The first examples of monoazo dyes absorbing in the near infrared (up to 806 nm in dimethyl sulphoxide) have been prepared from 2-(4-amino-2-acetylaminophenylazo)-4-chloro-5-formylthiazoles by condensing the formyl group with suitably electronegative active methylene compounds under base catalysed conditions.
K. A. Bello and J. Griffiths, J. Chem. Soc., Chem. Commun., 1986, 1639 DOI: 10.1039/C39860001639
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