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Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.2K
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...
2.2K
Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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

2.6K
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...
2.6K
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
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

7.9K
The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
7.9K
Preparation of Alkynes: Alkylation Reaction02:27

Preparation of Alkynes: Alkylation Reaction

10.2K
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.
10.2K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.6K
The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this...
2.6K

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関連する実験動画

Updated: Jul 14, 2025

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

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リングの膨張 アルキンメタテシス ポリマー化

Andrew M Beauchamp1, Jhonti Chakraborty1, Ion Ghiviriga2

  • 1Department of Chemistry, Center for Catalysis, University of Florida, Gainesville, Florida 32611, United States.

Journal of the American Chemical Society
|October 9, 2023
PubMed
まとめ
この要約は機械生成です。

研究者らは,リング膨張アルキンメタテシスポリメリゼーション (REAMP) を可能にする新しい結合アルキリジン・ボルンガム複合体について報告している. この新しい触媒は,高度な特徴化技術によって確認された,ストレートされたサイクロアルキンからサイクルポリマーを成功裏に合成した.

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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

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Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization
12:19

Photogeneration of N-Heterocyclic Carbenes: Application in Photoinduced Ring-Opening Metathesis Polymerization

Published on: November 29, 2018

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Depolymerizable Olefinic Polymers Based on Fused-Ring Cyclooctene Monomers
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization
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Ethylene Polymerizations Using Parallel Pressure Reactors and a Kinetic Analysis of Chain Transfer Polymerization

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科学分野:

  • 有機金属化学
  • ポリマー化学
  • カタリシス

背景:

  • トングステンアルキリジンの複合体はアルキンの転化において重要な触媒である.
  • 環膨張アルキンメタテシスポリメリゼーション (REAMP) はサイクルポリマーへの経路を提供します.
  • 新しい触媒の開発は,ポリメリゼーション技術の進歩に不可欠です.

研究 の 目的:

  • 新しい結合型アルキリジネートングステンの複合体を合成し,特徴づけること.
  • 環膨張アルキンメタテシスポリメリゼーション (REAMP) での複合体の活動を調査する.
  • この新しい触媒システムを用いてサイクルポリマーの合成を実証する.

主な方法:

  • 前駆体6とプロリガンド5から結合したアルキリジンボルンガム複合体7の合成
  • 核磁共振 (NMR) スペクトロスコーピーと核オーバーハウザー効果 (NOE) スペクトロスコーピーを用いた特徴付け.
  • 圧縮されたサイクロアルキン8のポリメリゼーションに続いて,サイズ排除染色体 (SEC) と固有粘度 (η) の測定を行います.

主要な成果:

  • 二次結合したアルキリジン・ボルンガム複合体 (7) が成功して合成され,特徴づけられた.
  • コンプレックス7は,ストレントサイクロアルキンのポリメリゼーションを触媒化する活性を示した (8).
  • 結果的に得られたポリマーは,SECと粘度測定によって確認された周期的なトポロジーを示した.

結論:

  • REAMPのために新しい結合アルキリジンのボルンガム複合体が開発されました.
  • この触媒システムは,圧縮されたサイクロアルキンからサイクルポリマーを生成するのに有効です.
  • この発見はサイクルポリマー構造を 合成するための新しい道を開きます