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Tautomerism and Fluorescent Properties of Aminovinylpyrazine Dyes

Diaminomaleonitrile (DAMN) was reacted with pyruvic aldehyde or pyruvic acid to produce 2,3-dicyano-5-methylpyrazine and 2,3-dicyano-6-hydroxy-5-methylpyrazine. Although these compounds did not show any fluorescence, condensation with arylaldehydes yielded red to violet coloured styryl type dyes with strong orange to red fluorescence. The tautomerism and fluorescent properties of these new pyrazine dyes are studied

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