Aminonaphthalimide dyes

Naphthalimide Dyes. Derivatives of 4-aminonaphthalimide were used initially to dye acetate fibers. For polyesters, condensation products of 1,8-naphthalenedicar-boxylic acid (e.g., 19) or 1,4,5,8-naphthalenetetracarboxylic acid [128-97-2] with 1,2-diaminobenzenes are used. 

The 4-aminonaphthalimides and their /V-alkylatcd derivatives are brilliant greenish yellow fluorescent dyes. A cylation of the amino group at the 4-position of the naphthalimide ring shifts the fluorescence toward blue [111], yielding compounds suitable for use as optical brighteners, such as 4-acetylamino-7V-(//-butyl)naph-thalimide [3353-99-9] [112],... 

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