[F:1][C:2]1[C:7]([Si](C)(C)C)=[C:6]([F:12])[C:5]([F:13])=[C:4]([CH3:14])[C:3]=1[C:15]1[O:16][CH2:17][C:18]([CH3:21])([CH3:20])[N:19]=1.[F-].[Cs+].CN(C)C=O>O>[F:1][C:2]1[CH:7]=[C:6]([F:12])[C:5]([F:13])=[C:4]([CH3:14])[C:3]=1[C:15]1[O:16][CH2:17][C:18]([CH3:21])([CH3:20])[N:19]=1A solution of 12.0 g (38.0 mmol) of 2-[2,4,5-trifluoro-6-methyl-3-(trimethylsilyl)phenyl]-4,4-dimethyl-2-oxazoline, 5.85 g (38.5 mmol) of cesium fluoride, 110 ml of dimethylformamide, and 15 ml of water was stirred for 18 hours at room temperature. The reaction mixture was poured into water and extracted with ethyl acetate; the organic phase was washed with water, dried over magnesium sulfate, and concentrated to give 9.1 g of liquid.
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