Abstract
CuX2 (X=Cl, Br) are found to be efficient catalysts (10 mol%) for the Pechmann condensation reaction of phenols and β-ketoesters to give 4-substituted coumarins under solvent-free conditions. The yields of coumarin derivatives obtained via this new protocol, were equal or higher than those using the conventional method and the reaction time was reduced to a few minutes.
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