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Videos de Conceptos Relacionados

Aldehydes and Ketones with Amines: Imine Formation Mechanism01:23

Aldehydes and Ketones with Amines: Imine Formation Mechanism

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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...
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Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview01:16

Aldehydes and Ketones with Amines: Imine and Enamine Formation Overview

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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.
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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...
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Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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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...
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Polímeros supramoleculares transitorios basados en iminas

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
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo método para crear polímeros supramoleculares temporales mediante el reciclaje de componentes dentro de una biblioteca combinatoria dinámica (DCL). Este enfoque utiliza la disipación de combustible para cambiar entre estados covalentes y supramoleculares, imitando a los sistemas vivos.

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Área de la Ciencia:

  • Química supramolecular
  • Química Covalente Dinámica
  • Sistemas químicos

Sus antecedentes:

  • Los sistemas supramoleculares que responden a estímulos químicos pueden imitar las funciones biológicas.
  • Muchos sistemas se basan en la disipación de combustible químico para el autoensamblaje y desmontaje transitorios.
  • Los métodos anteriores requerían agregar o eliminar componentes para activar especies latentes para la polimerización.

Objetivo del estudio:

  • Presentar un nuevo enfoque para desencadenar polimerizaciones supramoleculares transitorias.
  • Combinar la química covalente dinámica y la química supramolecular para el reciclaje de componentes.
  • Para crear polímeros supramoleculares desde una biblioteca combinatoria dinámica disipacional.

Principales métodos:

  • Utilizando una biblioteca combinatoria dinámica equilibrada (DCL) de iminas y aminas.
  • Tratamiento de la DCL con un ácido carboxílico activado (ACA) en condiciones ácidas transitorias.
  • Utilizando interacciones entre aminas protonadas y fracciones de éter de corona para el ensamblaje supramolecular.

Principales resultados:

  • Generó una DCL disipadora por mezclar la conectividad química.
  • Se ha activado con éxito una polimerización supramolecular transitoria.
  • Demostró la estrategia con calix[4]areno y materias primas derivadas de isoftalaldehído.
  • Mostró la transformación temporal de sistemas covalentes en polímeros supramoleculares.

Conclusiones:

  • Este método ofrece una nueva forma de controlar el ensamblaje supramolecular a través del reciclaje de componentes impulsados por combustible.
  • El enfoque permite el cambio dinámico entre los estados poliméricos covalentes y supramoleculares.
  • Este trabajo proporciona información sobre el diseño de sistemas químicos sensibles y adaptables.