Ultrasound Assisted Catalyst-Free One -Pot Synthesis of Biscoumarins in Neat Water

Abdulkarim M. A. Al-Kadasi and

Abstract

An efficient and simple catalyst-free one pot synthesis of biscoumarins by condensing 4- hydroxycoumarin with aromatic aldehydes in water under ultrasound irradiations at ambient temperature with excellent yield of the desired products in shorter reaction time is described.