2-Cyclohexen-1-one, 3-methoxy-5,5-dimethyl- → 2-Cyclohexenone, 5,5-dimethyl-

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A solution of 3-methoxy-5,5-dimethyl-cyclohex-2-enone (80 g, 0.52 mol) in anhydrous tetrahydrofuran (270 mL) was treated dropwise with a 1 M solution of LiAlH4 in tetrahydrofuran (182 mL), under argon atmosphere and keeping the temperature of the reaction between 0° C. and 5° C. The temperature was allowed to rise to 25° C. and the mixture was stirred for 4 hours. The resulting slurry was cooled with an ice bath, quenched with ethyl acetate (30 mL) and poured with caution into a cooled 2 M H2SO4 solution. The aqueous solution was then extracted with diethyl ether (300 mL×3), dried on Na2SO4 and evaporated under reduced pressure to remove most of the solvent. The crude material contained the title compound as a low boiling point oil that was used in the next step without further purification.

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