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Nine novel 4-arylidene-5(4H)-oxazolone azo dyes were synthesized in good yield by reacting sodium 2-(4-{2-(4-(dimethylamino)phenyl)-1-diazenyl}benzoylamino)acetate with suitable aldehydes in the presence of Ph3P/CCl4 and acetonitrile at room temperature. Sodium 2-(4-{2-(4- (dimethylamino)phenyl)-1-diazenyl}benzoylamino)acetate was obtained by diazotization of 4- aminohippuric acid and coupling with N,N-dimethylaniline. These dyes were characterized by elemental and spectral analyses and the solvatochromic behaviour in various solvents was evaluated.

A synthesis of some new 4-arylidene-5(4H)-oxazolone azo dyes and an evaluation of their solvatochromic behaviour