Catalytic activity of Keggin heteropolycompounds in the Pechmann reaction
- Torviso, Maria del Rosario
- Mansilla, Daniela Soledad
- Belizán, A.
- Alesso, E.
- Moltrasio, Graciela Yolanda
- Vazquez, Patricia Graciela
- Pizzio, Luis Rene
- Blanco, Mirta Noemi
- Caceres, Carmen Victoria
DOIAbstract
Different heteropolycompounds were used as catalysts in the synthesis of coumarins from phenols and ethyl acetoacetate. The H3PMo12O40 and H3PW12O40 Keggin heteropolyacids were supported on different types of silica. On the other hand, the aluminium salts of these heteropolyacids and that of the H4SiW12O40 acid were prepared. The specific surface area (SBET), and the mean pore diameter of the obtained catalysts were estimated from the adsorption isotherms of nitrogen at 77 K. Their Fourier transform infrared spectra were recorded and their acidity was determined by potentiometric titration with a solution of n-butylamine in acetonitrile. The catalytic activity using several phenols such as resorcinol, 3,5-dimethoxyphenol, a-naphtol and b-n...
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