Superoxide radical anion adduct of 5,5-dimethyl-1-pyrroline N-oxide. 5. Thermodynamics and kinetics of unimolecular decomposition.
Superoxide radical anion adduct of 5,5-dimethyl-1-pyrroline N-oxide. 5. Thermodynamics and kinetics of unimolecular decomposition.
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5,5-二甲基-1-吡咯啉 N-氧化物的超氧自由基阴离子加合物。
DOI:
10.1021/jp902269t
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发表时间:
2009
期刊:
影响因子:
--
通讯作者:
Villamena,FrederickA
中科院分区:
文献类型:
--
作者:
Villamena,FrederickA
The unimolecular decomposition of the superoxide radical anion adducts of 5,5-dimethyl-1-pyrrolineN-oxide (DMPO), 5-carbamoyl-5-methyl-1-pyrrolineN-oxide (AMPO), 5-ethoxycarbonyl-5-methyl-1-pyrrolineN-oxide (EMPO), and 5-diethoxyphosphoryl-5-methyl-1-pyrrolineN-oxide (DEPMPO) were computationally investigated by using PCM/BHandLYP/6-311G(d,p)//B3LYP/6-31G(d) and PCM/ROMP2/cc-PVDZ//B3LYP/6-31G(d) levels of theory. Results indicate that the O−O bond scission for nitrone−O2H to form the hydroxyl radical and the biradical is endoergic, and that the ring-opening step to form the nitrosoaldehyde is highly exoergic. The energy barriers for the O−O bond scission and ring-opening processes indicate that the former is the rate-limiting step of the reaction. The overall energetics for DMPO−O2H decomposition in the presence and absence of explicit water interactions was found to be the most preferred; however, no significant differences in the energetics of decomposition among the various isomers of AMPO−O2H, EMPO−O2H, and DEPMPO−O2H were observed.
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DOI:
10.1021/jp0524330
发表时间:
2005-06
期刊:
The journal of physical chemistry. A
影响因子:
--
作者:
F. Villamena;John K. Merle;C. Hadad;J. Zweier
通讯作者:
F. Villamena;John K. Merle;C. Hadad;J. Zweier
DOI:
10.1021/jo049244i
发表时间:
2004-11
期刊:
The Journal of organic chemistry
影响因子:
--
作者:
F. Villamena;A. Rockenbauer;J. Gallucci;M. Velayutham;C. Hadad;J. Zweier
通讯作者:
F. Villamena;A. Rockenbauer;J. Gallucci;M. Velayutham;C. Hadad;J. Zweier
影响因子:
7.3
作者:
FREJAVILLE, C;KAROUI, H;TORDO, P
通讯作者:
TORDO, P
DOI:
10.1021/jp070679u
发表时间:
2007
期刊:
The journal of physical chemistry. A
影响因子:
--
作者:
A. Rockenbauer;J. Clément;M. Culcasi;A. Mercier;P. Tordo;S. Pietri
通讯作者:
S. Pietri
影响因子:
3.2
作者:
Krenske, Elizabeth H.;Schiesser, Carl H.
通讯作者:
Schiesser, Carl H.