反应详情

温度

50 °C

20.2 g of 4,5,6,7-tetrahydro-α,4,4,7,7-pentamethylbenzo[b]thiophene-methanol are dissolved in 260 ml of acetonitrile and the solution is treated with 29.2 g of triphenylphosphonium bromide. After stirring at 50° C. for 3 hours, the mixture is evaporated to dryness, the residue is taken up with 80% aqueous ethanol and extracted twice with hexane. The ethanol phase is evaporated, the residue is dissolved in methylene chloride, the solution is dried over sodium sulphate and evaporated. There are obtained 49.4 g of [1-(4,5,6,7-tetrahydro-4,4,7,7-tetramethylbenzo-[b]thien-2-yl)ethyl]triphenylphosphonium bromide as an amorphous white powder.

1. customthe mixture is evaporated to dryness
2. extractionextracted twice with hexane
3. customThe ethanol phase is evaporated
4. dissolutionthe residue is dissolved in methylene chloride
5. dry with materialthe solution is dried over sodium sulphate
6. customevaporated