EPR study of radical intermediates from the oxidation of 6-ethoxy-2,2,4-trimethyl- and 6-ethoxy-2,2,4,8-tetramethyl-1,2-dihydroquinoline

dc.creator	Gunstone, Frank D., Mordi, Raphael C., Thorission, Snorri, Walton, John C., Richard, Jackson A.
dc.date	1991
dc.date.accessioned	2025-03-28T16:30:56Z
dc.description	The EPR spectra of 1,2-dihydro-6-ethoxy-2,2,4-trimethyl- and 1,2-dihydro-6-ethoxy-2,2,4,8-tetramethyl-quinolin-1-yl radicals were observed in heptane solution. The hyperfine splittings showed that this class of radical is extensively delocalised with significant spin density at C(8). Both radicals decayed by second-order processes, the rate constants being 5 × 106 and 4 × 102 dm3 mol–1 s–1, respectively at 273 K. The latter reaction is much slower because the 8-methyl substituent blocks the formation of the 1,8′-dimer. Both radicals reacted with oxygen to give the corresponding nitroxides, although reaction was very slow for the 8-methyl derivative. A mechanism is proposed to rationalise product formation from 1,2-dihydro-6-ethoxy-2,2,4-trimethylquinoline when used as an antioxidant
dc.format	application/pdf
dc.identifier	http://eprints.covenantuniversity.edu.ng/5660/
dc.identifier.uri	https://repository.covenantuniversity.edu.ng/handle/123456789/35030
dc.language	en
dc.subject	QD Chemistry
dc.title	EPR study of radical intermediates from the oxidation of 6-ethoxy-2,2,4-trimethyl- and 6-ethoxy-2,2,4,8-tetramethyl-1,2-dihydroquinoline
dc.type	Article

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