Imidazole → [4-(Bromomethyl)-phenoxy][tris(1-methylethyl)]silane

Participants

Reaction Conditions

Reaction Steps

To a solution of (4-{[tris(1-methylethyl)silyl]oxy}phenyl)methanol (Step 2, 1.0 g, 3.56 mmol) in diethyl ether (20 mL) and acetonitrile (7.5 mL) was added triphenylphosphine (0.94 g, 3.57 mmol) and imidazole (243 mg, 3.57 mmol). After being cooled to 0° C., a solution of bromine (184 μL, 3.56 mmol) in diethyl ether (2.5 mL) was added dropwise. The reaction mixture was stirred at rt over night. Then water was added, and it was extracted with ethyl acetate. The organic extract was washed with water and brine, dried over anhydrous magnesium sulfate and filtered. After evaporation of the solvent, the crude material was treated with pentane. Precipitated triphenylphosphine oxide (TPPO) was removed by filtration. The solvent was evaporated in vacuo. The product thus obtained (1.42 g) still contained some TPPO (as judged by tlc) but was used for subsequent reactions without further purification.

Provenance & Evidence