@article{Mirjalili_Keihanfar_2024, title={Nano-SiO2/hexamethylenetetramine promoted synthesis of pyrano[2,3-c] pyrazoles under solvent-free conditions}, volume={10}, url={https://oiccpress.com/iranian-journal-of-catalysis/article/nano-sio2-hexamethylenetetramine-promoted-synthesis-of-pyrano23-c-pyrazoles-under-solvent-free-conditions/}, abstractNote={In this study, the nano-SiO2/hexamethylenetetramine as a new basic heterogeneous nanocatalyst was prepared and used for the synthesis of pyranopyrazole via the four-component reaction. Various aldehydes, hydrazine hydrate, ethyl acetoacetate and malononitrile were reacted at room temperature under solvent-free and grinding conditions. The morphology and structure of nano-catalyst were investigated by techniques such as FT-IR spectroscopy, FESEM, TEM, XRD, CHNS elemental analyzer and TGA. The structure of pyranopyrazoles was determined by spectroscopic data of FTIR and NMR. The principal affairs of this procedure are easy work-up, high yields, mild conditions and short reaction times.}, number={1}, journal={Iranian Journal of Catalysis}, publisher={OICC Press}, author={Mirjalili, Bi Bi Fatemeh and Keihanfar, Mina}, year={2024}, month={Feb.}, keywords={Multicomponent reactions, Basic nanocatalyst, Pyrano[2, Reusable catalyst., 3-c]pyrazole, Nano-SiO2/hexamethylenetetramine} }