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関連する概念動画

Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...
Radical Anti-Markovnikov Addition to Alkenes: Overview01:25

Radical Anti-Markovnikov Addition to Alkenes: Overview

The addition of hydrogen bromide to alkenes in the presence of hydroperoxides or peroxides proceeds via an anti-Markovnikov pathway and yields alkyl bromides.
Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

Introduction
Alkylation of terminal alkynes with primary alkyl halides in the presence of a strong base like sodium amide is one of the common methods for the synthesis of longer carbon-chain alkynes. For example, treatment of 1-propyne with sodium amide followed by reaction with ethyl bromide yields 2-pentyne.
Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation02:24

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

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.

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関連する実験動画

Updated: May 27, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
09:45

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

1段階アルキンメタテシスによって構築された,高度に選択的なC70形状持続的長方形のプリズムです.

Chenxi Zhang1, Qi Wang, Hai Long

  • 1Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309, USA.

Journal of the American Chemical Society
|November 17, 2011
PubMed
まとめ

研究者らは,ダイナミック・コヴァレント・ケミストリー (DCC) とアルキン・メタテシスを用いた新しい3D分子ケージ,COP-5を開発した. このケージはフルレンを効率的に結合・分離し,C70に対してC60に対して高い親和性と選択性を示しています.

さらに関連する動画

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
09:35

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

関連する実験動画

Last Updated: May 27, 2026

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene
09:45

Accessing Valuable Ligand Supports for Transition Metals: A Modified, Intermediate Scale Preparation of 1,2,3,4,5-Pentamethylcyclopentadiene

Published on: March 20, 2017

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units
09:35

Preparation of a Corannulene-functionalized Hexahelicene by Copper(I)-catalyzed Alkyne-azide Cycloaddition of Nonplanar Polyaromatic Units

Published on: September 18, 2016

科学分野:

  • 超分子化学 超分子化学
  • オーガニック・シンセシス オーガニック・シンセシス
  • マテリアルサイエンス 材料科学

背景:

  • ダイナミック・コヴァレンント・ケミストリー (DCC) は効率的な分子構造を提供するが,複雑な3Dアーキテクチャのための方法は限られている.
  • 複雑な分子ケージを作成するための堅牢な方法の開発は,高度なアプリケーションにとって不可欠です.

研究 の 目的:

  • 新しい3D分子ケージの1段階合成のために,DCCのアプローチであるアルキンメタテーシスを利用する.
  • 合成されたケージのフルレンの結合特性を調査し,近親性,選択性,および可逆性に焦点を当てました.

主な方法:

  • アルキンメタテシスを用いた3次元直角プリズマ分子ケージCOP-5の1段階合成.
  • COP-5の構造と形状固有の性質の特徴.
  • C60およびC70フルレンの結合定数と選択性を決定するスペクトル解析.

主要な成果:

  • ポルフィリンベースの前駆体から新しい3DケージCOP-5の1段階合成が成功しました.
  • COP-5はC60 (1.4 × 10^5 M^-1) とC70 (1.5 × 10^8 M^-1) に対して高い結合親和性を示しています.
  • COP-5は,C70に対してC60 (K(C70) /K(C60) >1000) よりもC70の例外的な選択性と,酸塩刺激下での可逆結合を示しています.

結論:

  • アルキンメタテシスは,COP-5のような複雑な3D分子ケージを構築するための強力なDCC戦略です.
  • COP-5は,前例のないC70選択性を持つフルレレンに対する非常に効果的な純粋な有機受容体です.
  • リバーシブル結合により,C70をフルレン混合物から分離することができ,実用的な応用の可能性を示しています.