Abstract
5-Amino-4-hydroxyiminopyrazoles and (E)-N1-aryl-3-aryl-4-[(substitutedpyrazolyl)diazenyl]pyrazoles derivatives were conveniently synthesized as the corresponding products by reacting 5-aminopyrazoles with ethyl nitrite or sodium nitrite in ∼10% aqueous HCl solution. All of 5-amino-4-hydroxyiminopyrazoles and diazenes were fully identified by spectroscopic methods. Based on the single-crystal X-ray diffraction study, 5-amino-4-hydroxyiminopyrazole structure first identified and presented in this work as opposed to a nitroso tautomer.
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