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Magnetically separable Fe 3 O 4 nanoparticles supply an environmentally friendly procedure for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthene and 1,8-dioxooctahydroxanthene derivatives. These compounds were obtained in high yields and short reaction times by the reaction of dimedone and 2-naphthol with various aromatic aldehydes under solvent-free conditions. The catalyst could be easily recovered using an external magnet and reused for six cycles with almost consistent activity.doi:10.2298/jsc120624156g fatcat:cptqdty74zbzlnmdc5piwqi5pu