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- W2000396938 abstract "Calculations were carried out to study the validity of σ-scales for hydrogen abstraction from substituted toluenes by tert-butyl, tert-butoxyl and tert-butylperoxyl radicals. Rate constants were compiled and evaluated from the literature for meta- and/or para-substituted toluenes. The substituents were characterized by factored ionic sigmas (σI, σR, σ), ionic scales (σ, σ+) and various radical sigmas (σσ). The dependence of log k values on these substituent descriptors was investigated using ‘stepwise linear regression’ and ‘all possible regression’ methods. The following predictive equations can be recommended: for tert-butyl radicals, at 321 K: for tert-butoxyl radicals, at 313 K: and for tert-butylperoxyl radicals, at 303 K: The results suggest that there is no unversal radical scale for hydrogen abstraction reactions, that the rate is primarily influenced by polar factors (inductive, resonance) and that only two radical scales (σĊ and σ) are appropriate, showing a small, yet significant, role of radical stabilization." @default.
- W2000396938 created "2016-06-24" @default.
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- W2000396938 date "1994-05-01" @default.
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- W2000396938 title "Linear free energy relationships in radical reactions. II. hydrogen abstraction from substituted toluenes by<i>Tert</i>-Butyl,<i>Tert</i>-Butoxyl and<i>Tert</i>-Butylperoxyl radicals" @default.
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- W2000396938 doi "https://doi.org/10.1002/poc.610070505" @default.
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