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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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

2.5K
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...
2.5K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.0K
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...
2.0K
Conjugate Addition of Enolates: Michael Addition01:08

Conjugate Addition of Enolates: Michael Addition

2.4K
The attack of a nucleophile at the β carbon of an α,β-unsaturated carbonyl compound is called conjugate addition. Conjugate addition reactions of active methylene compounds, such as β-diketones, β-keto esters, β-keto nitriles, and α-nitro ketones, are called Michael addition reactions.
2.4K
Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation01:27

Cyclohexenones via Michael Addition and Aldol Condensation: The Robinson Annulation

2.1K
Robinson annulation is a base-catalyzed reaction for the synthesis of 2-cyclohexenone derivatives from 1,3-dicarbonyl donors (such as cyclic diketones, β-ketoesters, or β-diketones) and α,β-unsaturated carbonyl acceptors. Named after Sir Robert Robinson, who discovered it, this reaction yields a six-membered ring with three new C–C bonds (two σ bonds and one π bond).
2.1K
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

1.9K
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...
1.9K
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

2.3K
Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...
2.3K

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Updated: May 22, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

Published on: December 16, 2022

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アザ・マイケルの添加-断片化-リング開きポリメリゼーション

Dan Huang1,2, Zhen Zhu2, Derong Cao1

  • 1School of Chemistry and Chemical Engineering, State Key Laboratory of Luminescent Materials and Devices, South China University of Technology, Guangzhou 510640, China.

Journal of the American Chemical Society
|May 20, 2025
PubMed
まとめ
この要約は機械生成です。

この研究では,環境条件下で循環性モノマーにおけるC ((sp3) -N結合を分解する新しいリング開封ポリメリゼーション法が導入されています. この新しいアプローチは,制御された性質と予期せぬシスステレオ選択性を有する機能的ポリアミンを得ます.

さらに関連する動画

3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

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関連する実験動画

Last Updated: May 22, 2025

Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers

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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization
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3D Printing and In Situ Surface Modification via Type I Photoinitiated Reversible Addition-Fragmentation Chain Transfer Polymerization

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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

Published on: November 21, 2017

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科学分野:

  • ポリマー化学
  • 有機合成
  • 材料科学

背景:

  • リング開きポリメリゼーション (ROP) のための非張力サイクルモノマーにおける炭素-窒素 (C ((sp3) -N) 結合の割れ方は大きな課題です.
  • 既存の方法は,しばしば厳しい条件を必要とします.または,ストレートされたモノマーに限定されます.

研究 の 目的:

  • ストレスが少ないサイクルモノマーにおけるC ((sp3) -N結合の分裂のための新しい戦略を開発する.
  • 制御されたリング開きポリメリゼーションを実現し,機能的なポリアミンを生成します.
  • ポリメリゼーションのステレオ化学的結果とメカニズムを調査する.

主な方法:

  • チェーン成長ポリメリゼーションメカニズムによるカスケードアザ・マイケル/レトロアザ・マイケル反応の統合.
  • 周囲の条件下で,より低圧サイクルモノマーを使用する.
  • 立体選択性を解明するための密度関数理論 (DFT) の計算.

主要な成果:

  • 張力のないサイクリックモノマーにおけるC ((sp3) -N結合の割れが成功している.
  • 制御された分子量と狭い分散を持つシナマートを含むポリアミンの合成.
  • ポリメリゼーションにおける予想外のシスステレオ選択性の実証.
  • 変換と鎖末端の高精度による線形分子量増加を含む優れたポリメリゼーション制御の証拠.
  • 配列制御されたポリマーの共ポリメリゼーションと合成によって示された多用途.

結論:

  • 開発されたプロトコルは,リング開封ポリメリゼーションのための新しいC-N結合割れ戦略を提供します.
  • この方法は,メインチェーンの機能を持つポリマーへの簡単な合成経路を提供します.
  • この発見は,高度なポリマーアーキテクチャの設計と合成のための新しい道を開きます.