Magnetic Co‐doped NiFe 2 O 4 Nanocomposite: A Heterogeneous and Recyclable Catalyst for the One‐Pot Synthesis of Benzimidazoles, Benzoxazoles and Benzothiazoles under Solvent‐Free Conditions

A simple and efficient procedure for the synthesis of benzimidazoles, benzoxazoles, and benzothiazoles via the condensation of o ‐phenylenediamine, o ‐aminophenol, and o ‐aminothiophenol with various benzaldehydes by using magnetic Co‐doped NiFe 2 O 4 nanoparticles has been developed. This nanocatalyst has advantages such as excellent product yields, solvent‐free conditions, and very short reaction times. After any experiment, the magnetic nanocatalyst could be easily separated with the aid of an external magnet and reused at least four times without any loss of its catalytic performance.