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Ferrocenilhidridoboratos: síntesis, caracterización estructural y aplicación para la preparación de polímeros de
Matthias Scheibitz1, Haiyan Li, Jan Schnorr
1Institut für Anorganische und Analytische Chemie, Johann Wolfgang Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt am Main, Germany.
Journal of the American Chemical Society
|October 20, 2009
Resumen
Se sintetizaron y caracterizaron nuevos polímeros de ferrocenilborano. Estos nuevos materiales exhiben propiedades únicas, incluida la absorción de rayos UV con desplazamiento al rojo en comparación con las moléculas más pequeñas, lo que indica posibles aplicaciones en la ciencia de los materiales.
Área de la Ciencia:
- Química organometálica Química orgánica de los metales.
- Química de Polímeros La Química de Polímeros es la química de los polímeros.
- Ciencia de los materiales Ciencia de los materiales.
Sus antecedentes:
- Los derivados del ferroceno son versátiles bloques de construcción en la química organometálica.
- Los compuestos de boro ofrecen una reactividad y diversidad estructural únicas.
- El desarrollo de nuevos materiales poliméricos con propiedades electrónicas personalizadas es de gran interés.
Objetivo del estudio:
- Para sintetizar y caracterizar nuevos mono y ditópicos litio ferrocenilhidridoborato.
- Para investigar la reactividad de estos boratos y sus correspondientes boranos.
- Desarrollar nuevos polímeros de ferrocenilborano y estudiar sus propiedades.
Principales métodos:
- Síntesis de ferrocenilhidridoboratos de litio utilizando precursores de ferrocenilborón y hidruro de litio y aluminio.
- Cristalografía de rayos X para la determinación estructural de agregados.
- Reacción de los boratos con el cloruro de trimetilsililo para generar boranos.
- La polimerización y caracterización de los polímeros de ferrocenilborano mediante la RMN, IR, UV-vis, y la espectrometría de masas MALDI-TOF.
Principales resultados:
- Síntesis exitosa de mono- y ditópicos litio ferrocenilhidridoboratos, formando agregados diméricos y tetrámeros.
- Generación de ferrocenilboranos y su posterior condensación para formar polímeros de ferrocenilborano.
- Síntesis de nuevos polímeros de ferrocenilborano que contienen grupos vinílicos unidos al boro, que muestran un desplazamiento al rojo de la absorción UV.
Conclusiones:
- El estudio demuestra una ruta fácil a los nuevos polímeros de ferrocenilborano.
- Los polímeros sintetizados poseen propiedades electrónicas únicas debido a su conjugación extendida.
- Estos hallazgos abren caminos para el desarrollo de nuevos polímeros organometálicos funcionales.
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One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
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The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
The acid-catalyzed addition of water to the double bond of alkenes is a large-scale industrial method used to synthesize low-molecular-weight alcohols. An acidic atmosphere is required to allow the hydrogen in the water molecule to act as an electrophile and attack the double bond in an alkene. The addition of a proton to the double bond creates a carbocation intermediate. The proton preferentially bonds to the less substituted end of the double bond to create a more stable carbocation...
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Removing one hydrogen from the intervening CH2 group with both...
Removing one hydrogen from the intervening CH2 group with both...