An　ultrasound-assisted　preparation　of　1,4-diazabutadienes　via　smooth　condensation　of　diketones　with　amines　under　solvent-free　conditions　is　described.　The　generality　of　this　method　was　examined　by　the　synthesized　N,N＇-diaryl-　and　N,N＇-dialkyl-1,4-diazabutadiene　derivatives.　In　addition　to　experimental　simplicity,　the　main　advantages　of　the　procedure　are　mild　conditions,　short　reaction　time　(2-15　min)　and　high　yields　(71-98%).　(C)　2010　Elsevier　B.V.　All　rights　reserved.