1,3-Cycloadditions of nitrile oxides to αβ-unsaturated ketones have been studied. In most cases a mixture of the two regioisomeric 3-substituted 4- and 5-acyl-Δ2-isoxazolines was obtained. The individual compounds were characterised by chemical and/or spectroscopic methods. Effects of steric and electronic factors on the cycloadditions are discussed.
G. Bianchi, C. De Micheli, R. Gandolfi, P. Grünanger, P. V. Finzi and O. V. de Pava, J. Chem. Soc., Perkin Trans. 1, 1973, 1148 DOI: 10.1039/P19730001148
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