Patent ID: 6911561

Claim:
A method of making an acidic composition comprising a perfluorinated peroxide of the formula R f C(O)OOC(O)R f , the method comprising combining (a) a perfluorinated anhydride of the formula R f C(O)OC(O)R f with (b) hydrogen peroxide and a catalytic amount of (c) a Group 1, 2, or 13 metal oxide, a Group 1, 2, or 13 metal hydroxide, a Group 1, 2, or 13 metal alcoholate, or a combination thereof, to form the acidic composition comprising the perfluorinated peroxide of the formula R f C(O)OOC(O)R f , wherein each R f group is independently a perfluorinated aromatic or aliphatic group, or combinations thereof, optionally including oxygen atoms, and a perfluorinated acid formed in situ; with the proviso that the method does not comprise combining a metal peroxide with (a), (b), or (c), or forming a metal peroxide in situ.