Abstract

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.

Graphical Abstract