Stilbenes, process for the manufacture thereof and the use thereof as optical brighteners

US4197401A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

• Dieter Gunther · Kelkheim, DE
• Rudiger Erckel · Eppstein, DE
• Gunter Rosch · Bad Soden am Taunus, DE

Key dates

• Filing date: Mar 20, 1978
• Grant date: Apr 8, 1980
• Expiry date: Mar 20, 1998

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D519/00
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Compounds of the formula I ##STR1## in which X is O or S, R.sub.1 and R.sub.2, being identical or different, are radicals selected from the group of hydrogen, fluorine or chlorine atoms, phenyl, C.sub.1 -C.sub.9 -alkyl, C.sub.1 -C.sub.4 -alkoxy, C.sub.1 -C.sub.4 -dialkyl-amino, acylamino radicals, or optionally functionally modified carboxy or sulfo groups, two adjacent radicals R.sub.1 and R.sub.2 together optionally representing a benzo ring, a lower alkylene or a 1,3-dioxapropylene group, and A is a group of the formulae ##STR2## in which R.sub.3 and R.sub.4, independently from each other, are hydrogen, fluorine or chlorine atoms or C.sub.1 -C.sub.4 -alkyl groups.