反应详情

To a 3-necked 1 L round bottom flask equipped with a still head was added phenylmagnesium bromide (3 M in diethyl ether, 142 ml, 0.426 mol) followed by dry benzene (150 ml). The flask was connected to a water aspirator and the diethyl ether removed under vacuo by gently heating. Additional benzene (150 ml) was added and the solution brought to a gentle reflux under nitrogen. A solution of phenyl sulfoxide (17.23 g, 85.2 mmol) in benzene (100 ml) was added dropwise over 1.5 hours. Once the addition was complete, the reaction mixture was heated at a gentle reflux for 3 hours. The reaction mixture was cooled (ice bath temperature) while adding a solution of hydrobromic acid (25%, 200 ml). The resulting biphasic mixture was stirred at room temperature overnight. After separation of the layers, the organic layer extracted were combined and extracted with dichloromethane (200 ml), dried (MgSO4 ) and concentrated in vacuo to give the crude product as an off-white solid (14.50 g). The solid was taken up in the minimum mount of warm dichloromethane (100 ml) and four times the volume of ether added to precipitate the salt. The suspension was cooled in an ice bath for 1 hour prior to collecting the salt and washing with ether. In this way, triphenylsulfonium bromide was isolated as a white solid (14.40 g, 49%).

1. customTo a 3-necked 1 L round bottom flask equipped with a still head
2. customthe diethyl ether removed under vacuo
3. temperatureby gently heating
4. additionAdditional benzene (150 ml) was added
5. temperaturea gentle reflux under nitrogen
6. additionOnce the addition
7. temperaturethe reaction mixture was heated at
8. temperaturea gentle reflux for 3 hours
9. temperatureThe reaction mixture was cooled (ice bath temperature)
10. customAfter separation of the layers
11. extractionthe organic layer extracted
12. extractionextracted with dichloromethane (200 ml)
13. dry with materialdried (MgSO4 )
14. concentrationconcentrated in vacuo
15. customto give the crude product as an off-white solid (14.50 g)
16. additionadded
17. customto precipitate the salt
18. temperatureThe suspension was cooled in an ice bath for 1 hour
19. customto collecting the salt
20. washwashing with ether