Preparation of Highly Active Triflic Acid Functionalized SBA‐15 Catalysts for the Synthesis of Coumarin under Solvent‐Free Conditions
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A. Vinu | V. Balasubramanian | M. El-Newehy | S. Al-Deyab | K. S. Lakhi | J. Choy | Geoffrey A. Lawrence | P. Kalita | Arun V. Baskar