Stilbene compounds and process for the manufacture thereof

Details Stilbene compounds and process for the manufacture thereof Stilbene compounds and process for the manufacture thereof

C - Chemistry, Metallurgy

09

B

260/250, 260/303

C09B 23/10 (2006.01) C07D 413/14 (2006.01) C07D 417/14 (2006.01) D06L 3/12 (2006.01)

Patent

CA 1111036

Abstract of the disclosure: Compounds of the formula Image (I) wherein X is O or S, R1 and R2, each are hydrogen, fluorine, chlorine, phenyl, alkyl, alkoxy, dialkylamino, trialkylam- monium, acylamino or optionally functionally modified carboxy or sulfo groups, two adjacent radicals R1 and R2 optionally forming together a phenylene, a lower alkylene or a 1,3-dioxapropylene group; and A is a group of the formulae Image or Image in which R3 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 reac- tion of a compound of the formula Image with a compound of the formula R3 - Z wherein Y is a Image group and Z is -COCl or vice versa.

327257

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