Benzodifuran compounds

US3971731A · kind A · utility

Assignee

• BAYER HEALTHCARE LLC · DE

Inventors

• Peter Hartmann · Darmstadt, DE
• Hans Theidel

Key dates

• Filing date: Mar 20, 1975
• Grant date: Jul 27, 1976
• Expiry date: Mar 20, 1995

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D493/04
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Benzodifuran compounds of the formula ##SPC1## Wherein PA1 R represents alkoxy, aralkoxy, aryloxy, cycloalkoxy, hydroxyl, an oxygen atom linked to the radical Ar, or the group ##EQU1## R.sub.1 and R.sub.2 independently of one another denote hydrogen, alkyl, aralkyl or aryl, or together denote a saturated carbocyclic or heterocyclic ring and Ar denotes an aromatic-carbocyclic or aromatic-heterocyclic radical, with the proviso that Ar denotes a substituted benzene radical if R represents C.sub.1 -C.sub.2 -alkyl, Are suitable as optical brightening agents and UV-absorber for organic materials.