Perfluorobutane-1,4-disulfonic acid potassium salt → 1,4-Butanedisulfonic acid, 1,1,2,2,3,3,4,4-octafluoro-

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Reaction Steps

Perfluorobutane-1,4-bis-sulphonate dipotassium salt (15 g, 34.2 mmol) was dissolved in hot water (100 ml). It was added to an ion exchange column of Amberlyst 15 resin, (40×4 cm) which had been previously washed with excess 6N HCl and rinsed with distilled water. The column was then washed slowly with distilled water, and the first 300 ml of aqueous solution collected. The solution was concentrated in vacuum and the residue was dried under reduced pressure at 80° C. to afford perfluorobutane-1,4-bis-sulphonic acid. (11.0 g, 30 mmol, 88%)

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