[CH3:1][Si:2]([CH3:7])([CH3:6])[C:3]#[C:4][CH3:5].[Li]CCCC.CCCCCC.Br[CH2:20][C:21]#[C:22][C:23]1[CH:28]=[CH:27][C:26]([F:29])=[CH:25][CH:24]=1>C1COCC1>[F:29][C:26]1[CH:27]=[CH:28][C:23]([C:22]#[C:21][CH2:20][CH2:5][C:4]#[C:3][Si:2]([CH3:7])([CH3:6])[CH3:1])=[CH:24][CH:25]=1To a solution of trimethyl(prop-1-ynyl)silane (2.19 g, 19.50 mmol) in 22 mL of THF at −78° C., was added dropwise n-BuLi 2.5M in hexane (7.8 mL, 20 mmol). After stirring 2 hours at −78° C., 1-(3-bromoprop-1-ynyl)-4-fluorobenzene (1.40 g, 6.5 mmol) in 6 mL of THF was slowly added and the resulting mixture was stirred for 1 h at −78° C. and warmed to room temperature for an additional 1 h. The reaction mixture was quenched with water and extracted with ethyl acetate. The organic layer was dried over MgSO4, filtered and concentrated to afford 1.57 g of (6-(4-fluorophenyl)hexa-1,5-diynyl)trimethylsilane (99%) as a yellow oil.
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