[F:1][C:2]1[CH:3]=[C:4]([CH:11]=[C:12]([F:15])[C:13]=1F)[C:5]([O:7][CH2:8][C:9]#[CH:10])=[O:6].[CH2:16]([OH:19])[C:17]#[CH:18].[H-].[Na+].O>CN(C=O)C>[F:15][C:12]1[CH:11]=[C:4]([CH:3]=[C:2]([F:1])[C:13]=1[O:19][CH2:16][C:17]#[CH:18])[C:5]([O:7][CH2:8][C:9]#[CH:10])=[O:6]
To a solution of 5.0 g of 2-propynyl 3,4,5-trifluorobenzoate and 1.7 g of propargyl alcohol in 20 ml of DMF was added 1.1 g of 60% sodium hydride (oily) at 0° C. The mixture was stirred at 0° C. for 30 minutes and at room temperature for 1 hour. Then, water was added to the reaction mixture and the mixture was extracted with ethyl acetate. The organic layer was dried over magnesium sulfate and concentrated under reduced pressure. The residue was subjected to silica gel column chromatography to obtain 2.9 g of 2-propynyl 3,5-difluoro-4-(2-propynyloxy)benzoate represented by the formula:
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