたRTP現象は,不純物の固有特性か,人工物かを決定する.

主な方法:

  • クロマトグラフィー,再結晶化,および昇華を用いて,以前に報告された12のRTP活性アリルボロンエステルの合成および浄化.
  • 光物理学的性質の再検討,単結晶X線 difraktion,および理論的な研究.
  • 光が遅れた汚染物質の分離と特定

主要な成果:

  • 12種類の精製されたアリルボロンエステルはどれも持続的なRTPを示さなかった.
  • 汚染物質である4-アミノ-3,5-ビス (pinacolatoboryl) ベンゾニトリルは,3,5-ビス (pinacolatoboryl) ベンゾニトリルの光が遅れた原因として特定された.
  • 不純物の1.0モル%をドーピングすると,ダイマー電荷移転状態を通じた67ミリ秒の余光が誘発される.

結論:

  • アリルボロンエステルに関する以前の研究で観測されたRTPは,おそらく不純物によるものである.
  • 厳格な浄化は正確な光物理学の研究に不可欠です.
  • 特定の不純物で制御されたドーピングによって,長い後光を持つ材料を設計する戦略が実証されています.