Abstract
Chromogenic fluoran compounds containing 4-ketoquinazolinone were synthesized by reacting 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid with vari- ous substituted 4-ketoquinazolinones in the presence of sulfuric acid. The 4-ketoqui- nazolinones were obtained by reacting various substituted benzoxazin-4-ones with 4-aminophenol or 2-nitro-p-anisidine. All the synthesized derivatives were identified by conventional methods, such as melting points, elemental analysis, IR, 1 H-NMR, and UV-visible spectroscopy in organic solvent and 95 % acetic acid. All the fluoran compounds develop colour on contact with acidic or electron-accepting compounds.
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