反应详情

温度

-90 °C

20.0 ml of TMEDA were dissolved in 150 ml of THF (anhydrous) and, at a temperature between −80° C. and −90° C., 93.0 ml of a 1.25M solution of sec-BuLi in cyclohexane were added. Then, at a temperature between −87° C. and −93° C., a solution of 4-pentafluorosulfanylbenzoic acid (example 2a) in 50 ml of THF (anhydrous) was added dropwise over the course of 35 minutes, After stirring at −90° C. for 2 hours, 38.2 g of 1,1,1,2,2,2-hexachloroethane in 60 ml of THF (anhydrous) were added dropwise at −90° C. The mixture was allowed to warm to −70° C., and then 100 ml of water were added dropwise. The solvent was removed in vacuo, and the residue was chromatographed on silica gel with DIP/2% HOAc. 5.0 g of the desired product were obtained as a partly crystallizing oil.

1. additionwere added
2. temperatureto warm to −70° C.
3. customThe solvent was removed in vacuo
4. customthe residue was chromatographed on silica gel with DIP/2% HOAc