Coumarins attract interest because of their diverse biological activity.1 They find their application as pharmaceuticals, fragrances, agrochemicals, and insecticides.2 A valuable method for the synthesis of coumarins is the Pechmann reaction, of phenols. Using concentrated sulfuric acid
[Kuarm, B. Suresh; Madhav, J. Venu; Laxmi, S. Vijaya; Rajitha; Reddy, Y. Thirupathi; Reddy, P. Narsimha; Crooks, Peter A. Synthetic Communications, 2010 , vol. 40, # 22 p. 3358 - 3364]
