ISSN print edition: 0366-6352 ISSN electronic edition: 1336-9075 Registr. No.: MK SR 9/7 Published monthly

Oxidation of Substituted 3-Anilinopyrazoles with RO₂^∙ Radicals, Studied by EPR Spectroscopy

L. Omelka and M. Schulz

Department of Physical Chemistry, Faculty of Chemical Technology, Slovak Technical University, CS-812 37 Bratislava

Abstract: The reaction of RO₂^. radicals with substituted 3-anilinopyrazoles, containing different types of aminic groups in their molecule, proceeds under formation of nitroxyl radicals. Radical attack occurs preferentially on the exocyclic NH group. Under specific steric conditions nitroxyl radicals were observed as products of the oxidation of NH₂ group in the position 5 of pyrazole ring. No radicals coming from the oxidation of endocyclic NH group were identified. The studied nitroxyl radicals are characterized by their EPR parameters.

Full paper in Portable Document Format: 473a153.pdf

Chemical Papers 47 (3) 153–155 (1993)