nanocomposite based on sulfonated-melamine-formaldehyde resin and fe3o4 as a highly efficient catalyst for the synthesis of 1,4-dihydropyrano[2,3-c] pyrazole derivatives

Current research work presents a high efficiency polymer based nanocomposite as catalyst for using in the synthesis of organic compounds. among the polymer-based catalyst, sulfonated-melamine–formaldehyde resin, which has excellent physical and chemical stability, is widely used in chemical transformations. thus, a novel magnetic sulfonated melamine–formaldehyde resin (msmf) catalyst was successfully prepared from a mixture of sulfonated melamine-formaldehyde and fe3o4 nanoparticles. the resulted msmf was characterized by ftir, chnso, sem, vsm and tga analysis. the catalytic activity of msmf was examined in the preparation of 1,4-dihydropyrano[2,3-c] pyrazole derivatives. 1,4-dihydropyrano[2,3-c] pyrazole derivatives were synthesized via one‐pot three‐ component condensation of various aromatic aldehydes with malononitrile and 3-methyle -1-phenyl-5-pyrazolone in excellent yields in the presence of msmf as a highly efficient heterogeneous catalyst. results showed the msmf is an excellent catalyst for green chemical processes owing to its high catalytic activity, stability and reusability.