[Mg].Br[C:3]1[CH:8]=[CH:7][C:6]([O:9][CH2:10][CH3:11])=[C:5]([Cl:12])[C:4]=1[F:13].[CH2:14]([CH:19]1[CH2:24][CH2:23][C:22](=[O:25])[CH2:21][CH2:20]1)[CH2:15][CH2:16][CH2:17][CH3:18].Cl>C1COCC1.C1(C)C=CC=CC=1>[Cl:12][C:5]1[C:4]([F:13])=[C:3]([C:22]2([OH:25])[CH2:21][CH2:20][CH:19]([CH2:14][CH2:15][CH2:16][CH2:17][CH3:18])[CH2:24][CH2:23]2)[CH:8]=[CH:7][C:6]=1[O:9][CH2:10][CH3:11]2.9 g of well dried magnesium and 20 mL of THF were placed in a reactor under nitrogen atmosphere, and heated to 43° C. 30.0 g of 1-bromo-3-chloro-4-ethoxy-2-fluoro benzene (1) dissolved in 80 mL of THF was slowly added dropwise thereto at a temperature range of from 38 to 46° C., followed by stirring for 90 minutes. Thereafter, 19.0 g of 4-pentylcyclo hexanone dissolved in 20 mL of THF was slowly added dropwise thereto at a temperature range of from 38 to 44° C., followed by stirring for 60 minutes. After cooling the resulting reaction mixture to 30° C., the reaction mixture was mixed with 100 mL of 3N hydrochloric acid and 100 mL of toluene in a vessel and separated into an organic layer and an aqueous layer by standing still, so as to attain extraction. The resulting organic layer was fractionated and washed with water, a 2N sodium hydroxide aqueous solution, a saturated sodium bicarbonate aqueous solution and water, followed by drying over anhydrous magnesium sulfate. Thereafter, the solvent was removed by distillation under reduced pressure to obtain 39.5 g of 1-(3-chloro-4-ethoxy-2-fluorophenyl)-4-pentylcyclohexanol (3). The resulting compound (3) was a yellow oily matter.
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