Base‐Free Transfer Hydrogenation of Nitroarenes Catalyzed by Micro‐Mesoporous Iron Oxide

An efficient and practical protocol for the transfer hydrogenation of nitroarenes was developed, which uses flower‐shaped micro‐mesoporous iron oxide (MMIO) with formic acid as the reducing agent and tris[(2‐diphenylphosphino)‐ethyl]phosphine as the ligand in the absence of an additional base. The recyclable catalytic system enables the reduction of the nitro group in a broad range of substrates to yield valuable amines and shows a high tolerance to sensitive functional groups.