Ethyl benzoylacetate → 4-Penten-1-one, 1-phenyl-

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A sodium solution of alcohol was prepared by dissolving 33 g of sodium in 1000 mL of ethanol. To the warm solution, 260 mL of benzoyl-acetic acid-ethylester was added and then 130 mL of allyl bromide was slowly dropped into the solution. The mixture was refluxed for 4 hrs. and then the solid removed in a vacuum. The resulting solid was then combined in an aqueous solution of potassium hydroxide prepared by combining 145 g of potassium hydroxide with 500 mL of water. This mixture was heated under reflux for 4 hrs. The mixture was then neutralized and extracted three times with 150 mL of diethylether. The organic layer was separated, washed twice with water, and dried. The solvent was removed in a vacuum to produce a 98 percent yield of phenyl-(but-3-enyl)ketone.

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