Ultrasonic synthesis of 4,4′-dihydroxychalcone and its photochemical properties

4,4′-Dihydroxychalcone was synthesized under ultrasonic irradiation in the presence of HCl gas as a catalyst. It provided a convenient procedure with shorter reaction time and higher yield compared with conventional methods. The factors influencing the yield were discussed, and the photochemical properties of 4,4′-dihydroxychalcone were also studied.