Novel stilbene compounds and process for the manufacture thereof

US4310665A · kind A · utility

Assignee

• Hoechst GmbH · DE

Inventors

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

Key dates

• Filing date: Sep 26, 1980
• Grant date: Jan 12, 1982
• Expiry date: Sep 26, 2000

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C07D417/14
• WIPO field: Organic fine chemistry
• WIPO sector: Chemistry

Abstract

Compounds of the formula ##STR1## wherein X is O or S, R.sub.1 and R.sub.2 each are hydrogen, fluorine, chlorine, phenyl, alkyl, alkoxy, dialkylamino, trialkylammonium, acylamino or optionally functionally modified carboxy or sulfo groups, two adjacent radicals R.sub.1 and R.sub.2 optionally forming together a phenylene, a lower alkylene or a 1,3-dioxapropylene group; and A is a group of the formulae ##STR2## in which R.sub.3 is an alpha-, beta- or gamma-pyridyl, pyridyl-methylene, thiophenyl, furanyl, benzofuranyl, pyrazinyl, pyrimidinyl or pyridazinyl group. These compounds, which are suitable as optical brighteners, are prepared by reaction of a compound of the formula ##STR3## with a compound of the formula EQU R.sub.3 --Z wherein Y is a ##STR4## group and Z is --COCl or vice versa.