反应详情

A solution of 1-bromo-3-(3-methyl-but-2-enylsulfanyl)-benzene (5.651 g, 22 mmole) in 100 mL of toluene was treated with 5.433 g of p-toluenesulfonic acid monohydrate and heated at reflux for 15 hours. The mixture was diluted with 100 mL of water, neutralized with solid sodium bicarbonate and extracted with two 100 mL portions of ethyl acetate. The organic phase was dried over MgSO4, filtered and concentrated in vacuo to give a yellow oil. The product was purified by short path distillation (T=190° C. at 1.08 Torr) to give 4.902 g of 7-bromo-4,4-dimethyl-thiochroman as a pale yellow oil, which contained approximately 20% 5-bromo-4,4-dimethyl-thiochroman.

1. temperatureheated
2. temperatureat reflux for 15 hours
3. extractionextracted with two 100 mL portions of ethyl acetate
4. dry with materialThe organic phase was dried over MgSO4
5. filtrationfiltered
6. concentrationconcentrated in vacuo
7. customto give a yellow oil
8. distillationThe product was purified by short path distillation (T=190° C. at 1.08 Torr)