Patent ID: 8148443

Claim:
An Oxonium salt having [(R o ) 3 O] + cations or sulfonium salt having [(R o ) 3 S] + cations, where R o denotes straight-chain or branched alkyl group having 1-8 C atoms or unsubstituted phenyl or phenyl which is substituted by R o , OR o , N(R o ) 2 , CN or halogen, and for the oxonium salt anions selected from the group consisting of [PF x (C y F 2y+1−z H z ) 6−x ] − anions, where 2<x<5, 1<y<8 and 0<z<2y+1, or anions selected from the group consisting of [(BF n (CN) 4−n ] − anions, where n=0, 1, 2 or 3, or anions selected from the group consisting of [(R f1 SO 2 ) 2 N] − anions, where R f1 denotes F or perfluorinated straight-chain or branched alkyl having 1-20 C atoms, perfluorinated straight-chain or branched alkenyl having 2-20 C atoms and one or more double bonds, perfluorinated straight-chain or branched alkynyl having 2-20 C atoms and one or more triple bonds, perfluorinated, saturated, partially unsaturated or fully unsaturated cycloalkyl having 3-7 C atoms, which may be substituted by perfluoroalkyl groups, or anions selected from the group consisting of [BF w R f2 4−w ] − anions, where w=0, 1, 2 or 3, where R f2 denotes perfluorinated straight-chain or branched alkyl having 1-20 C atoms, perfluorinated straight-chain or branched alkenyl having 2-20 C atoms and one or more double bonds, perfluorinated straight-chain or branched alkynyl having 2-20 C atoms and one or more triple bonds, perfluorinated, saturated, partially unsaturated or fully unsaturated cycloalkyl having 3-7 C atoms, which may be substituted by perfluoroalkyl groups, where R f1 or R f2 may in each case be identical or different, where a pair of R f1 or a pair of R f2 may be connected to one another by single or double bonds, and where, in R f1 or R f2 , one or two non-adjacent carbon atoms of which are not in the α-position to the heteroatom may be replaced by atoms and/or atom groups selected from the group consisting of —O—, —SO 2 — and —NR′— or by the end group —SO 2 X′, where R′=non-, partially- or per-fluorinated C 1 - to C 6 -alkyl, C 3 - to C 7 -cycloalkyl, unsubstituted or substituted phenyl, or an unsubstituted or substituted heterocycle, and X′=F, Cl or Br, and for the sulfonium salt anions selected from the group consisting of [(BF n (CN) 4−n ] − anions, where n=0, 1, 2 or 3.