Hydrochloric Acid → Triphenylsulfonium 1,1-difluoro-2-hydroxyethanesulfonate

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Reaction Steps

In 200 g of methanol was dissolved 50.9 g (0.1 mole) of triphenylsulfonium 2-(pivaloyloxy)-1,1-difluoroethane-sulfonate. To this solution under ice cooling, 2.0 g of a 28 wt % methanol solution of sodium methoxide was added. The reaction solution was allowed to mature at room temperature for 24 hours, and 1.0 g of 12N hydrochloric acid was added thereto at a temperature below 10° C. to quench the reaction. The methanol was distilled off in vacuum. To the residue was added 250 g of dichloromethane. After the inorganic salt was filtered off, the filtrate was concentrated. Diisopropyl ether, 150 g, was added to the concentrate for crystallization. The crystals were filtered and dried, obtaining the target compound (PAG1), 42 g (purity 99%, net yield 99%).

Provenance & Evidence