Patent ID: 8268947

Claim:
A process for preparing compounds of formula (III-A) and (III-B): said process comprising: (1) manufacturing compounds of formula (I-A) and (I-B): by reaction of perfluoroallylfluorosulfate (FAFS) of formula: with at least one hypofluorite of formula (II-A) or (II-B): (2) converting compounds of formulae (I-A) and (I-B) as above detailed to corresponding acyl fluorides of formulae respectively (III-A) and (III-B) wherein: R F in formulae (I-A), (II-A) and (IIIA) is a monovalent fluorocarbon C 1 -C 20 group, optionally comprising oxygen catenary atoms, optionally comprising functional groups comprising heteroatoms; and R′ F in formulae (I-B), (II-B) and (III-B) is a divalent fluorocarbon C 1 -C 6 group.