O-Cresol → tert-Butyl-dimethyl-o-tolyloxy-silane

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Reaction Steps

Add TBDMSCl (4.6 g, 30.5 mmol) to a solution of o-cresol (3 g, 28 mmol) and imidazole (2.08 g, 30.5 mmol) in 25 ml of dry DMF and stir at room temperature. After 7 h, pour the reaction into H2O and extract with hexane twice. Combine the organic layers, wash with H2O, dry over Na2SO4, filter and concentrate under reduced pressure to give a residue. Purify the residue by column chromatography on silica gel eluting with hexane to afford pure (1,1-dimethylethyl)dimethyl(2-methylphenoxy)silane as colourless oil. Add AIBN (330 mg, 1.98 mmol) to a solution of NBS (3.87 g, 21.76 mmol) and (1,1-dimethylethyl)dimethyl(2-methylphenoxy)silane (4.4 g, 19.78 mmol) in 100 ml of CCl4 and stir at reflux for 6 h. Concentrate the solvent under reduced pressure, add hexane and filter the solid. Wash the hexane with a saturated aqueous solution of NaHCO3 and H2O. Dry the organic phase over Na2SO4, filter and concentrate under reduced pressure to obtain [2-(bromomethyl)phenoxy](1,1-dimethylethyl)dimethylsilane as colourless oil.

Provenance & Evidence