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関連する概念動画

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction01:15

α-Bromination of Carboxylic Acids: Hell–Volhard–Zelinski Reaction

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The method to achieve α-brominated carboxylic acids using a mixture of phosphorus tribromide and bromine is known as the Hell–Volhard–Zelinski reaction. The reaction is catalyzed by phosphorus tribromide, which can be used directly or produced in situ from red phosphorus and bromine. The mechanism comprises PBr3 catalyzed conversion of acid to acid bromide and hydrogen bromide. The acid bromide enolizes to its enol form in the presence of HBr. The nucleophilic enol attacks the...
3.1K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
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Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids02:04

Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids

6.0K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
6.0K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

8.6K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
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Base-Promoted α-Halogenation of Aldehydes and Ketones00:51

Base-Promoted α-Halogenation of Aldehydes and Ketones

3.6K
α-Halogenation of aldehydes and ketones is a reaction involving the substitution of α hydrogens with halogens in the presence of a base.  The reaction begins with the abstraction of  α hydrogen by the base to produce a nucleophilic enolate ion. This intermediate undergoes a subsequent nucleophilic substitution with the halogen to produce a monohalogenated carbonyl compound. If the starting substrate has more than one α hydrogen, it is difficult to stop the reaction...
3.6K
Acid-Catalyzed α-Halogenation of Aldehydes and Ketones01:21

Acid-Catalyzed α-Halogenation of Aldehydes and Ketones

4.0K
By replacing an α-hydrogen with a halogen, acid-catalyzed α-halogenation of aldehydes or ketones yields a monohalogenated product
In the first step of the mechanism, the acid protonates the carbonyl oxygen resulting in a resonance-stabilized cation, which subsequently loses an α-hydrogen to form an enol tautomer. The C=C bond in an enol is highly nucleophilic because of the electron-donating nature of the –OH group. Consequently, the double bond attacks an electrophilic halogen to form a...
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Mizoroki-Heck Cross-coupling Reactions Catalyzed by Dichloro{bis[1,1',1''-phosphinetriyltripiperidine]}palladium Under Mild Reaction Conditions
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黄金触媒ヘック反応

Vivek W Bhoyare1, E Daiann Sosa Carrizo2, Chetan C Chintawar1

  • 1Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhauri, Bhopal 462 066, India.

Journal of the American Chemical Society
|April 16, 2023
PubMed
まとめ

この研究は,Au (I) /Au (III) リドックス触媒を用いた新しい金触媒ヘック反応を導入する. 既存の方法の限界を克服し,金化学で初めて重要な有機金属のステップを達成しました.

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Palladium N-Heterocyclic Carbene Complexes: Synthesis from Benzimidazolium Salts and Catalytic Activity in Carbon-carbon Bond-forming Reactions
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科学分野:

  • 有機金属化学
  • キャタリシス
  • 合成有機化学

背景:

  • 伝統的なヘック反応はしばしば特殊な基板を必要とし,チェーンウォーキングにより望ましくないレジオアイソマーを生成することがあります.
  • 黄金の触媒は 独特の反応性を持っていますが ヘック反応のような複雑な変換を達成することは 依然として困難です

研究 の 目的:

  • リガンドで活性化されたAu (I) /Au (III) リドックスサイクルを用いた新しい金触媒ヘック反応を開発する.
  • 黄金の化学における移動性挿入とβ-水素除去を含む基本的な有機金属的ステップの触媒的実現を実証する.
  • 既存の移行金属触媒ヘック反応の限界を克服するために,特に基板範囲と地域選択性について.

主な方法:

  • Au (I) /Au (III) リドックスサイクルを可能にするために,特定のリガンドを持つ金触媒システムを利用した.
  • 主要な有機金属の変異を伴うメカニズムを調査した. 移動性挿入とβ-ヒドリド除去.
  • 領域選択性と基板の範囲を,既知の移行金属触媒ヘック反応と比較した.

主要な成果:

  • リンガンド活性化Au (I) /Au (III) 還酸化反応により,金で触媒化されたヘック反応を成功させた.
  • 金化学で初めて,移動性挿入とβ-水素除去の触媒的発生を示した.
  • 特殊な基板と望ましくないチェーンウォーキングプロセスを避け,以前の方法の限界を克服しました.
  • 他の移行金属触媒と比較して補完的な地域選択性を達成した.

結論:

  • 開発された金触媒ヘック反応は,有機金属化学の重要な進歩を表しています.
  • この方法論は,ゴールド触媒を用いたヘック結合のための新しい,効率的で地域選択的な経路を提供します.
  • 金を媒介する有機合成のための新しい道を開く.