Process for the preparation of perfluoroalkylcyano- or perfluoroalkylcyanofluoroborates

摘要

The invention relates to a process for the preparation of salts having perfluoroalkyltricyano- or perfluoroalkylcyanofluoroborate anions, ((per)fluoro)phenyltricyano- or ((per)fluoro)phenylcyanofluoroborate anions, phenyltricyanoborate anions which are mono- or disubstituted by perfluoroalkyl groups having 1 to 4 C atoms or phenylcyanofluoroborate anions which are mono- or disubstituted by perfluoroalkyl groups having 1 to 4 C atoms, by reaction of alkali metal trifluoroperfluoroalkylborate with trialkylsilyl cyanide and a subsequent salt-exchange reaction or by direct reaction of an organic trifluoroperfluoroalkyl borate with trialkylsilyl cyanide.

主权项

1. A salt of formula III
Ma+[B(Rf)(CN)x(F)y]a−  III, where Ma+ is a lithium, potassium, sodium, caesium or rubidium salt, Rf denotes a linear or branched perfluorinated alkyl group having 1 to 4 C atoms, C6F5, C6H5, partially fluorinated phenyl, or phenyl which is mono- or disubstituted by a perfluoroalkyl group having 1 to 4 C atoms, where the perfluoroalkyl group is selected independently of one another, a is 1, x is 1, 2 or 3, y is 0, 1 or 2, where 0 is excluded for Rf=C6H5, and x+y is 3.