101
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Tran TTH, Chen GL, Hoang TKA, Kuo MY, Su YO. Effect of Imidazole on the Electrochemistry of Zinc Porphyrins: An Electrochemical and Computational Study. J Phys Chem A 2017; 121:6925-6931. [PMID: 28832144 DOI: 10.1021/acs.jpca.7b05002] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
In this study, the electrochemical behavior of zinc meso-substituted porphyrins in the presence of imidazole is examined by using both cyclic voltammetry (CV) and density functional theory (DFT) methods. The results show that the first half-wave oxidation potentials (1st E1/2) of zinc porphyrins complexed with imidazole all move to the negative side, while the second ones (2nd E1/2) move to the positive side, resulting in larger half-wave oxidation potential splittings of the two oxidation states (ΔE = second E1/2 - first E1/2) comparing with the zinc porphyrins. By employing DFT calculations, we have found that both sterically controlled inter π-conjugation between porphyrin rings and meso-substituted phenyl groups and deformation of porphyrin rings do play important roles in contributing to the half-wave oxidation potentials. Imidazole exhibits strong effects on the deformation of porphyrin rings which is dominant in determining the first E1/2 while the inter π-conjugation between porphyrin rings and meso-substituted phenyl groups mainly contributes to the second E1/2. Without imidazole, the inter π-conjugation between porphyrin rings and meso-substituted phenyl groups is the only important criterion which effects both first E1/2 and second E1/2 of zinc porphyrins.
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Affiliation(s)
- Thai T H Tran
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, Nantou 545, Taiwan
| | - Guan-Ling Chen
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, Nantou 545, Taiwan
| | - Tuan K A Hoang
- Department of Chemical Engineering, University of Waterloo , 200 University Avenue, Waterloo ON N2L 3G1, Canada
| | - Ming-Yu Kuo
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, Nantou 545, Taiwan
| | - Yuhlong O Su
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, Nantou 545, Taiwan
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102
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Takayanagi T, Kimiya H, Ohyama T. Formation of artifactual DMPO-OH spin adduct in acid solutions containing nitrite ions. Free Radic Res 2017; 51:739-748. [DOI: 10.1080/10715762.2017.1369536] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Tetsuya Takayanagi
- Applied Photoelectronics Research Laboratory, Advanced Research Division, Panasonic Corporation, Moriguchi, Japan
| | - Hirokazu Kimiya
- Corporate Technology Division, Panasonic Factory Solutions Co. Ltd., Toyonaka, Japan
| | - Tatsushi Ohyama
- Applied Photoelectronics Research Laboratory, Advanced Research Division, Panasonic Corporation, Moriguchi, Japan
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103
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Berisha A, Combellas C, Kanoufi F, Decorse P, Oturan N, Médard J, Seydou M, Maurel F, Pinson J. Some Theoretical and Experimental Insights on the Mechanistic Routes Leading to the Spontaneous Grafting of Gold Surfaces by Diazonium Salts. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2017; 33:8730-8738. [PMID: 28576079 DOI: 10.1021/acs.langmuir.7b01371] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The spontaneous grafting of diazonium salts on gold may involve the carbocation obtained by heterolytic dediazonation and not necessarily the radical, as usually observed on reducing surfaces. The mechanism is addressed on the basis of DFT calculations and experiments carried out under conditions where the carbocation and the radical are produced selectively. The calculations indicate that the driving force of the reaction leading from a gold cluster, used as a gold model surface, and the carbocation to the modified cluster is higher than that of the analogous reaction starting from the radical. The experiments performed under conditions of heterolytic dediazonation show the formation of thin films on the surface of gold. The grafting of a carbocation is therefore possible, but a mechanism where the cleavage of the Ar-N bond is catalyzed by the surface of gold cannot be excluded.
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Affiliation(s)
- Avni Berisha
- Sorbonne Paris Cité, Université Paris Diderot , ITODYS, UMR 7086 CNRS, 15 rue J-A de Baïf, 75013 Paris, France
- University of Prishtina , Chemistry Department of Natural Sciences Faculty, rr. "Nëna Tereze" nr. 5, 10000 Prishtina, Kosovo
| | - Catherine Combellas
- Sorbonne Paris Cité, Université Paris Diderot , ITODYS, UMR 7086 CNRS, 15 rue J-A de Baïf, 75013 Paris, France
| | - Frédéric Kanoufi
- Sorbonne Paris Cité, Université Paris Diderot , ITODYS, UMR 7086 CNRS, 15 rue J-A de Baïf, 75013 Paris, France
| | - Philippe Decorse
- Sorbonne Paris Cité, Université Paris Diderot , ITODYS, UMR 7086 CNRS, 15 rue J-A de Baïf, 75013 Paris, France
| | - Nihal Oturan
- Université Paris-Est , Laboratoire Géomatériaux et Environnement, EA 4508, UPEM, 5 Bd Descartes, 77454 Marne-la-Vallée Cedex 2, France
| | - Jérôme Médard
- Sorbonne Paris Cité, Université Paris Diderot , ITODYS, UMR 7086 CNRS, 15 rue J-A de Baïf, 75013 Paris, France
| | - Mahamadou Seydou
- Sorbonne Paris Cité, Université Paris Diderot , ITODYS, UMR 7086 CNRS, 15 rue J-A de Baïf, 75013 Paris, France
| | - François Maurel
- Sorbonne Paris Cité, Université Paris Diderot , ITODYS, UMR 7086 CNRS, 15 rue J-A de Baïf, 75013 Paris, France
| | - Jean Pinson
- Sorbonne Paris Cité, Université Paris Diderot , ITODYS, UMR 7086 CNRS, 15 rue J-A de Baïf, 75013 Paris, France
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104
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Influence of the nature of solvent and substituents on the oxidation potential of 2,2,6,6-tetramethylpiperidine 1-oxyl derivatives. Russ Chem Bull 2017. [DOI: 10.1007/s11172-017-1792-x] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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105
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Ketkov SY, Tzeng SY, Wu PY, Markin GV, Tzeng WB. DFT-Supported Threshold Ionization Study of Chromium Biphenyl Complexes: Unveiling the Mechanisms of Substituent Influence on Redox Properties of Sandwich Compounds. Chemistry 2017; 23:13669-13675. [DOI: 10.1002/chem.201702226] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2017] [Indexed: 01/20/2023]
Affiliation(s)
- Sergey Yu. Ketkov
- G.A. Razuvaev Institute of Organometallic Chemistry RAS; Tropinin St. 49, GSP-445 Nizhny Novgorod 603950 Russian Federation
| | - Sheng-Yuan Tzeng
- Institute of Atomic and Molecular Sciences; Academia Sinica, 1 Section 4; Roosevelt Road Taipei 6017 Taiwan
| | - Pei-Ying Wu
- Institute of Atomic and Molecular Sciences; Academia Sinica, 1 Section 4; Roosevelt Road Taipei 6017 Taiwan
| | - Gennady V. Markin
- G.A. Razuvaev Institute of Organometallic Chemistry RAS; Tropinin St. 49, GSP-445 Nizhny Novgorod 603950 Russian Federation
| | - Wen-Bih Tzeng
- Institute of Atomic and Molecular Sciences; Academia Sinica, 1 Section 4; Roosevelt Road Taipei 6017 Taiwan
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106
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Effect of the ligand framework of cobalt clathrochelates on hydrogen evolution electrocatalysis: electrochemical, spectroscopic and Density Functional Theory analyses. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.03.005] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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107
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Engineering Redox Potential of Lithium Clusters for Electrode Material in Lithium-Ion Batteries. J CLUST SCI 2017. [DOI: 10.1007/s10876-017-1260-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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108
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Pierce E, Mansoorabadi SO, Can M, Reed GH, Ragsdale SW. Properties of Intermediates in the Catalytic Cycle of Oxalate Oxidoreductase and Its Suicide Inactivation by Pyruvate. Biochemistry 2017; 56:2824-2835. [PMID: 28514140 PMCID: PMC5463272 DOI: 10.1021/acs.biochem.7b00222] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Oxalate:ferredoxin oxidoreductase (OOR) is an unusual member of the thiamine pyrophosphate (TPP)-dependent 2-oxoacid:ferredoxin oxidoreductase (OFOR) family in that it catalyzes the coenzyme A (CoA)-independent conversion of oxalate into 2 equivalents of carbon dioxide. This reaction is surprising because binding of CoA to the acyl-TPP intermediate of other OFORs results in formation of a CoA ester, and in the case of pyruvate:ferredoxin oxidoreductase (PFOR), CoA binding generates the central metabolic intermediate acetyl-CoA and promotes a 105-fold acceleration of the rate of electron transfer. Here we describe kinetic, spectroscopic, and computational results to show that CoA has no effect on catalysis by OOR and describe the chemical rationale for why this cofactor is unnecessary in this enzymatic transformation. Our results demonstrate that, like PFOR, OOR binds pyruvate and catalyzes decarboxylation to form the same hydroxyethylidine-TPP (HE-TPP) intermediate and one-electron transfer to generate the HE-TPP radical. However, in OOR, this intermediate remains stranded at the active site as a covalent inhibitor. These and other results indicate that, like other OFOR family members, OOR generates an oxalate-derived adduct with TPP (oxalyl-TPP) that undergoes decarboxylation and one-electron transfer to form a radical intermediate remaining bound to TPP (dihydroxymethylidene-TPP). However, unlike in PFOR, where CoA binding drives formation of the product, in OOR, proton transfer and a conformational change in the "switch loop" alter the redox potential of the radical intermediate sufficiently to promote the transfer of an electron into the iron-sulfur cluster network, leading directly to a second decarboxylation and completing the catalytic cycle.
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Affiliation(s)
- Elizabeth Pierce
- Department of Biological Chemistry, University of Michigan , Ann Arbor, Michigan 48109-0606, United States
| | - Steven O Mansoorabadi
- Department of Chemistry and Biochemistry, Auburn University , 179 Chemistry Building, Auburn, Alabama 36849, United States
| | - Mehmet Can
- Department of Biological Chemistry, University of Michigan , Ann Arbor, Michigan 48109-0606, United States
| | - George H Reed
- Department of Biochemistry, University of Wisconsin-Madison , 440 Henry Mall, Madison, Wisconsin 53726, United States
| | - Stephen W Ragsdale
- Department of Biological Chemistry, University of Michigan , Ann Arbor, Michigan 48109-0606, United States
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109
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Wang J, Zheng W, Zheng Y. Theoretical study on homolytic B–B cleavages of diboron(4) compounds. RSC Adv 2017. [DOI: 10.1039/c7ra09006d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The B–B BDEs of diboron(4) compounds and the Pt–B and Cu–B BDEs of their corresponding complexes were investigated by SOGGA11-X method.
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Affiliation(s)
- Jiaoyang Wang
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Wenrui Zheng
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Yuanyuan Zheng
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
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110
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Borioni JL, Puiatti M, Vera DMA, Pierini AB. In search of the best DFT functional for dealing with organic anionic species. Phys Chem Chem Phys 2017; 19:9189-9198. [DOI: 10.1039/c6cp06163j] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
“And the winner is…” This work assesses the ability of different Density Functional Theory (DFT) functionals for a proper treatment of organic anionic species.
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Affiliation(s)
- José L. Borioni
- INFIQC – CONICET
- Instituto de Investigaciones en Físicoquímica de Córdoba
- Departamento de Química Orgánica
- Facultad de Ciencias Químicas
- Universidad Nacional de Córdoba
| | - Marcelo Puiatti
- INFIQC – CONICET
- Instituto de Investigaciones en Físicoquímica de Córdoba
- Departamento de Química Orgánica
- Facultad de Ciencias Químicas
- Universidad Nacional de Córdoba
| | - D. Mariano A. Vera
- QUIAMM-IMBIOTEC-Departamento de Química
- Facultad de Ciencias Exactas y Naturales
- Universidad Nacional de Mar del Plata
- Mar del Plata
- Argentina
| | - Adriana B. Pierini
- INFIQC – CONICET
- Instituto de Investigaciones en Físicoquímica de Córdoba
- Departamento de Química Orgánica
- Facultad de Ciencias Químicas
- Universidad Nacional de Córdoba
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111
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Wang J, Zheng W, Ding L, Wang Y. Computational study on C–B homolytic bond dissociation enthalpies of organoboron compounds. NEW J CHEM 2017. [DOI: 10.1039/c6nj02887j] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The theoretical study of three hybridized C–B BDEs with different substituents can provide corresponding guidance to experimental research studies.
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Affiliation(s)
- JiaoYang Wang
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - WenRui Zheng
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - LanLan Ding
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - YingXing Wang
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
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112
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La Rocca MV, Rutkowski M, Ringeissen S, Gomar J, Frantz MC, Ngom S, Adamo C. Benchmarking the DFT methodology for assessing antioxidant-related properties: quercetin and edaravone as case studies. J Mol Model 2016; 22:250. [PMID: 27686561 DOI: 10.1007/s00894-016-3118-6] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Accepted: 09/02/2016] [Indexed: 12/14/2022]
Abstract
The overall objective was to identify an accurate computational electronic method to virtually screen phenolic compounds through their antioxidant and free-radical scavenging activity. The impact of a key parameter of the density functional theory (DFT) approach was studied. Performances of the 21 most commonly used exchange-correlation functionals are thus detailed in the evaluation of the main energetic parameters related to the activities of two prototype antioxidants, namely quercetin and edaravone, is reported. These functionals have been chosen among those belonging to three different families of hybrid functionals, namely global, range separated, and double hybrids. Other computational parameters have also been considered, such as basis set and solvent effects. The selected parameters, namely bond dissociation enthalpy (BDE), ionization potential (IP), and proton dissociation enthalpy (PDE) allow a mechanistic evaluation of the antioxidant activities of free radical scavengers. Our results show that all the selected functionals provide a coherent picture of these properties, predicting the same order of BDEs and PDEs. However, with respect to the reference values, the errors found at CBS-Q3 level significantly vary with the functional. Although it is difficult to evidence a global trend from the reported data, it clearly appears that LC-ωPBE, M05-2X, and M06-2X are the most suitable approaches for the considered properties, giving the lowest cumulative mean absolute errors. These methods are therefore suggested for an accurate and fast evaluation of energetic parameters related to an antioxidant activity via free radical scavenging.
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Affiliation(s)
- Mario Vincenzo La Rocca
- Chimie ParisTech CNRS, Institut de Recherche de Chimie, PSL Research University, 75005, Paris, France.,Dipartimento di Scienza ed Alta Tecnologia, Università dell'Insubria, via Valleggio 11, 22100, Como, Italy
| | - Malvina Rutkowski
- Chimie ParisTech CNRS, Institut de Recherche de Chimie, PSL Research University, 75005, Paris, France
| | - Stéphanie Ringeissen
- L'Oréal Research and Innovation, 1 Avenue Eugène Schueller, 93601, Aulnay-sous-Bois, France
| | - Jérôme Gomar
- L'Oréal Research and Innovation, 1 Avenue Eugène Schueller, 93601, Aulnay-sous-Bois, France
| | - Marie-Céline Frantz
- L'Oréal Research and Innovation, 1 Avenue Eugène Schueller, 93601, Aulnay-sous-Bois, France
| | - Saliou Ngom
- L'Oréal Research and Innovation, 1 Avenue Eugène Schueller, 93601, Aulnay-sous-Bois, France
| | - Carlo Adamo
- Chimie ParisTech CNRS, Institut de Recherche de Chimie, PSL Research University, 75005, Paris, France. .,Institut Universitaire de France, 103 Boulevard Saint Michel, 75005, Paris, France.
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113
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Calbo J, Viruela R, Ortí E, Aragó J. Relationship between Electron Affinity and Half-Wave Reduction Potential: A Theoretical Study on Cyclic Electron-Acceptor Compounds. Chemphyschem 2016; 17:3881-3890. [DOI: 10.1002/cphc.201600778] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Joaquín Calbo
- Instituto de Ciencia Molecular; Universidad de Valencia; Catedrático José Beltrán 2 46980 Paterna Spain
| | - Rafael Viruela
- Instituto de Ciencia Molecular; Universidad de Valencia; Catedrático José Beltrán 2 46980 Paterna Spain
| | - Enrique Ortí
- Instituto de Ciencia Molecular; Universidad de Valencia; Catedrático José Beltrán 2 46980 Paterna Spain
| | - Juan Aragó
- Instituto de Ciencia Molecular; Universidad de Valencia; Catedrático José Beltrán 2 46980 Paterna Spain
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114
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Gupta M, da Silva EF, Svendsen HF. Postcombustion CO2 Capture Solvent Characterization Employing the Explicit Solvation Shell Model and Continuum Solvation Models. J Phys Chem B 2016; 120:9034-50. [DOI: 10.1021/acs.jpcb.6b04049] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mayuri Gupta
- Department
of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
| | - Eirik F. da Silva
- Department
of Process Technology, SINTEF Materials and Chemistry, Trondheim 7034, Norway
| | - Hallvard F. Svendsen
- Department
of Chemical Engineering, Norwegian University of Science and Technology, Trondheim 7491, Norway
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115
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Benmekhbi L, Louafi F, Roisnel T, Hurvois JP. Synthesis of Tetrahydroisoquinoline Alkaloids and Related Compounds through the Alkylation of Anodically Prepared α-Amino Nitriles. J Org Chem 2016; 81:6721-39. [PMID: 27410716 DOI: 10.1021/acs.joc.6b01419] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
α-Amino nitrile 2a was conveniently prepared in two individual steps from chiral hexafluorophosphate salt isoquinolinium (-)-8b including anodic cyanation as an efficient means to activate the sp(3) C1-H bond of the THIQ nucleus. The lithiation of 2a was carried out in THF at -80 °C in the presence of LDA to produce a stable α-amino carbanion which was condensed on a large variety of alkyl halides. The resulting quaternary α-amino nitriles were subjected to a stereoselective reductive decyanation in ethanol in the presence of NaBH4 as the hydride donor to yield N-Boc-1-alkyl-THIQs (+)-10a-g in up to 97:3 er's after removal of the chiral auxiliary group. Examination of the ORTEP view of THIQ (+)-1f revealed that the newly created stereogenic center had an absolute S configuration. Likewise, (-)-xylopinine was synthesized in four workup steps in an overall 63% yield from α-amino nitrile (+)-2b. In this process, crystallization of an enantioenriched mixture (90:10) of (-)-norlaudanosine with 1 equiv of (-)-N-acetyl-l-leucine afforded the leucinate salt (+)-13 (99:1 dr). Similarly, (+)-salsolidine was displaced from its (-)-DBTA salt (-)-12 in 99:1 er, which was determined by proton and carbon NMR spectroscopy in the presence of thiophosphinic acid (+)-14 as the chiral solvating agent.
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Affiliation(s)
- Lotfi Benmekhbi
- Laboratoire de Chimie des Matériaux, Faculté des Sciences Exactes, Université de Constantine 1 , route de Ain El Bey, 25000 Constantine, Algérie
| | - Fadila Louafi
- Unité de Recherche CHEMS, Faculté des Sciences Exactes, Université de Constantine 1 , route de Ain El Bey, 25000 Constantine, Algérie
| | - Thierry Roisnel
- Centre de Diffractométrie X, Institut des Sciences Chimiques de Rennes, UMR CNRS 6226, CNRS-Université de Rennes 1 , Bat. 10 B, Campus de Beaulieu, Avenue du Général Leclerc, 35042 Rennes Cedex, France
| | - Jean-Pierre Hurvois
- Institut des Sciences Chimiques de Rennes, UMR 6226, CNRS-Université de Rennes 1 , 2 Avenue Léon Bernard, 35043, Rennes Cedex, France
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116
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Tran TTH, Chang YR, Hoang TKA, Kuo MY, Su YO. Electrochemical Behavior of meso-Substituted Porphyrins: The Role of Cation Radicals to the Half-Wave Oxidation Potential Splitting. J Phys Chem A 2016; 120:5504-11. [PMID: 27379447 DOI: 10.1021/acs.jpca.6b03538] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this study, the electrochemical behavior of free base and zinc meso-substituted porphyrins is examined by cyclic voltammetry (CV) and density functional theory (DFT). The results show that the half-wave oxidation potential splitting of the two oxidation states (ΔE= second E1/2 - first E1/2) of tetraphenylporphyrin (H2TPP) and its zinc complex (ZnTPP) are higher than those of porphyrins and their zinc complexes with meso-substituted five-membered heterocylic rings. The ΔE values follow the trend of TPP > T(3'-thienyl)P > T(3'-furyl)P > T(2'-thienyl)P for both meso-porphyrins and their respective zinc complexes. By employing DFT calculations, we have found that the trend of ΔE values is consistent with that of highest spin density (HSD) distribution and HOMO-LUMO energy gaps of cationic radicals as well as the π-conjugation between central porphyrin and meso-substituted rings. Also, they exhibit the better resonance between the porphyrin ring with meso-substituted rings as moving from porphyrins and their zinc complexes with phenyl rings to five-membered heterocyclic rings. A good agreement between calculated and experimental results indicates that cationic radicals, especially their spin density distribution, do play an important role in half-wave oxidation potential splitting of meso-porphyrins and their zinc complexes.
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Affiliation(s)
- Thai T H Tran
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, Nantou Taiwan 545
| | - Yan-Ru Chang
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, Nantou Taiwan 545
| | - Tuan K A Hoang
- Department of Chemical Engineering, University of Waterloo , 200 University Avenue, Waterloo ON N2L 3G1, Canada
| | - Ming-Yu Kuo
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, Nantou Taiwan 545
| | - Yuhlong O Su
- Department of Applied Chemistry, National Chi Nan University , 1 University Road, Puli, Nantou Taiwan 545
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117
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Tazhigulov RN, Bravaya KB. Free Energies of Redox Half-Reactions from First-Principles Calculations. J Phys Chem Lett 2016; 7:2490-2495. [PMID: 27295124 DOI: 10.1021/acs.jpclett.6b00893] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Quantitative prediction of the energetics of redox half-reactions is still a challenge for modern computational chemistry. Here, we propose a simple scheme for reliable calculations of vertical ionization and attachment energies, as well as of redox potentials of solvated molecules. The approach exploits linear response approximation in the context of explicit solvent simulations with spherical boundary conditions. It is shown that both vertical ionization energies and vertical electron affinities, and, consequently redox potentials, exhibit linear dependence on the inverse radius of the solvation sphere. The explanation of the linear dependence is provided, and an extrapolation scheme is suggested. The proposed approach accounts for the specific short-range interactions within hybrid DFT and effective fragment potential approach as well as for the asymptotic system-size effects. The computed vertical ionization energies and redox potentials are in excellent agreement with the experimental values.
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Affiliation(s)
- Ruslan N Tazhigulov
- Department of Chemistry, Boston University , Boston, Massachusetts 02215, United States
| | - Ksenia B Bravaya
- Department of Chemistry, Boston University , Boston, Massachusetts 02215, United States
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118
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Affiliation(s)
- Nathan A. Romero
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - David A. Nicewicz
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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119
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Isegawa M, Neese F, Pantazis DA. Ionization Energies and Aqueous Redox Potentials of Organic Molecules: Comparison of DFT, Correlated ab Initio Theory and Pair Natural Orbital Approaches. J Chem Theory Comput 2016; 12:2272-84. [PMID: 27065224 DOI: 10.1021/acs.jctc.6b00252] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
The calculation of redox potentials involves large energetic terms arising from gas phase ionization energies, thermodynamic contributions, and solvation energies of the reduced and oxidized species. In this work we study the performance of a wide range of wave function and density functional theory methods for the prediction of ionization energies and aqueous one-electron oxidation potentials of a set of 19 organic molecules. Emphasis is placed on evaluating methods that employ the computationally efficient local pair natural orbital (LPNO) approach, as well as several implementations of coupled cluster theory and explicitly correlated F12 methods. The electronic energies are combined with implicit solvation models for the solvation energies. With the exception of MP2 and its variants, which suffer from enormous errors arising at least partially from the poor Hartree-Fock reference, ionization energies can be systematically predicted with average errors below 0.1 eV for most of the correlated wave function based methods studies here, provided basis set extrapolation is performed. LPNO methods are the most efficient way to achieve this type of accuracy. DFT methods show in general larger errors and suffer from inconsistent behavior. The only exception is the M06-2X functional which is found to be competitive with the best LPNO-based approaches for ionization energies. Importantly, the limiting factor for the calculation of accurate redox potentials is the solvation energy. The errors in the predicted solvation energies by all continuum solvation models tested in this work dominate the final computed reduction potential, resulting in average errors typically in excess of 0.3 V and hence obscuring the gains that arise from choosing a more accurate electronic structure method.
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Affiliation(s)
- Miho Isegawa
- Max Planck Institute for Chemical Energy Conversion, Stiftrasse 34-38, 45470 Mülheim and der Ruhr, Germany
| | - Frank Neese
- Max Planck Institute for Chemical Energy Conversion, Stiftrasse 34-38, 45470 Mülheim and der Ruhr, Germany
| | - Dimitrios A Pantazis
- Max Planck Institute for Chemical Energy Conversion, Stiftrasse 34-38, 45470 Mülheim and der Ruhr, Germany
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120
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Zhu L, Wang LS, Li B, Fu B, Zhang CP, Li W. Operationally simple hydrotrifluoromethylation of alkenes with sodium triflinate enabled by Ir photoredox catalysis. Chem Commun (Camb) 2016; 52:6371-4. [PMID: 26996326 DOI: 10.1039/c6cc01944g] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
We report herein a single component Ir photoredox catalyst which is capable of catalyzing the hydrotrifluoromethylation of terminal alkenes and Michael acceptors with sodium triflinate (Langlois reagent) in methanol under irradiation at room temperature. Various synthetically useful functional groups, including ester, amide, ether, aldehyde, sulfone, ketone and aryl boronate, are well tolerated in this reaction.
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Affiliation(s)
- Lei Zhu
- College of Chemistry and Materials Science, Hubei Engineering University, Hubei, 432000, China.
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121
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Yayla HG, Peng F, Mangion IK, McLaughlin M, Campeau LC, Davies IW, DiRocco DA, Knowles RR. Discovery and mechanistic study of a photocatalytic indoline dehydrogenation for the synthesis of elbasvir. Chem Sci 2016; 7:2066-2073. [PMID: 29899932 PMCID: PMC5968518 DOI: 10.1039/c5sc03350k] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2015] [Accepted: 11/27/2015] [Indexed: 12/14/2022] Open
Abstract
Elbasvir is a potent NS5A antagonist for the treatment of chronic hepatitis C. A seemingly trivial indoline oxidation en route to the target compound was complicated by epimerization of a stereogenic hemiaminal center under most standard oxidation conditions. To address this issue, a novel visible light photoredox process for indoline oxidation was developed involving an iridium photosensitizer and environmentally-benign perester oxidant. The reaction was discovered through a high-throughput experimentation campaign and the optimized process was demonstrated on 100 g scale in flow to afford a key intermediate towards the target compound. A battery of kinetic, electrochemical, and spectroscopic studies of this process indicates a radical chain mechanism of dehydrogenation involving selective HAT from the substrate by an alkoxy radicals. Notably, isotope effects were used to validate the chain mechanism when quantum yield data proved ambiguous.
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Affiliation(s)
- Hatice G Yayla
- Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , USA .
| | - Feng Peng
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Ian K Mangion
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Mark McLaughlin
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Louis-Charles Campeau
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Ian W Davies
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Daniel A DiRocco
- Department of Process Chemistry , Merck & Co., Inc. Rahway , New Jersey 07065 , USA .
| | - Robert R Knowles
- Department of Chemistry , Princeton University , Princeton , New Jersey 08544 , USA .
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122
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Sheridan MV, Lam K, Sharafi M, Schneebeli ST, Geiger WE. Anodic Methods for Covalent Attachment of Ethynylferrocenes to Electrode Surfaces: Comparison of Ethynyl Activation Processes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2016; 32:1645-1657. [PMID: 26756403 DOI: 10.1021/acs.langmuir.6b00012] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The electrochemical oxidation of ferrocenes having an H- or Li-terminated ethynyl group has been studied, especially as it relates to their covalent anchoring to carbon surfaces. The anodic oxidation of lithioethynylferrocene (1-Li) results in rapid loss of Li(+) and formation of the ethynyl-based radical FeCp(η(5)-C5H4)(C≡C), (1, Cp = η(5)-C5H5), which reacts with the electrode. Chemically modified electrodes (CMEs) were thereby produced containing strongly bonded, ethynyl-linked monolayers and electrochemically controlled multilayers. Strong attachments of ethynylferrocenes to gold and platinum surfaces were also possible. The lithiation/anodic oxidation process is a mirror analogue of the diazonium/cathodic reduction process for preparation of aryl-modified CMEs. A second method produced an ethynylferrocene-modified electrode by direct anodic oxidation of the H-terminated ethynylferrocene (1-H) at a considerably more positive potential. Both processes produced robust modified electrodes with well-defined ferrocene-based surface cyclic voltammetry waves that remained unchanged for as many as 10(4) scans. Ferrocene derivatives in which the ethynyl moiety was separated from the cyclopentadienyl ring by an ether group showed very similar behavior. DFT calculations were performed on the relevant redox states of 1-H, 1-Li, and 1, with emphasis on the ferrocenyl vs ethynyl character of their high valence orbitals. Whereas the HOMOs of both 1-H and 1-Li have some ethynyl character, the SOMOs of the corresponding monocations are strictly ferrocenium in makeup. Predominant ethynyl character returns to the highest valence orbitals after loss of Li(+) from [1-Li](+) or loss of H(+) from [1-H](2+). These anodic processes hold promise for the controlled chemical modification of carbon and other electrode surfaces by a variety of ethynyl or alkynyl-linked organic and metal-containing systems.
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Affiliation(s)
- Matthew V Sheridan
- Department of Chemistry, University of Vermont , Burlington, Vermont 05405, United States
| | - Kevin Lam
- Department of Chemistry, University of Vermont , Burlington, Vermont 05405, United States
| | - Mona Sharafi
- Department of Chemistry, University of Vermont , Burlington, Vermont 05405, United States
| | - Severin T Schneebeli
- Department of Chemistry, University of Vermont , Burlington, Vermont 05405, United States
| | - William E Geiger
- Department of Chemistry, University of Vermont , Burlington, Vermont 05405, United States
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123
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Mechanism and enantioselectivity in α-alkylation of carbonyl compounds via photoredox organocatalysis: A DFT study. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2016.01.005] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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124
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Anthranilic acid as a secondary antioxidant: Implications to the inhibition of OH production and the associated oxidative stress. COMPUT THEOR CHEM 2016. [DOI: 10.1016/j.comptc.2015.09.025] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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125
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Ketkov SY, Markin GV, Tzeng SY, Tzeng WB. Fine Substituent Effects in Sandwich Complexes: A Threshold Ionization Study of Monosubstituted Chromium Bisarene Compounds. Chemistry 2016; 22:4690-4. [DOI: 10.1002/chem.201505039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Sergey Yu. Ketkov
- G. A. Razuvaev Institute of Organometallic Chemistry; RAS; Tropinin St. 49, GSP-445 Nizhny Novgorod 603950 Russian Federation
| | - Gennady V. Markin
- G. A. Razuvaev Institute of Organometallic Chemistry; RAS; Tropinin St. 49, GSP-445 Nizhny Novgorod 603950 Russian Federation
| | - Sheng Y. Tzeng
- Institute of Atomic and Molecular Sciences, Academia Sinica; 1 Section 4, Roosevelt Road Taipei 6017 Taiwan
| | - Wen B. Tzeng
- Institute of Atomic and Molecular Sciences, Academia Sinica; 1 Section 4, Roosevelt Road Taipei 6017 Taiwan
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126
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Bím D, Rulíšek L, Srnec M. Accurate Prediction of One-Electron Reduction Potentials in Aqueous Solution by Variable-Temperature H-Atom Addition/Abstraction Methodology. J Phys Chem Lett 2016; 7:7-13. [PMID: 26647144 DOI: 10.1021/acs.jpclett.5b02452] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
A robust and efficient theoretical approach for calculation of the reduction potentials of charged species in aqueous solution is presented. Within this approach, the reduction potential of a charged complex (with a charge |n| ≥ 2) is probed by means of the reduction potential of its neutralized (protonated/deprotonated) cognate, employing one or several H-atom addition/abstraction thermodynamic cycles. This includes a separation of one-electron reduction from protonation/deprotonation through the temperature dependence. The accuracy of the method has been assessed for the set of 15 transition-metal complexes that are considered as highly challenging systems for computational electrochemistry. Unlike the standard computational protocol(s), the presented approach yields results that are in excellent agreement with experimental electrochemical data. Last but not least, the applicability and limitations of the approach are thoroughly discussed.
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Affiliation(s)
- Daniel Bím
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic , Flemingovo náměstí 2, 166 10 Praha 6, Czech Republic
| | - Lubomír Rulíšek
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic , Flemingovo náměstí 2, 166 10 Praha 6, Czech Republic
| | - Martin Srnec
- J. Heyrovský Institute of Physical Chemistry, Academy of Sciences of the Czech Republic , Dolejškova 3, 182 20 Praha 8, Czech Republic
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127
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Zheng W, Ding L, Wang J, Wang Y. Computational study on alkenyl/aryl C(sp2)–O homolytic cleavage of carboxylates and carbamates. RSC Adv 2016. [DOI: 10.1039/c5ra27859g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The alkenyl/aryl C(sp2)–O cleavage and the substituent effect in both carboxylates/carbamates and corresponding Ni complexes were investigated in detail by wB97 method.
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Affiliation(s)
- Wenrui Zheng
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Lanlan Ding
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Jiaoyang Wang
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Yingxing Wang
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
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128
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Galano A. Computational-aided design of melatonin analogues with outstanding multifunctional antioxidant capacity. RSC Adv 2016. [DOI: 10.1039/c6ra00549g] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
The IIcD melatonin-analogue was identified as the most promising multifunctional antioxidant from a set of 19, and better for that purpose than the parent molecule and Trolox.
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Affiliation(s)
- Annia Galano
- Departamento de Química
- Universidad Autónoma Metropolitana-Iztapalapa
- México D. F
- Mexico
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129
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Hickey DP, Schiedler DA, Matanovic I, Doan PV, Atanassov P, Minteer SD, Sigman MS. Predicting Electrocatalytic Properties: Modeling Structure-Activity Relationships of Nitroxyl Radicals. J Am Chem Soc 2015; 137:16179-86. [PMID: 26635089 DOI: 10.1021/jacs.5b11252] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Stable nitroxyl radical-containing compounds, such as 2,2,6,6-tetramethylpiperidine-N-oxyl (TEMPO) and its derivatives, are capable of electrocatalytically oxidizing a wide range of alcohols under mild and environmentally friendly conditions. Herein, we examine the structure-function relationships that determine the catalytic activity of a diverse range of water-soluble nitroxyl radical compounds. A strong correlation is described between the difference in the electrochemical oxidation potentials of a compound and its electrocatalytic activity. Additionally, we construct a simple computational model that is able to accurately predict the electrochemical potential and catalytic activity of a wide range of nitroxyl radical derivatives.
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Affiliation(s)
- David P Hickey
- Department of Chemistry, University of Utah , Salt Lake City, Utah 84112, United States
| | - David A Schiedler
- Department of Chemistry, University of Utah , Salt Lake City, Utah 84112, United States
| | - Ivana Matanovic
- Department of Chemical & Biological Engineering, University of New Mexico , Albuquerque, New Mexico 87131, United States.,Theoretical Division, Los Alamos National Laboratory , Los Alamos, New Mexico 87545, United States
| | - Phuong Vy Doan
- Department of Chemistry, University of Utah , Salt Lake City, Utah 84112, United States
| | - Plamen Atanassov
- Department of Chemical & Biological Engineering, University of New Mexico , Albuquerque, New Mexico 87131, United States
| | - Shelley D Minteer
- Department of Chemistry, University of Utah , Salt Lake City, Utah 84112, United States
| | - Matthew S Sigman
- Department of Chemistry, University of Utah , Salt Lake City, Utah 84112, United States
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130
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Berisha A, Chehimi M, Pinson J, Podvorica F. Electrode Surface Modification Using Diazonium Salts. ELECTROANALYTICAL CHEMISTRY: A SERIES OF ADVANCES 2015. [DOI: 10.1201/b19196-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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131
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Lang SB, O'Nele KM, Douglas JT, Tunge JA. Dual Catalytic Decarboxylative Allylations of α-Amino Acids and Their Divergent Mechanisms. Chemistry 2015; 21:18589-93. [PMID: 26526115 DOI: 10.1002/chem.201503644] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/11/2015] [Indexed: 02/04/2023]
Abstract
The room temperature radical decarboxylative allylation of N-protected α-amino acids and esters has been accomplished via a combination of palladium and photoredox catalysis to provide homoallylic amines. Mechanistic investigations revealed that the stability of the α-amino radical, which is formed by decarboxylation, dictates the predominant reaction pathway between competing mechanisms.
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Affiliation(s)
- Simon B Lang
- Department of Chemistry, The University of Kansas, 2010 Malott Hall, 1251 Wescoe Hall Drive, Lawrence KS 66045 (USA)
| | - Kathryn M O'Nele
- Department of Chemistry, The University of Kansas, 2010 Malott Hall, 1251 Wescoe Hall Drive, Lawrence KS 66045 (USA)
| | - Justin T Douglas
- Department of Chemistry, The University of Kansas, 2010 Malott Hall, 1251 Wescoe Hall Drive, Lawrence KS 66045 (USA)
| | - Jon A Tunge
- Department of Chemistry, The University of Kansas, 2010 Malott Hall, 1251 Wescoe Hall Drive, Lawrence KS 66045 (USA).
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132
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Wang GZ, Shang R, Cheng WM, Fu Y. Decarboxylative 1,4-Addition of α-Oxocarboxylic Acids with Michael Acceptors Enabled by Photoredox Catalysis. Org Lett 2015; 17:4830-3. [DOI: 10.1021/acs.orglett.5b02392] [Citation(s) in RCA: 130] [Impact Index Per Article: 14.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Guang-Zu Wang
- ChEM, CAS Key Laboratory
of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass
Clean Energy, Department of Chemistry, University of Science and Technology of China, Hefei 230026, P.R. China
| | - Rui Shang
- ChEM, CAS Key Laboratory
of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass
Clean Energy, Department of Chemistry, University of Science and Technology of China, Hefei 230026, P.R. China
| | - Wan-Min Cheng
- ChEM, CAS Key Laboratory
of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass
Clean Energy, Department of Chemistry, University of Science and Technology of China, Hefei 230026, P.R. China
| | - Yao Fu
- ChEM, CAS Key Laboratory
of Urban Pollutant Conversion, Anhui Province Key Laboratory of Biomass
Clean Energy, Department of Chemistry, University of Science and Technology of China, Hefei 230026, P.R. China
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133
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Borodin O, Olguin M, Spear CE, Leiter KW, Knap J. Towards high throughput screening of electrochemical stability of battery electrolytes. NANOTECHNOLOGY 2015; 26:354003. [PMID: 26266636 DOI: 10.1088/0957-4484/26/35/354003] [Citation(s) in RCA: 78] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
High throughput screening of solvents and additives with potential applications in lithium batteries is reported. The initial test set is limited to carbonate and phosphate-based compounds and focused on their electrochemical properties. Solvent stability towards first and second reduction and oxidation is reported from density functional theory (DFT) calculations performed on isolated solvents surrounded by implicit solvent. The reorganization energy is estimated from the difference between vertical and adiabatic redox energies and found to be especially important for the accurate prediction of reduction stability. A majority of tested compounds had the second reduction potential higher than the first reduction potential indicating that the second reduction reaction might play an important role in the passivation layer formation. Similarly, the second oxidation potential was smaller for a significant subset of tested molecules than the first oxidation potential. A number of potential sources of errors introduced during screening of the electrolyte electrochemical properties were examined. The formation of lithium fluoride during reduction of semifluorinated solvents such as fluoroethylene carbonate and the H-transfer during oxidation of solvents were found to shift the electrochemical potential by 1.5-2 V and could shrink the electrochemical stability window by as much as 3.5 V when such reactions are included in the screening procedure. The initial oxidation reaction of ethylene carbonate and dimethyl carbonate at the surface of the completely de-lithiated LiNi0.5Mn1.5O4 high voltage spinel cathode was examined using DFT. Depending on the molecular orientation at the cathode surface, a carbonate molecule either exhibited deprotonation or was found bound to the transition metal via its carbonyl oxygen.
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Affiliation(s)
- Oleg Borodin
- Electro-Chemistry Branch, RDRL-SED-C, Powder Mill Rd. 2800, US Army Research Laboratory, Adelphi, MD, 20783-1138, USA
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134
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Umadevi V, Mano Priya A, Senthilkumar L. DFT study on the tautomerism of organic linker 1H-imidazole-4,5-tetrazole (HIT). COMPUT THEOR CHEM 2015. [DOI: 10.1016/j.comptc.2015.06.022] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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135
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Demissie TB, Ruud K, Hansen JH. DFT as a Powerful Predictive Tool in Photoredox Catalysis: Redox Potentials and Mechanistic Analysis. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00582] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Taye B. Demissie
- Centre for Theoretical and Computational
Chemistry, ‡Department of Chemistry, UiT − The Arctic University of Norway, 9037 Tromsø, Norway
| | - Kenneth Ruud
- Centre for Theoretical and Computational
Chemistry, ‡Department of Chemistry, UiT − The Arctic University of Norway, 9037 Tromsø, Norway
| | - Jørn H. Hansen
- Centre for Theoretical and Computational
Chemistry, ‡Department of Chemistry, UiT − The Arctic University of Norway, 9037 Tromsø, Norway
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136
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Bin Z, Duan L, Qiu Y. Air stable organic salt as an n-type dopant for efficient and stable organic light-emitting diodes. ACS APPLIED MATERIALS & INTERFACES 2015; 7:6444-6450. [PMID: 25768295 DOI: 10.1021/acsami.5b00839] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Air-stable and low-temperature-evaporable n-type dopants are highly desired for efficient and stable organic light-emitting diodes (OLEDs). In this work, 2-(2-Methoxyphenyl)-1,3-dimethyl-1H-benzoimidazol-3-ium iodide (o-MeO-DMBI-I), a thermally decomposable precursor of organic radical o-MeO-DMBI, has been employed as a novel n-type dopant in OLEDs, because of its air stability, low decomposition temperature, and lack of atom diffusion. The n-type electrical doping is evidenced by the rapid increase in current density of electron-only devices and the large improvement in conductivity, originated from increased electron concentration in electron-transport layer (ETL) and reduced electron injection barrier. A highly efficient and stable OLED is created using o-MeO-DMBI as an n-type dopant in Bphen. Compared with the control device with its high-temperature-evaporable n-type dopant cesium carbonate (Cs2CO3), o-MeO-DMBI-doped device showed an incredible boom in current efficiency from 28.6 to 42.2 cd/A. Moreover, the lifetime (T(70%)) of o-MeO-DMBI-doped device is 45 h, more than 20 times longer than that of the Cs2CO3-doped device (2 h). The enhanced efficiency and stability are attributed to the improved balance of holes and electrons in the emissive layer, and the eliminated atom diffusion of cesium.
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137
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Ding L, Zheng W, Wang Y. Homolytic C–O Cleavage in Phosphates and Sulfonates. J Phys Chem A 2015; 119:3488-99. [DOI: 10.1021/acs.jpca.5b00569] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lanlan Ding
- College of Chemistry and
Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
| | - Wenrui Zheng
- College of Chemistry and
Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
| | - Yingxing Wang
- College of Chemistry and
Chemical Engineering, Shanghai University of Engineering Science, Shanghai 201620, China
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138
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Iwayama M, Kurniawan I, Kawaguchi K, Saito H, Nagao H. A hybrid-type approach with MD and DFT calculations for evaluation of redox potential of molecules. MOLECULAR SIMULATION 2015. [DOI: 10.1080/08927022.2015.1012641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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139
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Kögel JF, Linder T, Schröder FG, Sundermeyer J, Goll SK, Himmel D, Krossing I, Kütt K, Saame J, Leito I. Fluoro- and Perfluoralkylsulfonylpentafluoroanilides: Synthesis and Characterization of NH Acids for Weakly Coordinating Anions and Their Gas-Phase and Solution Acidities. Chemistry 2015; 21:5769-82. [DOI: 10.1002/chem.201405391] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2014] [Indexed: 11/07/2022]
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140
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Yoshioka E, Kohtani S, Tanaka E, Hata Y, Miyabe H. Carbon radical addition–cyclization reaction induced by ruthenium-photocatalyst under visible light irradiation. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.12.068] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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141
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Cheng GJ, Zhang X, Chung LW, Xu L, Wu YD. Computational organic chemistry: bridging theory and experiment in establishing the mechanisms of chemical reactions. J Am Chem Soc 2015; 137:1706-25. [PMID: 25568962 DOI: 10.1021/ja5112749] [Citation(s) in RCA: 234] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Understanding the mechanisms of chemical reactions, especially catalysis, has been an important and active area of computational organic chemistry, and close collaborations between experimentalists and theorists represent a growing trend. This Perspective provides examples of such productive collaborations. The understanding of various reaction mechanisms and the insight gained from these studies are emphasized. The applications of various experimental techniques in elucidation of reaction details as well as the development of various computational techniques to meet the demand of emerging synthetic methods, e.g., C-H activation, organocatalysis, and single electron transfer, are presented along with some conventional developments of mechanistic aspects. Examples of applications are selected to demonstrate the advantages and limitations of these techniques. Some challenges in the mechanistic studies and predictions of reactions are also analyzed.
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Affiliation(s)
- Gui-Juan Cheng
- Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen 518055, China
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142
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Wang YX, Zheng WR. A comparison of the C‒H bond dissociation enthalpies of sulfur-containing fused heterocyclic compounds to the C‒H bond dissociation enthalpies in other heterocycles. J Sulphur Chem 2015. [DOI: 10.1080/17415993.2014.996222] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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143
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Ding L, Zheng W, Wang Y. Theoretical study on homolytic C(sp2)–O cleavage in ethers and phenols. NEW J CHEM 2015. [DOI: 10.1039/c5nj01354b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The C(sp2)–O BDEs and the substituent effect of ethers/phenols were investigated in detail by the wB97 method.
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Affiliation(s)
- Lanlan Ding
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Wenrui Zheng
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
| | - Yingxing Wang
- College of Chemistry and Chemical Engineering
- Shanghai University of Engineering Science
- Shanghai 201620
- China
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144
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Ho J. Are thermodynamic cycles necessary for continuum solvent calculation of pKas and reduction potentials? Phys Chem Chem Phys 2014; 17:2859-68. [PMID: 25503399 DOI: 10.1039/c4cp04538f] [Citation(s) in RCA: 141] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Continuum solvent calculations of pKas and reduction potentials usually entail the use of a thermodynamic cycle to express the reaction free energy in terms of gas phase energies and free energies of solvation. In this work, we present a systematic study comparing the solution phase free energy changes obtained in this manner with those directly computed within the SMD solvation model against a large test set of 117 pKas and 42 reduction potentials in water and DMSO. The inclusion of vibrational contributions in the free energy of solvation has a negligible impact on the accuracy of thermodynamic cycle predictions of pKas and reduction potentials. Additionally, when gas phase energies in the thermodynamic cycle are computed at more accurate levels of theory, very similar results (mean unsigned difference of 0.5 kcal mol(-1)) can be achieved when the high-level computations (MP2/GTMP2Large and G3(MP2)-RAD(+)) are directly carried out within the continuum model. Increasing the accuracy of the electronic structure theory may or may not improve the agreement with experiment suggesting that the error is largely in the solvation model. For amino acids where their gas and solution phase species exist as different tautomers, the direct approach provided a significant improvement in calculated pKas. These results demonstrate that direct calculation of solution phase pKas and reduction potentials within the SMD model provides a general and reliable approximation to corresponding thermodynamic cycle based protocols, and is recommended for systems where solvation induced changes in geometry are significant. Further studies are necessary to ascertain whether the results are generalisable to other continuum solvation models.
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Affiliation(s)
- Junming Ho
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT 06520, USA.
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145
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Majek M, Jacobi von Wangelin A. Metallfreie Carbonylierung durch Photoredoxkatalyse. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201408516] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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146
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Majek M, Jacobi von Wangelin A. Metal-Free Carbonylations by Photoredox Catalysis. Angew Chem Int Ed Engl 2014; 54:2270-4. [DOI: 10.1002/anie.201408516] [Citation(s) in RCA: 143] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2014] [Revised: 09/23/2014] [Indexed: 11/08/2022]
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147
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The redox potential of the phenyl radical/anion couple and the effect thereon of the lithium cation: A computational study. Electrochem commun 2014. [DOI: 10.1016/j.elecom.2014.08.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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148
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Substituent effects on the redox potentials of dihydroxybenzenes: theoretical and experimental study. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.10.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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149
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150
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Luo P, Feinberg EC, Guirado G, Farid S, Dinnocenzo JP. Accurate Oxidation Potentials of 40 Benzene and Biphenyl Derivatives with Heteroatom Substituents. J Org Chem 2014; 79:9297-304. [DOI: 10.1021/jo501761c] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Pu Luo
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Elizabeth C. Feinberg
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Gonzalo Guirado
- Departament de Química (Quimica-Fisica), Universitat Autònoma de Barcelona, Edifi C, 08193 Bellaterra, Barcelona, Spain
| | - Samir Farid
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
| | - Joseph P. Dinnocenzo
- Department of Chemistry, University of Rochester, Rochester, New York 14627, United States
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