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A novel, facial, highly effective gallium oxide (Ga 2 O 3 ) nanocatalyst was synthesized and characterized by FT-IR, X-ray diffraction pattern (XRD), Scanning electron microscope (SEM), and Energy-dispersive X-ray spectroscopy (EDAX) analysis. The resulting gallium oxide (Ga 2 O 3 ) nanomaterial has been successfully used as a catalyst for condensation of various aldehydes, dimedone, ammonium acetate, and ethyl acetoacetate under ethanol condition to yield polyhydroquinoline derivatives via a one-pot four-component Hantzsch condensation reaction. The products were investigated by IR, NMR, and mass spectral techniques. The desired catalyst was recycled and reused without any considerable changes in the yield.

Gallium Oxide (Ga 2 O 3 ): An Efficient Heterogeneous Nanocatalyst for One Pot, Multi-Component Synthesis of Polyhydroquinolines