An electron spin resonance study of the second-order decay of 4-alkyl-2,6-di-t-butylphenoxyl radicals in solution
- 1 January 1974
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Perkin Transactions 2
- No. 2,p. 161-164
- https://doi.org/10.1039/p29740000161
Abstract
The decay of 4-methyl- and 4-ethyl-2,6-di-t-butylphenoxyl radicals in benzene solution is first-order at high radical concentrations and second-order at low radical concentrations. The concentration range in which the changeover from first- to second-order reaction occurs is determined by the equilibrium constant for quinol ether dimer formation from the phenoxyl radicals. Observed second-order rate constants at 22 °C for the loss of 4-methyl-, 4-ethyl-, and 4-isopropyl-2,6-di-t-butylphenoxyl radicals are, respectively, 2200, 500, and 2 I mol–1 s–1. The activation energy for the decay of 4-methyl-2,6-di-t-butylphenoxyl in benzene solution is 3·2 ± 0·3 kcal mol–1.Keywords
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