1990
DOI: 10.1016/0009-2614(90)85210-4
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Para-substituent effect upon the oxygenation reaction of the benzyl radical in solution

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Cited by 15 publications
(9 citation statements)
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“…The rate constants for the combination of O 2 with benzyl, p-fluorobenzyl, and p-methylbenzyl radicals in liquid hexane were also identical, but smaller values were found for other substituted benzyl radicals. 24 The enhancement of k 1 beyond the k 1,∞ ET value in the case of p-fluorobenzyl radicals, which was observed in the present work, qualitatively resembles that of benzyl radicals (see Figure 4). Quantitatively, however, its onset is observed to occur earlier for p-fluorobenzyl radicals (already at ∼5 bar) than for benzyl radicals (∼10 bar).…”
Section: Effect Of Fluorine-substitution Of Benzyl-type Radicals On Ksupporting
confidence: 78%
“…The rate constants for the combination of O 2 with benzyl, p-fluorobenzyl, and p-methylbenzyl radicals in liquid hexane were also identical, but smaller values were found for other substituted benzyl radicals. 24 The enhancement of k 1 beyond the k 1,∞ ET value in the case of p-fluorobenzyl radicals, which was observed in the present work, qualitatively resembles that of benzyl radicals (see Figure 4). Quantitatively, however, its onset is observed to occur earlier for p-fluorobenzyl radicals (already at ∼5 bar) than for benzyl radicals (∼10 bar).…”
Section: Effect Of Fluorine-substitution Of Benzyl-type Radicals On Ksupporting
confidence: 78%
“…Singh and coworkers reported that the radical constants for para substituted toluenes were in the order of NH 2 > NO 2 supporting the hypothesis that the formation of the benzylic radical is favoured in the presence of an amino substituent. 33,34 Scheme 5 Synthesis of 10j. In the presence of an additional aromatic ring, as in the case of 12a, the yield of SO 2 during photolysis is significantly higher when compared with 4a (Table 2).…”
Section: Resultsmentioning
confidence: 99%
“…It is well-established that the rate constant for reaction of the benzyl radical with O 2 is in the range of 3.0 × 10 9 M -1 s -1 . Since this is at least 1 order of magnitude faster than the recombination rate constant of two benzyl radicals (3−20) × 10 8 M -1 s -1 , ,27b benzylperoxy radical formation is more favorable than benzyl radical coupling.…”
Section: Resultsmentioning
confidence: 99%