Patent ID: 7999111

Claim:
A process for the preparation of an onium alkylsulfonate, comprising reacting an onium halide or carboxylate with a symmetrically substituted dialkyl sulfite or with an asymmetrically substituted dialkyl sulfite at temperatures of 50 to 170° C., whereby the onium alkylsulfonate is produced, wherein the halide is an ammonium halide, phosphonium halide, thiouronium halide, guanidinium halide or a halide with a heterocyclic cation, wherein the halide with a heterocyclic cation has formula (4) [HetN] + Hal − (4), where Hal denotes Cl, Br or I, HetN + denotes a heterocyclic cation of the formula R 1 ′ to R 4 ′ each, independently of one another, denote 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 containing alkyl groups having 1-4 C atoms, which, however, 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 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, Cl and/or Br, but where R 1′ and R 4′ are not simultaneously CN or cannot simultaneously be fully substituted by F or other halogens, where the substituents R 2′ and R 3′ may be partially or fully substituted by F, Cl and/or Br, 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 —O—, —C(O)—, —S—, —S(O)— or —SO 2 —, where the halides are selected from the group consisting of chlorides, bromides, iodides, and uronium iodide.