Process for the preparation of perfluoropolyetheracyl fluorides
AssigneeHoechst Aktiengesellschaft
InventorMatthias Meyer
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Abstract
A process for the preparation of perfluoropolyetheracyl fluorides of formula (I) F.sub.3 C(CF.sub.2).sub.2 --O--[CF(CF.sub.3)CF.sub.2 --O--].sub.n CF(CF.sub.3)COF (I) in which n is an integer from 0-60, wherein hexafluoropropylene oxide is oligomerized in the presence of CsF and a polyethylene glycol dimethyl ether and the reaction mixture thus formed is reacted with at least one of the halogen compounds HCl, HBr, BCl.sub.3, PCl.sub.3, SCl.sub.2 and R.sub.m SiCl.sub.4-m, where m=0, 1, 2 or 3 and R=C.sub.1 -C.sub.3 -alkyl or phenyl, dissolved in an aprotic solvent.
Claims6
A process for the preparation of perfluoropolyetheracyl fluorides of formula (I)
- F.sub.3 C(CF.sub.2).sub.2 --O--[CF(CF.sub.3)CF.sub.2 --O--].sub.n CF(CF.sub.3)COF (I)
- in which n is an integer from 0-60, wherein hexafluoropropylene oxide is oligomerized in the presence of CsF and a polyethylene glycol dimethyl ether and the reaction mixture thus formed is reacted with at least one of the halogen compounds HCl, HBr, BCl.sub.3, PCl.sub.3, SCl.sub.2 and R.sub.m SiCl.sub.4-m, where m=0, 1, 2 or 3 and R=C.sub.1 -C.sub.3 -alkyl or phenyl, dissolved in an aprotic solvent, and the resulting cesium halide precipitate is removed from the purified perfluoropolyetheracyl fluorides of formula (I).
Dependencies are inferred from the claim text.