Condensation of 2,3-dihydroperimidines with squaric acid under conditions of azeotropic removal of water affords a new class of diarylsquaraine dyes with intense absorption bands at ca. 800nm.
K. A. Bello, S. N. Corns and J. Griffiths, J. Chem. Soc., Chem. Commun., 1993, 452 DOI: 10.1039/C39930000452
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