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Artificial photosynthesis by catalysts for water oxidation and organic reaction will push the development of sustainable chemistry. To develop economic and ecofriendly catalysts for water oxidation and one step oxidation–cyclization, herein, poly­(p-aminobenzoic acid-aniline)@Fe2O3 (labeled as PPaba@Fe2O3) nanospheroids were synthesized by Fe3+ catalyzed oxidation–polymerization in a one step hydrothermal process. Results demonstrate that PPaba@Fe2O3 can be both catalyst and electron acceptor during a photodriven water oxidation process. In particular, 2,3-dihydrophthalazine-1,4-dione (Dpd) was synthesized by one step oxidation–cyclization of benzyl alcohol and hydrazine in water containing PPaba@Fe2O3/[Ru­(bpy)3]­Cl2. Therefore, the catalyst can be applied in the sustainable synthesis of Dpd derivatives.

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