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Volumn 17, Issue 5, 2011, Pages 1586-1595

Spin-trapping evidence for the formation of alkyl, alkoxyl, and alkylperoxyl radicals in the reactions of dialkylzincs with oxygen

Author keywords

dialkylzinc; EPR spectroscopy; oxygen; radical reactions; spin traps

Indexed keywords

ALKOXYL; ALKOXYL RADICALS; ALKYLPEROXYL RADICALS; BOND DISSOCIATION ENTHALPIES; DIALKYLZINC; EPR SPECTROSCOPY; EXPERIMENTAL CONDITIONS; RADICAL REACTIONS; RADICAL-ADDUCTS; REACTION MECHANISM; RELATIVE RATIOS; SPIN TRAPS; SPIN-ADDUCTS; SPIN-TRAPPING TECHNIQUE; THEORETICAL CALCULATIONS;

EID: 79251614528     PISSN: 09476539     EISSN: 15213765     Source Type: Journal    
DOI: 10.1002/chem.201002616     Document Type: Article
Times cited : (45)

References (109)
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    • This is consistent with the value reported in the literature for the trapping of tert-butoxyl or tert-butylperoxyl radicals in toluene (∼2.5a mT), see ref.a [18b]
    • This is consistent with the value reported in the literature for the trapping of tert-butoxyl or tert-butylperoxyl radicals in toluene (∼2.5a mT), see ref.a [18b].
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    • N ≥ 1.5a mT was observed under the same conditions with diethylzinc. The coupling constant is inconsistent with the trapping of an oxygen-centered radical species. At the moment we have no rationale for this experimental observation
    • N ≥ 1.5a mT was observed under the same conditions with diethylzinc. The coupling constant is inconsistent with the trapping of an oxygen-centered radical species. At the moment we have no rationale for this experimental observation.
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    • 2, oxygen is 20% molar with respect to dialkylzinc in experiments reported in entriesa 1-4. Oxygen is 2% molar in the experiments reported in entrya 5. The solubility of oxygen was evaluated from the mole fraction of oxygen (Ï) in various organic solvents, see.
    • 2, oxygen is 20% molar with respect to dialkylzinc in experiments reported in entriesa 1-4. Oxygen is 2% molar in the experiments reported in entrya 5. The solubility of oxygen was evaluated from the mole fraction of oxygen (Ï) in various organic solvents, see:, I. B. Golovanov, S. M. Zhenodarova, Russ. J. Gen. Chem. 2005, 75, 1795-1797.
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    • . by DMPO
    • . by DMPO, see
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    • -1 were reported for the trapping of the methyl and ethyl radicals by DMPO, respectively, see
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    • It must be underlined that all experiments reported in Tablea 1 led to reproducible data. All samples were prepared according to the protocol described in the Supporting Information
    • It must be underlined that all experiments reported in Tablea 1 led to reproducible data. All samples were prepared according to the protocol described in the Supporting Information.
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    • For a discussion of the factors controlling the reactivity of the methyl radical, see
    • For a discussion of the factors controlling the reactivity of the methyl radical, see
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    • In the case of dibutylzinc, 6% of radical D was detected. The possible origin of this nitroxide will be discussed later
    • In the case of dibutylzinc, 6% of radical D was detected. The possible origin of this nitroxide will be discussed later.
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    • This nitroxide was previously detected during the addition of organomagnesium compounds to DEPMPO, see: J.-L. Clément, DEA, Marseille, 1993
    • This nitroxide was previously detected during the addition of organomagnesium compounds to DEPMPO, see: J.-L. Clément, DEA, Marseille, 1993.
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    • At a high temperature (401a K) in chlorobenzene, the formation of D from DEPMPO was observed. According to the author (P.a G. Mekarbane, Ph. D. Thesis, Lancaster University (UK), 1998) D would result from a radical fragmentation process leading to the diethoxyphosphoryl radical that would be trapped by DEPMPO
    • At a high temperature (401a K) in chlorobenzene, the formation of D from DEPMPO was observed. According to the author (P.a G. Mekarbane, Ph. D. Thesis, Lancaster University (UK), 1998) D would result from a radical fragmentation process leading to the diethoxyphosphoryl radical that would be trapped by DEPMPO.
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    • For the sake of clarity, this reaction was neglected in the previous discussion
    • For the sake of clarity, this reaction was neglected in the previous discussion.
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    • 2Zn faded completely after 5a min. Again, the behavior of dibutylzinc was in between, but was much closer to that of diethylzinc than that of dimethylzinc
    • 2Zn faded completely after 5a min. Again, the behavior of dibutylzinc was in between, but was much closer to that of diethylzinc than that of dimethylzinc.
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    • 2 was used as a Lewis acid to promote the addition of MeOH to DEPMPO in the presence of air, no signal was detected even after 10a min
    • 2 was used as a Lewis acid to promote the addition of MeOH to DEPMPO in the presence of air, no signal was detected even after 10a min.
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    • The calculated NBO charges and their repercussion on the bond lengths are given in the Supporting Information
    • The calculated NBO charges and their repercussion on the bond lengths are given in the Supporting Information.


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