[O:1]=[CH:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][C:10]([O:12][CH3:13])=[O:11].[CH:14]([Mg]Br)=[CH2:15].[Cl-].[NH4+]>C1COCC1>[OH:1][CH:2]([CH:14]=[CH2:15])[CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][C:10]([O:12][CH3:13])=[O:11]To a solution of methyl 9-oxononanate (5.26 g) in THF (60 ml) was dropwise added 0.95M vinyl magnesium bromide (31.1 ml) at −30° C. and then stirred for 30 minutes at −25° C. The reaction mixture was poured into saturated ammonium chloride aqueous solution and then extracted with diethyl ether. The organic layer was washed with saturated brine, dried over magnesium sulfate anhydride, and then evaporated under reduced pressure. The residue was purified by silica gel column chromatography (n-hexane:ethyl acetate=3:1) to give methyl 9-hydroxy-10-undecenate (3.41 g, 56.3%).
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