What question did this study set out to answer?

To determine the reaction mechanism, rate constants, and activation energies of the phenoxy radical intermediate generated in the reaction between DPPH and 4-isopropyl-2,6-di-t-butylphenol.

December 15, 1967Canadian Journal of Chemistry

Kinetic studies of a phenoxy radical intermediate using optical and electron spin resonance spectroscopy

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To determine the reaction mechanism, rate constants, and activation energies of the phenoxy radical intermediate generated in the reaction between DPPH and 4-isopropyl-2,6-di-t-butylphenol.
Monitored intermediate radical formation and decay over time using optical and electron spin resonance (ESR) spectroscopy.
Evaluated reaction mechanisms by adding 2,2-diphenyl-1-picrylhydrazine (DPPH-H) to examine changes in intermediate production rates and maximum radical concentrations.
At 20 °C, the forward rate constant was 0.18 ± 0.02 l/(mole s), the reverse rate constant was 1.34 ± 0.2 l/(mole s), and the rate constant for phenoxyl reaction with DPPH was 0.68 ± 0.2 l/(mole s).
Calculated activation energies were 6.8 ± 0.6 kcal/mole for the primary forward reaction, 6.0 ± 1.0 kcal/mole for the reverse reaction, and 6.4 ± 1.5 kcal/mole for the secondary reaction between phenoxyl and DPPH.

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Implication

Kinetic investigation reveals reversible intermediate radical formation during DPPH-phenol reactions, highlighting the multi-step pathways of hindered phenoxyl decay.

Cite This Study

Ayscough et al. (1967) studied this question.

synapsesocial.com/papers/6a9e5b2ce8f591a3e79bc5ca https://doi.org/10.1139/v67-489

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Implication

Kinetic investigation reveals reversible intermediate radical formation during DPPH-phenol reactions, highlighting the multi-step pathways of hindered phenoxyl decay.

Kinetic studies of a phenoxy radical intermediate using optical and electron spin resonance spectroscopy

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Discussion

Implication

Cite This Study

Kinetic studies of a phenoxy radical intermediate using optical and electron spin resonance spectroscopy

Key Points

Discussion

Implication

Cite This Study

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