反应详情

温度

60 °C

90 cm3 (0.24 mol) of a 20% strength solution of butyllithium in toluene were added at room temperature under argon to a solution of 50 g (0.24 mol) of 3 in 500 ml of THF. The mixture was stirred at 60° C. for 2 hours, and cooled to -78° C., 22.5 g (0.12 mol) of dibromoethane were added, and the mixture was warmed to room temperature over the course of 18 hours. The reaction mixture was washed with 50 cm3 of H2O, the solvent was removed in vacuo, and the residue was chromatographed on 500 g of silica gel (hexane/methylene chloride 9:1), giving 2.5 g (5%) of 32 as a yellow oil which solidified slowly at -20° C.

1. temperaturecooled to -78° C.
2. temperaturethe mixture was warmed to room temperature over the course of 18 hours
3. washThe reaction mixture was washed with 50 cm3 of H2O
4. customthe solvent was removed in vacuo
5. customthe residue was chromatographed on 500 g of silica gel (hexane/methylene chloride 9:1)