2-tert-Butyl-5-[(N-alkyl or N, N-dialkyl acetamide) epoxy]-4- chloropyridazine-3(2H)-one (1a-1l) were synthesized from the corresponding N-alkyl or N, N-dialkyl-2-chloroacetamide (4a-4l) with 2-tert-butyl-5-hydroxy-4-chloro-pyridazine-3(2H)-one(3). The preliminary biological tests indicate that some compounds of (1a-1l) show an insecticidal activity.

Key words: INFRARED SPECTROPHOTOMETRY, BIOLOGICAL ACTIVITY, PROTON MAGNETIC RESONANCE SPECTROMETRY, NMR SPECTROMETRY, ELEMENTAL ANALYSIS, INSECTICIDES, ACETAMIDE, PYRIDAZINONE P