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Stable free radicals generated during the oxidation of 4-alkyl Hantzsch 1,4-dihydropyridines with nitrosonium — EPR evidence

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image of Research on Chemical Intermediates

Stable free radicals were observed by EPR technique during the oxidation of 4-isopropyl and 4-isobutyl Hantzsch 1,4-dihydropyridines with nitrosonium tetrafluoroborate (NO+BF-4) in anhydrous and anaerobic acetonitrile at room temperature. These free radicals were assigned to diisopropyl aminoxyl and diisobutyl aminoxyl, respectively. A whole mechanism for the oxidation was suggested.

Affiliations: 1: National Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China


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