Process for the preparation of onium salts having a low chloride content

US7692007B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Nikolai (Mykola) Ignatyev · Duisburg, DE
• Urs Welz-Biermann · Mannheim, DE
• Peter Barthen · Rheinberg, DE
• Helge Willner · Neheim, DE

Key dates

• Filing date: Jun 17, 2005
• Grant date: Apr 6, 2010
• Expiry date: Dec 2, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D213/06
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the preparation of onium salts having a low chloride content by reaction of an onium chloride with an acid, where the hydrochloric acid forming is removed by azeotropic distillation by coordination to an organic solvent which forms an azeotropic mixture with water.