反应详情

300.2 g of 3-(p-tert.butyl-phenyl)-2-methyl-propanol are added dropwise over a period of 2 hours at 20°-30° C. to 218.6 g of phosphorus tribromide and the mixture is left to stand for 16 hours. The mixture is subsequently heated to 55°-60° C. over a period of 1.5 hours, cooled to ca 10° C. and cautiously poured on to ice. The aqueous solution is exhaustively extracted with ether, the combined ether phases are washed with saturated sodium bicarbonate solution and water, dried over sodium sulphate and evaporated. By fraction distillation there is obtained pure 3-(p-tert.butyl-phenyl)-2-methyl-propyl bromide of boiling point 104° C./0.025 Torr.

1. waitthe mixture is left
2. temperatureThe mixture is subsequently heated to 55°-60° C. over a period of 1.5 hours
3. temperaturecooled to ca 10° C.
4. additioncautiously poured on to ice
5. extractionThe aqueous solution is exhaustively extracted with ether
6. washthe combined ether phases are washed with saturated sodium bicarbonate solution and water
7. dry with materialdried over sodium sulphate
8. customevaporated
9. distillationBy fraction distillation