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, and 33 g of 30% aqueous potassium hydroxide solution was slowly added dropwise under ice cooling. After stirring for 1 hour, the mixture was made weak acidic by the addition of 10% hydrochloric acid, and then extracted twice with 150 m of diethyl ether under salting out. The 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 (87% yield).
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