4-Arylmethylene-1-phenyl-Δ2-pyrazolin-5-ones react with carbonyl-stabilized sulphur ylides yielding spiro-[cyclopropane-1,4′-Δ2′-pyrazolin]-5′-ones, identified from spectroscopic data and chemical behaviour.
P. D. Croce and D. Pocar, J. Chem. Soc., Perkin Trans. 1, 1976, 620 DOI: 10.1039/P19760000620
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