Process for preparing 3-anilino-pyrazolones-(5)

US3931221A · kind A · utility

Assignee

• Agfa-Gevaert NV · BE

Inventors

• Ernst Meier · Munich, DE
• Hans Glockner
• Karl Kuffner · Unterhaching, DE
• Immo Boie · Cologne, DE
• Fritz Nittel · Leverkusen, DE

Key dates

• Filing date: Dec 27, 1973
• Grant date: Jan 6, 1976
• Expiry date: Dec 27, 1993

Classification

• Technology area (CPC G): Physics
• CPC primary: G03C7/384
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Anilinopyrazolone are to be prepared in high yields and with a high degree of purity by reacting a salt particularly hydrochloride of a .beta.-arylamino-.beta.-imino-propionic acid ester of one of the tautomeric formulae which are defined hereinafter with a suitable substituted hydrazine.