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- [2] PWA/montmorillonite K10 catalyst for synthesis of coumarins under solvent-free conditions Journal of Porous Materials, 2012, 19 : 233 - 242
- [9] SnCl4 grafted on silica gel: an efficient catalyst for solvent-free synthesis of coumarins via the Pechmann condensation Journal of the Iranian Chemical Society, 2017, 14 : 737 - 742
- [10] A Solvent-Free Synthesis of Coumarins Using Phosphotungstic Acid as Catalyst Catalysis Letters, 2009, 131 : 321 - 327