Abstract
Free Radical Reactions of N-Heterocyclic Compounds. XI. ESR-Study of Radicals of 3-Methyl-pyrazolin-5-ones The oxidation of 1,4-substituted 3-methylpyrazolin-5-ones (1a – p) led to pyrazolinonyl radicals (2a – p), which were detected directly or after trapping with nitrosobenzene as phenyl nitroxides. In a few cases, the products of oxidation of pyrazolin-5-ones (1) with electron-withdrawing groups in 4-position by peroxy radicals were endo cyclic nitroxides (8), which were also detected by ESR spectroscopy.
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