[OH:1][C@@H:2]([CH2:5][CH2:6][CH2:7][CH2:8][CH3:9])[CH:3]=[CH2:4].CCCCCC.[H-].[Na+].[CH2:18](Br)[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1>CN(C)C=O>[CH2:18]([O:1][C@@H:2]([CH2:5][CH2:6][CH2:7][CH2:8][CH3:9])[CH:3]=[CH2:4])[C:19]1[CH:24]=[CH:23][CH:22]=[CH:21][CH:20]=1A solution of 3(S)-hydroxy-1-octene (6.41 g., 0.05 mole) in dry dimethylformamide is added dropwise to a stirred suspension of hexane (2 × 10 ml.) -- prewashed sodium hydride (50% dispersion in mineral oil, 2.64 g., 0.055 mole) in dry dimethylformamide (45 ml.) at 25° C. Upon cessation of gas evolution, the reaction mixture is cooled to 0° to 5° C. and treated with a solution of benzyl bromide (10.3 g., 0.06 mole) in dry dimethylformamide (10 ml.). The resulting mixture is stirred at 25° C. for 16 hours, then is heated at 100° C. for 1 hour. After cooling to 25° C., the reaction mixture is diluted with ice water (50 ml.) and extracted with ether four times. The combined organic extract is washed with 2N hydrochloric acid and saturated aqueous brine, dried over magnesium sulfate and filtered. In vacuo evaporation of the filtrate leaves an oily residue which affords the title compound upon distillation as a colorless oil.
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