Method for the chemical racemization of 5-monosubstituted hydantoins by contact with anionic ion exchanger

US5449786A · kind A · utility

Assignee

• Degussa AG · DE

Inventors

• Fritz Wagner · Kronach, DE
• Christoph Syldatk · Hildesheim, DE
• Markus Pietzsch · Stuttgart, DE

Key dates

• Filing date: Nov 16, 1992
• Grant date: Sep 12, 1995
• Expiry date: Nov 16, 2012

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D233/78
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

A method for the racemization of 5-monosubstituted hydantoins, in which a 5-monosubstituted hydantoin is reacted in the presence of an ion exchanger. Anion exchangers at a pH between 6.0 and 13.5 are preferred.