C([Si]([O:8][C:9]1[CH:14]=[CH:13][C:12]([CH2:15][CH2:16][C:17]([CH3:36])=[CH:18][C:19]2[CH:24]=[CH:23][C:22]([O:25][Si](C(C)(C)C)(C)C)=[C:21]([O:33][CH2:34][CH3:35])[CH:20]=2)=[CH:11][CH:10]=1)(C)C)(C)(C)C.[N+](CCCC)(CCCC)(CCCC)CCCC.[F-].O>C1COCC1>[CH2:34]([O:33][C:21]1[CH:20]=[C:19]([CH:18]=[C:17]([CH3:36])[CH2:16][CH2:15][C:12]2[CH:11]=[CH:10][C:9]([OH:8])=[CH:14][CH:13]=2)[CH:24]=[CH:23][C:22]=1[OH:25])[CH3:35]tert-Butyl(4-(4-(4-((tert-butyldimethylsilyl)oxy)-3-ethoxyphenyl)-3-methylbut-3-en-1-yl)phenoxy)dimethylsilane was dissolved in THF (30 mL), n-Bu4NF (30 mL, 30.0 mmol, 0.7 equiv., 1.0 M in THF) was added, and the mixture was stirred at 25° C. for 1 h. After addition of H2O, the aqueous layer was extracted with MTBE (2×), the combined organic phases were washed with brine, dried (MgSO4), filtered and the filtrate was concentrated. The residue was purified by flash chromatography on SiO2 (cyclohexane/EtOAc 9:1→4:1) to yield 5.87 g (48% over 2 steps) of the title compound as a light yellow oil.
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