Easy Access to Coumarin Derivatives Using Alumina Sulfuric Acid as an Efficient and Reusable Catalyst under Solvent-Free Conditions

<table>A plausible mechanism for the Pechmann condensation of resorcinol and ethyl acetoacetate.</table>

Journal of Chemistry

Scheme 2: Easy Access to Coumarin Derivatives Using Alumina Sulfuric Acid as an Efficient and Reusable Catalyst under Solvent-Free Conditions 