An efficient and reusable catalyst for one-pot synthesis of dibenzoxanthene derivatives under solvent-free conditions based on p-sulfoanilino triazine

Author(s): Meisam Shabanian, Hassan Moghanian

Tris(p-sulfoanilino)triazine (TSAT), readily prepared from the reaction of sulfanilic acid and cyanuric chloride, as a cheap and commercially available reagents, can be used as an easily reusable catalyst for one-pot condensation of 2-naphtholwith aldehydes to construct dibenzoxanthene derivatives under solvent-free conditions.Avariety of techniques including Fourier transforminfrared spectroscopy (FTIR), nuclearmagnetic resonance (NMR) and thermal gravimetric analysis (TGA) were used to characterize this solid acid catalyst. Simple and easy work-up, low cost, green process, short reaction times and excellent yields of the products are the advantages of this procedure. The catalyst was recovered by simple filtration and used several times with high catalytic activity.

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