Abstract
The reaction of Β-oxonitrones — imidazoline derivatives — with hydroxylamine, phenylhydrazine, and semicarbazide takes place at the carbonyl group with retention of the nitrone group. Stable nitroxyl radicals — spiroimidazoisoxazole derivatives — are formed in the oxidation of Β-hydroximinonitrones. The recyclization of the Β-oxonitrones, which takes place in an acidic medium, as well as by the action of hydrazine and thiosemicarbazide, leads, respectively, to pyrroline and pyrazole derivatives.
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