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Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

5.1K
Imine formation involves the addition of carbonyl compounds to a primary amine. It begins with the generation of carbinolamine through a series of steps involving an initial nucleophilic attack and then several proton transfer reactions. The second part includes the elimination of water, as a leaving group, to give the imine.
Imines are formed under mildly acidic conditions. A pH of 4.5 is ideal for the reaction.
If the pH is low or the solution is too acidic, the reaction slows down in the...
5.1K
Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

4.3K
Primary amines react with carbonyl compounds—aldehydes and ketones—to generate imines. Imines consist of a C=N double bond and are named Schiff bases after its discoverer—the German chemist Hugo Schiff. On the other hand, secondary amines react with carbonyl compounds to give enamines. In enamines, the presence of a C=C double bond adjacent to the nitrogen atom leads to the delocalization of the lone pair.
4.3K
Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

2.0K
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,...
2.0K
Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.0K
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...
2.0K
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
Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.2K
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...
2.2K

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関連する実験動画

Updated: May 21, 2025

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

7.1K

イミン基の一時性超分子ポリマー

Gabriele Melchiorre1, Lucia Visieri2, Matteo Valentini1

  • 1Dipartimento di Chimica and Istituto CNR per i Sistemi Biologici (ISB-CNR), Sede Secondaria di Roma─Meccanismi di Reazione, c/o Dipartimento di Chimica, Università di Roma "La Sapienza", P.le A. Moro, 5, Rome I-00185, Italy.

Journal of the American Chemical Society
|March 19, 2025
PubMed
まとめ
この要約は機械生成です。

研究者は,ダイナミック・コンビネトリアル・ライブラリ (DCL) 内のコンポーネントをリサイクルすることで,一時的な超分子ポリマーを作成する新しい方法を開発しました. このアプローチでは 燃料の分散により 協和状態と 超分子状態を切り替えて 生命体を模倣します

さらに関連する動画

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

Published on: February 7, 2017

7.8K
Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

18.5K

関連する実験動画

Last Updated: May 21, 2025

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly
09:34

Synthesis of Information-bearing Peptoids and their Sequence-directed Dynamic Covalent Self-assembly

Published on: February 6, 2020

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

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科学分野:

  • 超分子化学
  • ダイナミック・コバルント・ケミストリー
  • 化学システム

背景:

  • 化学的刺激に反応する 超分子システムは 生物学的機能を真似ることができます
  • 多くのシステムは,一時的な自己組み立てと分解のために化学燃料の分散に依存しています.
  • 以前の方法は,ポリメリゼーションのための休眠種を活性化するために,コンポーネントを追加または削除する必要がありました.

研究 の 目的:

  • 暫定的な超分子ポリメリゼーションを誘発するための新しいアプローチを提示する.
  • ダイナミック・コバルント化学と 超分子化学を組み合わせて 部品のリサイクルを行う
  • 分子を超えたポリマーを 消散型ダイナミック・コンビネトリアル・ライブラリから作る

主な方法:

  • イミンとアミンのバランスのとれたダイナミックコンビネトリアルライブラリ (DCL) を利用する.
  • DCLを一時的な酸性状態で活性炭酸 (ACA) で処理する.
  • 超分子組立のためのプロトン化アミンとクラウンエーテル分子の間の相互作用を使用します.

主要な成果:

  • 化学的接続をシャッフルして 消耗性DCLを生成した
  • 超分子ポリメリゼーションを成功させました
  • カリックス[4]アレンおよびイソフタルアルデヒド由来原料で戦略を実証した.
  • 超分子ポリマーに 臨時変換を証明した

結論:

  • この方法は燃料駆動部品のリサイクルを通じて 超分子組成を制御する新しい方法を提供します
  • このアプローチは,共性状態と超分子ポリマー状態のダイナミックな切り替えを可能にします.
  • この研究は 反応性・適応性のある化学システムの設計に関する洞察を提供します