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An efficient and eco-friendly method for the one-pot synthesis of 13-aryl-indeno[1,2-b]naphtha[1,2-e]pyran-12(13H)-one derivatives has been developed in the presence of Co3O4@SiO2 core–shell nanocomposite. The multi-component reactions of 2H-indene-1,3-dione, β-naphthol and aldehydes were efficiently catalyzed using novel nano-scale materials under solvent-free conditions at 80 °C. Simple procedure,...