[Mg].Br[C:3]1[CH:8]=[CH:7][C:6]([CH3:9])=[CH:5][CH:4]=1.[CH3:10][C:11]1[CH:25]=[CH:24][C:14]([C:15]([C:17]2[CH:22]=[CH:21][C:20]([CH3:23])=[CH:19][CH:18]=2)=[O:16])=[CH:13][CH:12]=1.C(=O)([O-])O.[Na+]>O1CCCC1.C(OCC)(=O)C>[CH3:10][C:11]1[CH:12]=[CH:13][C:14]([C:15]([C:3]2[CH:8]=[CH:7][C:6]([CH3:9])=[CH:5][CH:4]=2)([C:17]2[CH:22]=[CH:21][C:20]([CH3:23])=[CH:19][CH:18]=2)[OH:16])=[CH:24][CH:25]=1
A Grignard reagent was prepared from magnesium (0.14 g, 5.76 mmol) (Wako Pure Chemical Industries, Ltd.) and p-bromotoluene (0.48 g, 5.45 mmol) (Wako Pure Chemical Industries, Ltd.). 4,4′-dimethylbenzophenone (0.60 g, 2.85 mmol) (Wako Pure Chemical Industries, Ltd.) was dissolved in tetrahydrofuran (5 mL) (KANTO CHEMICAL CO., INC.), and it was added dropwise to the Grignard reagent while cooling with ice, followed by stirring at room temperature for 4 hours. A saturated aqueous solution of sodium hydrogen carbonate (Wako Pure Chemical Industries, Ltd.) was added to the reaction solution while cooling with ice, and mixture was extracted with ethyl acetate (Wako Pure Chemical Industries, Ltd.). The organic layer was washed with brine. After that, the organic layer was dried with anhydrous sodium sulfate (Wako Pure Chemical Industries, Ltd.), and the solvent was distilled off under reduced pressure. The residue was subjected to silica gel column chromatography (n-hexane (Wako Pure Chemical Industries, Ltd.):ethyl acetate (Wako Pure Chemical Industries, Ltd.)=19:1 as an eluent), to thereby obtain the title compound (0.74 g, 86% yield).
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