Copper Immobilized on Isonicotinic Acid Hydrazide Functionalized Nano‐Magnetite as a Novel Recyclable Catalyst for Direct Synthesis of Phenols and Anilines

Abstract A new nano‐catalyst which contains a core of magnetic Fe 3 O 4 nanoparticles (NPs) has been fabricated. It is covered via isonicotinic acid hydrazide and copper (Cu). In this sense, Isonicotinic acid hydrazide (INH) is applied because of its ability as a bidendental ligand and pharmaceutical activity in order to be used for the complexion and connection of Cu on Fe 3 O 4 surface for the synthesis of Fe 3 O 4 @INH@Cu (INH= Isonicotinic acid hydrazide). In this regard, Fe 3 O 4 @INH@Cu as a heterogeneous nanocatalyst for the cross‐coupling of aryl halides with potassium hydroxide (KOH) as the hydroxide source and ammonium acetate (NH 4 OAc), as the amine source in the presence of cesium carbonate (Cs 2 CO 3 ) in polyethylene glycol (PEG‐400), has been applied. The catalyst is a new magnetically recyclable catalytic system with easy preparation and purification, high activity, eco‐friendly and economic advantages.