• AISHA SIDDEKHA

In this study, a one-pot four component synthesis of pyranopyrazoles from araldehydes (1), ethyl acetoacetate (2), malononitrile (3) and hydrazine hydrate (4) in the presence of catalytic amounts of heterogeneous silica-sodium hydrogen sulphate in water as a medium has been described. The ability to reuse the catalyst and good yields of the products are the important features of this method.

Multi-component reactions, Pyranopyrazoles, Heterogeneous catalysts, Silica-sodium hydrogen sulphate

"Synthesis of Pyranopyrazoles using a Silica-Sodium Sulphate as a reusable catalyst in water", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.8, Issue 12, page no.f207-f211, December-2021, Available :http://www.jetir.org/papers/JETIR2112526.pdf

"Synthesis of Pyranopyrazoles using a Silica-Sodium Sulphate as a reusable catalyst in water", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.8, Issue 12, page no. ppf207-f211, December-2021, Available at : http://www.jetir.org/papers/JETIR2112526.pdf