Ammonia → Methyl 3-oxohexanoate
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[O-2].[Ca+2].[C:3]([O:9][CH3:10])(=[O:8])[CH2:4][C:5]([CH3:7])=[O:6].[C:11](Cl)(=O)[CH2:12]CC.[Cl-].[NH4+].N.Cl>C(Cl)Cl.O>[C:5]([CH2:4][C:3]([O:9][CH3:10])=[O:8])(=[O:6])[CH2:7][CH2:11][CH3:12][O-2].[Ca+2].[C:3]([O:9][CH3:10])(=[O:8])[CH2:4][C:5]([CH3:7])=[O:6].[C:11](Cl)(=O)[CH2:12]CC.[Cl-].[NH4+].N.Cl>C(Cl)Cl.O>[C:5]([CH2:4][C:3]([O:9][CH3:10])=[O:8])(=[O:6])[CH2:7][CH2:11][CH3:12]56 g (1 mol) of calcium oxide were placed in 650 ml of methylene chloride, and 116 g (1 mol) of methyl acetoacetate were added dropwise at 20° to 30° C. over 0.5 hour. Stirring was then continued for 1 hour at this temperature. 116 g (1.05 mol) of butyryl chloride were then metered in at a temperature of 30°-35° C. over one hour and stirring was then continued for 3 hours at this temperature. 54 g (1 mol) of ammonium chloride in 300 ml of water were then added to the viscous suspension at 30° C. and the resulting mixture was stirred for 30 minutes. The pH of the reaction mixture was adjusted to 9 with aqueous ammonia and stirring was continued for 3 hours at 30° C. After the reaction mixture had been acidified with concentrated hydrochloric acid (pH<1), it was washed with sodium bicarbonate solution and water. After separation of the water phase, the solvent was distilled off on an evaporator. This gave 141 g (GC purity 73%) of methyl butyrylacetate (yield 71%).
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