Hard I l e t i t i l y li,irl-RI,1ru-Uiiivc.rsitat Leipzig, Sektion Chemie. Talstral3e ,35, Lripzig. DDR-1010 JIcrrn Projessor Dr. Egon Uhlig zum 0'0. Geburtstny grwidmet Srr nllllary A t sujficieiitly high antenstties ultrasottzc irradicitiott oj Itquzrls causes cavrtation which lends to extremely high local tentperaturea m d pressures. Therefore, chemmil reactions niuy be nccelerutetl by ultrasound. This eflect is called sonochemistry. Using representative examples from both homogeneous and heterogeneous chemistry, the applications of sonochemistry in synthetic chemistry ure illustrated.