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In this work, Fe 3 O 4 @nano-walnut shell/B III  (FNWSB), as a reusable and new catalyst was prepared and then characterized by FT-IR, XRD, FESEM, EDS-MAP, and TGA. This catalyst was used for synthesis of tetrahydrobenzo[ a ]xanthen-11-ones via three-component, one-pot condensation reaction of dimedone,  β -naphthol, and aromatic aldehydes. An uncomplicated work-up, high yields of product, short reaction times, and use of low-cost catalyst are considerable advantages of this procedure.

Fe 3 O 4 @Nano-Walnut Shell/B III as a New Natural Based Catalyst for Synthesis of Tetrahydrobenzo[ a ]Xanthene-11-One Derivatives