A facile synthesis and tautomeric structure of novel 4‐arylhydrazono‐3‐(2‐hydroxyphenyl)‐2‐pyrazolin‐5‐ones and their application as disperse dyes

• DOI: 10.1111/cote.12052
• Publication Date: 2013-08-22T17:09:11Z
• Authors: Mohamed A Metwally; Samir Bondock; El‐Sayed I El‐Des...; Moaz M Abdou
• Keywords: Hydrazine (antidepressant)

The main target of this paper was the synthesis novel azo disperse dyes with better dyeing properties, together a systematic investigation to determine their dominant tautomer(s) from 12 possible tautomeric structures. In regard, azopyrazolin-5-one were synthesised via reaction hydrazine hydrate 2,3,4-chromantrione-3-arylhydrazones. acid dissociation constants both in ground and excited state for series prepared determined correlated by Hammett equation. results correlation, spectral data, indicated that compounds under scrutiny exist predominantly keto-hydrazo structure as Z-configuration, state. Finally, applied polyester fabrics, fastness properties evaluated. Also, position colour CIELAB coordinates estimated discussed.