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All living things are formed mostly of carbon compounds called organic compounds. The category of organic compounds includes both natural and synthetic compounds that contain carbon. Although a single, precise definition has yet to be identified by the chemistry community, most agree that a defining trait of organic molecules is the presence of carbon as the principal element, bonded to hydrogen and other carbon atoms. However, some carbon-containing compounds such as carbonates, cyanides, and...
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Ácidos Lewis poliméricos bien definidos que contienen boro y que contienen boro.

Yang Qin1, Guanglou Cheng, Anand Sundararaman

  • 1Department of Chemistry, Rutgers University-Newark, 73 Warren Street, New Jersey 07102, USA.

Journal of the American Chemical Society
|October 24, 2002
PubMed
Resumen

Los investigadores desarrollaron un nuevo método para crear ácidos de Lewis poliméricos bien definidos utilizando la borilación de polímeros silicilados. Este proceso produce nuevos polímeros que contienen boro con acidez de Lewis ajustable, expandiendo las posibilidades en la química de polímeros.

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Área de la Ciencia:

  • Química de Polímeros La Química de Polímeros es la química de los polímeros.
  • Química del organoborón Química del organoborón
  • Ciencia de los materiales Ciencia de los materiales.

Sus antecedentes:

  • Los ácidos poliméricos de Lewis son materiales valiosos con diversas aplicaciones.
  • El desarrollo de rutas de síntesis controladas para polímeros funcionales sigue siendo un desafío clave.

Objetivo del estudio:

  • Informar sobre una nueva ruta general hacia ácidos Lewis poliméricos bien definidos.
  • Para sintetizar y caracterizar nuevos polímeros que contienen boro.
  • Para explorar la acidez de Lewis sintonizable de estos nuevos materiales poliméricos.

Principales métodos:

  • La polimerización radical por transferencia atómica (ATRP, por sus siglas en inglés) del estireno 4- ((trimethylsilyl) para obtener el poliestireno sililado (PS-Si).
  • La borilación cuantitativa de PS-Si utilizando BBr3 para obtener poli (4-dibromoboril estireno) (PS-B).
  • Reacción del PS-B con los nucleófilos, incluyendo el Cu(C6F5), para generar nuevos ácidos poliméricos de Lewis.

Principales resultados:

  • Se sintetizó poliestireno sililado bien definido (PS-Si) con peso molecular controlado y baja polidispersidad (PDI <1,15).
  • Se preparó con éxito un nuevo ácido de Lewis polimérico soluble que contiene boro, PS-B.
  • PS-B demostró reactividad con los nucleófilos, sirviendo como precursor de polímeros con acidez de Lewis variable.
  • El primer análogo polimérico del tris ((pentafluorofenil) borano, el poli[4-bis ((pentafluorofenil) boril estireno], fue sintetizado.

Conclusiones:

  • Se ha establecido una ruta general y eficiente a ácidos de Lewis poliméricos bien definidos a través de la borilación de polímeros sililados.
  • Los polímeros sintetizados que contienen boro exhiben una acidez de Lewis ajustable, ofreciendo una plataforma para el desarrollo de nuevos materiales.
  • Este trabajo presenta nuevos ácidos poliméricos de Lewis con aplicaciones potenciales en catálisis y ciencia de los materiales.