Process for the preparation of bis(perfluoroalkyl)phosphinic acids and salts thereof
AssigneeMerck Patent GmbH
InventorsUrs Welz-Biermann, Nikolai Ignatyev, Michael Weiden, Udo Heider, Andri Kucheryna, Helge Willner, Peter Sartori
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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.
Claims18
A process for the preparation of a bis(perfluoroalkyl)phosphinic acid or salt comprising:
- a) reaction of at least one difluorotris(perfluoroalkyl)phosphorane or at least one trifluorobis(perfluoroalkyl)phosphorane with hydrogen fluoride in a reaction medium, and
- b) heating of the reaction mixture obtained in a).
A salt of a bis(perfluoroalkyl)phosphinic acid that is partially alkylated or peralkylated phosphonium, sulfonium, pyridinium, pyridazinium, pyrimidinium, pyrazinium, imidazolium, pyrazolium, oxazolium or triazolium.
Dependencies are inferred from the claim text.