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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.9K
The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the...
2.9K
[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement01:24

[3,3] Sigmatropic Rearrangement of Allyl Vinyl Ethers: Claisen Rearrangement

2.9K
The Claisen rearrangement is a [3,3] sigmatropic rearrangement of allyl vinyl ethers to unsaturated carbonyl compounds. The rearrangement is a concerted pericyclic reaction proceeding via a chair-like transition state.
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What is an Electrochemical Gradient?01:26

What is an Electrochemical Gradient?

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Adenosine triphosphate, or ATP, is considered the primary energy source in cells. However, energy can also be stored in the electrochemical gradient of an ion across the plasma membrane, which is determined by two factors: its chemical and electrical gradients.
The chemical gradient relies on differences in the abundance of a substance on the outside versus the inside of a cell and flows from areas of high to low ion concentration. In contrast, the electrical gradient revolves around an...
128.7K
Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis02:29

Ethers from Alcohols: Alcohol Dehydration and Williamson Ether Synthesis

13.0K
Overview
Ethers can be prepared from organic compounds by various methods. Some of them are discussed below,
Preparation of Ethers by Alcohol Dehydration
In this method, in the presence of protic acids, alcohol dehydrates to produce alkenes and ethers under different conditions. For example, in the presence of sulphuric acid, dehydration of ethanol at 413 K yields ethoxyethane, whereas it yields ethene at 443 K.
13.0K
Crown Ethers02:36

Crown Ethers

6.1K
Crown ethers are cyclic polyethers that contain multiple oxygen atoms, usually arranged in a regular pattern. The first crown ether was synthesized by Charles Pederson while working at DuPont in 1967. For this work, Pedersen was co-awarded the 1987 Nobel Prize in Chemistry. Crown ethers are named using the formula x-crown-y, where x is the total number of atoms in the ring and y is the number of ether oxygen atoms. The term 'crown' refers to the crown-like shape that these ether molecules...
6.1K
Structure and Nomenclature of Ethers02:28

Structure and Nomenclature of Ethers

14.9K
Structure and Bonding
Ethers are organic compounds with an ether functional group which is characterized by an oxygen atom connected to two — identical or different — alkyl, aryl, or vinyl groups. The C–O–C linkage in dimethyl ether — the simplest ether — has an approximately tetrahedral bond angle of 110.3 degrees. The oxygen atom is sp3- hybridized, with the C–O distance being about 140 pm.
Classification of Ethers
Based on their attached substituent...
14.9K

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Updated: Feb 15, 2026

Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst

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電子化学的に制御されたビニルエーテルのカチオンのポリメリゼーション

Brian M Peterson1, Song Lin1, Brett P Fors1

  • 1Cornell University , Ithaca, New York 14853, United States.

Journal of the American Chemical Society
|February 1, 2018
PubMed
まとめ
この要約は機械生成です。

研究者は電化学を用いてカチオンのポリメリゼーションを一時的に制御することができました. この方法は,ポリマーの成長,分子量,分散を調節し,ブロックコポリマー合成を可能にします.

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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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Electrochemical Impedance Spectroscopy as a Tool for Electrochemical Rate Constant Estimation
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Electrochemical Impedance Spectroscopy as a Tool for Electrochemical Rate Constant Estimation

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Atom Transfer Radical Polymerization of Functionalized Vinyl Monomers Using Perylene as a Visible Light Photocatalyst
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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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Electrochemical Impedance Spectroscopy as a Tool for Electrochemical Rate Constant Estimation
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科学分野:

  • ポリマー化学
  • 電気化学
  • 材料科学

背景:

  • 高度な材料を作るために ポリマーの開始,増殖,終了を 精密に制御することが重要です
  • 放射性ポリメリゼーションでは電気化学的制御が確立されているが,カチオン性ポリメリゼーションでは達成されていない.
  • ポリマー合成のための既存の方法は,しばしば鎖の成長ダイナミクスに対する精密な制御が欠けている.

研究 の 目的:

  • 電気化学技術を用いたカチオンポリメリゼーションの時間的な制御を実現する方法を開発する.
  • ポリマーの分子量と分散を電気化学的手段で調節する能力を実証する.
  • ブロックコポリマーなどの複雑なポリマー構造の合成を制御されたカチオンのポリメリゼーションで可能にする.

主な方法:

  • 電気化学的媒介を用いて,ポリマー鎖の末端を反転的に酸化する.
  • 安定した有機ニトロキシル基を媒介体と連鎖移転剤として使います
  • ポリメリゼーションプロセスを制御するために酸化電流を適用します.

主要な成果:

  • カチオンのポリメリゼーションにおけるポリマー鎖の成長に対する一時的な制御が実証された.
  • ポリマーの分子量と分散を制御する.
  • ブロックコポリマーの合成を容易にする.

結論:

  • カチオンのポリメリゼーションの電気化学的制御は,メディエーター支援の鎖末端酸化によって実現可能である.
  • この技術は制御されたアーキテクチャを持つポリマーの正確な合成のための新しい経路を提供します.
  • ブロックコポリマーを合成する能力は,新しい高度な材料の開発の道を開きます.