[Br-].[CH2:2]([C:5]1[CH:30]=[CH:29][C:8]([CH2:9][P+](C2C=CC=CC=2)(C2C=CC=CC=2)C2C=CC=CC=2)=[CH:7][CH:6]=1)[CH2:3][CH3:4].CC(C)([O-])C.[K+].[CH:37]([CH:39]1[CH2:44][CH2:43][C:42](=[O:45])[CH2:41][CH2:40]1)=O.O>C1COCC1>[CH2:2]([C:5]1[CH:30]=[CH:29][C:8]([CH:9]=[CH:37][CH:39]2[CH2:44][CH2:43][C:42](=[O:45])[CH2:41][CH2:40]2)=[CH:7][CH:6]=1)[CH2:3][CH3:4]Suspension of 114 g of 4-n-propylbenzyltriphenyl phosphonium bromide in 500 ml of THF was stirred under nitrogen gas stream and 32.3 g of potassium-t-butoxide was added thereto at room temperature. After stirred at room temperature for 1 hour, a solution of 31.2 g of 4-formylcyclohexanone in 200 ml of THF was added dropwise to the suspension. After stirred at room temperature for 2 hours, 1 l of water was added thereto and then it was extracted with 1 l of ethyl acetate. Organic layer was washed with water and dried over anhydrous magnesium sulfate, the solvent was distilled off under a reduced pressure, and then 500 ml of heptane was added thereto. Precipitate thus separated was filtered off and purified by a column chromatography over a silica gel by using ethyl acetate/heptane (1/5) as an eluent, and the solvent was distilled off under a reduced pressure to obtain 42 g of 4-(2-(4-n-propylphenyl)ethenyl)cyclohexanone.
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