Ethanol → (1R,2R)-ethyl 2-(4-hydroxyphenyl)cyclopropanecarboxylate

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2-(4-Methoxy-phenyl)-trans-cyclopropanecarboxylic acid ethyl ester (1.43 g, 6.51 mmol) is dissolved in dry dichloromethane (30 mL) and cooled to −78° C. Boron tribromide solution (1 M in dichloromethane, 7.81 mL, 7.81 mmol) is added dropwise then the mixture is allowed to warm to −20° C. and stirred overnight at −20° C. Ethanol (3 mL) is added and the mixture warmed to room temperature then diluted with saturated aqueous sodium bicarbonate solution. The phases are separated and the aqueous phase extracted with dichloromethane. The combined organic phases are dried through a phase seperator and the solvent removed under vacuum. The residue is purified by flash chromatography (10% ethyl acetate in cyclohexane) and then crystallised from 10% ethyl acetate in cyclohexane to give the title compound (yield 0.58 g).

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