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

✍ Scribed by Hala F. RIZK; Mohamed A. El-BORAI; Gad B. El-HEFNAWY; Hatem F. El-SAYED

• Publisher: John Wiley and Sons
• Year: 2009
• Tongue: English
• Weight: 83 KB
• Volume: 27
• Category: Article
• ISSN: 0256-7660
• DOI: 10.1002/cjoc.200990227

✦ Synopsis

Abstract

3‐Amino‐1‐phenyl‐4,5‐dihydro‐1__H__‐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.