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Hu BC, Li MR, Li YY, Yuan XS, Hu YY, Xiao FG. Engineering a BsBDHA substrate-binding pocket entrance for the improvement in catalytic performance toward (R)-phenyl-1,2-ethanediol based on the computer-aided design. Biochem Eng J 2023. [DOI: 10.1016/j.bej.2023.108907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/29/2023]
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2
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Ćorović MZ, Belaj F, Mösch-Zanetti NC. Dioxygen Activation by a Bioinspired Tungsten(IV) Complex. Inorg Chem 2023; 62:5669-5676. [PMID: 36989414 PMCID: PMC10091480 DOI: 10.1021/acs.inorgchem.3c00228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
Abstract
An increasing number of discovered tungstoenzymes raises interest in the biomimetic chemistry of tungsten complexes in oxidation states +IV, +V, and +VI. Bioinspired (sulfur-rich) tungsten(VI) dioxido complexes are relatively prevalent in literature. Still, their energetically demanding reduction directly correlates with a small number of known tungsten(IV) oxido complexes, whose chemistry is not well explored. In this paper, a reduction of the [WO2(6-MePyS)2] (6-MePyS = 6-methylpyridine-2-thiolate) complex with PMe3 to a phosphine-stabilized tungsten(IV) oxido complex [WO(6-MePyS)2(PMe3)2] is described. This tungsten(IV) complex partially releases one PMe3 ligand in solution, creating a vacant coordination site capable of activating dioxygen to form [WO2(6-MePyS)2] and OPMe3. Therefore, [WO2(6-MePyS)2] can be used as a catalyst for the aerobic oxidation of PMe3, rendering this complex a rare example of a tungsten system utilizing dioxygen in homogeneous catalysis. Additionally, the investigation of the reactivity of the tungsten(IV) oxido complex with acetylene, substrate of a tungstoenzyme acetylene hydratase (AH), revealed the formation of the tungsten(IV) acetylene adduct. Although this adduct was previously reported as an oxidation product of the tungsten(II) acetylene carbonyl complex, here it is obtained via substitution at the sulfur-rich tungsten(IV) center, mimicking the initial step of the first shell mechanism for AH as suggested by computational studies.
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Affiliation(s)
- Miljan Z Ćorović
- Institute of Chemistry, Inorganic Chemistry, University of Graz, 8010 Graz, Austria
| | - Ferdinand Belaj
- Institute of Chemistry, Inorganic Chemistry, University of Graz, 8010 Graz, Austria
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3
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Shen HM, Ye HL, Ni JY, Wang KK, Zhou XY, She YB. Oxidation of α-C-H bonds in alkyl aromatics with O2 catalyzed by highly dispersed cobalt(II) coordinated in confined reaction channel of porphyrin-based POFs with simultaneously enhanced conversion and selectivity. Chem Eng Sci 2023. [DOI: 10.1016/j.ces.2023.118472] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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4
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Cr-Containing Rare-Earth Substituted Yttrium Iron Garnet Ferrites: Catalytic Properties in the Ethylbenzene Oxidation. Catalysts 2022. [DOI: 10.3390/catal12091033] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
A series of the Cr-containing erbium substituted yttrium iron garnet ferrites (ECYIG) was synthesized with distinct Cr amounts, herein referred to as Y3(Er0.02Fe5Cr1−x)O12, where x refers to Cr amounts from 0 to 0.05. The catalytic performance of the solids was investigated in ethylbenzene oxidation in the presence of hydrogen peroxide to assess the role of Cr and Er present in the YIG garnet lattice for fine chemistry compound production. Raman spectroscopy, HRTEM, EPR and FTIR revealed that the insertion of Er (at a fixed amount of 2%) in dodecahedral sites had a great impact on the catalytic activity of the garnets. Both Er3+ and Y3+ in the lattice simultaneously provided structural stability to the garnet structure in any harsh environment. XPS and EPR indicated that the Cr3+ ions replaced those of Fe3+ located in both octahedral and tetrahedral sites of the YIG garnets. The Cr3+ ions acted as electronic promoter to increase the oxidation rate of the Fe3+ active species responsible for activating the EB molecule. SEM-EDS demonstrated that the solids having Cr amounts lower than 4% experienced the most severe deactivation due to the Cr leaching and strong carbon species adsorption on the surface of the catalysts, which decreased their efficiency in the reaction.
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Molybdenum Modified Sol–Gel Synthesized TiO2 for the Photocatalytic Degradation of Carbamazepine under UV Irradiation. Processes (Basel) 2022. [DOI: 10.3390/pr10061113] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Pharmaceutical CEC compounds are a potential threat to man, animals, and the environment. In this study, a sol–gel-derived TiO2 (SynTiO2) was produced and subsequently sonochemically doped with a 1.5 wt% Mo to obtain the final product (Mo (1.5 wt%)/SynTiO2). The as-prepared materials were characterized for phase structure, surface, and optical properties by XRD, TEM, N2 adsorption–desorption BET isotherm at 77 K, and PSD by BJH applications, FTIR, XPS, and UV-Vis measurements in DRS mode. Estimated average crystallite size, particle size, surface area, pore-volume, pore size, and energy bandgap were 16.10 nm, 24.55 nm, 43.30 m2/g, 0.07 cm3/g, 6.23 nm, and 3.05 eV, respectively, for Mo/SynTiO2. The same structural parameters were also estimated for the unmodified SynTiO2 with respective values of 14.24 nm, 16.02 nm, 133.87 m2/g, 0.08 cm3/g, 2.32 nm, and 3.3 eV. Structurally improved (Mo (1.5 wt%)/SynTiO2) achieved ≈100% carbamazepine (CBZ) degradation after 240 min UV irradiation under natural (unmodified) pH conditions. Effects of initial pH, catalyst dosage, initial pollutant concentration, chemical scavengers, contaminant ions, hydrogen peroxide (H2O2), and humic acid (HA) were also investigated and discussed. The chemical scavenger test was used to propose involved photocatalytic degradation process mechanism of CBZ.
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Preparation and Characterization of Supported Molybdenum Doped TiO2 on α-Al2O3 Ceramic Substrate for the Photocatalytic Degradation of Ibuprofen (IBU) under UV Irradiation. Catalysts 2022. [DOI: 10.3390/catal12050562] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
TiO2-based photocatalyst materials have been widely studied for the abatement of contaminants of emerging concerns (CECs) in water sources. In this study, 1.5 wt% Mo-doped HRTiO2 was obtained by the sonochemical method. The material was analyzed and characterized for thermal, structural/textural, morphological, and optical properties using TGA-DSC, XRD, TEM, FTIR, XPS, SEM-EDS, BET (N2 adsorption-desorption measurement and BJH application method), and UV-Vis/DRS measurement. By the dip-coating technique, ~5 mg of Mo/HRTiO2 as an active topcoat was deposited on ceramic. In suspension and for photocatalyst activity performance evaluation, 1 g/L of 1.5 wt% (Mo)/HRTiO2 degraded ~98% of initial 50 mg/L IBU concentration after 80 min of 365 nm UV light irradiation and under natural (unmodified) pH conditions. Effects of initial pH condition, catalyst dosage, and initial pollutant concentration were also investigated in the photocatalyst activity performance in suspension. The photocatalyst test on the supported catalyst removed ~60% of initial 5mg/L IBU concentration, while showing an improved performance with ~90% IBU removal employing double and triple numbers of coated disk tablets. After three successive cycle test runs, XRD phase reflections of base TiO2 component of the active photocatalyst supported layer remained unchanged: An indication of surface coat stability after 360 min of exposure under 365 nm UV irradiation.
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7
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Visible light-mediated, high-efficiency oxidation of benzyl to acetophenone catalyzed by fluorescein. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2021.153570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Liu H, Zhuo Z, Zhang Y, Wei H, Zhang W, Li T, Mao Z, Wang W. Ligand coordination sphere effect of Schiff base
cis
‐dioxomolybdenum(VI) complexes in selective catalytic oxidation of alcohols. INT J CHEM KINET 2021. [DOI: 10.1002/kin.21530] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Haiwen Liu
- School of Chemistry and Material Science Ludong University Yantai China
| | - Zihan Zhuo
- School of Chemistry and Material Science Ludong University Yantai China
| | - Yan Zhang
- School of Chemistry and Material Science Ludong University Yantai China
| | - Hang Wei
- School of Chemistry and Material Science Ludong University Yantai China
| | - Wenxin Zhang
- School of Chemistry and Material Science Ludong University Yantai China
| | - Tong Li
- School of Chemistry and Material Science Ludong University Yantai China
| | - Zuodong Mao
- School of Chemistry and Material Science Ludong University Yantai China
| | - Weili Wang
- School of Chemistry and Material Science Ludong University Yantai China
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Behera PK, Choudhury P, Sahu SK, Sahu RR, Harvat AN, McNulty C, Stitgen A, Scanlon J, Kar M, Rout L. Oxygen Bridged Bimetallic CuMoO
4
Nanocatalyst for Benzylic Alcohol Oxidation; Mechanism and DFT Study. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100192] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
| | | | | | | | | | | | | | | | | | - Laxmidhar Rout
- Department of Chemistry Berhampur University Odisha 760007 India
- Adjunct Faculty Department of Chemistry IISER 760010 Berhampur Odisha India
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Li Y, Liu S, Tao S, Zhu Y, Zhao Q. Hierarchically Porous Hydrothermal Carbon Microspheres Supported N-Hydroxyphthalimide as a Green and Recyclable Catalyst for Selective Aerobic Oxidation of Alcohols. ACS OMEGA 2021; 6:6466-6473. [PMID: 33718737 PMCID: PMC7948437 DOI: 10.1021/acsomega.1c00176] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 02/18/2021] [Indexed: 06/12/2023]
Abstract
A novel metal-free, reusable, and green catalytic system comprising hydrothermal carbon microspheres (HCMSs) supporting N-hydroxyphthalimide (NHPI) was developed and employed in the aerobic oxidation of alcohol. Hierarchically porous HCMSs with good monodispersity were produced by the hydrothermal carbonization of sucrose and designed NaOH-impregnated calcination under a static air atmosphere. The meso- and macroporous pores on HCMSs make up 71% of the total pore volume. The covalent immobilization of NHPI onto HCMSs was first accomplished by grafting hyperbranched polyquaternary amine via repetitive ring-opening reactions of diglycidyl ether and subsequent amidation with 4-carboxy-NHPI. Owing to the cocatalysis of grafted quaternary ammonium salt, a designed heterogeneous catalyst has superior performance to free NHPI in the oxidation of 2-phenylethanol. The established catalytic system achieved 42% conversion and up to 96% selectivity of acetophenone at 90 °C under 1 atm O2 for 20 h and presented a versatile catalytic effect for diversified alcohols. Immobilized NHPI could be facilely recycled via simple filtration and displayed good stability for six cycles without a discernible decrease of reactivity or damage of catalyst morphology in repeated oxidation test.
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Affiliation(s)
- Yuqing Li
- College
of Pharmaceutical Science, Zhejiang Chinese
Medical University, Hangzhou 310053, China
| | - Sha Liu
- College
of Pharmaceutical Science, Zhejiang Chinese
Medical University, Hangzhou 310053, China
| | - Shan Tao
- Department
of Chemistry, Xixi Campus, Zhejiang University, Hangzhou 310028, China
| | - Yan Zhu
- Department
of Chemistry, Xixi Campus, Zhejiang University, Hangzhou 310028, China
| | - Qiming Zhao
- College
of Pharmaceutical Science, Zhejiang Chinese
Medical University, Hangzhou 310053, China
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Wang A, Zhou W, Sun Z, Zhang Z, Zhang Z, He M, Chen Q. Mn(III) active site in hydrotalcite efficiently catalyzes the oxidation of alkylarenes with molecular oxygen. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2020.111276] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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12
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Shen HM, Liu L, Qi B, Hu MY, Ye HL, She YB. Efficient and selective oxidation of secondary benzylic C H bonds to ketones with O2 catalyzed by metalloporphyrins under solvent-free and additive-free conditions. MOLECULAR CATALYSIS 2020. [DOI: 10.1016/j.mcat.2020.111102] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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13
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Aman H, Wang YH, Chuang GJ. (Diacetoxyiodo)benzene-Mediated C-H Oxidation of Benzylic Acetals. ACS OMEGA 2020; 5:918-925. [PMID: 31956846 PMCID: PMC6964519 DOI: 10.1021/acsomega.9b04009] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/25/2019] [Accepted: 12/16/2019] [Indexed: 05/11/2023]
Abstract
A useful oxidation of C-H bond of benzylic acetals has been achieved. This method avoids the use of stoichiometric metals and is compatible with the presence of both electron-donating and electron-withdrawing substituents on the aromatic ring. Oxidation was carried out by rapid microwave irradiation of benzylic acetals with PhI(OAc)2 as the oxidant. This led to the oxidation of acetals into 2-acetoxy-1,3-dioxolanes. Furthermore, this transformation protocol encompasses a wide range of valuable conversions of these useful synthons into different carboxylic acid derivatives.
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Rayati S, Khodaei E, Nafarieh P, Jafarian M, Elmi B, Wojtczak A. A manganese(iii) Schiff base complex immobilized on silica-coated magnetic nanoparticles showing enhanced electrochemical catalytic performance toward sulfide and alkene oxidation. RSC Adv 2020; 10:17026-17036. [PMID: 35496932 PMCID: PMC9053262 DOI: 10.1039/d0ra02728f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Accepted: 04/16/2020] [Indexed: 11/21/2022] Open
Abstract
A Mn–Schiff base complex supported on silica-coated iron magnetic nanoparticles was used for the electrochemical oxidation of sulfides and alkenes.
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Affiliation(s)
- Saeed Rayati
- Department of Chemistry
- K. N. Toosi University of Technology
- Tehran 15418
- Iran
| | - Elham Khodaei
- Department of Chemistry
- K. N. Toosi University of Technology
- Tehran 15418
- Iran
| | - Parinaz Nafarieh
- Department of Chemistry
- K. N. Toosi University of Technology
- Tehran 15418
- Iran
| | - Majid Jafarian
- Department of Chemistry
- K. N. Toosi University of Technology
- Tehran 15418
- Iran
| | - Bahareh Elmi
- Department of Chemistry
- K. N. Toosi University of Technology
- Tehran 15418
- Iran
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