Rate Constants for Reactions of Peroxyl Radicals in Fluid Solutions

Neta, P.; Huie, Robert E.; Ross, Alberta B.

doi:10.1063/1.555854

Cited by 386 publications

(243 citation statements)

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“…Rate constants corresponding to oxygen addition to organic radicals are in the order of 1 9 10 9 M -1 s -1 (Neta et al 1990). …”

Section: Influence Of Oxygen Concentrationmentioning

confidence: 98%

“…First-order decomposition of organic peroxyl radicals varies in a wide range of values from some hundreds (or even lower figures) to values in the interval 10 5 -10 6 M -1 s -1 (Neta et al 1990). An intermediate value of 10 3 M -1 s -1 has been used in this work.…”

Section: Influence Of Oxygen Concentrationmentioning

confidence: 99%

“…Reactions of substituted alkylperoxyl radicals with several organic substrates were compiled by Neta et al (1990). A generic value of 10 5 M -1 s -1 has been assumed.…”

Section: Influence Of Oxygen Concentrationmentioning

confidence: 99%

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Photocatalytic elimination of aqueous 2-methyl-4-chlorophenoxyacetic acid in the presence of commercial and nitrogen-doped TiO2

Rivas

Solís

Gimeno

et al. 2013

Int. J. Environ. Sci. Technol.

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An attempt to synthesize an active photocatalyst for 2-methyl-4-chlorophenoxyacetic acid removal has been accomplished. Black light (main emission wavelength at 365 nm) photocatalytic experiments with bare and N-doped titania have been carried out, and the results compared to those obtained in the presence of titania Degussa P-25. Doping percentage and calcination temperature influences have been investigated in photocatalytic runs using pure and commercial 2-methyl-4-chlorophenoxyacetic acid. In no case, the results obtained with synthesized titania improved the activity of P-25. Some kinetic tests allowed for the proposal of a pseudoempirical reaction mechanism capable of acceptably simulating the process in the presence of P-25. From the proposed mechanism, the roles played by hydroxyl, peroxyl and organic radicals have been suggested.

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“…Rate constants corresponding to oxygen addition to organic radicals are in the order of 1 9 10 9 M -1 s -1 (Neta et al 1990). …”

Section: Influence Of Oxygen Concentrationmentioning

confidence: 98%

Section: Influence Of Oxygen Concentrationmentioning

confidence: 99%

See 1 more Smart Citation

Photocatalytic elimination of aqueous 2-methyl-4-chlorophenoxyacetic acid in the presence of commercial and nitrogen-doped TiO2

Rivas

Solís

Gimeno

et al. 2013

Int. J. Environ. Sci. Technol.

View full text Add to dashboard Cite

show abstract

“…This radical may react with other carbon-centered radicals or with O 2 . The latter results in the formation of a peroxyl radical (121). Peroxyl radicals may either undergo an elimination reaction, by which HO 2 is released, or generate hydroperoxides through hydrogen abstraction from another molecule.…”

Section: Short Overview On Chemistry Of Protein Oxidationmentioning

confidence: 99%

“…For instance, they may undergo dimerization due to the reaction with other carbon-centered radicals or they may be repaired by thiols, generating thiyl radicals. However, the predominantly occurring reaction under aerobic conditions is the formation of peroxyl radicals (121). As a result, alkoxyl radicals, hydroperoxides, alcohols, and carbonyls may be generated (36).…”

Section: Short Overview On Chemistry Of Protein Oxidationmentioning

confidence: 99%

Protein Oxidation in Aging: Does It Play a Role in Aging Progression?

Reeg

Grune

2015

Antioxidants & Redox Signaling

166

134

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Significance: A constant accumulation of oxidized proteins takes place during aging. Oxidation of proteins leads to a partial unfolding and, therefore, to aggregation. Protein aggregates impair the activity of cellular proteolytic systems (proteasomes, lysosomes), resulting in further accumulation of oxidized proteins. In addition, the accumulation of highly crosslinked protein aggregates leads to further oxidant formation, damage to macromolecules, and, finally, to apoptotic cell death. Furthermore, protein oxidation seems to play a role in the development of various age-related diseases, for example, neurodegenerative diseases. Recent Advances: The highly oxidized lipofuscin accumulates during aging. Lipofuscin formation might cause impaired lysosomal and proteasomal degradation, metal ion accumulation, increased reactive oxygen species formation, and apoptosis. Critical Issues: It is still unclear to which extent protein oxidation is involved in the progression of aging and in the development of some age-related diseases. Future Directions: An extensive knowledge of the effects of protein oxidation on the aging process and its contribution to the development of age-related diseases could enable further strategies to reduce age-related impairments. Strategies aimed at lowering aggregate formation might be a straightforward intervention to reduce age-related malfunctions of organs. Antioxid. Redox Signal. 23, 239-255.

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Theoretical study on the gas-phase reactivity of halogenated alkylperoxyl radicals toward alkenes

El‐Taher

1999

Int. J. Quant. Chem.

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The electrophilic additions of hydroperoxyl HO , alkylperoxyl RO , 2 2 and halogenated alkylperoxyl radicals to ethylene were studied using the AM1 and PM3 semiempirical MO methods at the SCFrUHF level. Reactantlike transition states were Ž U . predicted for the title additions. The AM1 activation enthalpies ⌬ H were found to be f increased in the order HO ؒ -CH O ؒ -C H O ؒi-C H O ؒ . The reactivity of an 2 3 2 2 5 2 3 7 2 alkylperoxyl radical toward ethylene was found to be increased as the degree of halogen substitution on the alkyl group increased. A good correlation was established between ⌬ H U and the Taft polar substituent constants, *. The Evans᎐Polanyi correlation f between ⌬ H U and ⌬ H T was justified and the validity of the Hammond postulate was f r indicated. The calculated results were compared with the available experimental findings.

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Rate Constants for Reactions of Peroxyl Radicals in Fluid Solutions

Cited by 386 publications

References 0 publications

Photocatalytic elimination of aqueous 2-methyl-4-chlorophenoxyacetic acid in the presence of commercial and nitrogen-doped TiO2

Photocatalytic elimination of aqueous 2-methyl-4-chlorophenoxyacetic acid in the presence of commercial and nitrogen-doped TiO2

Protein Oxidation in Aging: Does It Play a Role in Aging Progression?

Theoretical study on the gas-phase reactivity of halogenated alkylperoxyl radicals toward alkenes

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