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Khalifa S, Enomoto M, Nakagawa K. Unveiling an unexpected superoxide-mediated photooxidation mechanism of squalene monohydroperoxides to squalene hydroperoxy cyclic peroxides through ESR and LC-MS/MS analyses. Sci Rep 2023; 13:19525. [PMID: 37945632 PMCID: PMC10636020 DOI: 10.1038/s41598-023-46044-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2023] [Accepted: 10/26/2023] [Indexed: 11/12/2023] Open
Abstract
Lipid cyclic peroxides are a rarely reported and documented class of compounds in the human organism. Recently, we reported the formation of squalene (SQ) hydroperoxy cyclic peroxides derived from SQ monohydroperoxide isomers (SQ-OOHs) for the first time. Notably, we successfully detected and quantified cis-2-OOH-3-(1,2-dioxane)-SQ in the human skin. Nevertheless, the underlying mechanism governing the formation of these compounds remained elusive. Therefore, in the current study, we set to determine the reaction's mechanism. To this end, a comprehensive analysis of the precise conditions involved in the onset and propagation of this conversion was carried out by oxidizing total SQ-OOHs under different conditions, including singlet oxygen (1O2), thermal, and photoinduced oxidations monitored by quantifying the generated 2-OOH-3-(1,2-dioxane)-SQ using liquid chromatography-tandem mass spectrometry (LC-MS/MS). Radical intermediates were thoroughly investigated using Electron Spin Resonance (ESR) with the aid of spin traps and radical references. Moreover, calculations of SQ-OOHs' electrostatic charges were performed on Spartan 18 software. We found that the reaction is ideally induced and favored under photooxidation in the presence of 3O2 in hexane, and that superoxide radical (O2•-) is the first key intermediate in this mechanism, whereas peroxyl radicals were the major species observed throughout the oxidation. Chemical calculations provided an explanation for the targeting of tertiary SQ-OOHs by this reaction and gave further evidence on the proposed heterolytic cleavage initiating the reaction. The novel oxidation mechanism suggested herein offers new insights into understanding lipid secondary oxidation and is a promising finding for further studying lipid cyclic peroxides in general.
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Affiliation(s)
- Saoussane Khalifa
- Laboratory of Food Function Analysis, Graduate School of Agricultural Science, Tohoku University, Sendai, 980-8572, Japan
| | - Masaru Enomoto
- Applied Bioorganic Chemistry Laboratory, Graduate School of Agricultural Science, Tohoku University, Sendai, 980-8572, Japan
| | - Kiyotaka Nakagawa
- Laboratory of Food Function Analysis, Graduate School of Agricultural Science, Tohoku University, Sendai, 980-8572, Japan.
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9,10-Dihydroanthracene auto-photooxidation efficiently triggered photo-catalytic oxidation of organic compounds by molecular oxygen under visible light. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.111127] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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3
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Cindrić M, Sović I, Mioč M, Hok L, Boček I, Roškarić P, Butković K, Martin-Kleiner I, Starčević K, Vianello R, Kralj M, Hranjec M. Experimental and Computational Study of the Antioxidative Potential of Novel Nitro and Amino Substituted Benzimidazole/Benzothiazole-2-Carboxamides with Antiproliferative Activity. Antioxidants (Basel) 2019; 8:antiox8100477. [PMID: 31614731 PMCID: PMC6826492 DOI: 10.3390/antiox8100477] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 10/02/2019] [Accepted: 10/08/2019] [Indexed: 11/16/2022] Open
Abstract
We present the synthesis of a range of benzimidazole/benzothiazole-2-carboxamides with a variable number of methoxy and hydroxy groups, substituted with nitro, amino, or amino protonated moieties, which were evaluated for their antiproliferative activity in vitro and the antioxidant capacity. Antiproliferative features were tested on three human cancer cells, while the antioxidative activity was measured using 1,1-diphenyl-picrylhydrazyl (DPPH) free radical scavenging and ferric reducing antioxidant power (FRAP) assays. Trimethoxy substituted benzimidazole-2-carboxamide 8 showed the most promising antiproliferative activity (IC50 = 0.6–2.0 µM), while trihydroxy substituted benzothiazole-2-carboxamide 29 was identified as the most promising antioxidant, being significantly more potent than the reference butylated hydroxytoluene BHT in both assays. Moreover, the latter also displays antioxidative activity in tumor cells. The measured antioxidative capacities were rationalized through density functional theory (DFT) calculations, showing that 29 owes its activity to the formation of two [O•∙∙∙H–O] hydrogen bonds in the formed radical. Systems 8 and 29 were both chosen as lead compounds for further optimization of the benzazole-2-carboxamide scaffold in order to develop more efficient antioxidants and/or systems with the antiproliferative activity.
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Affiliation(s)
- Maja Cindrić
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia.
| | - Irena Sović
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia.
| | - Marija Mioč
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia.
| | - Lucija Hok
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia.
| | - Ida Boček
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia.
| | - Petra Roškarić
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia.
| | - Kristina Butković
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia.
| | - Irena Martin-Kleiner
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia.
| | - Kristina Starčević
- Department of Chemistry and Biochemistry, Faculty of Veterinary Medicine, University of Zagreb, Heinzelova 55, HR-10000 Zagreb, Croatia.
| | - Robert Vianello
- Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia.
| | - Marijeta Kralj
- Division of Molecular Medicine, Ruđer Bošković Institute, Bijenička cesta 54, HR-10000 Zagreb, Croatia.
| | - Marijana Hranjec
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, HR-10000 Zagreb, Croatia.
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Huong DQ, Duong T, Nam PC. An experimental and computational study of antioxidant activity of N-phenylthiourea and N-phenylselenourea analogues. VIETNAM JOURNAL OF CHEMISTRY 2019. [DOI: 10.1002/vjch.201900091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Dinh Quy Huong
- Department of Chemistry; Hue's University College of Education- Hue University; Hue City 530000 Viet Nam
| | - Tran Duong
- Department of Chemistry; Hue's University College of Education- Hue University; Hue City 530000 Viet Nam
| | - Pham Cam Nam
- Department of Chemistry; University of Science and Technology-The University of Danang; Danang City 550000 Viet Nam
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Ngo TC, Nguyen TH, Dao DQ. Radical Scavenging Activity of Natural-Based Cassaine Diterpenoid Amides and Amines. J Chem Inf Model 2019; 59:766-776. [PMID: 30681326 DOI: 10.1021/acs.jcim.8b00847] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The radical scavenging capacities of four new cassaine diterpenoid amides including 3β-hydroxydinorerythrosuamide (1), 3β-acetoxydinorerythrosuamide (2), 3β-tigloyloxydinorerythrosuamide (3), and 6α-hydroxydinorcassamide (4) present in leaf extract and four new cassaine diterpenoid amines namely erythroformine A (5), erythroformine B (6), 6α-hydroxy-nor-cassamine (7), and nor-erythrosuamine (8) recently identified in the extract of the bark of Erythrophleum fordii were elucidated using density functional theory (DFT) method. Different thermochemical properties characterizing antioxidant potential including bond dissociation enthalpy (BDE), proton affinity (PA), and adiabatic ionization potential (IP) were calculated at the B3LYP/6-311G(d,p) level of theory. Scavenging reaction mechanisms of cassaine diterpenes toward HOO• radical including formal hydrogen transfer (FHT; either hydrogen atom transfer (HAT) or proton coupled electron transfer (PCET)), radical adduct formation (RAF), single electron transfer (SET), and proton transfer (PT) were studied in the gas phase, water, and benzene. The potential energy profiles and kinetic calculations for the FHT and RAF reactions were calculated at 298.15 K. The results showed that all the studied compounds present strong antioxidant activity via HAT mechanism with BDEs varying from 69.4 to 77.9 kcal/mol. While solvents have only a slight effect on HAT and RAF mechanisms, SET and PT reactions are likely to occur in polar media. Among the studied compounds, 3 is the most reactive one both for HAT (H-abstraction at C7, Δ H -11.3 kcal/mol) and for RAF (radical addition at C13 = C15 bond, Δ H -5.2 kcal/mol) reactions. The rate constants of these reactions are also comparable with several referenced antioxidants such as Trolox and ascorbic acid.
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Perin N, Roškarić P, Sović I, Boček I, Starčević K, Hranjec M, Vianello R. Amino-Substituted Benzamide Derivatives as Promising Antioxidant Agents: A Combined Experimental and Computational Study. Chem Res Toxicol 2018; 31:974-984. [DOI: 10.1021/acs.chemrestox.8b00175] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Nataša Perin
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
| | - Petra Roškarić
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
| | - Irena Sović
- Laboratory for Green Chemistry, Division of Physical Chemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
| | - Ida Boček
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
| | - Kristina Starčević
- Department of Animal Husbandry, Faculty of Veterinary Medicine, University of Zagreb, Heinzelova 55, 10000 Zagreb, Croatia
| | - Marijana Hranjec
- Department of Organic Chemistry, Faculty of Chemical Engineering and Technology, University of Zagreb, Marulićev trg 19, 10000 Zagreb, Croatia
| | - Robert Vianello
- Computational Organic Chemistry and Biochemistry Group, Division of Organic Chemistry and Biochemistry, Ruđer Bošković Institute, Bijenička cesta 54, 10000 Zagreb, Croatia
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7
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Kärkäs MD. Electrochemical strategies for C-H functionalization and C-N bond formation. Chem Soc Rev 2018; 47:5786-5865. [PMID: 29911724 DOI: 10.1039/c7cs00619e] [Citation(s) in RCA: 588] [Impact Index Per Article: 98.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Conventional methods for carrying out carbon-hydrogen functionalization and carbon-nitrogen bond formation are typically conducted at elevated temperatures, and rely on expensive catalysts as well as the use of stoichiometric, and perhaps toxic, oxidants. In this regard, electrochemical synthesis has recently been recognized as a sustainable and scalable strategy for the construction of challenging carbon-carbon and carbon-heteroatom bonds. Here, electrosynthesis has proven to be an environmentally benign, highly effective and versatile platform for achieving a wide range of nonclassical bond disconnections via generation of radical intermediates under mild reaction conditions. This review provides an overview on the use of anodic electrochemical methods for expediting the development of carbon-hydrogen functionalization and carbon-nitrogen bond formation strategies. Emphasis is placed on methodology development and mechanistic insight and aims to provide inspiration for future synthetic applications in the field of electrosynthesis.
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Affiliation(s)
- Markus D Kärkäs
- Department of Chemistry, Organic Chemistry, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
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8
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Rafiee M, Wang F, Hruszkewycz DP, Stahl SS. N-Hydroxyphthalimide-Mediated Electrochemical Iodination of Methylarenes and Comparison to Electron-Transfer-Initiated C-H Functionalization. J Am Chem Soc 2017; 140:22-25. [PMID: 29220181 DOI: 10.1021/jacs.7b09744] [Citation(s) in RCA: 130] [Impact Index Per Article: 18.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
An electrochemical method has been developed for selective benzylic iodination of methylarenes. The reactions feature the first use of N-hydroxyphthalimide as an electrochemical mediator for C-H oxidation to nonoxygenated products. The method provides the basis for direct (in situ) or sequential benzylation of diverse nucleophiles using methylarenes as the alkylating agent. The hydrogen-atom transfer mechanism for C-H iodination allows C-H oxidation to proceed with minimal dependence on the substrate electronic properties and at electrode potentials 0.5-1.2 V lower than that of direct electrochemical C-H oxidation.
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Affiliation(s)
- Mohammad Rafiee
- Department of Chemistry, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Fei Wang
- Department of Chemistry, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Damian P Hruszkewycz
- Department of Chemistry, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
| | - Shannon S Stahl
- Department of Chemistry, University of Wisconsin-Madison , 1101 University Avenue, Madison, Wisconsin 53706, United States
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9
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DFT/B3LYP study of the solvent effect on the reaction enthalpies of homolytic and heterolytic OH bond cleavage in mono-substituted chromans. COMPUT THEOR CHEM 2011. [DOI: 10.1016/j.comptc.2011.09.014] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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10
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LI SONGNIAN, WANG LUOXIN, LIU YONG, TUO XINLIN, WANG XIAOGONG. HOMOLYTIC C–H BOND DISSOCIATION ENERGIES OF HTPB BINDER NETWORK. JOURNAL OF THEORETICAL & COMPUTATIONAL CHEMISTRY 2011. [DOI: 10.1142/s0219633609004848] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The C – H bond dissociation energies (BDEs) of hydroxyl-terminated polybutadiene (HTPB) binder have been computed using ab initio and density functional theory methods. Five different HTPB carbon radicals were produced by the ruptures of different C – H bonds. The structural analysis of radicals and the calculated BDEs showed that the studied C – H bonds could be divided into three groups. It was found that the weakest C – H bonds were those on the tertiary carbon atom linked to a vinyl function. The next were those on the secondary carbon attached to a vinyl function. The dissociation of these two kinds of C – H bonds determines the structure of the ultimate products during the aging of HTPB binder. The most stable C – H bonds were those in the methylene that were attached to the saturated carbon atoms.
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Affiliation(s)
- SONGNIAN LI
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, P. R. China
| | - LUOXIN WANG
- Key Laboratory of Green Processing and Functional Textiles of New Textile Materials, Wuhan University of Science and Engineering, Ministry of Education, Wuhan 430073, P. R. China
| | - YONG LIU
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, P. R. China
| | - XINLIN TUO
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, P. R. China
| | - XIAOGONG WANG
- Department of Chemical Engineering, Tsinghua University, Beijing 100084, P. R. China
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11
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Sharp TR. Calculated carbon–hydrogen bond dissociation enthalpies for predicting oxidative susceptibility of drug substance molecules. Int J Pharm 2011; 418:304-17. [DOI: 10.1016/j.ijpharm.2011.04.063] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2010] [Revised: 04/19/2011] [Accepted: 04/26/2011] [Indexed: 10/18/2022]
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12
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Sadasivam K, Kumaresan R. Antioxidant behavior of mearnsetin and myricetin flavonoid compounds--a DFT study. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2011; 79:282-93. [PMID: 21420896 DOI: 10.1016/j.saa.2011.02.042] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/28/2011] [Accepted: 02/16/2011] [Indexed: 05/10/2023]
Abstract
The molecular characteristics of two naturally occurring flavonoid compounds mearnsetin and myricetin have been computed using density functional theory (DFT) approach with B3LYP/6-311G(d,p) level of theory. The computation and analysis of bond dissociation enthalpy magnitudes for all the OH sites for both the compounds clearly denotes the contribution of the B-ring for the antioxidant activity. The analysis has also indicated the higher values of BDE on the C5-OH radical species in both the compounds. The computed vibrational frequency analysis indicates the absence of imaginary frequency in the neutral as well as radical species of both the flavonoid compounds. The ionisation potential (IP) analysis was found to be within the range of the IP of synthetic food additives. In addition, various molecular descriptors such as electron affinity, hardness, softness, electronegativity, electrophilic index have also been calculated and the validity of Koopman's theorem is verified. The plot of frontier molecular orbital and spin density distribution analysis for neutral and the corresponding radical species for both the compounds have been computed and interpreted. The polar nature and their polarizing capacity are well established through the analysis of dipole moment and polarisability magnitudes.
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Affiliation(s)
- K Sadasivam
- Department of Physics, Bannari Amman Institute of Technology (Autonomous), Sathyamangalam, Erode, Tamil Nadu, India
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13
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Zhu XQ, Wang CH, Liang H. Scales of oxidation potentials, pK(a), and BDE of various hydroquinones and catechols in DMSO. J Org Chem 2011; 75:7240-57. [PMID: 20873851 DOI: 10.1021/jo101455m] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The one-electron oxidation potentials [E(ox)(NHE)(H(2)Q)], pK(a) (pK(a1) and pK(a2)) values, and bond dissociation energies (BDE(1) and BDE(2)) of 118 important p- and o-dihydroquinones in DMSO were systematically predicted for the first time by using DFT method and the PCM cluster continuum model. The calculated results agree well with the available experimental determinations. The study shows that all the five thermodynamic parameters correlate well with the Hammett substituent parameters σ(p) (for p-H(2)Q, E(ox)(NHE)(H(2)Q(·+)/H(2)Q) = 1.66Σσ(p) + 0.54, pK(a1) = -5.69Σσ(p) + 16.54, pK(a2) = -5.19Σσ(p) + 23.91, BDE(1) = 3.43Σσ(p) + 82.29, BDE(2) = 4.64Σσ(p) + 67.70 and for o-H(2)Q, E(ox)(NHE)(H(2)Q(·+)/H(2)Q) = 1.85Σσ(p) + 0.46, pK(a1) = -5.53Σσ(p) + 13.28, pK(a2) = -5.24Σσ(p) + 26.70, BDE(1) = 3.54Σσ(p) + 82.08, BDE(2) = 3.82Σσ(p) + 75.93), which hints that we can get these thermodynamic parameters as long as the structure of the hydroquinones were known. The comparisons of the calculated five thermodynamic parameters between p-hydroquinones and o-hydroquinones and the number of the phenyl ring effects on these thermodynamic parameters were also studied. At last, intramolecular hydrogen bond energies in hydroquinones at neutral, radical cation, radical, anion different state were systematically calculated and analyzed. Combined with the papers published in our group before, we will have a systematic thermodynamic picture of the transfer details between different kinds of quinones and corresponding hydroquinones, which strongly promote the fast development of the understanding and applications of quinones.
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Affiliation(s)
- Xiao-Qing Zhu
- State Key Laboratory of Elemento-Organic Chemistry, Department of Chemistry, Nankai University, Tianjin 300071, China.
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14
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Zeng M, Du Y, Shao L, Qi C, Zhang XM. Palladium-Catalyzed Reductive Homocoupling of Aromatic Halides and Oxidation of Alcohols. J Org Chem 2010; 75:2556-63. [DOI: 10.1021/jo100089d] [Citation(s) in RCA: 70] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Minfeng Zeng
- Institute of Applied Chemistry and Department of Chemistry, University of Shaoxing, Shaoxing, Zhejiang Province 312000, People’s Republic of China
| | - Yijun Du
- Institute of Applied Chemistry and Department of Chemistry, University of Shaoxing, Shaoxing, Zhejiang Province 312000, People’s Republic of China
| | - Linjun Shao
- Institute of Applied Chemistry and Department of Chemistry, University of Shaoxing, Shaoxing, Zhejiang Province 312000, People’s Republic of China
| | - Chenze Qi
- Institute of Applied Chemistry and Department of Chemistry, University of Shaoxing, Shaoxing, Zhejiang Province 312000, People’s Republic of China
| | - Xian-Man Zhang
- Institute of Applied Chemistry and Department of Chemistry, University of Shaoxing, Shaoxing, Zhejiang Province 312000, People’s Republic of China
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15
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DFT study on the reactivity of OH groups in emodin: structural and electronic features of emodin radicals. MONATSHEFTE FUR CHEMIE 2009. [DOI: 10.1007/s00706-009-0192-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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16
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Guan X, Du Y, Xue J, Phillips DL. Density Functional Theory and Time-Resolved Resonance Raman Investigation of the Photocyclization of 2-Pyridyl Phenyl Ketone in Acid Solution. J Phys Chem A 2009; 113:1999-2003. [DOI: 10.1021/jp808532n] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiangguo Guan
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Yong Du
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - Jiadan Xue
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
| | - David Lee Phillips
- Department of Chemistry, The University of Hong Kong, Pokfulam Road, Hong Kong, P. R. China
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17
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Hemelsoet K, Speybroeck VV, Waroquier M. Bond Dissociation Enthalpies of Large Aromatic Carbon-Centered Radicals. J Phys Chem A 2008; 112:13566-73. [DOI: 10.1021/jp801551c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Karen Hemelsoet
- Center for Molecular Modeling, Ghent University, Proeftuinstraat 86, 9000 Gent, Belgium
| | | | - Michel Waroquier
- Center for Molecular Modeling, Ghent University, Proeftuinstraat 86, 9000 Gent, Belgium
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18
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Altarawneh M, Dlugogorski BZ, Kennedy EM, Mackie JC. Quantum Chemical and Kinetic Study of Formation of 2-Chlorophenoxy Radical from 2-Chlorophenol: Unimolecular Decomposition and Bimolecular Reactions with H, OH, Cl, and O2. J Phys Chem A 2008; 112:3680-92. [DOI: 10.1021/jp712168n] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Mohammednoor Altarawneh
- Process Safety and Environment Protection Research Group, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Bogdan Z. Dlugogorski
- Process Safety and Environment Protection Research Group, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - Eric M. Kennedy
- Process Safety and Environment Protection Research Group, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia
| | - John C. Mackie
- Process Safety and Environment Protection Research Group, School of Engineering, The University of Newcastle, Callaghan, NSW 2308, Australia
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20
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Bakalbassis EG, Lithoxoidou AT, Vafiadis AP. Theoretical insights, in the liquid phase, into the antioxidant mechanism-related parameters in the 2-monosubstituted phenols. J Phys Chem A 2007; 110:11151-9. [PMID: 16986850 DOI: 10.1021/jp061718p] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The paper describes a DFT/B3LYP study, in the liquid phase, [using the PCM continuum model] on the O-H bond dissociation enthalpy (BDE) and ionization energy (IE) parameter values of the 2-monosubstituted phenols (2-X-ArOH), related to the H-atom transfer (HAT) and single-electron transfer (SET) mechanisms. The solvent and substituent effects on the conformers, the BDEs, and the IEs were studied using four electron-donating (EDG) and five electron-withdrawing (EWG) groups, in seven different solvents. In both the EDG- and/or EWG-substituted species of the parent compounds, radicals, and/or cation radicals, the most stable conformer is varied, depending on the medium and the substitution. The EWG-substituents increase IEs, resulting in a weaker antioxidant activity than the EDG ones; the effect appears stronger on the IEs than on BDEs. However, although the liquid-phase IEs, which are related to solution-phase oxidation potentials, decrease with the polarity and/or the hydrogen-bonding ability of the solvent, the opposite holds true for the BDEs, exhibiting a weaker effect. The gas-phase-calculated IE for benzene is among the most accurate ones in the field, compared to the experiment, that for phenol being the most accurate. In addition, calculated IEs for the 2-X-ArOH are in close agreement with the very few existing experimental ones. It is shown that the oxidation potentials are (a) highly correlated with the gas-phase ones, and (b) strongly solvent dependent. The stabilization/destabilization of the cation radical (SPC) contribution, in all media, is the decisive factor in the DeltaIE calculation. The reasonable correlations found between the DeltaBDE and DeltaIE could account well for the assumption of the simultaneous action of both mechanisms in the 2-X-ArOH, in both the gas and the liquid phase. It seems, however, that the presence of a particular solvent by itself is not sufficient enough for the HAT to SET transition. The involvement of specific ED and/or EW groups in the 2-X-ArOH seems also necessary. It appears that our theoretical approach is not only generally applicable to the set of substituents important to antioxidant activity but also useful in (a) the rational design of phenolic antioxidants and (b) affording accurate BDE and IE parameter values related to both possible antioxidant mechanisms.
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Affiliation(s)
- Evangelos G Bakalbassis
- Laboratory of Applied Quantum Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 541 24 Thessaloniki, Greece.
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21
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Bally T, Borden WT. Calculations on Open-Shell Molecules: A Beginner's Guide. REVIEWS IN COMPUTATIONAL CHEMISTRY 2007. [DOI: 10.1002/9780470125908.ch1] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/22/2023]
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22
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A DFT study of the reactivity of OH groups in quercetin and taxifolin antioxidants: The specificity of the 3-OH site. Food Chem 2006. [DOI: 10.1016/j.foodchem.2005.05.042] [Citation(s) in RCA: 262] [Impact Index Per Article: 14.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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23
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Guan X, Phillips DL, Yang D. A Density Functional Theory Study of the 5-Exo Cyclization Reactions of α-Substituted 6,6-Diphenyl-5-hexenyl Radicals. J Org Chem 2006; 71:1984-8. [PMID: 16496984 DOI: 10.1021/jo052328m] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Density functional theory computations were done to study the 5-exo radical cyclization reactions of alpha-substituted 6,6-diphenyl-5-hexenyl radicals. The methoxy electron donor group substitution reduced the barrier to reaction by about 0.5 kcal/mol. On the other hand, the electron acceptor group substitutions (ethoxycarbonyl, carboxylic acid, carboxylate, and cyano) raised the barrier to reaction by varying amounts (0.5-2.1 kcal /mol). The entropic terms of these cyclization reactions are briefly discussed. Solvent effects on these reactions were explored by calculations that included a polarizable continuum model for the solvent. The density functional theory calculated results were found to be in good agreement with the experimental data available in the literature and help to explain some of the observed variation in these types of cyclization reactions with various substitutions. Our results also provide an explanation for why the rate constant for the carboxylate group substituted radical was found to be an order of magnitude smaller than the rate constant for those radicals with carboxylic acid and ethoxycarbonyl substitutions.
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Affiliation(s)
- Xiangguo Guan
- Department of Chemistry, University of Hong Kong, Pokfulam Road, Hong Kong, PR China
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24
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Fu Y, Liu L, Yu HZ, Wang YM, Guo QX. Quantum-Chemical Predictions of Absolute Standard Redox Potentials of Diverse Organic Molecules and Free Radicals in Acetonitrile. J Am Chem Soc 2005; 127:7227-34. [PMID: 15884964 DOI: 10.1021/ja0421856] [Citation(s) in RCA: 266] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A calibrated B3LYP/6-311++G(2df,2p)//B3LYP/6-31+G(d) method was found to be able to predict the gas-phase adiabatic ionization potentials of 160 structurally unrelated organic molecules with a precision of 0.14 eV. A PCM solvation model was benchmarked that could predict the pK(a)'s of 15 organic acids in acetonitrile with a precision of 1.0 pK(a) unit. Combining the above two methods, we developed a generally applicable protocol that could successfully predict the standard redox potentials of 270 structurally unrelated organic molecules in acetonitrile. The standard deviation of the predictions was 0.17 V. The study demonstrated that computational electrochemistry could become a powerful tool for the organic chemical community. It also confirmed that the continuum solvation theory could correctly predict the solvation energies of organic radicals. Finally, with the help of the newly developed protocol we were able to establish a scale of standard redox potentials for diverse types of organic free radicals for the first time. Knowledge about these redox potentials should be of great value for understanding the numerous electron-transfer reactions in organic and bioorganic chemistry.
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Affiliation(s)
- Yao Fu
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
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25
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Trouillas P, Fagnère C, Lazzaroni R, Calliste C, Marfak A, Duroux JL. A theoretical study of the conformational behavior and electronic structure of taxifolin correlated with the free radical-scavenging activity. Food Chem 2004. [DOI: 10.1016/j.foodchem.2004.02.009] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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26
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Yao XQ, Hou XJ, Jiao H, Xiang HW, Li YW. Accurate Calculations of Bond Dissociation Enthalpies with Density Functional Methods. J Phys Chem A 2003. [DOI: 10.1021/jp0361125] [Citation(s) in RCA: 98] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Xiao-Qian Yao
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China, and Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
| | - Xin-Juan Hou
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China, and Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
| | - Haijun Jiao
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China, and Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
| | - Hong-Wei Xiang
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China, and Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
| | - Yong-Wang Li
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan 030001, P. R. China, and Leibniz-Institut für Organische Katalyse an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
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27
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Fukuzumi S, Shimoosako K, Suenobu T, Watanabe Y. Mechanisms of Hydrogen-, Oxygen-, and Electron-Transfer Reactions of Cumylperoxyl Radical. J Am Chem Soc 2003; 125:9074-82. [PMID: 15369364 DOI: 10.1021/ja035156o] [Citation(s) in RCA: 82] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Rates of hydrogen-transfer reactions from a series of para-substituted N,N-dimethylanilines to cumylperoxyl radical and oxygen-transfer reactions from cumylperoxyl radical to a series of sulfides and phosphines have been determined in propionitrile (EtCN) and pentane at low temperatures by use of ESR. The observed rate constants exhibit first-order and second-order dependence with respect to concentrations of N,N-dimethylanilines. This indicates that the hydrogen- and oxygen-transfer reactions proceed via 1:1 charge-transfer (CT) complexes formed between the substrates and cumylperoxyl radical. The primary kinetic isotope effects are determined by comparing the rates of N,N-dimethylanilines and the corresponding N,N-bis(trideuteriomethyl)anilines. The isotope effect profiles are quite different from those reported for the P-450 model oxidation of the same series of substrates. Rates of electron-transfer reactions from ferrocene derivatives to cumylperoxyl radical have also been determined by use of ESR. The catalytic effects of Sc(OTf)(3) (OTf = triflate) on the electron-transfer reactions are compared with those of Sc(OTf)(3) on the hydrogen- and oxygen-transfer reactions. Such comparison provides strong evidence that the hydrogen- and oxygen- transfer reactions of cumylperoxyl radical proceed via a one-step hydrogen atom and oxygen atom transfer rather than via an electron transfer from substrates to cumylperoxyl radical.
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Affiliation(s)
- Shunichi Fukuzumi
- Contribution from the Department of Material and Life Science, Graduate School of Engineering, Osaka University, CREST, Japan Science and Technology Corporation (JST), Suita, Osaka 565-0871, Japan.
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28
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Fu Y, Liu L, Lin BL, Mou Y, Cheng YH, Guo QX. Remote substituent effects on homolytic bond dissociation energies. J Org Chem 2003; 68:4657-62. [PMID: 12790568 DOI: 10.1021/jo034094h] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the study we tried to answer two questions. First, does X-Z homolytic bond dissociation energy (BDE) of Y-C6H4-X-Z obey the Hammett relationship? Second, if it does what factors determine the magnitude and sign of the slope (rho+) of Hammett regression against substituent sigma(p)(+) constants? We collected a large number of X-Z BDEs for over one-thousand Y-C6H4-X-Z systems using the RMP2/6-311++G**//UB3LYP/6-31G* method. We found that remote substituent effects on X-Z BDEs are determined by both the ground effect (i.e. stabilization/destabilization of X-Z by the substituents) and the radical effect (i.e. stabilization/destabilization of X. by the substituents). The ground or radical effect is determined by the electron demand of X-Z or X. in the same way as the deprotonation enthalpy of HOOC-C6H4-X-Z or HOOC-C6H4-X. is affected by X-Z or X. . As a result, rho+ (BDE) for X-Z bond homolysis can be quantitatively predicted by using the change in deprotonation enthalpy from HOOC-C6H4-X-Z to HOOC-C6H4-X. .
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Affiliation(s)
- Yao Fu
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, China
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29
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Fu Y, Lin BL, Liu L, Guo QX. B—Z bond dissociation energies of para-substituted phenylboranes: a problem for Nau's definition of polar ground-state effects. RESEARCH ON CHEMICAL INTERMEDIATES 2003. [DOI: 10.1163/156856703765694363] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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30
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Song KS, Liu L, Guo QX. Remote substituent effects on N-X (X = H, F, Cl, CH3, Li) bond dissociation energies in para-substituted anilines. J Org Chem 2003; 68:262-6. [PMID: 12530847 DOI: 10.1021/jo0204146] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
UB3LYP/6-311++g**//UB3LYP/6-31+g* and ROMP2/6-311++g**//UB3LYP/6-31+g* methods were used to calculate (i) N-X bond dissociation energies (BDE) in 4-YC6H4NH-X and (ii) N-H BDEs in 4-YC6H4NU-H, where Y = H, Me, OCH3, SMe, NH2, NMe2, SiMe3, F, Cl, CN, COOH, CF3, and NO2, X = H, CH3, F, Cl, and Li, and U = H, F, and CH(3). It was found that N-H BDEs of 4-YC6H4NH2 have a positive correlation with the substituent sigma(p+) constants. The slope (rho+) is about 3.0-4.3 kcal/mol, which is in good agreement with the experimental results. It was also found that the substituent effects on N-X BDEs of 4-YC6H4NH-X change considerably when X changes. rho(+)values for N-CH3, N-F, N-Cl, and N-Li BDEs were calculated to be 3.1-4.6, 1.3-1.9, 1.8-2.6, and 4.9-6.8 kcal/mol, respectively. The reason for the variation of substituent effects was proposed to be the ground-state effect, i.e., the interaction between the intact NH-X moiety and the parasubstituents. Finally, alpha-substitution was found to be able to significantly change the substituent effects. rho(+)values for N-H BDEs of 4-C6H4NCH3(-)H and 4-C6H4NF-H are 2.5-4.0 and 1.7-1.9 kcal/mol, respectively.
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Affiliation(s)
- Ke-Sheng Song
- Departments of Chemistry, University of Science and Technology of China, Hefei 230026, P R China
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31
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Abbott JE, Peng X, Kong W. Symmetry properties of electronically excited states of nitroaromatic compounds. J Chem Phys 2002. [DOI: 10.1063/1.1513992] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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32
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Bossa M, Morpurgo S, Stranges S. The use of ab initio and DFT calculations in the interpretation of ultraviolet photoelectron spectra: the rotational isomerism of anisole and thioanisole as a case study. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0166-1280(02)00469-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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33
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Cheng YH, Zhao X, Song KS, Liu L, Guo QX. Remote substituent effects on bond dissociation energies of para-substituted aromatic silanes. J Org Chem 2002; 67:6638-45. [PMID: 12227792 DOI: 10.1021/jo020085h] [Citation(s) in RCA: 63] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
UB3LYP/6-31G(d) and ROMP2/6-311++G(d,2p) methods were used to calculate the Si-X bond dissociation energies (BDEs) of a number of para-substituted aromatic silanes (4-Y-C(6)H(4)-SiH(2)X, where X = H, F, Cl, or Li). It was found that the substituent effect on the Si-H BDE of 4-Y-C(6)H(4)-SiH(3) was small, as the slope (rho(+)()) of the BDE- regression was only 0.09 kJ/mol. In comparison, the substituent effect on the Si-F BDE of 4-Y-C(6)H(4)-SiH(2)F was much stronger, whose rho(+ )()value was -2.34 kJ/mol. The substituent effect on the Si-Cl BDE of 4-Y-C(6)H(4)-SiH(2)Cl was also found to be strong with a rho(+)() value of -1.70 kJ/mol. However, the substituent effect on the Si-Li BDE of 4-Y-C(6)H(4)-SiH(2)Li was found to have a large and positive slope (+9.12 kJ/mol) against. The origin of the above remarkably different substituent effects on the Si-X BDEs was found to be associated with the ability of the substituent to stabilize or destabilize the starting material (4-Y-C(6)H(4)-SiH(2)X) as well as the product (4-Y-C(6)H(4)-SiH(2)* radical) of the homolysis. Therefore, the direction and magnitude of the effects of Y-substituents on the Z-X BDEs in compounds such as 4-YC(6)H(4)Z-X should have some important dependence on the polarity of the Z-X bond undergoing homolysis. This conclusion was in agreement with that from earlier studies (for example, J. Am. Chem. Soc. 1991, 113, 9363). However, it indicated that the proposal from a recent work (J. Am. Chem. Soc. 2001, 123, 5518) was unfortunately not justified.
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Affiliation(s)
- Yu-Hui Cheng
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. China
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Yao XQ, Hou XJ, Wu GS, Xu YY, Xiang HW, Jiao H, Li YW. Estimation of C−C Bond Dissociation Enthalpies of Large Aromatic Hydrocarbon Compounds Using DFT Methods. J Phys Chem A 2002. [DOI: 10.1021/jp020607x] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xiao-Qian Yao
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, People's Republic of China, 030001, and Institut für Organische Katalyseforschung an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
| | - Xin-Juan Hou
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, People's Republic of China, 030001, and Institut für Organische Katalyseforschung an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
| | - Gui-Sheng Wu
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, People's Republic of China, 030001, and Institut für Organische Katalyseforschung an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
| | - Yuan-Yuan Xu
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, People's Republic of China, 030001, and Institut für Organische Katalyseforschung an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
| | - Hong-Wei Xiang
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, People's Republic of China, 030001, and Institut für Organische Katalyseforschung an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
| | - Haijun Jiao
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, People's Republic of China, 030001, and Institut für Organische Katalyseforschung an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
| | - Yong-Wang Li
- The State Key Laboratory of Coal Conversion, Institute of Coal Chemistry, Chinese Academy of Sciences, Taiyuan, People's Republic of China, 030001, and Institut für Organische Katalyseforschung an der Universität Rostock e.V., Buchbinderstrasse 5-6, 18055 Rostock, Germany
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Photoelectron spectra of molecules. Part 12. Vinyl, allyl, and phenyl ethers and sulphides. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s0166-1280(01)00736-9] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Wright JS, Johnson ER, DiLabio GA. Predicting the activity of phenolic antioxidants: theoretical method, analysis of substituent effects, and application to major families of antioxidants. J Am Chem Soc 2001; 123:1173-83. [PMID: 11456671 DOI: 10.1021/ja002455u] [Citation(s) in RCA: 1124] [Impact Index Per Article: 48.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A procedure based on density functional theory is used for the calculation of the gas-phase bond dissociation enthalpy (BDE) and ionization potential for molecules belonging to the class of phenolic antioxidants. We show that use of locally dense basis sets (LDBS) vs full basis sets gives very similar results for monosubstituted phenols, and that the LDBS procedure gives good agreement with the change in experimental BDE values for highly substituted phenols in benzene solvent. Procedures for estimating the O--H BDE based on group additivity rules are given and tested. Several interesting classes of phenolic antioxidants are studied with these methods, including commercial antioxidants used as food additives, compounds related to Vitamin E, flavonoids in tea, aminophenols, stilbenes related to resveratrol, and sterically hindered phenols. On the basis of these results we are able to interpret relative rates for the reaction of antioxidants with free radicals, including a comparison of both H-atom-transfer and single-electron-transfer mechanisms, and conclude that in most cases H-atom transfer will be dominant.
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Affiliation(s)
- J S Wright
- Department of Chemistry and Ottawa-Carleton Chemistry Institute, Carleton University, 1125 Colonel By Drive, Ottawa, Canada K1S 5B6.
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Wright JS, Johnson ER, DiLabio GA. Predicting the Activity of Phenolic Antioxidants: Theoretical Method, Analysis of Substituent Effects, and Application to Major Families of Antioxidants. J Am Chem Soc 2001. [DOI: 10.1021/ja002455u s0002-7863] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/16/2023]
Affiliation(s)
- James S. Wright
- Contribution from the Department of Chemistry and Ottawa-Carleton Chemistry Institute, Carleton University, 1125 Colonel By Drive, Ottawa, Canada K1S 5B6
| | - Erin R. Johnson
- Contribution from the Department of Chemistry and Ottawa-Carleton Chemistry Institute, Carleton University, 1125 Colonel By Drive, Ottawa, Canada K1S 5B6
| | - Gino A. DiLabio
- Contribution from the Department of Chemistry and Ottawa-Carleton Chemistry Institute, Carleton University, 1125 Colonel By Drive, Ottawa, Canada K1S 5B6
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Wright JS, Johnson ER, DiLabio GA. Predicting the Activity of Phenolic Antioxidants: Theoretical Method, Analysis of Substituent Effects, and Application to Major Families of Antioxidants. J Am Chem Soc 2001. [DOI: 10.1021/ja002455u s0002-7863(00)02455-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- James S. Wright
- Contribution from the Department of Chemistry and Ottawa-Carleton Chemistry Institute, Carleton University, 1125 Colonel By Drive, Ottawa, Canada K1S 5B6
| | - Erin R. Johnson
- Contribution from the Department of Chemistry and Ottawa-Carleton Chemistry Institute, Carleton University, 1125 Colonel By Drive, Ottawa, Canada K1S 5B6
| | - Gino A. DiLabio
- Contribution from the Department of Chemistry and Ottawa-Carleton Chemistry Institute, Carleton University, 1125 Colonel By Drive, Ottawa, Canada K1S 5B6
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Hu Z, Boyd RJ. An assessment of theoretical methods for the study of transition metal carbonyl complexes: [Cl2Rh(CO)2]− and [Cl2Rh(CO)]− as case studies. J Chem Phys 2000. [DOI: 10.1063/1.1321294] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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40
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Theoretical calculation of ionization potentials for disubstituted benzenes: additivity vs non-additivity of substituent effects. J Org Chem 2000; 65:2195-203. [PMID: 10774046 DOI: 10.1021/jo991833e] [Citation(s) in RCA: 59] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The ionization potentials of 55 para- and 55 meta-disubstituted benzenes, consisting of all binary combinations of electron-withdrawing groups (-NO2, -CF3, -CHO, -COOH) and electron-donating groups (-Cl, -CH3, -OH, -OCH3, -NH2, and -N(CH3)2) have been calculated using density functional theory with the B3LYP functional and a 6-31G(d) basis set. Relative ionization potentials (delta IP), referred to benzene, are compared with experimental values and shown to be in good agreement. The disubstituted data were correlated with monosubstituted delta IP data and shown to require quadratic terms in order to achieve a good fit; the validity of this conclusion was possible due to the low scatter in the calculated data. A simple MO analysis gives a semiquantitative interpretation of the observed trends in substitutent effects, including a discussion of combinations of substituents for which nonadditivity should be expected.
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Dem'yanov PI, Myshakin EM, Boche G, Petrosyan VS, Alekseiko LN. Ab Initio MO and Density Functional Theory Study of Substituent Effects on Electron Attachment to Benzyl Chlorides. J Phys Chem A 1999. [DOI: 10.1021/jp993043e] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Piotr I. Dem'yanov
- Department of Chemistry, Moscow State University, Leninskie Gory, Moscow V-234, 119899 GSP-3, Russia, Fachbereich Chemie, Philipps Universität Marburg, D-35032 Marburg, Germany, Far-Eastern Technological Center, 41 Gogolya Str., Vladivostok, 690600, Russia
| | - Eugene M. Myshakin
- Department of Chemistry, Moscow State University, Leninskie Gory, Moscow V-234, 119899 GSP-3, Russia, Fachbereich Chemie, Philipps Universität Marburg, D-35032 Marburg, Germany, Far-Eastern Technological Center, 41 Gogolya Str., Vladivostok, 690600, Russia
| | - Gernot Boche
- Department of Chemistry, Moscow State University, Leninskie Gory, Moscow V-234, 119899 GSP-3, Russia, Fachbereich Chemie, Philipps Universität Marburg, D-35032 Marburg, Germany, Far-Eastern Technological Center, 41 Gogolya Str., Vladivostok, 690600, Russia
| | - Valery S. Petrosyan
- Department of Chemistry, Moscow State University, Leninskie Gory, Moscow V-234, 119899 GSP-3, Russia, Fachbereich Chemie, Philipps Universität Marburg, D-35032 Marburg, Germany, Far-Eastern Technological Center, 41 Gogolya Str., Vladivostok, 690600, Russia
| | - Leonid N. Alekseiko
- Department of Chemistry, Moscow State University, Leninskie Gory, Moscow V-234, 119899 GSP-3, Russia, Fachbereich Chemie, Philipps Universität Marburg, D-35032 Marburg, Germany, Far-Eastern Technological Center, 41 Gogolya Str., Vladivostok, 690600, Russia
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DiLabio G, Pratt D, Wright J. Theoretical calculation of gas-phase ionization potentials for mono- and polysubstituted benzenes. Chem Phys Lett 1999. [DOI: 10.1016/s0009-2614(99)00786-1] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Chatgilialoglu C, Newcomb M. Hydrogen Donor Abilities of the Group 14 Hydrides. ADVANCES IN ORGANOMETALLIC CHEMISTRY 1999. [DOI: 10.1016/s0065-3055(08)60620-6] [Citation(s) in RCA: 78] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Wiener JJ, Politzer P. Comparison of various density functional methods for computing bond dissociation energies. ACTA ACUST UNITED AC 1998. [DOI: 10.1016/s0166-1280(97)00218-2] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Ring S, Eisenhardt C, Baumgärtel H. Photoionization and dissociation of BF3·((CH3)2O)n mixed aggregates (n=1, 2) studied by mass spectrometry and ab initio calculations. Chem Phys Lett 1997. [DOI: 10.1016/s0009-2614(97)01130-5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Brinck T, Haeberlein M, Jonsson M. A Computational Analysis of Substituent Effects on the O−H Bond Dissociation Energy in Phenols: Polar Versus Radical Effects. J Am Chem Soc 1997. [DOI: 10.1021/ja962931+] [Citation(s) in RCA: 154] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Chau FT, Lee EPF, Wang DC. Theoretical Study of the Vibrational Structure of the He I Photoelectron Spectrum of H2Se. J Phys Chem A 1997. [DOI: 10.1021/jp9632293] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Foo-Tim Chau
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - Edmond Pak-Fai Lee
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
| | - De-Chao Wang
- Department of Applied Biology and Chemical Technology, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong
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Morgon NH, Giroldo T, Linnert HV, Riveros JM. Isomerization of the Molecular Ion of Allyl Bromide. ACTA ACUST UNITED AC 1996. [DOI: 10.1021/jp9605055] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nelson H. Morgon
- Instituto de Química, Universidade de São Paulo, Caixa Postal 26077, São Paulo, Brazil, CEP 05599-970
| | - Tatiana Giroldo
- Instituto de Química, Universidade de São Paulo, Caixa Postal 26077, São Paulo, Brazil, CEP 05599-970
| | - Harrald V. Linnert
- Instituto de Química, Universidade de São Paulo, Caixa Postal 26077, São Paulo, Brazil, CEP 05599-970
| | - José M. Riveros
- Instituto de Química, Universidade de São Paulo, Caixa Postal 26077, São Paulo, Brazil, CEP 05599-970
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