C([O:9][C:10]1[CH:15]=[CH:14][C:13]([O:16][CH2:17][CH:18]=[C:19]([Cl:21])[Cl:20])=[CH:12][CH:11]=1)(=O)C1C=CC=CC=1.[OH-].[K+].Cl>CO>[Cl:20][C:19]([Cl:21])=[CH:18][CH2:17][O:16][C:13]1[CH:14]=[CH:15][C:10]([OH:9])=[CH:11][CH:12]=1A reaction vessel was charged with 44.1 g of 4-(3,3-dichloro-2-propenyloxy)phenyl benzoate and 400 ml of methanol, to which 33 g of 30% potassium hydroxide solution was slowly added dropwise under ice cooling. After stirring for 1 hour, the reaction mixture was weakly acidified by the addition of 10% hydrochloric acid and extracted twice with 150 ml of diethyl ether under salting out. The diethyl ether layers were combined, washed with water, dried over anhydrous magnesium sulfate and then concentrated to give a crude product. The crude product was subjected to silica gel chromatography, which afforded 26.0 g of 4-(3,3-dichloro-2-propenyloxy)phenol (yield, 87%).
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