Patent ID: 8101749

Claim:
A process for preparing an onium tetrafluoroborate, comprising reacting an onium halide with a trialkyloxonium tetrafluoroborate, trialkylsulfonium tetrafluoroborate or triphenylcarbonium tetrafluoroborate, wherein the halide is of formula (4) [HetN] + Hal − (4) where Hal denotes Cl, Br or I, and HetN + denotes a heterocyclic cation selected from the group consisting of where R 1 ′ to R 4 ′ each, independently of one another, denotes hydrogen or CN, straight-chain or branched alkyl having 1-20 C atoms, straight-chain or branched alkenyl having 2-20 C atoms and one or more double bonds, straight-chain or branched alkynyl having 2-20 C atoms and one or more triple bonds, dialkylamino having alkyl groups having 1-4 C atoms, but which is not bonded to the heteroatom of the heterocycle, saturated, partially or fully unsaturated cycloalkyl having 3-7 C atoms, which may be substituted by one or more alkyl groups having 1-6 C atoms, or aryl-C 1 -C 6 -alkyl, where the substituents R 1 ′ and R 4 ′ may be partially or fully substituted by F, but where R 1 ′ and R 4 ′ are not simultaneously CN or must not simultaneously be fully substituted by F, where the substituents R 2 ′ and R 3 ′ may be partially or fully substituted by halogens or partially by NO 2 or CN, and where, in the substituents R 1 ′ to R 4 ′, one or two non-adjacent carbon atoms which are not bonded directly to the heteroatom and are not in the ω-position may be replaced by atoms and/or atom groups —O—, —S—, —S(O)— or —SO 2 —.