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関連する概念動画

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.4K
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...
3.4K
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...
4.0K
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

7.8K
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.
7.8K
Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration02:40

Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration

8.7K
Introduction
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.       
8.7K
α-Alkylation of Ketones via Enolate Ions01:10

α-Alkylation of Ketones via Enolate Ions

3.2K
Ketones with α protons are deprotonated by strong bases like lithium diisopropylamide (LDA) to form enolate ions. The anion is stabilized by resonance, and its hybrid structure exhibits negative charges on the carbonyl oxygen and the α carbon. This ambident nucleophile can attack an electrophile via two possible sites: the carbonyl oxygen, known as O-attack, or the α carbon, known as C-attack. The nucleophilic attack via the carbanionic site is preferred. This is due to the...
3.2K
Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

10.5K
Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
10.5K

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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine
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Enzymatic Cascade Reactions for the Synthesis of Chiral Amino Alcohols from L-lysine

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触媒による非対称性のある水素活性化

Rajat Maji1, Santanu Ghosh1, Oleg Grossmann1

  • 1Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany.

Journal of the American Chemical Society
|April 12, 2023
PubMed
まとめ
この要約は機械生成です。

研究者らは,新しいイミドジフォスフォリミデート (IDPi) ブロンステッド酸触媒を使用して,触媒的非対称性のある水素酸化方法を開発した. この画期的な発見は 有機合成の長年の課題を解決し 効率的でスケーラブルな反応を可能にします

さらに関連する動画

Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes

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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
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関連する実験動画

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Catalytic Reactions at Amine-Stabilized and Ligand-Free Platinum Nanoparticles Supported on Titania During Hydrogenation of Alkenes and Aldehydes
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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis
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A Microwave-Assisted Direct Heteroarylation of Ketones Using Transition Metal Catalysis

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科学分野:

  • 有機化学
  • カタリシス
  • アシンメトリック・シンセシス

背景:

  • 電気愛好による乳化反応は有機合成において極めて重要です.
  • オレフィン系カルボキシル酸の触媒的非対称性ヒドロラクトニゼーションは依然として大きな課題です.
  • 以前の方法には 範囲と効率の限界があります

研究 の 目的:

  • 新しい触媒的非対称性ヒドロラクトニゼーション方法を開発する.
  • 長期にわたる原型性水乳化の問題に取り組むために
  • 拡張可能で汎用性の高い 合成経路を提供するためです

主な方法:

  • 閉じ込められたイミドディフォスフォリミダート (IDPi) ブロンステッド酸触媒を使用した.
  • 基板として使用されているオレフィンカルボキシル酸.
  • 物理化学およびDFT分析を用いた詳細なメカニズム研究を実施した.

主要な成果:

  • 触媒による非対称性のある水乳化が成功しました.
  • 操作のシンプルさ,スケーラビリティ,および幅広い基板の互換性を実証した.
  • (-) ボイビニアニンAと (+) ゴッソノロールの合成により,この方法の有用性を示した.

結論:

  • 開発された IDPi ブロンステッド酸触媒は,非対称な水素乳化を効果的に可能にします.
  • この方法は複雑な分子を合成するための 実践的で効率的なアプローチを提供します
  • メカニズムの洞察は,反応のエナチオ選択性についてより深い理解を提供します.