info:eu-repo/semantics/article
Trifluoromethanesulfonic acid supported on carbon used as catalysts in the synthesis of flavones and chromones
Fecha
2009-01Registro en:
Bennardi, Daniel Oscar; Romanelli, Gustavo Pablo; Autino, Juan Carlos; Pizzio, Luis Rene; Trifluoromethanesulfonic acid supported on carbon used as catalysts in the synthesis of flavones and chromones; Elsevier Science; Catalysis Communications; 10; 5; 1-2009; 576-581
1566-7367
CONICET Digital
CONICET
Autor
Bennardi, Daniel Oscar
Romanelli, Gustavo Pablo
Autino, Juan Carlos
Pizzio, Luis Rene
Resumen
Solid acid catalysts based on trifluoromethanesulfonic acid (TFMS) were synthesized using two different activated carbons as supports. They were characterized by FT-IR, DTA-TGA and BET, and their acidity was measured by potentiometric titration with n-butylamine. The new catalysts were checked for the cyclization of 1-(2-hydroxyphenyl)-3-phenyl-1,3-propanedione. The reaction experiments were performed using toluene as the solvent, at reflux. In all cases the product (flavone) was obtained with high selectivity. Conversions up to 84% were obtained using the supported catalyst TFMSC2. The activity of the catalysts is strongly dependent on the textural properties of the support used to obtain them, particularly their mean pore size. Optimal reaction conditions were applied to the preparation of seven substituted flavones and chromones. © 2008 Elsevier B.V. All rights reserved.