Hydrochloric Acid → 3,5-Dichloro-4-(3-chloro-5-trifluoromethyl-2-pyridyloxy)phenol

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Reaction Steps

Then, 1.39 g of 3,5-dichloro-4-(3-chloro-5-trifluoromethyl-2-pyridyloxy)-1-benzyloxybenzene, and 20 ml of methylene chloride were charged into a reaction vessel, and a solution of boron tribromide (1.63 g) in methylene chloride (10 ml) was added dropwise with stirring under ice cooling (-10° C. to 0° C.). After stirring for one hour under ice cooling, the mixture was poured into 10% hydrochloric acid and extracted twice with 50 ml of methylene chloride. Then, the organic layers were combined, washed with water, dried over anhydrous magnesium sulfate and concentrated to give a crude product. This crude product was subjected to silica gel column chromatography to give 1.03 g of 3,5-dichloro-4-(3-chloro-5-trifluoromethyl-2-pyridyloxy)phenol (yield, 93%), m.p., 152.6° C.

Provenance & Evidence