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関連する概念動画

Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

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.
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

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 catalyst, high molecular...
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

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 species into the...
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
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.

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Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
13:57

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Published on: December 24, 2014

金の表面上の線形アルカンのポリメリゼーション

Dingyong Zhong1, Jörn-Holger Franke, Santhosh Kumar Podiyanachari

  • 1Physikalisches Institut, Universität Münster, Münster, Germany.

Science (New York, N.Y.)
|October 15, 2011
PubMed
まとめ
この要約は機械生成です。

研究者は,選択的な炭素-水素活性化と,長鎖アルケンの炭素-炭素結合を達成しました. この突破は,再構築された黄金の表面を使用して,反応を炭化水素鎖の特定の部位に限定的に導きます.

さらに関連する動画

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
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A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

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Last Updated: May 28, 2026

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes
13:57

Preparation and Friction Force Microscopy Measurements of Immiscible, Opposing Polymer Brushes

Published on: December 24, 2014

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates
08:09

A Technique to Functionalize and Self-assemble Macroscopic Nanoparticle-ligand Monolayer Films onto Template-free Substrates

Published on: May 9, 2014

Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
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Using Polystyrene-block-poly(acrylic acid)-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization

Published on: July 9, 2015

科学分野:

  • 表面化学について
  • カタリシス カタリシス カタリシス
  • オーガニック・シンセシス オーガニック・シンセシス

背景:

  • 飽和炭化水素の選択的機能化は,化学における重要な課題です.
  • 既存の方法は,長鎖アルケンの予測性と効率性が欠けていることが多い.
  • 触媒C-H活性化は,アルカンの機能化のための有望な経路を提供します.

研究 の 目的:

  • 長鎖アルケンの予測可能なC−C結合のための方法を開発する.
  • アルカンの反応性を誘導する表面構造の役割を調査する.
  • 選択的なC-H活性化とデヒドロゲネーティブカップリングを達成するために.

主な方法:

  • アニソトロピックゴールド (((110) 表面を使用し,長鎖アルカン (>C (((20) の吸附とアニリングによりナノメートルサイズのチャネルに再構成されます.
  • 反応を容易にするために,中間温度 (420470 K) を使用します.
  • C-H活性化とC-C結合形成の選択性を分析する.

主要な成果:

  • 再構築された黄金の表面は,1次元チャネル (1.22 nm 幅) を形成し,反応物質の分子を閉じ込めています.
  • この閉じ込めは,末端のCH(3) または前末端のCH(2) グループでのみ高度に選択的なC-H活性化につながる.
  • デヒドロゲン化C-C結合は予想通り起こり,アロマティックな結合よりもアリファティックなC-H結合を好む.

結論:

  • この研究は,選択的なアルカンC-C結合のための新しい表面媒介アプローチを示しています.
  • アニゾトロピックゴールドの表面はテンプレートとして作用し,分子指向と反応部位の選択性を制御します.
  • この方法は,惰性飽和炭化水素の機能化のための予測可能な経路を提供します.