Nano-TiO<sub>2</sub>as an Efficient Catalyst for Tandem Knoevenagel-Michael-Cyclocondensation Reaction of Dimedone with Aromatic Aldehydes and Ammonium Acetate or Aromatic Amines under Solvent-free Conditions
and successfully applied as an efficient and heterogeneous catalyst in the synthesis of 1,8‐dioxo‐decahydroacridines via the one‐pot multi‐component condensation reaction of dimedone with aromaticaldehydes and ammoniumacetate or aromatic amines under mild and solvent‐free conditions.