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Videos de Conceptos Relacionados

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Acid-Catalyzed Ring-Opening of Epoxides02:24

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Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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,...
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Base-Catalyzed Ring-Opening of Epoxides02:26

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Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...
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Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)01:16

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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...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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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Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes
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El catalizador de intercambio iónico combina la polimerización de apertura de anillo catiónico con los iniciadores de

Tingwei Chen1, Chenke Zhao1, Junpeng Zhao1,2

  • 1Faculty of Materials Science and Engineering, South China University of Technology, Guangzhou 510640, China.

Journal of the American Chemical Society
|September 4, 2025
PubMed
Resumen

Los ácidos carboxílicos ahora pueden iniciar la polimerización de apertura de anillos catiónicos para polímeros funcionales utilizando un nuevo sistema de catalizador. Este avance permite la síntesis controlada de polímeros con las funcionalidades deseadas del grupo final.

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Área de la Ciencia:

  • Química de los polímeros
  • Ingeniería macromolecular
  • Síntesis orgánica

Sus antecedentes:

  • Los iniciadores de polimerización catiónica convencionales (ácidos fuertes/electrófilos) carecen de compatibilidad de grupo funcional.
  • Los ácidos carboxílicos son tolerantes al grupo funcional pero históricamente incapaces de iniciar la polimerización catiónica.
  • La síntesis en un solo paso de polímeros funcionalizados finales sigue siendo un desafío.

Objetivo del estudio:

  • Desarrollar un nuevo método para la polimerización por apertura de anillos catiónicos iniciada por ácido carboxílico (CROP).
  • Permitir la síntesis en un solo paso de polímeros funcionalizados con arquitecturas controladas.
  • Explorar el mecanismo y el alcance de esta nueva técnica de polimerización.

Principales métodos:

  • CROP iniciado por el ácido carboxílico de 2-etil-2-oxazolina (EtOx) utilizando como catalizador el litio bis (trifluorometanesulfonil) imida (LiTFSI).
  • Investigación del papel de la interacción Li+-carboxilato y la dinámica del intercambio aniónico.
  • Exploración de los efectos del disolvente (γ-valerolactona) en la polimerización.
  • Caracterización de las propiedades del polímero, incluida la masa molar, la dispersión y la fidelidad del grupo final.
  • Estudios computacionales para elucidar los mecanismos de reacción.

Principales resultados:

  • Iniciación exitosa de EtOx CROP por ácidos carboxílicos, habilitada por el catalizador LiTFSI.
  • Control demostrado sobre la masa molar, baja dispersión y alta fidelidad del grupo final.
  • La velocidad de polimerización está influenciada por la estructura del iniciador y el disolvente.
  • Se obtiene poliEtOx funcional con propiedades como la resistencia a las proteínas y la emisión inducida por agregación.

Conclusiones:

  • Se ha establecido un nuevo paradigma catalítico para el CROP iniciado por ácido débil.
  • Este método supera las limitaciones de los iniciadores tradicionales, expandiendo las capacidades de síntesis de polímeros.
  • La técnica desarrollada ofrece una plataforma versátil para la ingeniería macromolecular y la creación de materiales funcionales.