Patent Number: 7,202,379

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

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.

Inventors: Welz-Biermann; Urs (Heppenheim, DE), Ignatyev; Nikolai (Duisburg, DE), Weiden; Michael (Darmstadt, DE), Heider; Udo (Winchester, GB), Kucheryna; Andri (Duisburg, DE), Willner; Helge (Muehlheim/Ruhr, DE), Sartori; Peter (Utting, DE)

Assignee: Merck Patent GmbH

International Classification: C07F 9/22 (20060101)

Expiration Date: 2019-04-10 0:00:00