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The reactivity of antioxidants with peroxy and alkoxy radicals in the presence of transition metals. II. Radical processes in multicomponent antioxidant systems

Autor: A. Tkáč, L. Omelka

Publikováno v: Journal of Polymer Science: Polymer Symposia. 40:119-132

In nonpolar solvents the mechanism of bimolecular substitution reactions between t-butyl-peroxy and t-butoxy radicals with different phenols and diarylamines was quantitatively studied by means of electron paramagnetic resonance (EPR) spectroscopy in

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e87a60752a373fe45f0862b3f4181d76
https://doi.org/10.1002/polc.5070400116

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The reactivity of antioxidants with peroxy and alkoxy radicals in the presence of transition metals. I. Relation between the structure of free antioxidant radicals and inhibition of oxidation in polymers

Autor: L. Omelka, J. Holčík, A. Tkáč

Publikováno v: Journal of Polymer Science: Polymer Symposia. 40:105-117

The efficiency of homolytic splitting of the OH bond of different phenols, bisphenols, thiophenols, naphthols, and benzophenones and the transfer of the hydrogen atom to an alkoxy or alkyl-peroxy radical is a function of the electro-affinity of the s

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::12dc8dd428ddf3f137ad02106effad67
https://doi.org/10.1002/polc.5070400115

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Quantum chemical study of the preferential ortho-addition of phenoxyl radicals to nitroso spin-traps

Autor: P. Pelikán, L. Omelka, Kateřina Brudíková, Martin Breza

Publikováno v: Journal of Molecular Structure: THEOCHEM. 624:251-255

The addition of phenoxyl radicals to aromatic nitroso compounds preferentially proceeds in the phenoxyl ortho-position. Using ab initio MP2 treatment, the mechanism of this reaction has been interpreted on the basis of electron structure analysis of

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::0fe881345c6a8c3b18b01a6c18505730
https://doi.org/10.1016/s0166-1280(02)00789-3

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Akademický článek

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Cyclovoltammetric and EPR study of arylazophosphonates

Autor: C. Scherer, Oskar Nuyken, L. Omelka, K. Erentová, A. Stasko

Publikováno v: Physical Chemistry Chemical Physics. 1:5025-5028

Monofunctional arylazophosphonates p-X–C6H4N12N2PO(OCH3)21a–f with X=H (1a, 1b), Cl (1c), CH3O 2a–c with X=–(2a), O (2b) and CO (2c) were prepared. They showed relatively high photochemical and thermal stability. Monofunctional compounds 1a�

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::a14ee0e49a1382bfc569dfb3dfc48227
https://doi.org/10.1039/a905148a

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Radical products of the oxidation of 2,2-diacyl-1-arylhydrazines with the system Pb(OAc)4-CF3COOH-CH2Cl2

Autor: Manfred Schulz, Ralph Kluge, L. Omelka

Publikováno v: Monatshefte für Chemie - Chemical Monthly. 126:155-161

The oxidation of 2,2-Diacyl-1-arylhydrazines1a–l with the system Pb(OAc)4-CF3COOH-CH2Cl2 led to the formation of two types of radical products. Phenazinium cation radicals5a–h were formed from 2,2-diacyl-1-arylhydrazines1a–h, while hydrazyl rad

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::575a970a4e61b321ef6c797ba2d4075e
https://doi.org/10.1007/bf00812244

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