Şener N., Gür M., Çavuş M.S., Zurnaci M., Şener İ.Sener, N, Gur, M, Cavus, MS, Zurnaci, M, Sener, I2023-05-092023-05-092019-03-012019.01.010022-152Xhttps://hdl.handle.net/20.500.12597/123617-Amino-3-phenylazo-2-methyl-4H-pyrazolo[1,5-a]pyrimidine-5-one (3) was synthesized by the reaction of 5-amino-3-methyl-4-phenylazo-1H-pyrazole and 2-aminobenzothiazole with ethyl cyanoacetate in acetic acid at 150°C. Four novel heterocyclic azo disperse dyes were obtained by the coupling of heterocyclic amines-based diazonium chloride with compound 3. They were purified and characterized by elemental analysis, FTIR, and 1 H NMR. Furthermore, solvatochromic behaviors of related dyes were studied in detail by using ultraviolet–visible absorption spectrometer. The experimental data were supported by density functional theory using b3lyp/cc-pvtz level calculations, and a detailed analysis of predicted tautomeric structures was made.falseSynthesis, Characterization, and Theoretical Calculation of New Azo Dyes Derived from [1,5-a]Pyrimidine-5-one Having Solvatochromic PropertiesSynthesis, Characterization, and Theoretical Calculation of New Azo Dyes Derived from [1,5-a]Pyrimidine-5-one Having Solvatochromic PropertiesArticle10.1002/jhet.349710.1002/jhet.34972-s2.0-85060336095WOS:00046190620004111011110561943-5193