OICC Press Iranian Journal of Catalysis 2345-4865 8 3 2024 02 03 Fe3O4@SiO2@Am-PPC-SO3H] [HSO4]: A new magnetic solid acid nanocatalyst for the synthesis of benzoxazole derivatives EN Mona Sayyahi Department of Chemistry, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran. Maryam Gorjizadeh Department of Chemistry, Shoushtar Branch, Islamic Azad University, Shoushtar, Iran. Soheil Sayyahi Department of Chemistry, Mahshahr Branch, Islamic Azad University, Mahshahr, Iran. Journal Article 2024 02 03 A novel magnetite nanoparticle-based heterogeneous acidic catalyst [Fe3O4@SiO2@Am-PPC-SO3H] [HSO4] was successfully prepared and characterized by SEM, EDX, TGA, VSM and FT-IR techniques. The magnetically retrievable and sustainable catalyst was investigated in the reaction of aldehyde and o-aminophenol for the synthesis of benzoxazoles. The reactions occurred in water and produced the corresponding products in high yields. The catalyst could be readily separated by an external magnet and showed excellent reusability without significant loss of its activity.