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<p>This study describes the preparation and thorough analysis of Fe<sub>3</sub>O<sub>4</sub>@FSM-16@Pr-OPO<sub>3</sub>H<sub>2</sub>, introduced as a newly developed heterogeneous nanocatalyst. Magnetic Fe<sub>3</sub>O<sub>4</sub> nanoparticles were first synthesized via a co-precipitation approach and subsequently coated with FSM-16 mesoporous silica, forming Fe<sub>3</sub>O<sub>4</sub>@FSM-16 The nanocatalyst was obtained through the chemical anchoring of 3-chloropropyltrimethoxysilane onto Fe<sub>3</sub>O<sub>4</sub>@FSM-16, which was then treated with ammonium dihydrogen phosphate. Various analytical techniques, including FT-IR, XRD, VSM, FE-SEM, TGA, EDS, and BET, were employed to characterize the synthesized nanocatalyst. Next, Fe<sub>3</sub>O<sub>4</sub>@FSM-16@Pr-OPO<sub>3</sub>H<sub>2</sub> was applied as a highly efficient and magnetically recoverable nanocatalyst for the synthesis of pyrano[2,3-<i>c</i>]pyrazole derivatives by reaction of aromatic aldehydes, malononitrile, and 3-methyl-1-phenyl-2-pyrazolin-5-one under solvent-free conditions. The corresponding products were obtained in high yields (90–97%) in relatively short times (15–40&#xa0;min).</p>

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A recyclable magnetic mesoporous catalyst functionalized with phosphoric acid for efficient synthesis of pyrano[2,3-c]pyrazole derivatives

  • 期刊论文

  • 发表日期：

    2026年1月7日

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  • Maryam Karimi,
  • Azar Jahanbakhshi,
  • Mahnaz Farahi

摘要

This study describes the preparation and thorough analysis of Fe3O4@FSM-16@Pr-OPO3H2, introduced as a newly developed heterogeneous nanocatalyst. Magnetic Fe3O4 nanoparticles were first synthesized via a co-precipitation approach and subsequently coated with FSM-16 mesoporous silica, forming Fe3O4@FSM-16 The nanocatalyst was obtained through the chemical anchoring of 3-chloropropyltrimethoxysilane onto Fe3O4@FSM-16, which was then treated with ammonium dihydrogen phosphate. Various analytical techniques, including FT-IR, XRD, VSM, FE-SEM, TGA, EDS, and BET, were employed to characterize the synthesized nanocatalyst. Next, Fe3O4@FSM-16@Pr-OPO3H2 was applied as a highly efficient and magnetically recoverable nanocatalyst for the synthesis of pyrano[2,3-c]pyrazole derivatives by reaction of aromatic aldehydes, malononitrile, and 3-methyl-1-phenyl-2-pyrazolin-5-one under solvent-free conditions. The corresponding products were obtained in high yields (90–97%) in relatively short times (15–40 min).