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Leitão EFV, Angelo Fonseca de Souza M, do Monte SA, Ventura E. Competition between electron transfer and base-induced elimination mechanisms in the gas-phase reactions of superoxide with alkyl hydroperoxides. Phys Chem Chem Phys 2021; 23:5583-5595. [PMID: 33655284 DOI: 10.1039/d0cp05761d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Understanding the mechanism responsible for peroxides decomposition is essential to explain several biochemical processes. The mechanisms of the intrinsic reactions between the superoxide radical anion (O2˙-) and methyl, ethyl, and tert-butyl hydroperoxides (ROOH, with R = Me, Et, and t-Bu) have been characterized to understand the mechanism responsible for peroxides decomposition. The reaction energy diagrams suggest a competition between the spin-allowed and spin-forbidden electron transfer (ET), and base-induced elimination (ECO2) mechanisms. In all cases, the spin-allowed ET mechanism describes formation of the ozonide anion radical (O3˙-), either complexed with an alcohol molecule or separated. For the O2˙-/MeOOH(EtOOH) reactions, HCO2- (MeCO2-) + H2O + HO˙ and OH- + CH2O(MeCHO) + HO2˙ products are associated with the spin-forbidden ET and ECO2 channels, respectively. On the other hand, for the reaction between O2˙- and t-BuOOH, the spin-forbidden ET route describes formation of the MeCOCH2- enolate (either separated or hydrated) along with the methyl peroxyl (MeO2˙) radical. In addition, the regeneration of O2˙-via spin-forbidden ET and ECO2 channels was also characterized from the decomposition of ROOH, yielding diols (CH2(OH)2 and MeCH(OH)2), aldehydes (CH2O and MeCHO), and oxirane (cyc-CH2CMe2O).
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Affiliation(s)
- Ezequiel Fragoso Vieira Leitão
- Unidade Acadêmica de Ciências Exatas e da Natureza, Universidade Federal de Campina Grande, Cajazeiras, PB 58900-000, Brazil.
| | | | - Silmar Andrade do Monte
- Departamento de Química, CCEN, Universidade Federal da Paraíba, João Pessoa, PB 58-059-900, Brazil
| | - Elizete Ventura
- Departamento de Química, CCEN, Universidade Federal da Paraíba, João Pessoa, PB 58-059-900, Brazil
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Kayanuma M, Suzuki S, Choe YK, Shimoi Y. Structure dependency of the reactivity of aromatic hydrocarbons involving the formation of oxygenated polycyclic aromatic hydrocarbons (OPAHs). Chem Phys Lett 2020. [DOI: 10.1016/j.cplett.2020.137652] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Hu X, Yu J, Jiang S, Gao Y, Sun F. Naphthalimide derivatives containing benzyl-sulfur bond as cleavable photoinitiators for near-UV LED polymerization. J Sulphur Chem 2020. [DOI: 10.1080/17415993.2020.1795175] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- Xiuyuan Hu
- College of Chemistry, Beijing University of Chemical Technology, Beijing, People’s Republic of China
| | - Jia Yu
- Liming Research Institute of Chemical Industry, Luoyang, People’s Republic of China
| | - Shengling Jiang
- College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- Key Laboratory of Carbon Fiber and Functional Polymers, Ministry of Education (Beijing University of Chemical Technology), Beijing, People’s Republic of China
| | - Yanjing Gao
- College of Chemistry, Beijing University of Chemical Technology, Beijing, People’s Republic of China
| | - Fang Sun
- College of Chemistry, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- State Key Laboratory of Chemical Resource Engineering, Beijing University of Chemical Technology, Beijing, People’s Republic of China
- Anqing Research Institute, Beijing University of Chemical Technology, Anqing, People’s Republic of China
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Asatryan R, Pal Y, Hachmann J, Ruckenstein E. Roaming-like Mechanism for Dehydration of Diol Radicals. J Phys Chem A 2018; 122:9738-9754. [DOI: 10.1021/acs.jpca.8b08690] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Rubik Asatryan
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Yudhajit Pal
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
- Computational and Data-Enabled Science and Engineering Graduate Program, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Johannes Hachmann
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
- New York State Center of Excellence in Materials Informatics, Buffalo, New York 14203, United States
- Computational and Data-Enabled Science and Engineering Graduate Program, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
| | - Eli Ruckenstein
- Department of Chemical and Biological Engineering, University at Buffalo, The State University of New York, Buffalo, New York 14260, United States
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Bao JL, Truhlar DG. Variational transition state theory: theoretical framework and recent developments. Chem Soc Rev 2017; 46:7548-7596. [DOI: 10.1039/c7cs00602k] [Citation(s) in RCA: 207] [Impact Index Per Article: 29.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This article reviews the fundamentals of variational transition state theory (VTST), its recent theoretical development, and some modern applications.
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Affiliation(s)
- Junwei Lucas Bao
- Department of Chemistry
- Chemical Theory Center, and Minnesota Supercomputing Institute
- University of Minnesota
- Minneapolis
- USA
| | - Donald G. Truhlar
- Department of Chemistry
- Chemical Theory Center, and Minnesota Supercomputing Institute
- University of Minnesota
- Minneapolis
- USA
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Shapero M, Cole-Filipiak NC, Haibach-Morris C, Neumark DM. Benzyl Radical Photodissociation Dynamics at 248 nm. J Phys Chem A 2015; 119:12349-56. [DOI: 10.1021/acs.jpca.5b07125] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mark Shapero
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Neil C. Cole-Filipiak
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Courtney Haibach-Morris
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Daniel M. Neumark
- Chemical
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
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Li C, Lam AKY, Khairallah GN, White JM, O'Hair RAJ, da Silva G. Using distonic radical ions to probe the chemistry of key combustion intermediates: the case of the benzoxyl radical anion. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2013; 24:493-501. [PMID: 23512425 DOI: 10.1007/s13361-013-0596-y] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2012] [Revised: 02/20/2013] [Accepted: 02/20/2013] [Indexed: 06/01/2023]
Abstract
The benzoxyl radical is a key intermediate in the combustion of toluene and other aromatic hydrocarbons, yet relatively little experimental work has been performed on this species. Here, a combination of electrospray ionization (ESI), multistage mass spectrometry experiments, and density functional theory (DFT) calculations are used to examine the formation and fragmentation of a benzoxyl (benzyloxyl) distonic radical anion. Excited 4-carboxylatobenzoxyl radical anions were produced via two methods: (1) collision induced dissociation (CID) of the nitrate ester 4-(nitrooxymethyl)benzoate, (-)O2CC6H4CH2ONO2, and (2) reaction of ozone with the 4-carboxylatobenzyl radical anion, (-)O2CC6H4CH2(•). In neither case was the stabilized (-)O2CC6H4CH2O(•) radical anion intermediate detected. Instead, dissociation products at m/z 121 and 149 were observed. These products are attributed to benzaldehyde (O2(-)CC6H4CHO) and benzene ((-)O2CC6H5) products from respective loss of H and HCO radicals in the vibrationally excited benzoxyl intermediate. In no experiments was a product at m/z 120 (i.e., (-)O2CC6H4(•)) detected, corresponding to absence of the commonly assumed phenyl radical + CH2=O channel. The results reported suggest that distonic ions are useful surrogates for reactive intermediates formed in combustion chemistry.
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Affiliation(s)
- Cong Li
- School of Chemistry, The University of Melbourne, Melbourne, VIC, Australia
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