1
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An H, Wei Y, Zhu Q, Fu J, Xu T. Polyoxovanadate-Based Metal-Organic Frameworks with Dual Active Sites for the Synthesis of p-Benzoquinones. Inorg Chem 2024; 63:11113-11124. [PMID: 38837698 DOI: 10.1021/acs.inorgchem.4c00713] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/07/2024]
Abstract
p-Benzoquinones are important organic intermediates in the synthesis of biopharmaceuticals and fine chemicals. In this study, two crystalline 3D polyoxovanadate-based metal-organic frameworks, H[Cu(tpi)2]{Cu2V7O21}·H2O (1, tpi = C18N5H13) and [Co(Htpi)2]{V4O12} (2, Htpi = C18N5H14), were synthesized, which as heterogeneous catalysts showed excellent catalytic activities for the synthesis of p-benzoquinones. Both compounds were characterized by IR, UV-vis diffuse reflectance spectroscopy, TG, XPS, X-ray diffraction, etc. In 1, {Cu2V7} clusters are connected together by copper cations and 1D Cu-organic coordination chains to yield a 3D polyoxometalate-based metal-organic framework (POMOF); in 2, adjacent 2D bimetallic oxide layers, constructed from 1D polyoxovanadate chains and cobalt ions, are further connected by 1D Co-organic coordination chains to form a 3D POMOF. Noteworthily, in the synthesis of trimethyl-p-benzoquinone, the key intermediate of vitamin E, using 2,3,6-trimethylphenol as the model substrate, the turnover frequency values for compounds 1 and 2 can, respectively, reach 607 and 380 h-1 in 8 min. Furthermore, both compounds demonstrated excellent recyclability and structural stability, characterized by PXRD and IR. The catalytic mechanism reveals that both the homolytic radical mechanism and heterolytic oxygen atom transfer mechanism are involved.
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Affiliation(s)
- Haiyan An
- School of Chemistry, Dalian University of Technology, Dalian 116023, Liaoning, China
| | - Yuting Wei
- School of Chemistry, Dalian University of Technology, Dalian 116023, Liaoning, China
| | - Qingshan Zhu
- School of Chemistry, Dalian University of Technology, Dalian 116023, Liaoning, China
| | - Jie Fu
- School of Chemistry, Dalian University of Technology, Dalian 116023, Liaoning, China
| | - Tieqi Xu
- School of Chemistry, Dalian University of Technology, Dalian 116023, Liaoning, China
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2
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Maksimchuk N, Puiggalí-Jou J, Zalomaeva OV, Larionov KP, Evtushok VY, Soshnikov IE, Solé-Daura A, Kholdeeva OA, Poblet JM, Carbó JJ. Resolving the Mechanism for H 2O 2 Decomposition over Zr(IV)-Substituted Lindqvist Tungstate: Evidence of Singlet Oxygen Intermediacy. ACS Catal 2023; 13:10324-10339. [PMID: 37560188 PMCID: PMC10407852 DOI: 10.1021/acscatal.3c02416] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2023] [Revised: 07/04/2023] [Indexed: 08/11/2023]
Abstract
The decomposition of hydrogen peroxide (H2O2) is the main undesired side reaction in catalytic oxidation processes of industrial interest that make use of H2O2 as a terminal oxidant, such as the epoxidation of alkenes. However, the mechanism responsible for this reaction is still poorly understood, thus hindering the development of design rules to maximize the efficiency of catalytic oxidations in terms of product selectivity and oxidant utilization efficiency. Here, we thoroughly investigated the H2O2 decomposition mechanism using a Zr-monosubstituted dimeric Lindqvist tungstate, (Bu4N)6[{W5O18Zr(μ-OH)}2] ({ZrW5}2), which revealed high activity for this reaction in acetonitrile. The mechanism of the {ZrW5}2-catalyzed H2O2 degradation in the absence of an organic substrate was investigated using kinetic, spectroscopic, and computational tools. The reaction is first order in the Zr catalyst and shows saturation behavior with increasing H2O2 concentration. The apparent activation energy is 11.5 kcal·mol-1, which is significantly lower than the values previously found for Ti- and Nb-substituted Lindqvist tungstates (14.6 and 16.7 kcal·mol-1, respectively). EPR spectroscopic studies indicated the formation of superoxide radicals, while EPR with a specific singlet oxygen trap, 2,2,6,6-tetramethylpiperidone (4-oxo-TEMP), revealed the generation of 1O2. The interaction of test substrates, α-terpinene and tetramethylethylene, with H2O2 in the presence of {ZrW5}2 corroborated the formation of products typical of the oxidation processes that engage 1O2 (endoperoxide ascaridole and 2,3-dimethyl-3-butene-2-hydroperoxide, respectively). While radical scavengers tBuOH and p-benzoquinone produced no effect on the peroxide product yield, the addition of 4-oxo-TEMP significantly reduced it. After optimization of the reaction conditions, a 90% yield of ascaridole was attained. DFT calculations provided an atomistic description of the H2O2 decomposition mechanism by Zr-substituted Lindqvist tungstate catalysts. Calculations showed that the reaction proceeds through a Zr-trioxidane [Zr-η2-OO(OH)] key intermediate, whose formation is the rate-determining step. The Zr-substituted POM activates heterolytically a first H2O2 molecule to generate a Zr-peroxo species, which attacks nucleophilically to a second H2O2, causing its heterolytic O-O cleavage to yield the Zr-trioxidane complex. In agreement with spectroscopic and kinetic studies, the lowest-energy pathway involves dimeric Zr species and an inner-sphere mechanism. Still, we also found monomeric inner- and outer-sphere pathways that are close in energy and could coexist with the dimeric one. The highly reactive Zr-trioxidane intermediate can evolve heterolytically to release singlet oxygen and also decompose homolytically, producing superoxide as the predominant radical species. For H2O2 decomposition by Ti- and Nb-substituted POMs, we also propose the formation of the TM-trioxidane key intermediate, finding good agreement with the observed trends in apparent activation energies.
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Affiliation(s)
| | - Jordi Puiggalí-Jou
- Departament
de Química Física i Inorgànica, Universitat Rovira i Virgili, 43005 Tarragona, Spain
| | - Olga V. Zalomaeva
- Boreskov
Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russia
| | - Kirill P. Larionov
- Boreskov
Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russia
| | | | - Igor E. Soshnikov
- Boreskov
Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russia
| | - Albert Solé-Daura
- Departament
de Química Física i Inorgànica, Universitat Rovira i Virgili, 43005 Tarragona, Spain
| | - Oxana A. Kholdeeva
- Boreskov
Institute of Catalysis, Pr. Lavrentieva 5, Novosibirsk 630090, Russia
| | - Josep M. Poblet
- Departament
de Química Física i Inorgànica, Universitat Rovira i Virgili, 43005 Tarragona, Spain
| | - Jorge J. Carbó
- Departament
de Química Física i Inorgànica, Universitat Rovira i Virgili, 43005 Tarragona, Spain
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3
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Zheng K, Shi S, Xin H, Gao J, An Z. Selective activation of C H bond of phenol in ortho-position into C OH bond in a two-phase system. CATAL COMMUN 2021. [DOI: 10.1016/j.catcom.2020.106277] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
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4
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Photoelectrocatalytic production of hydrogen peroxide using a photo(catalytic) fuel cell. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112210] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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5
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Yang S, Xu G, Shi S, Xin H, Gao J, An Z. Selective activation of C H bond into C O bond of phenols in para-position via aerobic oxidation. CATAL COMMUN 2019. [DOI: 10.1016/j.catcom.2019.02.017] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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6
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Utepova IA, Trestsova MA, Kucheryavaya DA, Tsmokalyuk AN, Chupakhin ON, Charushin VN, Rempel AA. Mechanistic study of the direct oxidative photocatalytic aerobic C H/C H coupling of azines with heteroarenes. J Photochem Photobiol A Chem 2019. [DOI: 10.1016/j.jphotochem.2018.09.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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7
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Dalvi LT, Moreira DC, Alonso A, de Avellar IG, Hermes-Lima M. Antioxidant activity and mechanism of commercial Rama Forte persimmon fruits ( Diospyros kaki). PeerJ 2018; 6:e5223. [PMID: 30065860 PMCID: PMC6064204 DOI: 10.7717/peerj.5223] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Accepted: 06/21/2018] [Indexed: 01/18/2023] Open
Abstract
This study aimed to characterize the antioxidant properties of Rama Forte persimmon, a tannin-rich fruit variety produced in Brazil. Extracts prepared with lyophilized pulps from fruits obtained in local markets were analyzed individually to evaluate the extent of antioxidant protection and investigate the antioxidant mechanism. Iron-mediated hydroxylation of 5,5-dimethyl-1-pirrolidine-N-oxide, determined by electron paramagnetic resonance (EPR), and oxidative degradation of 2-deoxyribose (2-DR) were inhibited by fruit extracts in a dose-dependent manner. There was a considerable individual variability in inhibition of 2-DR degradation by individual fruits. Higher protection of 2-DR degradation (by the extracts) was observed in Fe(III)-citrate/ascorbate in comparison with Fe(III)-EDTA/ascorbate system; however, antioxidant effectiveness of fruit extracts was not diminished by increasing EDTA concentration by 10-fold. Other competition experiments using the 2-DR assay (varying pre-incubation time and 2-DR concentration) indicated that protection comes mainly from free radical scavenging, rather that metal chelation antioxidant activity. Persimmon extracts prevented iron-mediated lipid peroxidation in rat liver homogenates, which correlated significantly with the inhibition of 2-DR oxidation. Finally, sugar content of individual fruits correlated inversely with inhibition of 2-DR degradation, which could indicate that maturation decreases soluble antioxidant concentration or efficiency. In conclusion, lipid peroxidation, 2-DR and EPR experiments indicated that extracts from commercial fruits showed mainly radical-scavenger activity and relevant antioxidant activity.
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Affiliation(s)
- Luana T. Dalvi
- Departamento de Biologia Celular, Universidade de Brasília, Brasília, Distrito Federal, Brazil
- Departamento de Nutrição, Universidade de Brasília, Brasília, Distrito Federal, Brazil
| | - Daniel C. Moreira
- Departamento de Biologia Celular, Universidade de Brasília, Brasília, Distrito Federal, Brazil
- Área de Morfologia, Faculdade de Medicina, Universidade de Brasília, Brasília, Distrito Federal, Brazil
| | - Antonio Alonso
- Instituto de Física, Universidade Federal de Goiás, Goiânia, Goiás, Brazil
| | - Isa G.J. de Avellar
- Instituto de Química, Universidade de Brasília, Brasília, Distrito Federal, Brazil
| | - Marcelo Hermes-Lima
- Departamento de Biologia Celular, Universidade de Brasília, Brasília, Distrito Federal, Brazil
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8
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Ivanchikova ID, Skobelev IY, Maksimchuk NV, Paukshtis EA, Shashkov MV, Kholdeeva OA. Toward understanding the unusual reactivity of mesoporous niobium silicates in epoxidation of C C bonds with hydrogen peroxide. J Catal 2017. [DOI: 10.1016/j.jcat.2017.09.011] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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9
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Sankaralingam M, Lee YM, Nam W, Fukuzumi S. Selective Oxygenation of Cyclohexene by Dioxygen via an Iron(V)-Oxo Complex-Autocatalyzed Reaction. Inorg Chem 2017; 56:5096-5104. [DOI: 10.1021/acs.inorgchem.7b00220] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
| | - Yong-Min Lee
- Department of Chemistry
and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Wonwoo Nam
- Department of Chemistry
and Nano Science, Ewha Womans University, Seoul 03760, Korea
| | - Shunichi Fukuzumi
- Department of Chemistry
and Nano Science, Ewha Womans University, Seoul 03760, Korea
- Faculty of Science and Engineering, Meijo University, SENTAN, Japan Science and Technology Agency (JST), Nagoya, Aichi 468-8502, Japan
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10
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Maphoru MV, Kesavan Pillai S, Heveling J. Structure-activity relationships of carbon-supported platinum-bismuth and platinum-antimony oxidation catalysts. J Catal 2017. [DOI: 10.1016/j.jcat.2017.02.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Hu MSL, Yu J, Xin H, An Z, Sun W. Aerobic Water-based Oxidation of 2,3,6-Trimethylphenol to Trimethyl-1,4-benzoquinone over Copper(II) Nitrate Catalyst. ChemistrySelect 2017. [DOI: 10.1002/slct.201601606] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- M. S. Liangning Hu
- School of Chemistry and Chemical Engineering; Qingdao University; 308 Ningxia Road Qingdao 266071 China
| | - Jianqiang Yu
- School of Chemistry and Chemical Engineering; Qingdao University; 308 Ningxia Road Qingdao 266071 China
| | - Hongchuan Xin
- Key Laboratory of Biobased Materials; Qingdao Institute of Bioenergy and Bioprocess Technology; Chinese Academy of Sciences; 189 Songling Road Qingdao 266101 China
| | - Zengjian An
- Key Laboratory of Biobased Materials; Qingdao Institute of Bioenergy and Bioprocess Technology; Chinese Academy of Sciences; 189 Songling Road Qingdao 266101 China
| | - Wenshou Sun
- College of Environmental Science and Engineering; Qingdao University; 308 Ningxia Road Qingdao 266071 China
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12
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Shen Y, Wang F, Yang C, Zhang X. Synthesis and Characterisation of Hierarchically Porous HZSM-5 as Catalysts for the Synthesis of 2,3,5-Trimethyl-1,4-benzoquinone. Aust J Chem 2017. [DOI: 10.1071/ch16392] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Hierarchical HZSM-5 were synthesised by controlled desilication in alkaline medium and characterised by field-emission scanning electron microscopy, X-ray diffraction, transmission electron microscopy, inductively coupled plasma–atomic emission spectrometry, N2 adsorption–desorption, and Fourier transform infrared spectroscopy. The catalytic performance of HZSM-5 towards the selective oxidation of 2,3,6-trimethylphenol by H2O2 was evaluated. Recyclability tests were also carried out. The results showed that 2,3,5-trimethyl-1,4-benzoquinone was produced in high yields (i.e. 90 %), corresponding to a 2,3,6-trimethylphenol percentage of 98 %. The N2 adsorption–desorption and XRD studies suggested that mesopores with an average size of 5 nm were produced and that the structural character of HZSM-5 was preserved after desilication. Transmission electron microscopy analysis of the spent catalyst indicated good stability of the hierarchical structure. The Fourier transform infrared spectroscopy studies revealed the development of acid sites. The combined results suggested that the nature of the solvent, intrinsic acidity, and shape selectivity of the hierarchical structure of the catalyst ensured high catalytic properties.
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13
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Sankaralingam M, Lee YM, Lu X, Vardhaman AK, Nam W, Fukuzumi S. Autocatalytic dioxygen activation to produce an iron(v)-oxo complex without any reductants. Chem Commun (Camb) 2017; 53:8348-8351. [DOI: 10.1039/c7cc03742b] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An iron(v)-oxo complex with a tetraamido macrocyclic ligand, [(TAML)FeV(O)]−, was produced by reacting [(TAML)FeIII]− with dioxygen without any electron source in acetone at 298 K.
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Affiliation(s)
| | - Yong-Min Lee
- Department of Chemistry and Nano Science
- Ewha Womans University
- Seoul 03760
- Korea
| | - Xiaoyan Lu
- Department of Chemistry and Nano Science
- Ewha Womans University
- Seoul 03760
- Korea
| | | | - Wonwoo Nam
- Department of Chemistry and Nano Science
- Ewha Womans University
- Seoul 03760
- Korea
| | - Shunichi Fukuzumi
- Department of Chemistry and Nano Science
- Ewha Womans University
- Seoul 03760
- Korea
- Faculty of Science and Engineering
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14
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Yamada M, Karlin KD, Fukuzumi S. One-Step Selective Hydroxylation of Benzene to Phenol with Hydrogen Peroxide Catalysed by Copper Complexes Incorporated into Mesoporous Silica-Alumina. Chem Sci 2016; 7:2856-2863. [PMID: 27453774 PMCID: PMC4951108 DOI: 10.1039/c5sc04312c] [Citation(s) in RCA: 78] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2015] [Accepted: 01/05/2016] [Indexed: 12/20/2022] Open
Abstract
Benzene was hydroxylated with hydrogen peroxide (H2O2) in the presence of catalytic amounts of copper complexes in acetone to yield phenol at 298 K. At higher temperature, phenol was further hydroxylated with H2O2 by catalysis of copper complexes to yield p-benzoquinone. The kinetic study revealed that the rate was proportional to concentrations of benzene and H2O2, but to the square root of concentration of a copper(II) complex ([Cu(tmpa)]2+: tmpa = tris(2-pyridylmethyl)amine). The addition of a spin trapping reagent resulted in formation of a spin adduct of hydroperoxyl radical (HO2•), as observed by EPR spectroscopy, inhibiting phenol formation. HO2• produced by the reaction of [Cu(tmpa)]2+ with H2O2 acts as a chain carrier for the radical chain reactions for formation of phenol. When [Cu(tmpa)]2+ was incorporated into mesoporous silica-alumina (Al-MCM-41) by a cation exchange reaction, the selectivity to production of phenol was much enhanced by prevention of hydroxylation of phenol, which was not adsorbed to Al-MCM-41. The high durability with turnover number of 4320 for the hydroxylation of benzene to phenol with H2O2 was achieved using [Cu(tmpa)]2+ incorporated into Al-MCM-41 as an efficient and selective catalyst.
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Affiliation(s)
- Mihoko Yamada
- Department of Material and Life Science
, Graduate School of Engineering
, Osaka University
, ALCA and SENTAN
, Japan Science and Technology (JST)
,
Suita
, Osaka 565-0871
, Japan
.
| | - Kenneth D. Karlin
- Department of Chemistry
, The Johns Hopkins University
,
Baltimore
, Maryland
21218
, USA
.
| | - Shunichi Fukuzumi
- Department of Material and Life Science
, Graduate School of Engineering
, Osaka University
, ALCA and SENTAN
, Japan Science and Technology (JST)
,
Suita
, Osaka 565-0871
, Japan
.
- Department of Chemistry and Nano Science
, Ewha Womans University
,
Seoul 120-750
, Korea
- Faculty of Science and Engineering
, Meijo University
, ALCA and SENTAN
, Japan Science and Technology Agency (JST)
,
Nagoya
, Aichi 468-0073
, Japan
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15
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Recent advances in transition-metal-catalyzed selective oxidation of substituted phenols and methoxyarenes with environmentally benign oxidants. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2015.07.019] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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16
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Gligorovski S, Strekowski R, Barbati S, Vione D. Environmental Implications of Hydroxyl Radicals (•OH). Chem Rev 2015; 115:13051-92. [DOI: 10.1021/cr500310b] [Citation(s) in RCA: 737] [Impact Index Per Article: 81.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Sasho Gligorovski
- Aix-Marseille
Université, CNRS, LCE UMR 7376, 13331 Marseilles, France
| | - Rafal Strekowski
- Aix-Marseille
Université, CNRS, LCE UMR 7376, 13331 Marseilles, France
| | - Stephane Barbati
- Aix-Marseille
Université, CNRS, LCE UMR 7376, 13331 Marseilles, France
| | - Davide Vione
- Dipartimento
di Chimica, Università di Torino, Via P. Giuria 5, 10125 Torino, Italy
- Centro
Interdipartimentale NatRisk, Università di Torino, Via L. Da
Vinci 44, 10095 Grugliasco, Italy
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17
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Kholdeeva OA. Recent developments in liquid-phase selective oxidation using environmentally benign oxidants and mesoporous metal silicates. Catal Sci Technol 2014. [DOI: 10.1039/c4cy00087k] [Citation(s) in RCA: 71] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
This Perspective article surveys recent advances in the synthesis of mesoporous transition-metal-containing silicate materials and their use for the liquid-phase selective oxidation of organic compounds with environmentally friendly oxidants – molecular oxygen, hydrogen peroxide and organic hydroperoxides.
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Affiliation(s)
- Oxana A. Kholdeeva
- Boreskov Institute of Catalysis
- Novosibirsk State University
- NovosibirskNovosibirsk, Russia, Russia
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18
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Selvaraj M. Highly active and green mesostructured titanosilicate catalysts synthesized for selective synthesis of benzoquinones. Catal Sci Technol 2014. [DOI: 10.1039/c4cy00313f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Maphoru MV, Heveling J, Pillai SK. Oxidative Coupling of 1-Naphthols over Noble and Base Metal Catalysts. Chempluschem 2013; 79:99-106. [DOI: 10.1002/cplu.201300307] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2013] [Indexed: 11/10/2022]
Affiliation(s)
- Mabuatsela V Maphoru
- Department of Chemistry, Tshwane University of Technology, Private Bag X680, Pretoria 0001 (South Africa)
| | - Josef Heveling
- Department of Chemistry, Tshwane University of Technology, Private Bag X680, Pretoria 0001 (South Africa)
| | - Sreejarani K Pillai
- National Centre for Nano-Structured Materials, Council for Scientific and Industrial Research, PO Box 395, Pretoria 0001 (South Africa)
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20
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Affiliation(s)
- Alexander B Sorokin
- Institut de Recherches sur la Catalyse et l'Environnement de Lyon IRCELYON, UMR 5256, CNRS-Université Lyon 1 , 2 avenue Albert Einstein, 69626 Villeurbanne cedex, France
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21
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Kholdeeva OA. Hydrogen Peroxide Activation over TiIV: What Have We Learned from Studies on Ti-Containing Polyoxometalates? Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201201396] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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22
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Pirovano C, Guidotti M, Dal Santo V, Psaro R, Kholdeeva O, Ivanchikova I. Use of titanium-containing silica catalysts prepared by rapid and straightforward method in selective oxidations. Catal Today 2012. [DOI: 10.1016/j.cattod.2012.07.035] [Citation(s) in RCA: 10] [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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23
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Li R, Kobayashi H, Tong J, Yan X, Tang Y, Zou S, Jin J, Yi W, Fan J. Radical-involved photosynthesis of AuCN oligomers from Au nanoparticles and acetonitrile. J Am Chem Soc 2012; 134:18286-94. [PMID: 23061378 DOI: 10.1021/ja305198p] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We show here the first radical route for the direct photosynthesis of AuCN oligomers with different sizes and shapes, as evidenced by TEM observations, from an Au nanoparticle/benzaldehyde/CH(3)CN ternary system in air under UV-light irradiation. This photochemical route is green, mild, and universal, which makes itself distinguishable from the common cyanidation process. Several elementary reaction steps, including the strong C-C bond dissociation of CH(3)CN and subsequent •CN radical addition to Au, have been suggested to be critical in the formation of AuCN oligomers based on the identification of •CN radical by in situ EPR and the radical trapping technique, and other reaction products by GC-MS and (1)H NMR, and DFT calculations. The resulting solid-state AuCN oligomers exhibit unique spectroscopic characters that may be a result of the shorter Au-Au distances (namely, aurophilicity) and/or special polymer-like structures as compared with gold cyanide derivatives in the aqueous phase. The nanosized AuCN oligomers supported on mesoporous silica showed relatively good catalytic activity on the homogeneous annulation of salicylaldehyde with phenylacetylene to afford isoflavanones employing PBu(3) as the cocatalyst under moderate conditions, which also serves as evidence for the successful production of AuCN oligomers.
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Affiliation(s)
- Renhong Li
- Key Lab of Applied Chemistry of Zhejiang Province, Department of Chemistry, Zhejiang University, Hangzhou, Zhejiang Province 310027, China
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24
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Selvaraj M, Park DW, Kim I, Kawi S, Ha CS. Selective synthesis of vitamin K3 over mesoporous NbSBA-15 catalysts synthesized by an efficient hydrothermal method. Dalton Trans 2012; 41:9633-8. [DOI: 10.1039/c2dt31096a] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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25
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Abstract
It has been previously established that the aqueous oxidation of phenol by a deficiency of [IrCl(6)](2-) proceeds through the production of [IrCl(6)](3-) and phenoxyl radicals. Coupling of the phenoxyl radicals leads primarily to 4,4'-biphenol, 2,2'-biphenol, 2,4'-biphenol, and 4-phenoxyphenol. Overoxidation occurs through the further oxidation of these coupling products, leading to a rather complex mixture of final products. The rate laws for oxidation of the four coupling products by [IrCl(6)](2-) have the same form as those for the oxidation of phenol itself: -d[Ir(IV)]/dt = {(k(ArOH) + k(ArO(-))K(a)/[H(+)])/(1 + K(a)/[H(+)])}[ArOH](tot)[Ir(IV)]. Values for k(ArOH) and k(ArO(-)) have been determined for the four substrates at 25 °C and are assigned to H(2)O-PCET and electron-transfer mechanisms, respectively. Kinetic simulations of a combined mechanism that includes the rate of oxidation of phenol as well as the rates of these overoxidation steps show that the degree of overoxidation is rather limited at high pH but quite extensive at low pH. This pH-dependent overoxidation leads to a pH-dependent stoichiometric factor in the rate law for oxidation of phenol and causes some minor deviations in the rate law for oxidation of phenol. Empirically, these minor deviations can be accommodated by the introduction of a third term in the rate law that includes a "pH-dependent rate constant", but this approach masks the mechanistic origins of the effect.
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Affiliation(s)
- Na Song
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, USA
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Kholdeeva OA, Ivanchikova ID, Zalomaeva OV, Sorokin AB, Skobelev IY, Talsi EP. Mechanistic Insights into Oxidation of 2-Methyl-1-naphthol with Dioxygen: Autoxidation or a Spin-Forbidden Reaction? J Phys Chem B 2011; 115:11971-83. [DOI: 10.1021/jp2055975] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Oxana A. Kholdeeva
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Irina D. Ivanchikova
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Olga V. Zalomaeva
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Alexander B. Sorokin
- Institut de Recherches sur la Catalyse, CNRS, 2, Avenue A. Einstein, 69626 Villeurbanne Cedex, France
| | - Igor Y. Skobelev
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
| | - Eugenii P. Talsi
- Boreskov Institute of Catalysis, Lavrentiev Avenue 5, Novosibirsk, 630090, Russia
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27
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Häusser A, Trautmann M, Roduner E. Spin trapping of hydroxyl radicals on Cu/HY zeolites suspended in aqueous solution. Chem Commun (Camb) 2011; 47:6954-6. [DOI: 10.1039/c1cc11181g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Song N, Stanbury DM. Proton-coupled electron-transfer oxidation of phenols by hexachloroiridate(IV). Inorg Chem 2009; 47:11458-60. [PMID: 19006385 DOI: 10.1021/ic8015595] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
One-electron oxidation of phenol, 2,4,6-trimethylphenol, and 2,6-dimethylphenol by [IrCl(6)](2-) in aqueous solution has a simple pH dependence, indicating slow bimolecular oxidation of ArOH and faster oxidation of ArO(-). H/D kinetic isotope effects as large as 3.5 for oxidation of ArOH support concerted proton-coupled electron transfer with water as the proton acceptor.
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Affiliation(s)
- Na Song
- Department of Chemistry and Biochemistry, Auburn University, Auburn, Alabama 36849, USA
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Kholdeeva O, Ivanchikova I, Guidotti M, Pirovano C, Ravasio N, Barmatova M, Chesalov Y. Highly Selective Oxidation of Alkylphenols to Benzoquinones with Hydrogen Peroxide over Silica-Supported Titanium Catalysts: Titanium Cluster Site versus Titanium Single Site. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900109] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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30
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How to reach 100% selectivity in H2O2-based oxidation of 2,3,6-trimethylphenol to trimethyl-p-benzoquinone over Ti,Si-catalysts. Catal Today 2009. [DOI: 10.1016/j.cattod.2008.06.005] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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31
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Zalomaeva OV, Ivanchikova ID, Kholdeeva OA, Sorokin AB. Kinetics and mechanism of the oxidation of alkyl substituted phenols and naphthols with tBuOOH in the presence of supported iron phthalocyanine. NEW J CHEM 2009. [DOI: 10.1039/b821534k] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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