Ketene → Trifluoromethanesulfonic anhydride

This invention pertains to a process for the preparation of trifluoromethanesulfonic acid anhydride (triflic anhydride) by the disproportionation of a mixed anhydride comprising a trifluoromethane-sulfonyl acyl residue and a carboxyl residue. More particularly, this invention pertains to a process for the preparation of trifluoromethane-sulfonic acid anhydride by the steps of (1) forming a mixed anhydride comprising a trifluoromethanesulfonyl acyl residue and a carboxyl residue by contacting trifluoromethanesulfonic acid or a derivative thereof with a carboxyl compound selected from ketene, dialkyl ketenes, carboxylic acids, and derivatives of carboxylic acids and (2) subjecting the mixed anhydride to reactive distillation wherein the mixed anhydride undergoes disproportionation to produce triflic anhydride and a higher boiling carboxylic acid anhydride.

1. distillationdistillation wherein the mixed anhydride

ORD record

ord-1cc0511437824e41bc79ec6336676ab3

Source dataset

uspto-grants-2002_10

DOI

10.6084/m9.figshare.5104873.v1

Patent number

US06469206B2