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ESR Study of Nitroxide Radicals Generated from Triaz‐2‐en‐1‐ols

Ladislav Omelka, Imrich Vrábel, Katarína Erentová, Jochen Dauth, Bernward Deubzer, Johann Weis

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Abstract

Abstract The triazenols 4‐R1C6H4NNN(OH)R2 (1), oxidized with t‐BuO radicals, produced nitroxide radicals R1C6H4N(O⋅)NN(R2) +O− (5). The suggested radical structure was confirmed by 15N‐labeling. The reaction of triazenols 1 with PbO2 proceeded under N2 elimination, in which case nitroxides R1C6H4N(R2)O⋅(2) were observed as the final radical products. The intermediate R1C6H radicals were identified by spin‐trapping.

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What this paper is about

Abstract The triazenols 4‐R1C6H4NNN(OH)R2 (1), oxidized with t‐BuO radicals, produced nitroxide radicals R1C6H4N(O⋅)NN(R2) +O− (5). The suggested radical structure was confirmed by 15N‐labeling. The reaction of triazenols 1 with PbO2 proceeded under N2 elimination, in which case nitroxides R1C6H4N(R2)O⋅(2) were observed as the final radical products. The intermediate R1C6H radicals were identified by spin‐trapping.

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Available abstract

Abstract The triazenols 4‐R1C6H4NNN(OH)R2 (1), oxidized with t‐BuO radicals, produced nitroxide radicals R1C6H4N(O⋅)NN(R2) +O− (5). The suggested radical structure was confirmed by 15N‐labeling. The reaction of triazenols 1 with PbO2 proceeded under N2 elimination, in which case nitroxides R1C6H4N(R2)O⋅(2) were observed as the final radical products. The intermediate R1C6H radicals were identified by spin‐trapping.

Key concepts: Chemistry, Radical, Nitroxide mediated radical polymerization, Spin trapping, Medicinal chemistry, Photochemistry, Organic chemistry, Radical polymerization

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