Titration of Oxygen and Antioxidants Using 2,4,6-Tri-<i>tert</i>-butylphenoxy Free Radicals.

Paris, J. P.; Gorsuch, J. D.; Hercules, D. M.

doi:10.1021/ac60213a043

Cited by 17 publications

(6 citation statements)

References 12 publications

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“…The expected stoichiometry has not been found in all cases. The mole ratio for the reaction of I with 2,6di-í-butyl-4-dimethylaminomethylphenol was about 4, for hydroquinone it was 2.7, and for NDGA it varied between 3 and 5 (250). Certain phenols when oxidized with phenoxy radical form simple quinol ethers by intermolecular reaction and do not couple with the oxidizing agent.…”

Section: R= Aliphatic R" Alkyl Arylmentioning

confidence: 94%

“…Products of this reaction were not characterized. Reaction of I with p-phenylenediamine (250) showed a mole ratio of 3.11 ± 0.17 which indicated secondary reactions after the initial abstraction reaction to produce • . Treatment of a benzene solution of I with p-aminophenol was reported to give a mixture of I • H, unreacted p-aminophenol, and indophenols (XXXVIII) (246).…”

Section: Base and Aminesmentioning

confidence: 99%

“…Ascorbic Acid and Maleic Anhydride The reaction of this lactone with I has been mentioned (213) and a stoichiometry of 2:1 (I:ascorbic acid) suggested two hydrogen-abstraction steps involving I (250) (Eq 15).…”

Section: T H I S C O N T E N T Imentioning

confidence: 99%

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The Chemistry of Stable Phenoxy Radicals

Altwicker¹

1967

Chem. Rev.

262

189

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are closely related to phenoxy radicals but have a unique structural feature in that they are radical anions, will be mentioned only briefly. The chemistry of semiquinones has been the subject of an earlier review paper (202; for recent references cf. 58, 208, 313). Stable radicals based on polynuclear phenols (such as naphthols etc.) will be discussed.Electron spin resonance spectroscopy has contributed more than any other tool to the structural analysis of phenoxys and to the characterization of many new radicals. The results from esr work will be introduced where pertinent, but a detailed discussion of the many spectra that have been published is considered beyond the scope of this review. Excellent summaries of the esr method (232,325) and its application to phenoxy radicals have appeared (44,205).The literature has been reviewed through September 1966; a number of later references are included. III. Generation of Phenoxy RadicalsA.

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Section: R= Aliphatic R" Alkyl Arylmentioning

confidence: 94%

Section: Base and Aminesmentioning

confidence: 99%

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The Chemistry of Stable Phenoxy Radicals

Altwicker¹

1967

Chem. Rev.

262

189

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“…The titration of dissolved oxygen and several antioxidants with 2,4,6-fnierf-butylphenoxy free radicals was described by Paris, Gorsuch, and Hercules (162). Most of the measurements were spectrophotometric, of course, but they did report that nearly symmetrical potentiometric curves were obtained with a platinum indicator electrode in the titration of oxygen dissolved in several organic solvents.…”

Section: Reagents and Solventsmentioning

confidence: 99%

Potentiometric Titrations

Roe¹

1966

Anal. Chem.

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review includes potentiometric titrations and related de-velopments which became available during the period from December 1963 (14S) through November 1965. Publications are grouped into six major categories on the basis of emphasis alone.General reviews of the subject include a book by Ashworth (9) on organic analysis and a report by Headridge, Pierce, and Anderson (79). Redox methods were briefly covered byStephen ( 212), and to a greater extent by Zyka (244,245). TITRATION CURVES AND THEIR INTERPRETATIONAcid-Base Titrations. A fresh approach to the mathematical treatment of mono-and diprotic weak acidstrong base titration curves was developed by Stokes (213). He formu-

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“…Free radicals generated from 2,4,6tri-f-butyl phenol were used to titrate 2,6 -di -1 -butyladimethylaminop-cresol and 2,3-dimethyl tetramethylene-4',4"-dipvrocatechol (111). This method should be generally applicable to determination of stabilizers.…”

Section: Determinationmentioning

confidence: 99%

Rubber

Wadelin¹

1965

Anal. Chem.

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Titration of Oxygen and Antioxidants Using 2,4,6-Tri-tert-butylphenoxy Free Radicals.

Cited by 17 publications

References 12 publications

The Chemistry of Stable Phenoxy Radicals

The Chemistry of Stable Phenoxy Radicals

Potentiometric Titrations

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