Document Type: Research Paper
Islamic Azad University
Chemistry Department, College of Science Shahid Chamran University, Ahvaz, Iran
Department of Chemistry, Payame Noor University, PO BOX 19395-4697 Tehran, Iran
Chemistry Department, Qaemshahr Branch, Islamic Azad University, P.O. Box 163, Qaemshahr, Iran
1Department of Chemistry, Payame Noor University, PO BOX 19395-4697 Tehran, Iran
A simple and facile method for the preparation ofFe2+ supported on hydroxyapatite-core-shell-γ-Fe2O3 nanoparticles (γ-Fe2O3@HAp-Fe2+ NPs) as an environmentally friendly and recyclable green catalyst is described and used for the one-pot synthesis of benzimidazoles and benzoxazole derivatives via reactions between aromatic aldehydes and ortho‐phenylenediamine or ortho‐aminophenol in aqueous media conditions at room temperature. This green method offers significant advantages in terms of its simplicity, very low loading of catalyst, high catalytic efficiency, good to excellent product yields, short reaction time, simple experimental and work-up procedure. Also, after the reaction, γ-Fe2O3@HAp-Fe2+ NPs can be easily recovered and reused for at least ten runs. This magnetic nanoparticle was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscope (SEM) and vibrating sample magnetometry (VSM) spectra.