Answers are grounded in this paper and cite their sources.
Phenylhydrazine or hydrazine react with 3‐acetyl‐4‐hydroxy‐6‐methyl‐2H‐pyran‐2‐one (1) to give 4‐acetoacetyl‐3‐methylpyrazolin‐5‐ones 4. The synthesis of bipyrazoles and pyrazoloisoxazoles from 4 are reported.
No takes yet. Share an insight, caveat, or question.
Bendaas et al. (1999) studied this question.
Synapse has enriched 5 related papers. Consider them for comparative context: