Process for preparing perfluorinated ethers

US3985810A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Sigmar-Peter von Halasz · Kelkheim, DE
• Friedhelm Kluge · Frankfurt am Main, DE

Key dates

• Filing date: Oct 28, 1975
• Grant date: Oct 12, 1976
• Expiry date: Oct 28, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C10N2040/17
• WIPO field: Basic materials chemistry
• WIPO sector: Chemistry

Abstract

Perfluorinated ethers containing carboxylic acid fluoride groups and optionally units derived from hexafluoropropene epoxide or tetrafluoroethylene epoxide are reacted with fluorine at temperatures of from 50.degree. to 350.degree.C in the presence of metallic catalysts. During the reaction carbonyl difluoride is splitt off and an ether is obtained in high yield which is free of carboxylic acid fluoride groups. Metallic silver is well suited as catalyst.