Preparation of pyridine dyes

US5703238A · kind A · utility

Assignee

• BASF SE

Inventors

• Ernst Schefczik
• Sabine Gruttner-Merten · Bensheim, DE
• Peter Saling · Neustadt, DE
• Rudiger Sens · Ludwigshafen, DE
• Helmut Reichelt · Neustadt, DE

Key dates

• Filing date: Jul 30, 1996
• Grant date: Dec 30, 1997
• Expiry date: Jul 30, 2016

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C09B55/009
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Methine or azamethine dyes are prepared on the basis of pyridine dyes by condensing an oxime- or formyl-pyridine or its tautomeric form with 5-membered aromatic heterocycles.