Benzofuran derivatives, process for their preparation and...

Details Benzofuran derivatives, process for their preparation and... Benzofuran derivatives, process for their preparation and...

C - Chemistry, Metallurgy

07

D

260/303

C07D 271/10 (2006.01) C07D 413/04 (2006.01)

Patent

CA 1077489

NOVEL BENZOFURAN DERIVATIVES, PROCESS FOR THEIR PREPARATION AND THEIR USE AS OPTICAL BRIGHTENERS Abstract of the Disclosure: Compounds of the formula A Image (1) , in which A stands for aromatic mono- or polynuclear ring systems which are fused with the furan nuclei in the manner indicated above by means of two adjacent carbon atoms, R represents hydrogen or halogen atoms, lower alkyl groups, phenyl groups which are optionally substituted by lower alkyl, lower alkoxy groups or halogen atoms, as well as optionally functionally modified carboxy or sulfo groups, and D is a direct bond or a divalent aliphatic, aromatic or heteroaromatic connecting member continuing the conjugation, group A may be substituted by lower alkyl, alkenyl, alkoxy, aryl groups, preferably phenyl groups, optionally functionally modified carboxy or sulfo groups, acyl, acylamino or sulfonyl groups, as well as by halogen atoms. These compounds are valuable optical brighteners and can be applied by the methods known in this field.

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