Pyrazolo-as-triazines bearing an ester or ketonic substituent at the 3-position readily undergo ring fission with hydrazines or hydroxylamine to yield pyrazolylazo-pyrazole or isoxazole derivatives.
M. W. Partridge and M. F. G. Stevens, J. Chem. Soc. C, 1967, 1828 DOI: 10.1039/J39670001828
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