Process for the preparation of bis(perfluoroalkyl)phosphinic acids and salts thereof

US7202379B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Urs Welz-Biermann · Mannheim, DE
• Nikolai (Mykola) Ignatyev · Duisburg, DE
• Michael Weiden · Darmstadt, DE
• Udo Heider · Riedstadt, DE
• Andri Kucheryna · Duisburg, DE
• Helge Willner · Neheim, DE
• Peter Sartori · Rheinberg, DE

Key dates

• Filing date: Mar 17, 2003
• Grant date: Apr 10, 2007
• Expiry date: Sep 16, 2023

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09K23/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The present invention relates to a process for the preparation of bis(perfluoroalkyl)phosphinic acids comprising at least the reaction of at least one difluorotris(perfluoroalkyl)phosphorane or at least one trifluorobis(perfluoroalkyl)phosphorane with hydrogen fluoride in a suitable reaction medium, and heating of the resultant reaction mixture. The invention also relates to salts of bis(perfluoroalkyl)phosphinic acids and to the use thereof.