3-Aryl-7-pyrazolyl-coumarins

US3957817A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Alfons Dorlars · Leverkusen, DE
• Otto Neuner

Key dates

• Filing date: Nov 5, 1969
• Grant date: May 18, 1976
• Expiry date: Nov 5, 1989

Classification

• Technology area (CPC D): Textiles; Paper
• CPC primary: D06L4/60
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

3-Aryl-7-pyrazolyl-coumarin compounds of the formula ##SPC1## In which R stands for hydrogen, halogen, alkyl or alkoxy radicals, n represents the numbers 1-3, R.sub.1 and R.sub.2 represent, hydrogen or alkyl or phenyl radical, R.sub.1 and R.sub.2 may also form, together with the two carbon atoms of the pyrazole ring, a non-aromatic carbocyclic, 5- or 6-membered ring system, radical as well as their production and use as brightening agents.