OICC Press Iranian Journal of Catalysis 2345-4865 15 1 2024 11 25 Functionalized Fe3O4 hybrid nanocatalyst for the green synthesis of polyhydroqunolines, tetrahydrobenzopyranes, and 1,4-dihydropyridines derivatives 1 15 10.57647/j.ijc.2025.1501.04 EN Kaveh Khosravi Department of Chemistry, Faculty of Science, Arak University, Arak, Iran   AND Institute of Nanoscience and Nanotechnology, Arak University, Arak, Iran https://orcid.org/0000-0002-5671-944X Amir Azizi Department of Chemistry, Faculty of Science, Arak University, Arak, Iran   AND Institute of Nanoscience and Nanotechnology, Arak University, Arak, Iran https://orcid.org/0000-0002-4970-8646 Mohammad Ali Zolfigol Faculty of Chemistry, Bu-Ali Sina University, Hamedan, Iran https://orcid.org/0000-0002-4970-8646 Fatemeh Afsharnadery Department of Chemistry, Faculty of Science, Arak University, Arak, Iran https://orcid.org/0000-0002-6539-603X Zahra Nazari Department of Chemistry, Faculty of Science, Arak University, Arak, Iran https://orcid.org/0000-0001-5692-8586 Journal Article 2024 11 25 Recently, nanocatalysts, and especially their magnetic types, have been functionalized by appropriate organic groups and have been widely used in the synthesis of various materials. In this work, functionalized Fe3O4 nanoparticles by tris(hydroxymethyl)aminomethane/cyanuric chloride/2-pyridineethanol/SO3H were synthesized and characterized by FESEM, EDX, FT-IR, VSM, and XRD analyses. Their catalytic efficiency was tested in the synthesis of polyhydroqunolines (19 entries, 12-25 minutes, 85-95%, solvent-free, room temperature), 1,4-dihydropyridines (16 entries, 25-50 minutes, 88-92%, solvent-free, 80 °C),  and tetrahydrobenzopyranes (17 entries, 10-52 minutes, 90-97%, solvent-free, room temperature) derivatives under mild and environmentally friendly reaction conditions. This novel nano organic/inorganic hybrid acidic catalyst was easily separable by an external magnet. Fast reaction times and high purity of the products are the remarkable advantages of this new catalyst.