Certain oximes having an α-hydrogen atom were treated with n-butyl-lithium (2 mol.equiv.) to give the 1,4-dianions, which were carbonated and acid-cyclized to give the Δ2-isoxazolin-5-ones.
J. S. Griffiths, C. F. Beam and C. R. Hauser, J. Chem. Soc. C, 1971, 974 DOI: 10.1039/J39710000974
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