CINDECA   05422
CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
artículos
Título:
.- Wells-Dawson heteropolyacid as reusable catalyst for sustainable synthesis of flavones
Autor/es:
D. O BENNARDI; G.P ROMANELLI, A.G. SATHICQ; J. C AUTINO, G. T. BARONETTI, HORACIO J THOMAS.
Revista:
APPLIED CATALYSIS A-GENERAL
Editorial:
ELSEVIER SCIENCE BV
Referencias:
Lugar: Amsterdam; Año: 2011 vol. 404 p. 68 - 73
ISSN:
0926-860X
Resumen:
The behavior of WellsDawson (H6P2W18O62·24H2O, WD) acid, both bulk and supported on silica, for the
cyclodehydration reaction of 1-(2-hydroxyphenyl)-3-phenyl-1,3-propanedione to obtain flavone was
studied in heterogeneous conditions, using toluene as solvent. Catalytic experiences with bulk and supported
catalysts with different WD acid loadings and reuse of the catalysts were done. The catalytic
activity of supported catalysts was higher than that of the bulk catalyst, and their activity was almost
constant after three reaction cycles. The following reaction conditions: reflux toluene and 1% mmol of
WD supported on silica (0.4 g WD acid by gram of silica) were used for the preparation of five flavones.
Yields above 85% were obtained in 45 h.6P2W18O62·24H2O, WD) acid, both bulk and supported on silica, for the
cyclodehydration reaction of 1-(2-hydroxyphenyl)-3-phenyl-1,3-propanedione to obtain flavone was
studied in heterogeneous conditions, using toluene as solvent. Catalytic experiences with bulk and supported
catalysts with different WD acid loadings and reuse of the catalysts were done. The catalytic
activity of supported catalysts was higher than that of the bulk catalyst, and their activity was almost
constant after three reaction cycles. The following reaction conditions: reflux toluene and 1% mmol of
WD supported on silica (0.4 g WD acid by gram of silica) were used for the preparation of five flavones.
Yields above 85% were obtained in 45 h.
© 2011 Elsevier B.V. All rights reserved.