Process for the preparation of arylhydantoins

US5436256A · kind A · utility

Assignee

• Chemie Linz Gesellschaft m.b.H. · AT

Inventors

• Wolfram Hendel · Leonding, AT
• Engelbert Kloimstein · Eferding, AT
• Klaus Fitzinger · Linz, AT
• Antonia Viehbock · Linz, AT
• Kurt Haidinger · Linz, AT

Key dates

• Filing date: Nov 26, 1993
• Grant date: Jul 25, 1995
• Expiry date: Nov 26, 2013

Classification

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

Abstract

Process for the preparation of 5-arylhydantoins by reaction of an allantoin acid alkyl ester with an aryl compound in a concentrated inorganic acid at temperatures from room temperature to 150.degree. C., with or without a phase transfer agent.