Process for preparing perfluorinated bromoalkanes, or perfluorinated bromoalkanes containing ether groups

US5328571A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventor

• Hans Millauer · Eschborn, DE

Key dates

• Filing date: Sep 9, 1993
• Grant date: Jul 12, 1994
• Expiry date: Sep 9, 2013

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07C19/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Perfluorinated bromoalkanes of the formula EQU X--(CF.sub.2).sub.p --Br (I), in which X is hydrogen or fluorine and p is an integer from 2 to 10, or perfluorinated bromoalkanes which contain ether groups, of the formula ##STR1## in which q is zero or an integer from 1 to 4, are obtained by electrolytic decarboxylation of a perfluorinated alkanecarboxylic acid of the formula EQU X--(CF.sub.2).sub.p --COOH (II), in which X is hydrogen or fluorine and p is an integer from 2 to 10, or an alkanecarboxylic acid which contains ether groups, of the formula ##STR2## in which q is zero or an integer from 1 to 4. The electrolytic decarboxylation is carried out in an aqueous electrolyte in the presence of bromine and an aliphatic nitrile.