Abstract
SUBSTITUTED phenoxyl radicals derived from 2,6-di-tertiary butyl phenols by lead dioxide oxidation or photolysis are quite stable and particularly suitable for examination by electron spin resonance1,2. The experimental results indicate that the spin distribution in the aromatic ring is not very sensitive to alkyl substituents and that a hyper conjugatively coupled methyl-type proton in the 4 position should have a hyperfine coupling constant of about 10 gauss. However, the 2,6-di-tertiary butyl 4-cyclohexyl phenoxyl radical has a coupling constant of about 4.5 gauss (at room temperature) for the single α-proton of the cyclohexyl ring3.
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ATHERTON, N., HARDING, R. Temperature-dependent Hyperfine Splitting in a Sterically Hindered Radical. Nature 198, 987–988 (1963). https://doi.org/10.1038/198987a0
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DOI: https://doi.org/10.1038/198987a0
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