[CH2:1]([C:3]1([CH2:10][CH3:11])[CH2:8][CH2:7][C:6](=[O:9])[CH:5]=[CH:4]1)[CH3:2].[H][H]>C(O)(=O)C.[C].[Pd]>[CH2:10]([C:3]1([CH2:1][CH3:2])[CH2:8][CH2:7][C:6](=[O:9])[CH2:5][CH2:4]1)[CH3:11]In 22 ml of acetic acid was dissolved 2.20 g of 4,4-diethyl-2-cyclohexen-1-one, to which was added 0.22 g of 5% palladium-carbon. Under a pressure of 5 atmospheres, the mixture was stirred at ambient temperature for one hour under a stream of hydrogen. The reaction mixture was filtered, and the solvent was distilled off under reduced pressure. Purification of the residue by column chromatography [eluent: hexane:ethyl acetate=10:1] gave 1.90 g of 4,4-diethyl-1-cyclohexanone as a colorless oily product.
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