OICC Press Iranian Journal of Catalysis 2345-4865 15 1 2025 01 08 Fe3O4@nano-coconut shell/Cu(II): A Unique and Reusable Catalyst for Green Synthesis of naphtho[1,3]oxazine Derivatives 1 8 10.57647/j.ijc.2025.1501.07 EN Farhad Hajati Department of Organic Chemistry, Faculty of Chemistry, College of Science, Yazd University, Yazd, Iran https://orcid.org/0000-0002-8789-5278 Bi Bi Fatemeh Mirjalili Department of Organic Chemistry, Faculty of Chemistry, College of Science, Yazd University, Yazd, Iran https://orcid.org/0000-0002-6588-4041 Journal Article 2025 01 08 Coconut shell nanoparticles were transformed into magnetic nanoparticles (Fe3O4@nano-coconut shell) that were utilized for Lewis acid (Cu(II)) support. Consequently, the synthesis of the Fe3O4@nano-coconut shell/Cu(II) catalyst, possessing easy and complete recovery capabilities, was achieved. The characterization of Fe3O4@nano-coconut shell/Cu(II) was conducted using various techniques, including FT-IR, FESEM, VSM, EDS-MAP, XRD, BET, and TGA. The catalytic efficacy of Fe3O4@nano-coconut shell/Cu(II) as a potent Lewis acid nano-catalyst was assessed for the manufacture of 2-aryl-2,3-dihydro-1H-naphtho[1,2-e][1,3]oxazine derivatives via a reaction of formaldehyde, aniline derivatives, and phenolic substrate such as β-naphthol. Fe3O4@nano-coconut shell/Cu(II) demonstrated robust performance in the reaction and could be reused up to four consecutive times with only a minor decline in catalytic activity. Research Highlights Fe3O4@nano-coconut shell/Cu(II) catalyst with a very easy and complete recovering ability was synthesized. The synthesized catalyst was characterized by different techniques such as FT-IR, FESEM, VSM, EDS-MAP, XRD, BET as well as TGA. The catalytic performance of Fe3O4@nano-coconut shell/Cu(II) was evaluated. Synthesis of 2-aryl-2,3-dihydro-1H-naphtho[1,2-e][1,3]oxazine derivatives was done. Fe3O4@nano-cocoanut shell/Cu(II) can be effective in reaction and reused four times.