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Nano-SiO2/hexamethylenetetramine promoted synthesis of pyrano[2,3-c] pyrazoles under solvent-free conditions | ||
Iranian Journal of Catalysis | ||
مقاله 2، دوره 10، شماره 1، خرداد 2020، صفحه 17-22 اصل مقاله (1.71 M) | ||
نوع مقاله: Articles | ||
نویسندگان | ||
Bi Bi Fatemeh Mirjalili* ؛ Mina Keihanfar | ||
Department of Chemistry, Faculty of Sciences, Yazd University, P.O. Box 89195-741, Yazd, I.R. Iran. | ||
چکیده | ||
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. | ||
کلیدواژهها | ||
Nano-SiO2/hexamethylenetetramine؛ Multicomponent reactions؛ Pyrano[2,3-c]pyrazole؛ Basic nanocatalyst؛ Reusable catalyst | ||
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مراجع | ||
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