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A simple, efficient and environmentally benign protocol has been developed for the synthesis of substituted benzo[4,5]imidazo[1,2-a]chromeno[4,3-d]pyrimidin-6-one by a reaction of 4-hydroxycoumarin, aldehydes and 2-aminobenzimidazole using silane@TiO2 nanoparticles as heterogeneous catalyst under reflux condition in ethanol. The surface modification of TiO2 nanoparticles was confirmed by using FT-IR,...
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