Antioxidative properties of phenyl-substituted phenols. Part I. The mechanism of synergism between 4-alkoxy-2,6-diphenylphenols and ββ′disubstituted diethyl sulphides

doi:10.1039/P29730001276

Paper

Antioxidative properties of phenyl-substituted phenols. Part I. The mechanism of synergism between 4-alkoxy-2,6-diphenylphenols and ββ′disubstituted diethyl sulphides

Published 1973 · C. Jonge, H. J. Hageman, W. Huysmans

Journal of The Chemical Society-perkin Transactions 1

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Abstract

A pronounced synergism between 4-alkoxy-2,6-diphenylphenols and ββ′disubstituted diethyl sulphides has been observed in the inhibition of autoxidation of polypropene at 180 °C. The mechanism of this synergistic action (at temperatures 150 °C) has been investigated. N.m.r. model experiments have shown that the phenolic antioxidant (AH) is regenerated continuously from the phenoxyl radical (A·) by hydrogen atom donation by the sulphenic acid, a product originating from the ββ-′disubstituted diethyl sulphide. This observation is of possible contributory importance to the understanding of the mechanism of synergistic effects.

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The synergistic action between 4-alkoxy-2,6-diphenylphenols and ′disubstituted diethyl sulphides in inhibiting polypropene autoxidation at 180°C is mediated by continuous phenolic antioxidant regeneration from phenoxyl

PopulationOlder adults (50-71 years)

Sample size24

MethodsObservational

OutcomesBody Mass Index projections

ResultsSocial networks mitigate obesity in older groups.

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Paper

Antioxidative properties of phenyl-substituted phenols. Part I. The mechanism of synergism between 4-alkoxy-2,6-diphenylphenols and ββ′disubstituted diethyl sulphides

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References

Citations

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The Ph3P/TiCl4 combination effectively promotes deoxygenation of sulfoxides, resulting in good yields (up to 97%) and moderate selectivities in kinetic resolution of racemic phosphines using optically active sulfoxide.

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Copper(I) Chloride-Oxygen is a strong oxidant, and proper handling and storage precautions are necessary.

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Thermal decomposition of 2,2′-azobis(2-methylpropionitrile) in the presence of 2,6-di-t-butyl-1,4-benzoquinone leads to the formation of 2,6-di-t-butyl-1,4-di(2-cyano-2

Sulfinyl, α‐Sulfinyl, Sulfonyl, and α‐Sulfonyl Radicals

Sulfinyl, -sulfinyl, sulfonyl, and -sulfonyl radicals form and react in various systems, with molecular orbital calculations and spectral properties also discussed.

Dissociation of 4-tert-butoxy-2, 6-di-tertbutylphenoxyl and antioxid ative activity of phenols with alkoky substituents

Decomposition of phenolic antioxidants in benzene leads to impairment of their antioxidative activity, indicating their potential use in pharmacological applications.

Kinetics of the reactions of substituted benzoquinones with alkyl radicals

Sec-decyl radicals react with 2,6-di-tert-butyl-, 2,6-diphenyl-p-benzoquinone, and 2,4- and 2,5-di-tert-butyl-o-benzoquinones at 50°C,

Spectral and kinetic characteristics of 2,6-diphenyl-4R-phenoxyl radicals

Phenylsubstituted phenoxyl radicals exhibit deeper coloration and kinetic and thermodynamic properties, with dimerization being a diffusion-controlled process.

Dimerization of 2, 6-diphenyl-4-methoxyphenoxyl radical in various solvents

Dimerization of 2, 6-diphenyl-4-methoxyphenoxyl radical in various solvents is limited by diffusion, with hexane, CCl4, toluene, dioxane, CHCl3 showing the slowest rate constant.