SCHEDULED MAINTENANCE
4-Hydroxy-3,4-diphenyl-Δ2-pyrazolin-5-one may be synthesized from 5-hydroxy-3,5-diphenyl-Δ2-pyrazolin-4-one by treatment with ethanolic sodium hydroxide or from 4-hydroxy-3,5-diphenylpyrazole by treatment with methanolic sodium carbonate in the presence of air; in both cases the reaction mechanism is thought to involve an acyloin rearrangement.
M. J. Nye and W. P. Tang, J. Chem. Soc. D, 1971, 1394 DOI: 10.1039/C29710001394
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