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Activated enol ethers derived from methyl or ethyl acetoacetate/cyanoacetates or nitriles and pentane-2,4dione react with pentafluorophenylhydrazine through the primary amino-group to afford pyrazoles bearing a preferred 5-aminoover 5-methylor 5-hydroxy-substituent in the resulting 4-substituted pyrazoles.

Study of reactions of pentafluorophenylhydrazine with activated enolethers. Synthesis of N-pentafluorophenylpyrazoles