反应详情

400 ml of dimethylformamide, 31.18 g of imidazole and 125.89 g of 1,1-dimethyl-ethyl-diphenyl-chlorosilane are added under an inert atmosphere and at ambient temperature to 80.89 g of parabromophenol, then the solution obtained is agitated for 2 hours. The reaction medium is poured into 2 liters of water, precipitation is observed, the solid is solubilized with ethyl acetate and the aqueous phase is extracted with ethyl acetate, the combined organic phases are dried and evaporated under reduced pressure until an oil is obtained. Pentane is added and crystallization is observed. After filtration and drying the precipitate 179.24 g of expected product is obtained. RF: 0.53 (thin layer chromatography, support: silica, eluant cyclohexane/AcOEt 95/5).

1. customthe solution obtained
2. extractionthe aqueous phase is extracted with ethyl acetate
3. customthe combined organic phases are dried
4. customevaporated under reduced pressure until an oil
5. customis obtained
6. customcrystallization
7. filtrationAfter filtration
8. dry with materialdrying the precipitate 179.24 g of expected product
9. customis obtained