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関連する概念動画

Cycloaddition Reactions: Overview01:16

Cycloaddition Reactions: Overview

2.8K
Cycloadditions are one of the most valuable and effective synthesis routes to form cyclic compounds. These are concerted pericyclic reactions between two unsaturated compounds resulting in a cyclic product with two new σ bonds formed at the expense of π bonds. The [4 + 2] cycloaddition, known as the Diels–Alder reaction, is the most common. The other example is a [2 + 2] cycloaddition.
2.8K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction

10.5K
The Diels–Alder reaction is an example of a thermal pericyclic reaction between a conjugated diene and an alkene or alkyne, commonly referred to as a dienophile. The reaction involves a concerted movement of six π electrons, four from the diene and two from the dienophile, forming an unsaturated six-membered ring. As a result, these reactions are classified as [4+2] cycloadditions.
10.5K
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

2.9K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
2.9K
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

18.9K
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.
18.9K
Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene01:14

Electrophilic 1,2- and 1,4-Addition of X2 to 1,3-Butadiene

2.7K
Electrophilic addition of halogens to alkenes proceeds via a cyclic halonium ion to form a 1,2-dihalide or a vicinal dihalide.
2.7K
Regioselectivity and Stereochemistry of Hydroboration02:36

Regioselectivity and Stereochemistry of Hydroboration

8.4K
A significant aspect of hydroboration–oxidation is the regio- and stereochemical outcome of the reaction.
Hydroboration proceeds in a concerted fashion with the attack of borane on the π bond, giving a cyclic four-centered transition state. The –BH2 group is bonded to the less substituted carbon and –H to the more substituted carbon. The concerted nature requires the simultaneous addition of –H and –BH2 across the same face of the alkene giving syn...
8.4K

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関連する実験動画

Updated: Sep 9, 2025

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

11.6K

ビサイクロ[2.2.1]ヘプタンの合成 ピリジン・ボロニル・ラジカル・カタライズ [2π + 2σ] サイクル添加

Saima Perveen1, Lulu Qin2, Tao Yu2

  • 1School of Chemistry, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.

The Journal of organic chemistry
|September 1, 2025
PubMed
まとめ

この研究は,ビサイクロ[2.2.1]ヘプタン (BCHeps) の合成のための効率的なピリジン補助ボロニル基触媒を導入する. Bicyclo[2.1.0]pentanes (BCPs) は,アルケーンとの新しい [2π + 2σ]サイクロアディションの構成要素として機能する.

さらに関連する動画

Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
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Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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関連する実験動画

Last Updated: Sep 9, 2025

Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
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Preparation of a Corannulene-functionalized Hexahelicene by CopperI-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

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Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles
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Preparation of Stable Bicyclic Aziridinium Ions and Their Ring-Opening for the Synthesis of Azaheterocycles

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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst
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[DPEPhosbcpCu]PF6: A General and Broadly Applicable Copper-Based Photoredox Catalyst

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科学分野:

  • 有機化学
  • カタリシス
  • 合成方法論

背景:

  • ビサイクロ[2.2.1]ヘプタン (BCHeps) は,天然製品や医薬品における重要な構造モチーフである.
  • BCHepsのための効率的でスケーラブルな合成経路の開発は,有機合成における重要な課題です.

研究 の 目的:

  • ビサイクロ[2.2.1]ヘプタン (BCHeps) の合成のための新しく効率的な方法を開発する.
  • サイクル添加反応における多用途な構成要素として,ビサイクロ[2.1.0]ペンタン (BCP) を利用する.
  • [2π + 2σ]サイクロアディションのためのピリジン補助のボロニル基触媒を確立する.

主な方法:

  • 様々なアルケンの [2π + 2σ]サイクル添加反応における基質としてビサイクロ[2.1.0]ペンタン (BCP) を使用する.
  • ピリジン補助のボロニル基触媒系を用いて変換する.
  • 基板の範囲を調査し,下流合成の有用性を実証する.

主要な成果:

  • BCHepsのモジュール式および原子経済的な合成が達成されました.
  • 反応はシンプルで安価な触媒を用いて効率的に進みます
  • 一連のBCHeps誘導体が合成され,妥当な反応機構が提案された.

結論:

  • 開発されたピリジン・アシスタント・ボロニル・ラジカル・カタリシスは,BCHeps合成のための強力な新しい戦略を提供します.
  • この方法は,価値ある多環化合物に対して,モジュラーで効率的で費用対効果の高いアプローチを提供します.
  • 合成の有用性は,下流の変換によってさらに検証されます.