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関連する概念動画

Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.2K
Olefin Metathesis Polymerization: Overview01:13

Olefin Metathesis Polymerization: Overview

2.1K
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...
2.1K
[4+2] Cycloaddition of Conjugated Dienes: Diels–Alder Reaction01:16

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

10.1K
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.
10.1K
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

2.5K
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...
2.5K
Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation01:28

Reduction of Benzene to Cyclohexane: Catalytic Hydrogenation

4.5K
Unlike the easy catalytic hydrogenation of an alkene double bond, hydrogenation of a benzene double bond under similar reaction conditions does not take place easily. For example, in the reduction of stilbene, the benzene ring remains unaffected while the alkene bond gets reduced. Hydrogenation of an alkene double bond is exothermic and a favorable process. In contrast, to hydrogenate the first unsaturated bond of benzene, an energy input is needed; that is, the process is endothermic. This is...
4.5K
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

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関連する実験動画

Updated: Jun 17, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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異質な触媒を用いた二次元平面に沿ったビニレン結合コヴァレンスの有機フレームワークの制限成長

Yuan-Zhe Cheng1,2, Dong-Hui Yang1, Wenyan Ji1

  • 1CAS Key Laboratory of Nanosystem and Hierarchical Fabrication, CAS Center for Excellence in Nanoscience, National Center for Nanoscience and Technology, Beijing 100190, China.

Journal of the American Chemical Society
|August 6, 2024
PubMed
まとめ
この要約は機械生成です。

異質な触媒であるポリオキシメタレート (POM) は,高結晶2Dビニレン結合の共性有機フレームワーク (viCOF) のスケーラブルな合成を可能にします. この新しい方法は,層の成長を制限し,順序を改善し,高度な材料の準備のための反応時間を短縮します.

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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
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Last Updated: Jun 17, 2025

Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
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Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface

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HKUST-1 as a Heterogeneous Catalyst for the Synthesis of Vanillin
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Synthesis and Characterization of Functionalized Metal-organic Frameworks
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科学分野:

  • 材料科学
  • 化学について
  • ナノテクノロジー

背景:

  • ヴィニレン結合共性有機フレームワーク (viCOF) は通常,同質な触媒を用いて合成される.
  • 均質な触媒はしばしば制御不能な層の成長につながり,高度に秩序付けられたviCOFの形成を妨げます.
  • 既存の方法は,高結晶性とスケーラビリティを達成する上で課題に直面しています.

研究 の 目的:

  • 高度にオーダーされた2D viCOFを合成するためのスケーラブルなプロトコルを開発する.
  • viCOF合成の改善のための異質な触媒の使用を調査する.
  • 異質な触媒でviCOFの成長メカニズムを解明する.

主な方法:

  • ポリオックスメタラート (POM) を異質な触媒として導入する.
  • POMのブロンステッドのアルカリ性と触媒面を利用して2D層の成長を誘導する.
  • 密度関数理論 (DFT) の計算と実験的検証を用いる.

主要な成果:

  • 高結晶性と多孔性の6つの典型的な2D viCOFの合成が成功しました.
  • 2D構造の強化につながった,外平面の分岐の制限を証明した.
  • モノメア組立を促す 底部インターケレーションの 成長パターンを明らかにした
  • 均質な触媒方法と比較して,より短い反応時間を達成した.
  • 2D viCOFのグラムスケール製法が実証された.

結論:

  • POMを使用した異質な触媒は,高品質の2D viCOFを合成するための新しい効果的な戦略を提供します.
  • 開発された方法は,結晶性viCOFへのスケーラブルで効率的な経路を提供します.
  • このアプローチは,共性有機フレームワーク (COF) の合成方法論に関する新しい洞察を提供します.