Method for producing salts having monofluoro-tricyanoborate anions

摘要

The invention relates to a method for producing alkali metal salts having monofluoro-tricyanoborate anions from alkali metal tetrafluoroborates.

主权项

1. Process for the preparation of compounds of the formula I
[Me ]+[BF(CN)3]−  I, where Me denotes an alkali metal, by reaction of a compound of the formula II
[Me1]+[BFn(CN)4—n]−  II, where Me1 denotes an alkali metal, which may be identical to or different from Me and n denotes 2, 3 or 4, with a trialkylsilyl cyanide in the presence of a trialkylsilyl chloride, trialkylsilyl bromide and/or trialkylsilyl iodide, where the alkyl groups of the trialkylsilyl cyanide or trialkylsilyl halide in each case, independently of one another, denote a linear or branched alkyl group having 1 to 10 C atoms, where the conditions of the reaction are selected in such a way that both the water content and also the oxygen content are a maximum of 1,000 ppm, and subsequent metal cation exchange in the case where Me1 does not correspond to Me.