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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-1 H -pyrazolo[3,4- c ]pyridazine in the presence of ethanol yielded 1-(4, 5-Diphenyl-1 H -pyrazolo[3, 4- c ]pyridazin-3-yl)-3-methyl-4-(2-phenylhydrazono)-1 H -pyrazol-5(4 H )-one derivatives. The dyes were applied to polyester fabric, and their absorption spectral characteristics, fastness properties and color assessment measured.

european journal of chemistry

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