Takahisa Ichikawa, Nobuaki Ohta
1987
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Journal
International Journal of Radiation Applications and Instrumentation. Part C. Radiation Physics and Chemistry
Abstract
Abstract 3-Methylhexane-3d 1 yields mainly the two kinds of secondary radicals formed by C-H bond fission on positions 2 and 5 and the yields of both radicals are equal. The ESR spectra of 3-methylhexane-h 16 and 3-methyl-d 3 -hexane can also be explained by formation of the secondary radicals on positions 2 and 5. The tertiary radical produced by C-H bond rupture on position 3 in 3-methyl-d 3 -hexane is estimated as low as 20% to the total radicals trapped. 3-Methylhexane-2,2,4,4,5,5-d 6 and 3-methylhexane-2,2,3,4,4-d 5 produce the tertiary radical on position 3 and the secondary radical on position 5, respectively, indicating the isotope effect in the bond fission. 3-Methyl-2,2,4,4-d 4 yields the tertiary radical (75%) on position 3 and the secondary radical (25%) on position 5. Both n-pentane-h 12 and n-pentane-2,2,4,4-d 4 are found to yield the secondary radicals on position 2. Discussion is given for isotope effects in bond fission of alkanes.