CN(C)C=O.[CH3:6][O:7][C:8]1[CH:13]=[C:12]([C:14](=[O:16])[CH3:15])[CH:11]=[CH:10][C:9]=1[OH:17].Br[CH2:19][C:20]([O:22][CH2:23][CH3:24])=[O:21].C(=O)([O-])[O-].[K+].[K+]>O>[CH3:6][O:7][C:8]1[CH:13]=[C:12]([C:14](=[O:16])[CH3:15])[CH:11]=[CH:10][C:9]=1[O:17][CH2:19][C:20]([O:22][CH2:23][CH3:24])=[O:21]To dimethylformamide (200 ml) are added 2-methoxy-4-acetylphenol (20 g), ethyl α-bromoacetate (15 ml) and potassium carbonate (18.3 g), and the mixture is stirred at room temperature overnight. After the reaction is complete, water is added to the mixture, and the mixture is extracted with ethyl acetate. The extract is washed with aqueous sodium hydrogen carbonate solution, and dried over magnesium sulfate, and concentrated under reduced pressure to remove the solvent. The resulting crystals are collected, and washed with n-hexane-diethyl ether to give ethyl α-(2-methoxy-4-acetylphenoxy)acetate (23.86 g).
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