Chemical and spectral properties of a series of 1-oxa-5,6-diazaspiro[2.4]hept-6-en-4-ones, synthesized by the oxidation of 4-alkylidene- or 4-arylidene-1-aryl-2-pyrazolin-5-ones are reported.
S. N. Eḡe, A. D. Adams, E. J. Gess, K. S. Ragone, B. J. Kober, M. B. Lampert, P. Umrigar, D. C. Lankin and G. W. Griffin, J. Chem. Soc., Perkin Trans. 1, 1983, 325 DOI: 10.1039/P19830000325
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