Process for the crystallisation of guandinium salts

US7629493B2 · kind B2 · utility

Assignee

• Merck Patent GmbH · DE

Inventors

• Michael Kirschbaum · Weiterstadt, DE
• Ekkehard Bartmann · Langen (Hessen), DE
• Dieter Bensinger · Darmstadt, DE
• Alexander Haas · Darmstadt, DE
• Ricky Lippert · Brensbach, DE

Key dates

• Filing date: Apr 10, 2004
• Grant date: Dec 8, 2009
• Expiry date: Apr 1, 2025

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D307/68
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

The invention relates to a process for the crystallization of the compounds of the formula (I) or acid-addition salts thereof, in which R1, R2 and R3 have the meaning indicated in Claim 1.