Video Experimental Relacionado

Updated: Oct 14, 2025

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

Published on: November 21, 2017

Polimerización por hidrosilación libre de metales mediante la fusión de fotorreducción y catálisis de transferencia

Zhujun Huang¹, Zhe Chen¹, Yuan Jiang¹

¹State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai 200438, China.

Journal of the American Chemical Society

|November 5, 2021

Resumen

Este estudio introduce la polimerización de hidrosilación sin metales utilizando luz visible, fotocatalizadores orgánicos y catalizadores de transferencia de átomos de hidrógeno (HAT). Este método permite la síntesis controlada de diversos policarbosilanos a partir de varios dienos y bisilanos.

Área de la Ciencia:

Química de los polímeros
Química del silicio orgánico
Fotocatálisis

Sus antecedentes:

Los compuestos orgánicos de silicio y los polímeros son bloques de construcción sintéticos vitales y materiales funcionales.
La hidrosilación es una estrategia clave para sintetizar compuestos y polímeros de organosilicio.
La polimerización por hidrosilación libre de metales, en particular para diversos dienos, sigue estando poco desarrollada.

Objetivo del estudio:

Desarrollar un método de polimerización de hidrosilación sin metales impulsado por la luz visible.
Para permitir la polimerización de dienos ricos en electrones y deficientes en electrones con bisilano.
Para lograr una síntesis controlada de policarbosilanos con arquitecturas ajustables.

Principales métodos:

Se utilizó luz visible, un fotocatalizador orgánico (4CzIPN) y un reactivo de transferencia de átomos de hidrógeno (HAT).
Se utiliza la activación selectiva del enlace Si-H para la polimerización de crecimiento escalonado controlado de dienos ricos en electrones.
Se ha conseguido la hidrosilación y la auto-polimerización simultáneas para dienos con déficit de electrones mediante el ajuste de las relaciones de reactivo.

Principales resultados:

Se han sintetizado con éxito policarbosilanos bien controlados a partir de dienos y bisilanos ricos en electrones.
Arquitecturas de polímeros sintonizables habilitadas (lineal, hiper ramificado, red) para dienes con déficit de electrones.
Produjo policarbosilanos con alto peso molecular, excelente estabilidad térmica y diversas estructuras.

Conclusiones:

Se ha establecido una estrategia versátil de polimerización por hidrosilación impulsada por luz visible y sin metales.
El método ofrece un control preciso de la arquitectura del polímero mediante la selección de dienes y catalizadores apropiados.
Este enfoque amplía el alcance de la síntesis de polímeros orgánicos de silicio para aplicaciones de materiales avanzados.

Más Videos Relacionados

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

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

Published on: April 22, 2016

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

Published on: June 8, 2016

Videos de Conceptos Relacionados

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...

Reduction of Alkenes: Catalytic Hydrogenation

Reduction of Alkenes: Catalytic Hydrogenation

Alkenes undergo reduction by the addition of molecular hydrogen to give alkanes. Because the process generally occurs in the presence of a transition-metal catalyst, the reaction is called catalytic hydrogenation.
Metals like palladium, platinum, and nickel are commonly used in their solid forms — fine powder on an inert surface. As these catalysts remain insoluble in the reaction mixture, they are referred to as heterogeneous catalysts.
The hydrogenation process takes place on the...

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Reduction of Alkynes to cis-Alkenes: Catalytic Hydrogenation

Introduction
Like alkenes, alkynes can be reduced to alkanes in the presence of transition metal catalysts such as Pt, Pd, or Ni. The reaction involves two sequential syn additions of hydrogen via a cis-alkene intermediate.

Olefin Metathesis Polymerization: Overview

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists...

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.

Free-Radical Chain Reaction and Polymerization of Alkenes

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.