10128-55-9Relevant articles and documents
Fluorescent compounds and their use
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, (2008/06/13)
Compounds, most of which are novel, and which have been found to have properties very suitable for use in fluorescent inks intended for marking security documents, are of formula I wherein R1, R2, R3 and R4 are independently H, Z or Z-substituted phenyl; and Ar is optionally Z-substituted phenyl or heterocyclyl; in which the Z's are independently selected from C1 4alkyl, OH, C1-C4 alkoxy, halogen, NO2, NH2, C1 4 alkylamino, di(C1 4 alkyl)amino and phenyl; provided that R1, R2, R3 and R4 are not all H when Ar is alkylphenyl or alkoxyphenyl.