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■ Silica Sulfuric Acid as an Efficient and Reusable Catalyst for the Pechmann Synthesis of Coumarins under Solvent-Free Conditions

Minoo Dabiri,* Peyman Salehi,* Mohammad Ali Zolfigol, and Mostafa Baghbanzadeh

*Department of Chemistry, Faculty of Science, Shahid Beheshti University, Postal Code 1983963113, Evin, Tehran, Iran

Abstract

Silica sulfuric acid is used as an efficient catalyst in the Pechmann condensation of phenols with β-keto-esters leading to the formation of coumarin derivatives in excellent yields under solvent-free conditions. It was found that the catalyst could be recycled and reused for several runs.