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Synthesis and Application of Some Azo and Azomethine Dyes Containing Pyrazolone Moiety
Authors:RIZK   Hala   F  El-BORAl   Mohamed   A  El-HEFNAWY   Gad   B  El-SAYED   Hatem   F
Affiliation:Department of Chemistry, University of Tanta, 31527 Tanta, Egypt
Abstract: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.
Keywords:3‐aminopyrazolone  azomethine dye  disperse dye  fastness property  diazonium salt
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