Nano Titanium Dioxide: Efficient and Reusable Heterogeneous Nano Catalyst for Synthesis of 1,8-Dioxo-Decahydroacridines

3,3,6,6-Tetramethyl-9-phenyl-3,4,6,7,9,10-hexahydroacridine-1,8-(2H,5H)-dione derivatives are synthesized by nano titanium dioxide as an efficient and reusable heterogeneous nano catalyst in a one pot multi component reaction. Easy preparation and separation of catalyst, simply workup procedure, clean reaction and reusability of the catalyst up to 7 times without appreciable loss of its catalytic activity and high yields are some advantages of this work.