SCHEDULED MAINTENANCE
1-Methyl-3,4-diphenyl-Δ2-pyrazolin-5-one may be prepared by treatment of 2-bromo-1,3-diphenylpropanedione with methylhydrazine, a reaction involving reorganization of the carbon skeleton, probably proceeding via a halohydrin rearrangement.
M. J. Nye and W. P. Tang, J. Chem. Soc. D, 1971, 1395 DOI: 10.1039/C29710001395
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