Synthesis and Fluorescence of 2, 5-Distyryol-3, 6- bis(dimethylcarbamoyl)pyrazine Derivatives

Abstract

2, 5-Distyryl-3, 6-bis (dimethylcarbamoyl) pyrazine derivatives C 3 J were synthesized by the condensation of 2, 5-dimethyl-3, 6-bis(dimethylcarbamoyl)pyrazine[1] with substituted benzal- dehydes C 2 in a t-BuOH-hexamethylphosphoric triamide-tetrahydrofurane mixture. The yields of [3] were found to be remarkably influenced by reaction temperatures, solvents, and substituent groups.
Most of C3J are bright yellow crystals and have strong greenish yellow fluorescences. When illuminated with ultraviolet rays of wavelengths of about 365 nm, the dioxane solutions of C 3J fluoresce with maximum wavelengths of about 4500 nm.
Compounds of [ 3 ] dye both of nylon and polyethylene terephthalate, but their fastnesses to light are undesirable.