Potassium Iodide → 1-[4-(3-Carbomethoxyprop-2-eneoxy)phenyl]propan-2-one

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A mixture of 4-hydroxyphenylpropan-2-one ethylene ketal (3.0 g) and potassium carbonate (2.13 g) in acetone (50 ml) was treated with methyl 4-bromocrotonate (2.77 g) and a trace of potassium iodide. After heating under reflux for 12 hours, the solution was filtered, the solvent evaporated and the residue dissolved in methanol (50 ml) and 2.5 N hydrochloric acid (25 ml). The solution was stirred at ambient temperature for 2 hours, the solvent evaporated, the residue extracted with ether, washed with 2 N sodium hydroxide, water and dried (MgSO4). Removal of the solvent gave the title compound as an oil (2.3 g).

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