SCHEDULED MAINTENANCE
Certain hydrazones having an α-hydrogen atom were treated with 3 mol. equiv. of n-butyl-lithium to give (presumably) the C(α)NN-trianions. These trianions were aroylated with esters at the α-carbanionic centre and cyclized with acid to give pyrazoles.
C. F. Beam, R. S. Foote and C. R. Hauser, J. Chem. Soc. C, 1971, 1658 DOI: 10.1039/J39710001658
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