Diphenyl sulfoxide → Diphenyl(5,7-diethylthioxanthene-9-one-2-yl)sulfonium trifluoromethanesulfonate

Participants

Reaction Steps

To 320 ml of dichloromethane were dissolved 20.2 g (0.1 mol) of diphenylsulfoxide and 26.8 g (0.1 mol) of 2,4-diethylthioxanthene-9-one, and 28.2 g (0.1 mol) of trifluoromethanesulfonic anhydride was added dropwise thereto at −70 to −60° C., followed by gradually warming to room temperature and reacting with stirring for 4 hours. After completion of the reaction, the obtained reaction solution was washed with water (160 ml×4 times) and concentrated under reduced pressure. The obtained crude product was purified by column chromatography to obtain 38.6 g of objective substance as yellow glassy substance (yield: 64%).

Provenance & Evidence