Fe 3 O 4 @C@ prNHSO 3 H : A novel magnetically recoverable heterogeneous catalyst in green synthesis of diverse triazoles

The core–shell magnetic nano‐catalyst of Fe 3 O 4 @C@PrNHSO 3 H was proposed, synthesized, and fully described by transmission electron microscopy, field‐emission scanning electron microscope, energy‐dispersive X‐ray, vibrating sample magnetometer, thermal gravimetric analysis, X‐ray diffraction, Fourier transform infrared, and X‐ray photoelectron spectroscopy analysis. Nontoxic texture, magnetic recovery capability, high thermal stability as well as low‐cost synthesis method were found as the unique features of the synthesized core–shell magnetic nano‐catalyst. Fe 3 O 4 @C@PrNHSO 3 H NPs were introduced as a modern magnetic heterogeneous catalyst in the solvent‐free synthesis of triazole derivatives through one‐pot, three‐component condensation of aldehyde, ammonium acetate, and nicotinic hydrazide. The pleasant yield of products, straightforward work‐up, mild reaction conditions, along with magnetically recoverable catalyst were enumerated as the most important advantages of the method. The Fe 3 O 4 @C@PrNHSO 3 H could be easily separated from the reaction mixture by an external magnet and reused six times with the desired catalytic activity.