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Pyridazine and its related compounds: Part 33. Synthesis of some disperse dyes derived from 3-hydrazinyl-4,5-diphenyl-1H-pyrazolo[3,4-c]pyridazine and their color assessment on polyester fabric Deeb, Ali AbdelHamid El‐Hossami, Mamdoh Bahgat Abdelgawad, Ahmed Awad Mohammed Pyridazine Color assessment Dyeing properties Fastness properties Heterarylazo disperse dyes Absorption spectral characteristics Active methylene compound such as ethyl acetoacetate was coupled with diazotized arylamines to give ethyl arylazoacetoacetates. When the obtained compounds refluxed with 3-hydrazinyl-4,5-diphenyl-1H-pyrazolo[3,4-c]pyridazine in the presence of ethanol yielded 1-(4, 5-Diphenyl-1H-pyrazolo[3, 4-c]pyridazin-3-yl)-3-methyl-4-(2-phenylhydrazono)-1H-pyrazol-5(4H)-one derivatives. The dyes were applied to polyester fabric, and their absorption spectral characteristics, fastness properties and color assessment measured. Atlanta Publishing House LLC 2015-03-31 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion application/pdf https://www.eurjchem.com/index.php/eurjchem/article/view/1145 10.5155/eurjchem.6.1.57-62.1145 European Journal of Chemistry; Vol. 6 No. 1 (2015): March 2015; 57-62 2153-2257 2153-2249 eng https://www.eurjchem.com/index.php/eurjchem/article/view/1145/pdf_1145