[Cl:1][C:2]1[CH:14]=[CH:13][C:5]([C:6]([CH:8]=[CH:9][C:10]([OH:12])=[O:11])=[O:7])=[CH:4][CH:3]=1.S(OC)(OC)(=O)=O.C(=O)([O-])[O-].[K+].[K+].[CH2:28](OCC)[CH3:29]>CN(C)C=O>[Cl:1][C:2]1[CH:3]=[CH:4][C:5]([C:6]([CH:8]=[CH:9][C:10]([O:12][CH2:28][CH3:29])=[O:11])=[O:7])=[CH:13][CH:14]=1To a solution of 4.22 g of 3-(4-chlorobenzoyl)-acrylic acid in 40 ml of dimethylformamide were added 3.68 g of dimethyl sulfate and 1.36 g of potassium carbonate, and the mixture was stirred at room temperature for 3 hours. To the reaction solution was added diethyl ether. The mixture was washed, in turn, with water, a saturated aqueous solution of sodium hydrogencarbonate and water, and dried over magnesium sulfate. The diethyl ether was removed from the mixture by evaporation, and the residue was recrystallized from hexane to give 2.68 g of ethyl 3-(4-chlorobenzoyl)acrylate.
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