Gallium-containing polymer brush film as efficient supported Lewis acid catalyst in a glass microreactor.
Beilstein J Org Chem
; 9: 1698-704, 2013.
Article
em En
| MEDLINE
| ID: mdl-24062830
ABSTRACT
Polystyrene sulfonate polymer brushes, grown on the interior of the microchannels in a microreactor, have been used for the anchoring of gallium as a Lewis acid catalyst. Initially, gallium-containing polymer brushes were grown on a flat silicon oxide surface and were characterized by FTIR, ellipsometry, and X-ray photoelectron spectroscopy (XPS). XPS revealed the presence of one gallium per 2-3 styrene sulfonate groups of the polymer brushes. The catalytic activity of the Lewis acid-functionalized brushes in a microreactor was demonstrated for the dehydration of oximes, using cinnamaldehyde oxime as a model substrate, and for the formation of oxazoles by ring closure of ortho-hydroxy oximes. The catalytic activity of the microreactor could be maintained by periodic reactivation by treatment with GaCl3.
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Coleções:
01-internacional
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MEDLINE
Idioma:
En
Ano de publicação:
2013
Tipo de documento:
Article