ZnO-nanoparticles: Efficient and reusable heterogeneous catalyst for one-pot,four-component synthesis of 2H-indazolo[2,1-b]phthalazine-triones

Zno nanoparticles as efficient and reusable catalyst for the synthesis of 2hindazolo[ 2,1-b]phthalazine-triones from the one-pot,four-component reaction of arylaldehydes,hydrazine monohydrate,phthalic anhydride,dimedone under solvent-free conditions with short reaction times is described. the zno nanoparticles can be reused several times without significant loss of its catalytic activities.