H ydrazides 3,4, Hydrazones 6a-c, bishydrazones 8a,b, N-hydroxy-N'- arylpropanehydrazonamide 9a,b and 1-(piperidin-1-yl)-N2-arylamidrazones 10a,b were prepared under ultrasonic waves as an approach for green chemistry.a notable good yield and short reaction time were afforded under ultrasonic waves.The structures of compounds were confirmed in terms of spectroscopic and elemental analyses.The invi...