[CH:1]([CH:4]1[C:9]([O:10][CH3:11])=[CH:8][CH2:7][CH:6]=[C:5]1[O:12]C)([CH3:3])[CH3:2].Cl>CO>[CH:1]([CH:4]1[C:9]([O:10][CH3:11])=[CH:8][CH2:7][CH2:6][C:5]1=[O:12])([CH3:3])[CH3:2]To a solution of 6-isopropyl-1,5dimethoxy-cyclohexa-1,4-diene (7 g) in methanol (50 mL) was added 2.5% hydrochloric acid (10 mL) drop wise at 0° C. The reaction mixture was stirred for 45 minutes, then diluted with ice-cold water (30 mL). The product was extracted with ether (3×70 mL). The combined organic extracts were washed with brine and dried over anhydrous sodium sulfate. Removal of the solvent in vacuo yielded the title compound as a light yellow oil (6 g, 93%).
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