Abstract: β-Diketones (butyrylacetone, isobutyrylacetone, isovalerylacetone) were treated with acrylonitrile in the presence of aqueous potassium hydroxide giving monocyanoethylated-β-diketones (Ⅰ)-(Ⅲ), which by heating with HCl were isomerized to the corresponding 3,4-dihydro-2-(1H) pyridones (Ⅳ)-(Ⅵ). (Ⅰ)-(Ⅲ) were hydrolyzed to the ketoacids (Ⅶ)-(Ⅸ). semicarbazone (Ⅹ)-(ⅩⅤ) were prepared from 5-acetyl-6-methyl-3,4dihydyo-2(1H) pyridones; pyrazole(ⅩⅥ)-(ⅩⅨ) were prepared from β-diketoncids. compounds (Ⅰ)-(ⅩⅪ) were reported for the first time.