An efficient and eco-friendly synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes using H4[SiW12O40] as a heterogeneous and reusable catalyst under solvent-free conditions

A simple and efficient catalytic protocol for the synthesis of 14-aryl-14H-dibenzo[a,j]xanthenes via the one-pot condensation of β-naphthol and aryl aldehydes using silicotungstic acid (H4[SiW12O40]) is reported. The present method offers several advantages such as high to excellent yields, short reaction times, recovery and reusability of catalyst, mild reaction conditions and easy workup procedures.