Patent ID: 7692007
Filing Date: 2010-04-06
Classification: C07D

Abstract:
1. A process for preparation of an onium salt having a low chloride content, said process comprising: reacting an onium chloride with an acid resulting in formation of hydrochloric acid, wherein the hydrochloric acid formed is removed by azeotropic distillation by coordination to 1,4-dioxane which forms an azeotropic mixture with water; wherein said onium chloride is of formulas (1), (2), (3), (4), or (5): wherein R is in each case, independently of one another, H, wherein all substituents R are not simultaneously H, 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, or saturated, partially or fully unsaturated cycloalkyl having 3-7 C atoms, which is optionally substituted by alkyl groups having 1-6 C atoms, where one or more R groups is optionally partially or fully substituted by halogens, or partially substituted by —NO where, in the R, one or two non-adjacent carbon atoms which are not in the α-position are optionally replaced by atoms and/or atom groups selected from —O—, —S—, —S(O)—, —SO R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , and R 7 are each, independently of one another, hydrogen, where hydrogen is excluded for R straight-chain or branched alkyl having 1 to 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, or saturated, partially or fully unsaturated cycloalkyl having 3-7 C atoms, which is optionally substituted by alkyl groups having 1-6 C atoms, where one or more of the substituents R where, in the substituents R HetN + is a heterocyclic cation selected from and R 1 ′ to R 4 ′ are each, independently of one another, hydrogen, 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, saturated, partially or fully unsaturated cycloalkyl having 3-7 C atoms, which is optionally substituted by alkyl groups having 1-6 C atoms, saturated, partially or fully unsaturated heteroaryl, or heteroaryl-C where one or more of R where, in R wherein in the guanidinium cation [C(NR wherein in the thiouronium cation [(R with the proviso that compounds of the formulae (1) and (2) in which all of the substituents R are fully substituted by halogens or in which three of the substituents R are fully substituted by halogens are excluded.