Hydrochloric Acid → 2,6-Dichloro-4-hydroxybenzaldehyde

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A solution of 2.50 M n-butyllithium in hexane (13.3 mL) was added to a stirred solution of (3,5-dichlorophenoxy)(triisopropyl)silane (10.1 g, 31.6 mmol) in THF (40 mL) under an atmosphere of nitrogen at −78° C. After stirring for 45 min at −78° C., DMF (5 mL) was added slowly. The mixture was allowed to warm to −10° C. After hydrolysis with 2 N HCl, the layers were separated and the aqueous layer separated and extracted with ethyl acetate twice. The combined organic solutions were dried over Na2SO4, filtered and concentrated. To the residue was added hexane (30 mL) and the precipitate was filtered and washed with hexane to give the desired product as a white precipitate. (5.50 g, 91%). LCMS for C7H5Cl2O2(M+H)+: m/z=191.

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