N

from sb a,P-unsat. ketone + ArNHNH2

pyrazoles (ctd)

pyrazolones pyrazolines cyclic ureas or thioureas

0 a2

POU X I

5-aminopyrazoles from sb aldehyde nitrile + hydrazine [543]

5-aminopyrazoles from sb P-ketonitrile + hydrazine [164]

) < ° N Ph from sb phenylhydrazone + TFA, w.c.s. [295]

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