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Difuncionalización de alqueno catalizado por níquel como método para la polimerización

Julia N Katzbaer¹, Vincent M Torres¹, Elizabeth Elacqua¹

¹Department of Chemistry, The Pennsylvania State University, University Park, Pennsylvania 16802, United States.

Journal of the American Chemical Society

|June 21, 2023

Resumen

Este resumen es generado por máquina.

Este estudio introduce una nueva difuncionalización de alqueno catalizado por níquel para la síntesis de polímeros, creando poli[arileno-α-arilo]etileno únicos con intervalos regulares de grupos arilo y alta estabilidad térmica.

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Área de la Ciencia:

Química de los polímeros
Síntesis orgánica
Ciencias de los materiales

Sus antecedentes:

La difuncionalización de alceno es una herramienta sintética clave para crear moléculas complejas.
Su aplicación en la síntesis de polímeros, en particular para polímeros estereodefinidos, permaneció inexplorada.
El desarrollo de nuevos métodos de polimerización es crucial para los materiales avanzados.

Objetivo del estudio:

Informar el primer ejemplo de difuncionalización de alceno catalizado por níquel para la síntesis de polímeros.
Investigar la regioselectividad y las características de los polímeros resultantes.
Explorar el potencial de este método para la creación de nuevos polietileno-alfaetileno.

Principales métodos:

Difuncionalización catalizada por níquel de alquenos utilizando ésteres arilborónicos y bromuros de arilo.
La polimerización regioselectiva con adición específica a través del alqueno.
Fraccionamiento para aislar polímeros de las especies oligoméricas.
Análisis térmico (TGA, DSC) para determinar las propiedades del polímero.

Principales resultados:

Síntesis exitosa de poli[arileno-alfa-arilo]etileno a través de una nueva polimerización de difuncionalización catalizada por Ni.
Adición regioselectiva de bromuro de arilo al carbono terminal y de éster arilborónico al carbono bencílico interno.
Se obtienen polímeros con pesos moleculares comprendidos entre 30 y 175 kDa.
Los polímeros exhiben una alta estabilidad térmica (hasta ~ 399 °C) y una temperatura de transición de vidrio (Tg) de 90 °C.

Conclusiones:

Este trabajo establece una nueva ruta para la síntesis de poli[arileno-alfa-aril]etileno a través de la difuncionalización de alquenos.
Los polímeros resultantes poseen propiedades térmicas deseables comparables a los polímeros establecidos como el poliestireno.
Este método abre caminos para la ingeniería de polímeros avanzados con propiedades a medida.