- KINETICS OF OXIDATION OF 2,2,4,5,5-PENTAMETHYL-1-HYDROXY-3-IMIDAZOLINE-3-OXIDE BY DECANEPERSULFONIC ACID
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The kinetics was studied of the oxidation of 2,2,4,5,5-pentamethyl-1-hydroxy-3-imidazoline-3-oxide by decanepersulfonic acid in a chloroform solution.The corresponding nitroxyl radical is quantitatively formed by the reaction 2 =N-OH + RSO4H -> 2 =NO(1.) + RSO3H + H2O A mechanism of the reaction was proposed and the rate constant of the limiting stage of the process was determined.
- Safiullin, R. L.,Volgarev, A. N.,Shishlov, N. M.,Komissarov, V. D.
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- The formation of nitroxyl radicals in reactions of dimethyldioxirane with 2,2,6,6-tetramethylpiperidine and 2,2,5,5-tetramethyl-3-imidazoline-3-oxide derivatives
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The oxidation of secondary and tertiary amines, derivatives of 2,2,6,6-tetramethylpiperidine and 2,2,5,5-tetramethyl-3-imidazoline-3-oxide, by dimethyldioxirane results in the formation of nitroxyl radicals, which induce the decomposition of dimethyldioxirane. Chemiluminescence in the IR and visible regions during the reaction of dimethyldioxirane with 2,2,6,6-tetramethyl-4-hydroxypiperidine-1-oxyl was observed.
- Kabal'nova,Grabovsky,Shishlov,Shereshovets,Volodarskii,Tolstikov
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p. 2419 - 2421
(2007/10/03)
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- THE OXIDATION OF SECONDARY AMINES BY ALKANESULFONIC PERACIDS
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Alkanesulfonic peracids are efficient oxidation agents for the conversion of secondary amines to the corresponding nitroxyl radicals.
- Safiullin, R. L.,Enikeeva, L. R.,Bukin, I. I.,Mukhametova, G. A.,Shishlov, N. M.,et al.
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p. 1045 - 1047
(2007/10/02)
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- Spin Trapping. III. Studies of Radical Reactions of a Bicyclic 1-Hydroxy-3-imidazoline-3-oxide
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Radical addition reactions to the nitrono group and the oxidation of the 8-hydroxy-1,4,5,7-tetramethyl-6,8-diazabicyclooct-6-en-6-oxide 2b were investigated by e.s.r.-spectroscopy.Oxidation of 2b by Ag2O, PbO2, hydrogenperoxide, tert.-butoxy and benzoyloxy radicals, respectively, yields a bicyclic nitroxide with typical a(N)-value (1,9 mT).Testing a wide range of carbon-centered radicals we did not find, however, any spin adducts in contrast to the literature.Only H-atoms are found to add to the nitrone function of 2b giving a bicyclic nitroxide 4b (R'=H) with a(N)-value of 1,4 mT, a(Hax) = 2,4 mT.The relationship between a ring-chain tautomerism of 2 as previously described and the formation of radicals has been demonstrated by radical reactions of derivatives of ring opened isomers 5b.
- Reinhardt, Michael,Schulz, Manfred,Roembach, Joachim
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p. 597 - 602
(2007/10/02)
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