The isoxazole obtained by condensation of nitroethane and 6-bromopiperonal is shown to have the 3,5-dimethyl-4-aryl structure (6) by comparison of its 13C n.m.r. spectrum with those of several model compounds.
G. M. Buchan and A. B. Turner, J. Chem. Soc., Perkin Trans. 1, 1975, 2115 DOI: 10.1039/P19750002115
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