[Mg].Br[C:3]1[CH:8]=[CH:7][C:6]([CH2:9][CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH3:16])=[CH:5][CH:4]=1.C([O:19][C:20]1[CH2:25][CH2:24][CH2:23][C:22](=O)[CH:21]=1)C.Cl>C1COCC1.CCOCC>[CH2:9]([C:6]1[CH:7]=[CH:8][C:3]([C:22]2[CH2:23][CH2:24][CH2:25][C:20](=[O:19])[CH:21]=2)=[CH:4][CH:5]=1)[CH2:10][CH2:11][CH2:12][CH2:13][CH2:14][CH2:15][CH3:16]
To a suspension of magnesium (1.477 g, 60.8 mmol) in THF (56 mL) was added 1-bromo-4-octylbenzene (15.00 g, 55.7 mmol). After stirring for about 6 h the reaction mixture was added with filtering to a solution of 3-ethoxycyclohex-2-enone (7.10 g, 50.6 mmol) in THF (28.0 mL) at 0° C. Following the addition the reaction mixture was allowed to warm to room temperature. After 1 h 1N HCl was added until a pH of 1 was obtained. The reaction mixture was diluted with Et2O and the organic layer was separated, washed with NaHCO3, and brine, dried with (Na2SO4, filtered and concentrated in vacuo. The crude product was purified by chromatography on silica gel (EtOAc/Hep) to provide 3-(4-octylphenyl)cyclohex-2-enone (9.5 g, 33.4 mmol, 65.9% yield) as a colorless oil.
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