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Volumn 138, Issue 16, 2016, Pages 5290-5298

Acid Is Key to the Radical-Trapping Antioxidant Activity of Nitroxides

Author keywords

[No Author keywords available]

Indexed keywords

ANTIOXIDANTS; CATALYSIS; CATALYST ACTIVITY; ELECTRON TRANSITIONS; IONS;

EID: 84966425170     PISSN: 00027863     EISSN: 15205126     Source Type: Journal    
DOI: 10.1021/jacs.6b00677     Document Type: Article
Times cited : (64)

References (54)
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  • 21
    • 0004099881 scopus 로고    scopus 로고
    • Wiley: Hoboken, NJ
    • This can be found throughout the literature, in particular, the two areas where nitroxide radical chemistry is particularly important. Radical polymerization: Matyjaszewski, K.; Davis, T. P. Handbook of Radical Polymerization; Wiley: Hoboken, NJ, 2002.
    • (2002) Handbook of Radical Polymerization
    • Matyjaszewski, K.1    Davis, T.P.2
  • 24
    • 70350022775 scopus 로고    scopus 로고
    • A role for the acid-mediated disproportionation of TEMPO to produce the corresponding hydroxylamine (and oxoammonium ion) was ruled out on kinetic grounds (see ref 13). However, it is also possible that the reaction takes place by a coupled proton-electron transfer, wherein a proton is transferred from the acid to the peroxyl radical concerted with the movement of an electron from TEMPO to the peroxyl. Since we found that there is a primary kinetic isotope effect on these reactions, a H atom must be in flight in the rate-determining step of the reaction, precluding any rapid pre-equilibrium between peroxyl and protonated peroxyl, such as that which is involved when phenols react with peroxyl radicals under acidic conditions. See
    • A role for the acid-mediated disproportionation of TEMPO to produce the corresponding hydroxylamine (and oxoammonium ion) was ruled out on kinetic grounds (see ref 13). However, it is also possible that the reaction takes place by a coupled proton-electron transfer, wherein a proton is transferred from the acid to the peroxyl radical concerted with the movement of an electron from TEMPO to the peroxyl. Since we found that there is a primary kinetic isotope effect on these reactions, a H atom must be in flight in the rate-determining step of the reaction, precluding any rapid pre-equilibrium between peroxyl and protonated peroxyl, such as that which is involved when phenols react with peroxyl radicals under acidic conditions. See: Valgimigli, L.; Amorati, R.; Petrucci, S.; Pedulli, G. F.; Hu, D.; Hanthorn, J. J.; Pratt, D. A. Angew. Chem., Int. Ed. 2009, 48, 8348-8351 10.1002/anie.200903360
    • (2009) Angew. Chem., Int. Ed. , vol.48 , pp. 8348-8351
    • Valgimigli, L.1    Amorati, R.2    Petrucci, S.3    Pedulli, G.F.4    Hu, D.5    Hanthorn, J.J.6    Pratt, D.A.7
  • 30
    • 84864339873 scopus 로고    scopus 로고
    • Baran has invoked this electron transfer in a mechanistic proposal for the guided desaturation of unactivated alkanes. See
    • Baran has invoked this electron transfer in a mechanistic proposal for the guided desaturation of unactivated alkanes. See: Voica, A.-F.; Mendoza, A.; Gutekunst, W. R.; Fraga, J. O.; Baran, P. S. Nat. Chem. 2012, 4, 629-635 10.1038/nchem.1385
    • (2012) Nat. Chem. , vol.4 , pp. 629-635
    • Voica, A.-F.1    Mendoza, A.2    Gutekunst, W.R.3    Fraga, J.O.4    Baran, P.S.5
  • 40
    • 84966426605 scopus 로고    scopus 로고
    • Manuscript in preparation
    • Shah, R.; Pratt, D. A. Manuscript in preparation.
    • Shah, R.1    Pratt, D.A.2
  • 42
    • 33646258061 scopus 로고    scopus 로고
    • Up to 2.7 M of 2,2,6,6-tetramethyl-1-(2-propenyloxy)piperidine had no detectable influence on the product distribution in a methyl linoleate clocking experiment, which was carried out as described in: Roschek, B.; Tallman, K. A.; Rector, C. L.; Gillmore, J. G.; Pratt, D. A.; Punta, C.; Porter, N. A. J. Org. Chem. 2006, 71, 3527-3532 10.1021/jo0601462
    • (2006) J. Org. Chem. , vol.71 , pp. 3527-3532
    • Roschek, B.1    Tallman, K.A.2    Rector, C.L.3    Gillmore, J.G.4    Pratt, D.A.5    Punta, C.6    Porter, N.A.7


* 이 정보는 Elsevier사의 SCOPUS DB에서 KISTI가 분석하여 추출한 것입니다.