Hydrothermal Synthesis of In2O3-SiO2 as Recyclable Mesostructured Catalyst Utilized for 2,3-Dihydrophthalazine-1,4-dione (DHP) Derivatives

Mesostructured In2O3-SiO2 as recyclable heterogeneous catalyst material was synthesized by an aqueous solution based wet chemistry method, i.e. hydrothermal method and utilized for the reaction between pathalic anhydride and substituted hydrazine hydrate in DMF medium to synthesize 2,3-dihydrophthalazine-1,4-dione (DHP) derivatives. The advantages of this protocol are cost effective, ease of handling and environmental friendly. This catalytic material were characterized by using X-ray diffraction spectroscopy, scanning electron microscopy, energy dispersive spectroscopy, Fourier transform infrared spectroscopy, temperature-programmed desorption and Brunauer–Emmett–Teller. The proposed synthetic method results in a high yield, has an easy work-up procedure, is non-toxic and clean, and facilitates the simple recovery and reusability of the catalytic system.