The syntheses of 4-(substituted phenylazo)-3,5-diacetamido-1H-pyrazoles and investigation of electronic spectra of the compounds

Diazonium salts were prepared with the use of various aniline derivatives and 2-(substituted phenylazo)malononitriles were synthesized by the coupling reaction of the diazonium salts with malononitrile and, then, 4-(substituted phenylazo)-3,5-diamino-1Hpyrazoles were obtained by ring closure of these compounds with hyrazine monohydrate. Finally, these pyrazoles were reacted with acetic acid to prepare acetyl derivatives as a potential dyestuffs. The structure of products synthesized elucidated by proton NMR, MS and FT-IR spectra of the compounds. Also, the behavior of the compounds with solvent, consentration and acid-base were investigated with the use of UV-visible spectroscopy.