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関連する概念動画

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH301:11

ortho–para-Directing Activators: –CH3, –OH, –⁠NH2, –OCH3

6.3K
All ortho–para directors, excluding halogens, are activating groups. These groups donate electrons to the ring, making the ring carbons electron-rich. Consequently, the reactivity of the aromatic ring towards electrophilic substitution increases. For instance, the nitration of anisole is about 10,000 times faster than the nitration of benzene. The electron-donating effect of the methoxy group in anisole activates the ortho and para positions on the ring and stabilizes the corresponding...
6.3K
Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)01:30

Nucleophilic Aromatic Substitution: Addition–Elimination (SNAr)

4.0K
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...
4.0K
Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions01:20

Diazonium Group Substitution with Halogens and Cyanide: Sandmeyer and Schiemann Reactions

2.0K
Arenediazonium substitution reactions occur when the diazonium group is substituted by various functional groups such as halides, hydroxyl, nitrile, etc. For instance, arenediazonium salts react with copper(I) salts of chloride, bromide, or cyanide to form corresponding aryl chlorides, bromides, and nitriles. These reactions are named Sandmeyer reactions. Although the mechanism of this reaction is complicated, as illustrated in Figure 1, they are believed to progress via an aryl copper...
2.0K
[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement01:21

[3,3] Sigmatropic Rearrangement of 1,5-Dienes: Cope Rearrangement

2.8K
The Cope rearrangement is classified as a [3,3] sigmatropic shift in 1,5-dienes, leading to a more stable, isomeric 1,5-diene. The reaction involves a concerted movement of six electrons, four from two π bonds and two from a σ bond, via an energetically favorable chair-like transition state.
2.8K
Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry01:29

Diels–Alder Reaction Forming Bridged Bicyclic Products: Stereochemistry

4.8K
Diels–Alder reactions between cyclic dienes locked in an s-cis configuration and dienophiles yield bridged bicyclic products.
4.8K
Stability of Substituted Cyclohexanes02:30

Stability of Substituted Cyclohexanes

13.0K
This lesson discusses the stability of substituted cyclohexanes with a focus on energies of various conformers and the effect of 1,3-diaxial interactions.
The two chair conformations of cyclohexanes undergo rapid interconversion at room temperature. Both forms have identical energies and stabilities, each comprising equal amounts of the equilibrium mixture. Replacing a hydrogen atom with a functional group makes the two conformations energetically non-equivalent.
For example, in...
13.0K

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関連する実験動画

Updated: Sep 10, 2025

Solid-phase Synthesis of [4.4] Spirocyclic Oximes
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Solid-phase Synthesis of [4.4] Spirocyclic Oximes

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6.9K

7 メンバーのリングのリモート機能化のための移動グループ戦略

Wenlai Han1, Taehwan Hwang1,2, Christina Lian1

  • 1Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States.

Journal of the American Chemical Society
|August 19, 2025
PubMed
まとめ
この要約は機械生成です。

研究者達は 複雑な7つの環を合成する 新しい光触媒の方法を開発しました この戦略は,サイクルケトンの直接的な機能化を可能にし,価値ある生物活性化合物へのより効率的な経路を提供します.

さらに関連する動画

Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange

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関連する実験動画

Last Updated: Sep 10, 2025

Solid-phase Synthesis of [4.4] Spirocyclic Oximes
05:15

Solid-phase Synthesis of [4.4] Spirocyclic Oximes

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Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay
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Functionalized Spirocyclic Heterocycle Synthesis and Cytotoxicity Assay

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Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
04:51

Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange

Published on: June 23, 2023

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科学分野:

  • 有機化学
  • 合成方法論
  • 光触媒

背景:

  • 7つある環は 生物活性分子に不可欠ですが 合成するのは困難です
  • 伝統的な方法はしばしば複雑なリングアセンブリまたは事前機能化されたビルディングブロックを必要とします.
  • シンプルなサイクル前駆体による直接的機能化は,魅力的な合成代替品です.

研究 の 目的:

  • 代用7つ環の合成のための新しい光触媒戦略を開発する.
  • 簡単に入手できるサイクル前駆物質の直接的機能化を可能にします.
  • 中型リングの現在の合成方法の限界に対処する.

主な方法:

  • ナトリウムデカトゥングステートとチオールコカタライストを用いた光触媒的環状ケトン移動
  • 軽い条件下で発光ダイオード (LED) の照射を使用する.
  • リバーシブルな水素原子移転とラジカル媒介による移住を含むダイナミックな運動的アプローチを使用します.

主要な成果:

  • 1,1-非置換されたアシルサイクロヘプタンを1,4-非置換された製品に変換する.
  • サイト選択C-H機能化の実証 七つ組のリング内
  • 密度の高い7つ組のリングシステムへの地域選択的なアクセス

結論:

  • 開発された光触媒法では,効率的で地域選択的な方法で7つの環を代用します.
  • この戦略は,従来の中型リングの合成に伴う課題を克服します.
  • このアプローチは,医薬品化学と材料科学における複雑な分子構造にアクセスするための貴重な新しいツールを提供します.