Bentonite-titana composite was prepared and characterized by XRD, FT-IR and SEM. Results indicate that
TiO2 particles have been supported on the bentonite layers and a delaminated structure is formed. Then the bentonitetitana
composite as a mild, eco-friendly, non-toxic an efficient heterogeneous catalyst have been used for synthesis of
benzopyran derivatives from the three-component condensation reaction of dimedone or barbituric acid, malonoitrile, and
aromatic aldehydes under solvent free conditions in good to excellent yield and short reaction times.
Keywords: Bentonite-titana composite, benzopyran, dimedone, malonoitrile, barbituric acid, pyrano[2, 3-d]pyrimidine.
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