C[Si](C)(C)[O:3][C:4]1([C:14]([F:17])([F:16])[F:15])[CH2:13][CH2:12][C:7]2([O:11][CH2:10][CH2:9][O:8]2)[CH2:6][CH2:5]1.O>[F-].C([N+](CCCC)(CCCC)CCCC)CCC.O1CCCC1>[F:17][C:14]([F:15])([F:16])[C:4]1([OH:3])[CH2:5][CH2:6][C:7]2([O:8][CH2:9][CH2:10][O:11]2)[CH2:12][CH2:13]1At 0° C., 12.20 g (40.89 mmol) of trimethyl {[8-(trifluoromethyl)-1,4-dioxaspiro[4.5]dec-8-yl]oxy}silane (Example 5A) were dissolved in 164 ml of 1 molar tetrabutylammonium fluoride solution in tetrahydrofuran, and the mixture was stirred at room temperature for 3 hours. For work-up, about 600 ml of water were added to the reaction, and the target molecule was extracted with dichloromethane. The organic phase was washed repeatedly with water, dried over sodium sulphate and concentrated under reduced pressure. Drying gave 9.33 g (100% of theory) of the title compound as a brownish oil.
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