CENTRO DE INVESTIGACION Y DESARROLLO EN CIENCIAS APLICADAS "DR. JORGE J. RONCO"
Unidad Ejecutora - UE
Solvent-free synthesis of chalcones catalyzed by aminopropylated silica sol-gel
G. ROMANELLI, G. PASQUALE, Á. SATHICQ, H. THOMAS, J. AUTINO, P. VÁZQUEZ
JOURNAL OF MOLECULAR CATALYSIS A-CHEMICAL
ELSEVIER SCIENCE BV
Lugar: Amsterdam; Año: 2011 vol. 340 p. 24 - 24
Aminopropylated nanosilica was prepared by a simple solgel process from tetraethyl orthosilicate(TEOS) and then it was functionalized with different amounts of 3-aminopropyltriethoxysilane (APS)under toluene reflux. The prepared solids were characterized by means of XRD, FT-IR, TGADTA,SEMEDS, and TEM. Their textural properties were determined by adsorptiondesorption isotherms ofN2 at 77 K. It was proved that the amount of APS used in the preparation process had a great influence onthe physicochemical properties of the hybrid organicinorganic solid materials. The materials were usedas catalyst in the ClaisenSchmidt preparation of chalcones for the reaction of substituted acetophenonesand benzaldehydes under solvent-free conditions. The result showed that the presence of a high amountof aminopropyl groups was important for a very good performance of the catalyst in the substrate conversion.Also, the influence of different groups in the aromatic ring of acetophenones and benzaldehydeswas investigated. In all cases, coproduct formation was not observed; the catalysts were recovered andcan be recycled twice without appreciable loss of reactivity.