Synthesis of chalcones catalyzed by aminopropylated silica sol–gel under solvent-free conditions
作者： Gustavo Romanelli , Gustavo Pasquale , Ángel Sathicq , Horacio Thomas , Juan Autino
DOI: 10.1016/J.MOLCATA.2011.03.004
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摘要: Abstract Aminopropylated nanosilica was prepared by a simple sol–gel process from tetraethyl orthosilicate (TEOS) and then it functionalized with different amounts of 3-aminopropyltriethoxysilane (APS) under toluene reflux. The solids were characterized means XRD, FT-IR, TGA–DTA, SEM–EDS, TEM. Their textural properties determined adsorption–desorption isotherms N 2 at 77 K. It proved that the amount APS used in preparation had great influence on physicochemical hybrid organic–inorganic solid materials. materials as catalyst Claisen–Schmidt chalcones for reaction substituted acetophenones benzaldehydes solvent-free conditions. result showed presence high aminopropyl groups important very good performance substrate conversion. Also, aromatic ring investigated. In all cases, coproduct formation not observed; catalysts recovered can be recycled twice without appreciable loss reactivity.
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