Pyrido-oxazolyl-stilbenes, process for their manufacture and...

Details Pyrido-oxazolyl-stilbenes, process for their manufacture and... Pyrido-oxazolyl-stilbenes, process for their manufacture and...

C - Chemistry, Metallurgy

09

B

260/273

C09B 23/10 (2006.01) C07D 519/00 (2006.01)

Patent

CA 1110242

Abstract Compounds of the formula I Image I in which X is 0 or S, R1 and R2, being identical or different, are radicals selected from the group of hydrogen, fluorine or chlorine atoms, phenyl, C1-C9-alkyl, C1-C4-alkoxy, C1-C4-dialkyl-amino, acylamino radicals, or optio- nally functionally modified carboxy or sulfo groups, two adjacent radicals R1 and R2 together optionally representing a benzo ring, a lower alkylene or a 1,3-dioxapropylene group, and A is a group of the formulae or Image Image in which R3 and R4, independently from each other, are hydrogen, fluorine or chlorine atoms or C1-C4-alkyl groups; these compounds are useful as optical brighteners.

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