[CH3:1][CH:2]1[CH2:7][CH2:6][CH2:5][CH:4]([CH3:8])[C:3]1=[O:9].O.O.O.O.O.O.C(O[O-])(=O)C1C(=CC=CC=1)C([O-])=[O:20].[Mg+2].C(=O)(O)[O-].[Na+]>CO.O>[CH3:8][CH:4]1[CH2:5][CH2:6][CH2:7][CH:2]([CH3:1])[O:20][C:3]1=[O:9]A 250 mL round bottom flask was charged with 2,6-dimethylcyclohexanone (2.162 mL, 2.0 g, 15.85 mmol) and 126 mL of a 1:1 methanol/water mixture. The solution stirred as magnesium monoperoxyphthalate hexahydrate (MMPP, 15.68 g, 31.7 mmol) and sodium bicarbonate (2.66 g, 31.7 mmol) were added. The reaction proceeded overnight at room temperature with stirring. The following day the crude product was extracted into ethyl acetate, washed sequentially with saturated sodium bicarbonate, brine and dried over anhydrous sodium sulfate before concentrating in vacuo to give 1.07 g (47.5% yield) of 3,7-dimethyloxepan-2-one (61) as a clear, colorless oil.
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