Synthesis and Application of Some Azo and Azomethine Dyes Containing Pyrazolone Moiety

3‐Amino‐1‐phenyl‐4,5‐dihydro‐1H‐pyrazol‐5‐one ( 1 ) was used as starting material for the synthesis of a number of azo compounds 3a–3c and azomethine derivative 4 . The deblocking of 3a – 3c and 4 gave rise to 5a – 5c and 6 in which a free amino was revealed. The diazonium salts of 5a – 5c and 6 were coupled with several phenols to produce a number of bis azo compounds 7a – 7c and 8a – 8c with azomethine in position 4 and azoic group in position 3. The prepared dyes were structurally confirmed by elemental analysis, spectral methods and applied to different fibers (wool, polyester and blend of wool/polyester) as disperse dyes and their fastness properties were measured.