Br[Si:2]([CH3:5])([CH3:4])[CH3:3].C([O:8][P:9]([C:14]1[CH:19]=[CH:18][C:17]([F:20])=[CH:16][CH:15]=1)(=[O:13])[O:10]CC)C>>[CH3:3][Si:2]([O:8][P:9]([C:14]1[CH:19]=[CH:18][C:17]([F:20])=[CH:16][CH:15]=1)(=[O:13])[O:10][Si:2]([CH3:5])([CH3:4])[CH3:3])([CH3:5])[CH3:4]Bromotrimethylsilane (15.3 mL, 0.116 mol) was added dropwise to 4-fluorophenyl-phosphonic acid diethyl ester (8.95 g, 38.58 mmol) stirred in a reaction flask chilled to 0° C. The resulting solution was allowed to warm to ambient temperature and stirred for an additional hour. The mixture was then concentrated by rotary evaporation yielding crude 4-fluorophenyl-phosphonic acid bis(trimethylsilyl) ester which was used in the next step without further purification.
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