Preparation and Characterization of Nano‐Fe₃O₄@[Mn(HA)₂.4H₂O] and its Application in Selective Synthesis of Amide Derivatives

Fe 3 O 4 nanoparticles, functionalized with a Mn 2+ ‐ascorbate complex, were synthesized and characterized using various methods including infrared spectroscopy, X‐ray diffraction, scanning electron microscopy, vibrating sample magnetometry, and X‐ray energy diffraction spectroscopy. These techniques confirmed the catalyst's spherical morphology, nanoscale size, magnetic properties, and elemental composition. The catalyst was then utilized for the direct amidation of carboxylic acids, successfully converting them to amides with aniline and its derivatives under solvent‐free conditions. This method offered several benefits: the magnetic nature of the catalyst allowed for easy separation of the reaction mixture by a magnetic field, promoted the selective preparation of aliphatic amides, and did not require activation of the carboxylic acids.