1
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Sanderson HJ, Kociok-Köhn G, McMullin CL, Hintermair U. Twinned versus linked organometallics - bimetallic "half-baguette" pentalenide complexes of Rh(I). Dalton Trans 2024; 53:5881-5899. [PMID: 38446046 DOI: 10.1039/d3dt04325h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
The application of Mg[Ph4Pn] and Li·K[Ph4Pn] in transmetalation reactions to a range of Rh(I) precursors led to the formation of "half-baguette" anti-[RhI(L)n]2[μ:η5:η5Ph4Pn] (L = 1,5-cyclooctadiene, norbornadiene, ethylene; n = 1, 2) and syn-[RhI(CO)2]2[μ:η5:η5Ph4Pn] complexes as well as the related iridium complex anti-[IrI(COD)]2[μ:η5:η5Ph4Pn]. With CO exclusive syn metalation was obtained even when using mono-nuclear Rh(I) precursors, indicating an electronic preference for syn metalation. DFT analysis showed this to be the result of π overlap between the adjacent M(CO)2 units which overcompensates for dz2 repulsion of the metals, an effect which can be overridden by steric clash of the auxiliary ligands to yield anti-configuration as seen in the larger olefin complexes. syn-[RhI(CO)2]2[μ:η5:η5Ph4Pn] is a rare example of a twinned organometallic where the two metals are held flexibly in close proximity, but the two d8 Rh(I) centres did not show signs of M-M bonding interactions or exhibit Lewis basic behaviour as in some related mono-nuclear Cp complexes due to the acceptor properties of the ligands. The ligand substitution chemistry of syn-[RhI(CO)2]2[μ:η5:η5Ph4Pn] was investigated with a series of electronically and sterically diverse donor ligands (P(OPh)3, P(OMe)3, PPh3, PMe3, dppe) yielding new mono- and bis-substituted complexes, with E-syn-[RhI(CO)(P{OR})3]2[μ:η5:η5Ph4Pn] (R = Me, Ph) characterised by XRD.
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Affiliation(s)
- Hugh J Sanderson
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
| | - Gabriele Kociok-Köhn
- Material and Chemical Characterisation Facility, University of Bath, Claverton Down, Bath BA2 7AY, UK
| | - Claire L McMullin
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
| | - Ulrich Hintermair
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
- Institute for Sustainability, University of Bath, Claverton Down, Bath, BA2 7AY, UK
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2
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Shimauchi D, Yatabe T, Ikesue Y, Kajiwara Y, Koide T, Ando T, Yoon KS, Nakai H, Ogo S. Storing electrons from H 2 for transfer to CO 2, all at room temperature. Chem Commun (Camb) 2023. [PMID: 38018815 DOI: 10.1039/d3cc05285k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Abstract
We present an Ir complex that extracts electrons from H2 at room temperature and stores them as a H2-derived energy carrier (H2EC) at room temperature. Furthermore, we demonstrate that this complex reduces CO2 to a metal-CO22- species at room temperature, and present the first electrospray ionisation mass spectrum for this compound.
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Affiliation(s)
- Daiki Shimauchi
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
- International Institute for Carbon-Neutral Energy Research (WPI Academy I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Takeshi Yatabe
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
- International Institute for Carbon-Neutral Energy Research (WPI Academy I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Center for Small Molecule Energy, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yuka Ikesue
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
- International Institute for Carbon-Neutral Energy Research (WPI Academy I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Yuu Kajiwara
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
- International Institute for Carbon-Neutral Energy Research (WPI Academy I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Taro Koide
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
- International Institute for Carbon-Neutral Energy Research (WPI Academy I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Tatsuya Ando
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
- International Institute for Carbon-Neutral Energy Research (WPI Academy I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Center for Small Molecule Energy, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Ki-Seok Yoon
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
- International Institute for Carbon-Neutral Energy Research (WPI Academy I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Center for Small Molecule Energy, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
| | - Hidetaka Nakai
- Department of Energy and Materials, Faculty of Science and Engineering, Kindai University, 3-4-1 Kowakae, Higashi-Osaka, Osaka 577-8502, Japan
| | - Seiji Ogo
- Department of Chemistry and Biochemistry, Graduate School of Engineering, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan.
- International Institute for Carbon-Neutral Energy Research (WPI Academy I2CNER), Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
- Center for Small Molecule Energy, Kyushu University, 744 Moto-oka, Nishi-ku, Fukuoka 819-0395, Japan
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3
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Balduf T, Blakemore JD, Caricato M. Computational Insights into the Influence of Ligands on Hydrogen Generation with [Cp*Rh] Hydrides. J Phys Chem A 2023. [PMID: 37436832 DOI: 10.1021/acs.jpca.3c02550] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/14/2023]
Abstract
This work reports a computational investigation of the effect of ancillary ligands on the activity of an Rh catalyst for hydrogen evolution based on the [Cp*Rh] motif (Cp* = η5-pentamethylcyclopentadienyl). Specifically, we investigate why a bipyridyl (bpy) ligand leads to H2 generation but diphenylphosphino-based (dpp) ligands do not. We compare the full ligands to simplified models and systematically vary structural features to ascertain their effect on the reaction energy of each catalytic step. The calculations based on density functional theory show that the main effect on reactivity is the choice of linker atom, followed by its coordination. In particular, P stabilizes the intermediate Rh-hydride species by donating electron density to the Rh, thus inhibiting the reaction toward H2 generation. Conversely, N, a more electron-withdrawing center, favors H2 generation at the price of destabilizing the hydride intermediate, which cannot be isolated experimentally and makes determining the mechanism of this reaction more difficult. We also find that the steric effects of bulky substituents on the main ligand scaffold can lead to large effects on the reactivity, which may be challenging to fine-tune. On the other hand, structural features like the bite angle of the bidentate ligand have a much smaller impact on reactivity. Therefore, we propose that the choice of linker atom is key for the catalytic activity of this species, which can be further fine-tuned by a proper choice of electron-directing groups on the ligand scaffold.
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Affiliation(s)
- Ty Balduf
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - James D Blakemore
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Marco Caricato
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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4
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Henke W, Peng Y, Meier A, Fujita E, Grills D, Polyansky D, Blakemore J. Mechanistic roles of metal- and ligand-protonated species in hydrogen evolution with [Cp*Rh] complexes. Proc Natl Acad Sci U S A 2023; 120:e2217189120. [PMID: 37186841 PMCID: PMC10214172 DOI: 10.1073/pnas.2217189120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2022] [Accepted: 02/17/2023] [Indexed: 05/17/2023] Open
Abstract
Protonation reactions involving organometallic complexes are ubiquitous in redox chemistry and often result in the generation of reactive metal hydrides. However, some organometallic species supported by η5-pentamethylcyclopentadienyl (Cp*) ligands have recently been shown to undergo ligand-centered protonation by direct proton transfer from acids or tautomerization of metal hydrides, resulting in the generation of complexes bearing the uncommon η4-pentamethylcyclopentadiene (Cp*H) ligand. Here, time-resolved pulse radiolysis (PR) and stopped-flow spectroscopic studies have been applied to examine the kinetics and atomistic details involved in the elementary electron- and proton-transfer steps leading to complexes ligated by Cp*H, using Cp*Rh(bpy) as a molecular model (where bpy is 2,2'-bipyridyl). Stopped-flow measurements coupled with infrared and UV-visible detection reveal that the sole product of initial protonation of Cp*Rh(bpy) is [Cp*Rh(H)(bpy)]+, an elusive hydride complex that has been spectroscopically and kinetically characterized here. Tautomerization of the hydride leads to the clean formation of [(Cp*H)Rh(bpy)]+. Variable-temperature and isotopic labeling experiments further confirm this assignment, providing experimental activation parameters and mechanistic insight into metal-mediated hydride-to-proton tautomerism. Spectroscopic monitoring of the second proton transfer event reveals that both the hydride and related Cp*H complex can be involved in further reactivity, showing that [(Cp*H)Rh] is not necessarily an off-cycle intermediate, but, instead, depending on the strength of the acid used to drive catalysis, an active participant in hydrogen evolution. Identification of the mechanistic roles of the protonated intermediates in the catalysis studied here could inform design of optimized catalytic systems supported by noninnocent cyclopentadienyl-type ligands.
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Affiliation(s)
- Wade C. Henke
- Department of Chemistry, University of Kansas, Lawrence, KS66045
| | - Yun Peng
- Department of Chemistry, University of Kansas, Lawrence, KS66045
| | - Alex A. Meier
- Department of Chemistry, University of Kansas, Lawrence, KS66045
| | - Etsuko Fujita
- Chemistry Division, Brookhaven National Laboratory, Upton, NY11973-5000
| | - David C. Grills
- Chemistry Division, Brookhaven National Laboratory, Upton, NY11973-5000
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5
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Han B, Ren C, Wu L. Titanium-Catalyzed Hydrodehalogenation of Alkyl Halides. Organometallics 2023. [DOI: 10.1021/acs.organomet.2c00632] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Affiliation(s)
- Bo Han
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China
- University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
| | - Chunping Ren
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China
| | - Lipeng Wu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, People’s Republic of China
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6
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Dumon AS, Rzepa HS, Alamillo-Ferrer C, Bures J, Procter R, Sheppard TD, Whiting A. A computational tool to accurately and quickly predict 19F NMR chemical shifts of molecules with fluorine-carbon and fluorine-boron bonds. Phys Chem Chem Phys 2022; 24:20409-20425. [PMID: 35983846 DOI: 10.1039/d2cp02317b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report the evaluation of density-functional-theory (DFT) based procedures for predicting 19F NMR chemical shifts at modest computational cost for a range of molecules with fluorine bonds, to be used as a tool for assisting the characterisation of reaction intermediates and products and as an aid to identifying mechanistic pathways. The results for a balanced learning set of molecules were then checked using two further testing sets, resulting in the recommendation of the ωB97XD/aug-cc-pvdz DFT method and basis set as having the best combination of accuracy and computational time, with a RMS error of 3.57 ppm. Cationic molecules calculated without counter-anion showed normal errors, whilst anionic molecules showed somewhat larger errors. The method was applied to the prediction of the conformationally averaged 19F chemical shifts of 2,2,3,3,4,4,5,5-octafluoropentan-1-ol, in which gauche stereoelectronic effects involving fluorine dominate and to determining the position of coordination equilibria of fluorinated boranes as an aid to verifying the relative energies of intermediate species involved in catalytic amidation reactions involving boron catalysts.
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Affiliation(s)
- Alexandre S Dumon
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, Wood Lane, London W12 OBZ, UK.
| | - Henry S Rzepa
- Department of Chemistry, Molecular Sciences Research Hub, Imperial College London, White City Campus, Wood Lane, London W12 OBZ, UK.
| | | | - Jordi Bures
- Department of Chemistry, The University of Manchester, Manchester M13 9PL, UK
| | - Richard Procter
- Department of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
| | - Tom D Sheppard
- Department of Chemistry, Christopher Ingold Laboratories, University College London, 20 Gordon Street, London, WC1H 0AJ, UK
| | - Andrew Whiting
- Centre for Sustainable Chemical Processes, Department of Chemistry, Science Laboratories, Durham University, South Road, Durham, DH1 3LE, UK
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7
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Regioselective Transfer Hydrogenative Defluorination of Polyfluoroarenes Catalyzed by Bifunctional Azairidacycle. ORGANICS 2022. [DOI: 10.3390/org3030012] [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
The catalytic hydrodefluorination (HDF) with a bifunctional azairidacycle using HCOOK was examined for cyano- and chloro-substituted fluoroarenes, including penta- and tetrafluorobenzonitriles, tetrafluoroterephthalonitrile, tetrafluorophthalonitrile, 3-chloro-2,4,5,6-tetrafluoropyridine, and 4-cyano-2,3,5,6-tetrafluoropyridine. The reaction was performed in the presence of a controlled amount of HCOOK with a substrate/catalyst ratio (S/C) of 100 in a 1:1 mixture of 1,2-dimethoxyethane (DME) and H2O at an ambient temperature of 30 °C to obtain partially fluorinated compounds with satisfactory regioselectivities. The C–F bond cleavage proceeded favorably at the para position of substituents other than fluorine, which is in consonance with the nucleophilic aromatic substitution mechanism. In the HDF of tetrafluoroterephthalonitrile and 4-cyano-2,3,5,6-tetrafluoropyridine, which do not contain a fluorine atom at the para position of the cyano group, the double defluorination occurred solely at the 2- and 5-positions, as confirmed by X-ray crystallography. The HDF of 3-chloro-2,4,5,6-tetrafluoropyridine gave preference to the C–F bond cleavage over the C–Cl bond cleavage, unlike the dehalogenation pathway via electron-transfer radical anion fragmentation. In addition, new azairidacycles with an electron-donating methoxy substituent on the C–N chelating ligand were synthesized and served as a catalyst precursor (0.2 mol%) for the transfer hydrogenative defluorination of pentafluoropyridine, leading to 2,3,5,6-tetrafluoropyridine with up to a turnover number (TON) of 418.
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8
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Moon HW, Cornella J. Bismuth Redox Catalysis: An Emerging Main-Group Platform for Organic Synthesis. ACS Catal 2022; 12:1382-1393. [PMID: 35096470 PMCID: PMC8787757 DOI: 10.1021/acscatal.1c04897] [Citation(s) in RCA: 68] [Impact Index Per Article: 34.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 12/09/2021] [Indexed: 12/11/2022]
Abstract
![]()
Bismuth has recently
been shown to be able to maneuver between
different oxidation states, enabling access to unique redox cycles
that can be harnessed in the context of organic synthesis. Indeed,
various catalytic Bi redox platforms have been discovered and revealed
emerging opportunities in the field of main group redox catalysis.
The goal of this perspective is to provide an overview of the synthetic
methodologies that have been developed to date, which capitalize on
the Bi redox cycling. Recent catalytic methods via low-valent Bi(II)/Bi(III),
Bi(I)/Bi(III), and high-valent Bi(III)/Bi(V) redox couples are covered
as well as their underlying mechanisms and key intermediates. In addition,
we illustrate different design strategies stabilizing low-valent and
high-valent bismuth species, and highlight the characteristic reactivity
of bismuth complexes, compared to the lighter p-block
and d-block elements. Although it is not redox catalysis
in nature, we also discuss a recent example of non-Lewis acid, redox-neutral
Bi(III) catalysis proceeding through catalytic organometallic steps.
We close by discussing opportunities and future directions in this
emerging field of catalysis. We hope that this Perspective will provide
synthetic chemists with guiding principles for the future development
of catalytic transformations employing bismuth.
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Affiliation(s)
- Hye Won Moon
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
| | - Josep Cornella
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr, 45470, Germany
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9
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Comadoll CG, Henke WC, Hopkins Leseberg JA, Douglas JT, Oliver AG, Day VW, Blakemore JD. Examining the Modular Synthesis of [Cp*Rh] Monohydrides Supported by Chelating Diphosphine Ligands. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00525] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chelsea G. Comadoll
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Wade C. Henke
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Julie A. Hopkins Leseberg
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Justin T. Douglas
- Nuclear Magnetic Resonance Laboratory, Molecular Structures Group, University of Kansas, 2034 Becker Drive, Lawrence, Kansas 66047, United States
| | - Allen G. Oliver
- Department of Chemistry and Biochemistry, University of Notre Dame, 149 Stepan Chemistry, Notre Dame, Indiana 46556, United States
| | - Victor W. Day
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - James D. Blakemore
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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10
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Pang Y, Leutzsch M, Nöthling N, Katzenburg F, Cornella J. Catalytic Hydrodefluorination via Oxidative Addition, Ligand Metathesis, and Reductive Elimination at Bi(I)/Bi(III) Centers. J Am Chem Soc 2021; 143:12487-12493. [PMID: 34358426 PMCID: PMC8377712 DOI: 10.1021/jacs.1c06735] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
Herein, we report a hydrodefluorination reaction of polyfluoroarenes catalyzed by bismuthinidenes, Phebox-Bi(I) and OMe-Phebox-Bi(I). Mechanistic studies on the elementary steps support a Bi(I)/Bi(III) redox cycle that comprises C(sp2)-F oxidative addition, F/H ligand metathesis, and C(sp2)-H reductive elimination. Isolation and characterization of a cationic Phebox-Bi(III)(4-tetrafluoropyridyl) triflate manifests the feasible oxidative addition of Phebox-Bi(I) into the C(sp2)-F bond. Spectroscopic evidence was provided for the formation of a transient Phebox-Bi(III)(4-tetrafluoropyridyl) hydride during catalysis, which decomposes at low temperature to afford the corresponding C(sp2)-H bond while regenerating the propagating Phebox-Bi(I). This protocol represents a distinct catalytic example where a main-group center performs three elementary organometallic steps in a low-valent redox manifold.
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Affiliation(s)
- Yue Pang
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
| | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
| | - Nils Nöthling
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
| | - Felix Katzenburg
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
| | - Josep Cornella
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr 45470, Germany
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11
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Hopkins Leseberg JA, Lionetti D, Day VW, Blakemore JD. Electrochemical Kinetic Study of [Cp*Rh] Complexes Supported by Bis(2-pyridyl)methane Ligands. Organometallics 2021. [DOI: 10.1021/acs.organomet.0c00747] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Julie A. Hopkins Leseberg
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Davide Lionetti
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - Victor W. Day
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
| | - James D. Blakemore
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, United States
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12
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Mengele AK, Rau S. The Metallic Traveler: Formate- and Photoinduced Regioselective Phenanthroline Deuterations via Reductively Activated RhCp* Centers. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexander K. Mengele
- Institute of Inorganic Chemistry I, Materials and Catalysis, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
| | - Sven Rau
- Institute of Inorganic Chemistry I, Materials and Catalysis, Ulm University, Albert-Einstein-Allee 11, 89081 Ulm, Germany
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13
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Moore JT, Lu CC. Catalytic Hydrogenolysis of Aryl C–F Bonds Using a Bimetallic Rhodium–Indium Complex. J Am Chem Soc 2020; 142:11641-11646. [DOI: 10.1021/jacs.0c04937] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- James T. Moore
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
| | - Connie C. Lu
- Department of Chemistry, University of Minnesota, Minneapolis, Minnesota 55455-0431, United States
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14
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Fukui M, Tanaka A, Kominami H. Photocatalytic Reductive Defluorination of Fluorinated Compounds in Aqueous Alcohol Suspensions of a Metal‐loaded Titanium(IV) Oxide. ChemCatChem 2020. [DOI: 10.1002/cctc.202000299] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Makoto Fukui
- Molecular and Material EngineeringInterdisciplinary Graduate School of Science and Engineering Kindai University 3-4-1 Kowakae Higashiosaka, Osaka 577-8502 Japan
| | - Atsuhiro Tanaka
- Department of Applied ChemistryFaculty of Science and Engineering Kindai University 3-4-1 Kowakae Higashiosaka, Osaka 577-8502 Japan
- Precursory Research for Embryonic Science and Technology (PRESTO)Japan Science and Technology Agency (JST) 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
| | - Hiroshi Kominami
- Department of Applied ChemistryFaculty of Science and Engineering Kindai University 3-4-1 Kowakae Higashiosaka, Osaka 577-8502 Japan
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15
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Zedler L, Mengele AK, Ziems KM, Zhang Y, Wächtler M, Gräfe S, Pascher T, Rau S, Kupfer S, Dietzek B. Unraveling the Light‐Activated Reaction Mechanism in a Catalytically Competent Key Intermediate of a Multifunctional Molecular Catalyst for Artificial Photosynthesis. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907247] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Linda Zedler
- Department Functional Interfaces Leibniz Institute of Photonic Technology Jena (IPHT) Albert-Einstein-Straße 9 07745 Jena Germany
| | - Alexander Klaus Mengele
- Department of Inorganic Chemistry I University of Ulm Albert-Einstein-Allee 11 89081 Ulm Germany
| | - Karl Michael Ziems
- Institute of Physical Chemistry and Abbe Center of Photonics Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena Germany
| | - Ying Zhang
- Department Functional Interfaces Leibniz Institute of Photonic Technology Jena (IPHT) Albert-Einstein-Straße 9 07745 Jena Germany
- Institute of Physical Chemistry and Abbe Center of Photonics Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena Germany
| | - Maria Wächtler
- Department Functional Interfaces Leibniz Institute of Photonic Technology Jena (IPHT) Albert-Einstein-Straße 9 07745 Jena Germany
- Institute of Physical Chemistry and Abbe Center of Photonics Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena Germany
| | - Stefanie Gräfe
- Institute of Physical Chemistry and Abbe Center of Photonics Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena Germany
| | - Torbjörn Pascher
- Pascher Instruments AB Stora Råby Byaväg 24 S-224 80 Lund Sweden
| | - Sven Rau
- Department of Inorganic Chemistry I University of Ulm Albert-Einstein-Allee 11 89081 Ulm Germany
| | - Stephan Kupfer
- Institute of Physical Chemistry and Abbe Center of Photonics Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena Germany
| | - Benjamin Dietzek
- Department Functional Interfaces Leibniz Institute of Photonic Technology Jena (IPHT) Albert-Einstein-Straße 9 07745 Jena Germany
- Institute of Physical Chemistry and Abbe Center of Photonics Friedrich Schiller University Jena Helmholtzweg 4 07743 Jena Germany
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16
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Zedler L, Mengele AK, Ziems KM, Zhang Y, Wächtler M, Gräfe S, Pascher T, Rau S, Kupfer S, Dietzek B. Unraveling the Light-Activated Reaction Mechanism in a Catalytically Competent Key Intermediate of a Multifunctional Molecular Catalyst for Artificial Photosynthesis. Angew Chem Int Ed Engl 2019; 58:13140-13148. [PMID: 31347251 PMCID: PMC6772164 DOI: 10.1002/anie.201907247] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Indexed: 11/07/2022]
Abstract
Understanding photodriven multielectron reaction pathways requires the identification and spectroscopic characterization of intermediates and their excited‐state dynamics, which is very challenging due to their short lifetimes. To the best of our knowledge, this manuscript reports for the first time on in situ spectroelectrochemistry as an alternative approach to study the excited‐state properties of reactive intermediates of photocatalytic cycles. UV/Vis, resonance‐Raman, and transient‐absorption spectroscopy have been employed to characterize the catalytically competent intermediate [(tbbpy)2RuII(tpphz)RhICp*] of [(tbbpy)2Ru(tpphz)Rh(Cp*)Cl]Cl(PF6)2 (Ru(tpphz)RhCp*), a photocatalyst for the hydrogenation of nicotinamide (NAD‐analogue) and proton reduction, generated by electrochemical and chemical reduction. Electronic transitions shifting electron density from the activated catalytic center to the bridging tpphz ligand significantly reduce the catalytic activity upon visible‐light irradiation.
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Affiliation(s)
- Linda Zedler
- Department Functional Interfaces, Leibniz Institute of Photonic Technology Jena (IPHT), Albert-Einstein-Straße 9, 07745, Jena, Germany
| | - Alexander Klaus Mengele
- Department of Inorganic Chemistry I, University of Ulm, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Karl Michael Ziems
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743, Jena, Germany
| | - Ying Zhang
- Department Functional Interfaces, Leibniz Institute of Photonic Technology Jena (IPHT), Albert-Einstein-Straße 9, 07745, Jena, Germany.,Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743, Jena, Germany
| | - Maria Wächtler
- Department Functional Interfaces, Leibniz Institute of Photonic Technology Jena (IPHT), Albert-Einstein-Straße 9, 07745, Jena, Germany.,Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743, Jena, Germany
| | - Stefanie Gräfe
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743, Jena, Germany
| | - Torbjörn Pascher
- Pascher Instruments AB, Stora Råby Byaväg 24, S-224 80, Lund, Sweden
| | - Sven Rau
- Department of Inorganic Chemistry I, University of Ulm, Albert-Einstein-Allee 11, 89081, Ulm, Germany
| | - Stephan Kupfer
- Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743, Jena, Germany
| | - Benjamin Dietzek
- Department Functional Interfaces, Leibniz Institute of Photonic Technology Jena (IPHT), Albert-Einstein-Straße 9, 07745, Jena, Germany.,Institute of Physical Chemistry and Abbe Center of Photonics, Friedrich Schiller University Jena, Helmholtzweg 4, 07743, Jena, Germany
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17
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Lionetti D, Day VW, Blakemore JD. Structural and chemical properties of half-sandwich rhodium complexes supported by the bis(2-pyridyl)methane ligand. Dalton Trans 2019; 48:12396-12406. [PMID: 31168559 DOI: 10.1039/c9dt01821b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
[Cp*Rh] complexes (Cp* = pentamethylcyclopentadienyl) supported by bidentate chelating ligands are a useful class of compounds for studies of redox chemistry and catalysis. Here, we show that the bis(2-pyridyl)methane ligand, also known as dipyridylmethane or dpma, can support [Cp*Rh] complexes in the formally +iii and +ii rhodium oxidation states. Specifically, two new rhodium complexes ([Cp*Rh(dpma)(L)]n+, L = Cl-, CH3CN) have been isolated and structurally characterized, and the properties of the complexes have been compared with those of [Cp*Rh] complexes bearing the related dimethyldipyridylmethane (Me2dpma) ligand. Complex [Cp*Rh(dpma)(NCCH3)]2+ displays a quasireversible rhodium(iii/ii) reduction by cyclic voltammetry; related electron paramagnetic resonance (EPR) spectroscopic studies confirm access to the unusual rhodium(ii) oxidation state. Further reduction to the formally rhodium(i) oxidation state, however, is followed by deprotonation of dpma, as observed in electrochemical studies and chemical reduction experiments. This reactivity can be understood to occur as a consequence of the presence of doubly benzylic protons in the dpma ligand, since use of the analogous Me2dpma enables reduction to rhodium(i) without involvement of ligand deprotonation. These findings highlight the important role of the ligand backbone substitution pattern in influencing the stability of highly-reduced complexes, a key class of metal species for study of electron and proton management in catalysis.
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Affiliation(s)
- Davide Lionetti
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, USA.
| | - Victor W Day
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, USA.
| | - James D Blakemore
- Department of Chemistry, University of Kansas, 1567 Irving Hill Road, Lawrence, Kansas 66045, USA.
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18
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Hopkins JA, Lionetti D, Day VW, Blakemore JD. Chemical and Electrochemical Properties of [Cp*Rh] Complexes Supported by a Hybrid Phosphine-Imine Ligand. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00551] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Julie A. Hopkins
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
| | - Davide Lionetti
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
| | - Victor W. Day
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
| | - James D. Blakemore
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
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19
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Lionetti D, Day VW, Lassalle-Kaiser B, Blakemore JD. Multiple binding modes of an unconjugated bis(pyridine) ligand stabilize low-valent [Cp*Rh] complexes. Chem Commun (Camb) 2018; 54:1694-1697. [DOI: 10.1039/c7cc09164h] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
An unconjugated bis(pyridine) ligand enables sequential one-electron reductions of a [Cp*Rh] complex, revealing the ligand's ability to stabilize low-valent species.
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Affiliation(s)
| | - Victor W. Day
- Department of Chemistry
- University of Kansas
- Lawrence
- USA
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20
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Matsunami A, Kuwata S, Kayaki Y. Hydrogen Evolution from Formic Acid and Hydrodefluorination of Fluoroarenes by Bifunctional Iridium Catalysts—Beyond the Transfer Hydrogenation. J SYN ORG CHEM JPN 2018. [DOI: 10.5059/yukigoseikyokaishi.76.315] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Asuka Matsunami
- College of Science and Engineering, Aoyama Gakuin University
| | - Shigeki Kuwata
- School of Materials and Chemical Technology, Tokyo Institute of Technology
- PRESTO, Japan Science and Technology Agency (JST)
| | - Yoshihito Kayaki
- School of Materials and Chemical Technology, Tokyo Institute of Technology
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21
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Wang Y, Wei C, Tang R, Zhan H, Lin J, Liu Z, Tao W, Fang Z. Silver-catalyzed intermolecular amination of fluoroarenes. Org Biomol Chem 2018; 16:6191-6194. [DOI: 10.1039/c8ob01749b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel highly selective Ag-catalyzed intermolecular amination of fluoroarenes has been developed.
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Affiliation(s)
- Yu Wang
- School of Chemistry and Environmental Engineering
- Yancheng Teachers University
- Yancheng 224007
- People's Republic of China
| | - Chenlong Wei
- School of Chemistry and Environmental Engineering
- Yancheng Teachers University
- Yancheng 224007
- People's Republic of China
| | - Ruyun Tang
- School of Chemistry and Environmental Engineering
- Yancheng Teachers University
- Yancheng 224007
- People's Republic of China
| | - Haosheng Zhan
- School of Chemistry and Environmental Engineering
- Yancheng Teachers University
- Yancheng 224007
- People's Republic of China
| | - Jing Lin
- School of Chemistry and Environmental Engineering
- Yancheng Teachers University
- Yancheng 224007
- People's Republic of China
| | - Zhenhua Liu
- College of Chemistry
- Chemical Engineering and Materials Science
- Shandong Normal University
- Jinan 250014
- People's Republic of China
| | - Weihua Tao
- School of Chemistry and Environmental Engineering
- Yancheng Teachers University
- Yancheng 224007
- People's Republic of China
| | - Zhongxue Fang
- School of Chemistry and Environmental Engineering
- Yancheng Teachers University
- Yancheng 224007
- People's Republic of China
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22
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Henke WC, Lionetti D, Moore WNG, Hopkins JA, Day VW, Blakemore JD. Ligand Substituents Govern the Efficiency and Mechanistic Path of Hydrogen Production with [Cp*Rh] Catalysts. CHEMSUSCHEM 2017; 10:4589-4598. [PMID: 29024563 DOI: 10.1002/cssc.201701416] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2017] [Revised: 09/01/2017] [Indexed: 06/07/2023]
Abstract
We demonstrate that [Cp*Rh] complexes bearing substituted 2,2'-bipyridyl ligands are effective hydrogen evolution catalysts (Cp*=η5 -pentamethylcyclopentadienyl). Disubstitution (at the 4 and 4' positions) of the bipyridyl ligand (namely -tBu, -H, and -CF3 ) modulates the catalytic overpotential, in part due to involvement of the reduced ligand character in formally rhodium(I) intermediates. These reduced species are synthesized and isolated here; protonation results in formation of complexes bearing the unusual η4 -pentamethylcyclopentadiene ligand, and the properties of these protonated intermediates further govern the catalytic performance. Electrochemical studies suggest that multiple mechanistic pathways are accessible, and that the operative pathway depends on the applied potential and solution conditions. Taken together, these results suggest synergy in metal-ligand cooperation that modulates the mechanisms of fuel-forming catalysis with organometallic compounds bearing multiple non-innocent ligands.
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Affiliation(s)
- Wade C Henke
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS, 66045, USA
| | - Davide Lionetti
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS, 66045, USA
| | - William N G Moore
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS, 66045, USA
| | - Julie A Hopkins
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS, 66045, USA
| | - Victor W Day
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS, 66045, USA
| | - James D Blakemore
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, KS, 66045, USA
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23
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Johnson SI, Gray HB, Blakemore JD, Goddard WA. Role of Ligand Protonation in Dihydrogen Evolution from a Pentamethylcyclopentadienyl Rhodium Catalyst. Inorg Chem 2017; 56:11375-11386. [DOI: 10.1021/acs.inorgchem.7b01698] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Samantha I. Johnson
- Center for Chemical
Innovation in Solar Fuels, California Institute of Technology, Pasadena, California 91125, United States
- Materials Research Center, California Institute of Technology, Pasadena, California 91125, United States
| | - Harry B. Gray
- Center for Chemical
Innovation in Solar Fuels, California Institute of Technology, Pasadena, California 91125, United States
| | - James D. Blakemore
- Department of Chemistry, University of Kansas, Lawrence, Kansas 66045-7582, United States
| | - William A. Goddard
- Materials Research Center, California Institute of Technology, Pasadena, California 91125, United States
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24
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Peng Y, Ramos-Garcés MV, Lionetti D, Blakemore JD. Structural and Electrochemical Consequences of [Cp*] Ligand Protonation. Inorg Chem 2017; 56:10824-10831. [PMID: 28832122 DOI: 10.1021/acs.inorgchem.7b01895] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yun Peng
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
| | - Mario V. Ramos-Garcés
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
| | - Davide Lionetti
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
| | - James D. Blakemore
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045-7582, United States
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25
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Sahoo B, Surkus AE, Pohl MM, Radnik J, Schneider M, Bachmann S, Scalone M, Junge K, Beller M. A Biomass-Derived Non-Noble Cobalt Catalyst for Selective Hydrodehalogenation of Alkyl and (Hetero)Aryl Halides. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201702478] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Basudev Sahoo
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Annette-Enrica Surkus
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Marga-Martina Pohl
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Jörg Radnik
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Matthias Schneider
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Stephan Bachmann
- Process Chemistry and Catalysis; F. Hoffmann-La Roche Ltd.; Grenzacherstrasse 124 4070 Basel Switzerland
| | - Michelangelo Scalone
- Process Chemistry and Catalysis; F. Hoffmann-La Roche Ltd.; Grenzacherstrasse 124 4070 Basel Switzerland
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
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26
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Sahoo B, Surkus AE, Pohl MM, Radnik J, Schneider M, Bachmann S, Scalone M, Junge K, Beller M. A Biomass-Derived Non-Noble Cobalt Catalyst for Selective Hydrodehalogenation of Alkyl and (Hetero)Aryl Halides. Angew Chem Int Ed Engl 2017; 56:11242-11247. [DOI: 10.1002/anie.201702478] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2017] [Revised: 04/27/2017] [Indexed: 12/22/2022]
Affiliation(s)
- Basudev Sahoo
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Annette-Enrica Surkus
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Marga-Martina Pohl
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Jörg Radnik
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Matthias Schneider
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Stephan Bachmann
- Process Chemistry and Catalysis; F. Hoffmann-La Roche Ltd.; Grenzacherstrasse 124 4070 Basel Switzerland
| | - Michelangelo Scalone
- Process Chemistry and Catalysis; F. Hoffmann-La Roche Ltd.; Grenzacherstrasse 124 4070 Basel Switzerland
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V. an der; Universität Rostock; Albert-Einstein-Straße 29a 18059 Rostock Germany
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27
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Cybulski MK, Nicholls JE, Lowe JP, Mahon MF, Whittlesey MK. Catalytic Hydrodefluorination of Fluoroarenes Using Ru(IMe4)2L2H2 (IMe4 = 1,3,4,5-Tetramethylimidazol-2-ylidene; L2 = (PPh3)2, dppe, dppp, dppm) Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00243] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Mateusz K. Cybulski
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Jessica E. Nicholls
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - John P. Lowe
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Mary F. Mahon
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
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28
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Product Selectivity in Homogeneous Artificial Photosynthesis Using [(bpy)Rh(Cp*)X]n+-Based Catalysts. INORGANICS 2017. [DOI: 10.3390/inorganics5020035] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Due to the limited amount of fossil energy carriers, the storage of solar energy in chemical bonds using artificial photosynthesis has been under intensive investigation within the last decades. As the understanding of the underlying working principle of these complex systems continuously grows, more focus will be placed on a catalyst design for highly selective product formation. Recent reports have shown that multifunctional photocatalysts can operate with high chemoselectivity, forming different catalysis products under appropriate reaction conditions. Within this context [(bpy)Rh(Cp*)X]n+-based catalysts are highly relevant examples for a detailed understanding of product selectivity in artificial photosynthesis since the identification of a number of possible reaction intermediates has already been achieved.
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29
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Affiliation(s)
- Catherine L. Pitman
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Alexander J. M. Miller
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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30
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Lionetti D, Day VW, Blakemore JD. Synthesis and Electrochemical Properties of Half-Sandwich Rhodium and Iridium Methyl Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00136] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Davide Lionetti
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
| | - Victor W. Day
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
| | - James D. Blakemore
- Department of Chemistry, University of Kansas, 1251 Wescoe Hall Drive, Lawrence, Kansas 66045, United States
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31
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Cybulski MK, McKay D, Macgregor SA, Mahon MF, Whittlesey MK. Room Temperature Regioselective Catalytic Hydrodefluorination of Fluoroarenes with
trans
‐[Ru(NHC)
4
H
2
] through a Concerted Nucleophilic Ru−H Attack Pathway. Angew Chem Int Ed Engl 2017; 56:1515-1519. [DOI: 10.1002/anie.201610820] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2016] [Revised: 12/11/2016] [Indexed: 11/09/2022]
Affiliation(s)
| | - David McKay
- Institute of Chemical SciencesHeriot Watt University Edinburgh EH14 4AS UK
| | | | - Mary F. Mahon
- Department of ChemistryUniversity of Bath Claverton Down Bath BA2 7AY UK
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32
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Chen J, Huang D, Ding Y. Rhodium-Catalyzedortho-Selective C-F Activation and Hydrodefluorination of Heterocycle-Substituted Polyfluoroarenes: Dominated by Phosphine Ligands. ChemistrySelect 2017. [DOI: 10.1002/slct.201601839] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jianping Chen
- The Key Laboratory of Food Colloids and Biotechnology; Ministry of Education; School of Chemical and Material Engineering; Jiangnan University; 1800 Lihu Road Wuxi, Jiangsu Province 214122 China
| | - Dongyang Huang
- The Key Laboratory of Food Colloids and Biotechnology; Ministry of Education; School of Chemical and Material Engineering; Jiangnan University; 1800 Lihu Road Wuxi, Jiangsu Province 214122 China
| | - Yuqiang Ding
- The Key Laboratory of Food Colloids and Biotechnology; Ministry of Education; School of Chemical and Material Engineering; Jiangnan University; 1800 Lihu Road Wuxi, Jiangsu Province 214122 China
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33
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Cybulski MK, McKay D, Macgregor SA, Mahon MF, Whittlesey MK. Room Temperature Regioselective Catalytic Hydrodefluorination of Fluoroarenes withtrans-[Ru(NHC)4H2] through a Concerted Nucleophilic Ru−H Attack Pathway. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201610820] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | - David McKay
- Institute of Chemical Sciences; Heriot Watt University; Edinburgh EH14 4AS UK
| | - Stuart A. Macgregor
- Institute of Chemical Sciences; Heriot Watt University; Edinburgh EH14 4AS UK
| | - Mary F. Mahon
- Department of Chemistry; University of Bath; Claverton Down Bath BA2 7AY UK
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34
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Brereton KR, Pitman CL, Cundari TR, Miller AJM. Solvent-Dependent Thermochemistry of an Iridium/Ruthenium H2 Evolution Catalyst. Inorg Chem 2016; 55:12042-12051. [DOI: 10.1021/acs.inorgchem.6b02223] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Kelsey R. Brereton
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Catherine L. Pitman
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Thomas R. Cundari
- Department
of Chemistry and CASCaM, University of North Texas, Denton, Texas 76203, United States
| | - Alexander J. M. Miller
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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35
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Porras JA, Mills IN, Transue WJ, Bernhard S. Highly Fluorinated Ir(III)-2,2':6',2″-Terpyridine-Phenylpyridine-X Complexes via Selective C-F Activation: Robust Photocatalysts for Solar Fuel Generation and Photoredox Catalysis. J Am Chem Soc 2016; 138:9460-72. [PMID: 27387149 DOI: 10.1021/jacs.6b03246] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
A series of fluorinated Ir(III)-terpyridine-phenylpyridine-X (X = anionic monodentate ligand) complexes were synthesized by selective C-F activation, whereby perfluorinated phenylpyridines were readily complexed. The combination of fluorinated phenylpyridine ligands with an electron-rich tri-tert-butyl terpyridine ligand generates a "push-pull" force on the electrons upon excitation, imparting significant enhancements to the stability, electrochemical, and photophysical properties of the complexes. Application of the complexes as photosensitizers for photocatalytic generation of hydrogen from water and as redox photocatalysts for decarboxylative fluorination of several carboxylic acids showcases the performance of the complexes in highly coordinating solvents, in some cases exceeding that of the leading photosensitizers. Changes in the photophysical properties and the nature of the excited states are observed as the compounds increase in fluorination as well as upon exchange of the ancillary chloride ligand to a cyanide. These changes in the excited states have been corroborated using density functional theory modeling.
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Affiliation(s)
- Jonathan A Porras
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Isaac N Mills
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Wesley J Transue
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
| | - Stefan Bernhard
- Department of Chemistry, Carnegie Mellon University , Pittsburgh, Pennsylvania 15213, United States
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Matsunami A, Kuwata S, Kayaki Y. Hydrodefluorination of Fluoroarenes Using Hydrogen Transfer Catalysts with a Bifunctional Iridium/NH Moiety. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01590] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Asuka Matsunami
- Department
of Chemical Science and Engineering, School of Materials and Chemical
Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
| | - Shigeki Kuwata
- Department
of Chemical Science and Engineering, School of Materials and Chemical
Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
- PRESTO, Japan Science and Technology Agency (JST), 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan
| | - Yoshihito Kayaki
- Department
of Chemical Science and Engineering, School of Materials and Chemical
Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan
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37
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Abstract
Efficient generation of hydrogen from renewable resources requires development of catalysts that avoid deep wells and high barriers. Information about the energy landscape for H2 production can be obtained by chemical characterization of catalytic intermediates, but few have been observed to date. We have isolated and characterized a key intermediate in 2e(-) + 2H(+) → H2 catalysis. This intermediate, obtained by treatment of Cp*Rh(bpy) (Cp*, η(5)-pentamethylcyclopentadienyl; bpy, κ(2)-2,2'-bipyridyl) with acid, is not a hydride species but rather, bears [η(4)-Cp*H] as a ligand. Delivery of a second proton to this species leads to evolution of H2 and reformation of η(5)-Cp* bound to rhodium(III). With suitable choices of acids and bases, the Cp*Rh(bpy) complex catalyzes facile and reversible interconversion of H(+) and H2.
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38
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Wang L, Sun H, Li X, Fuhr O, Fenske D. The selective activation of a C–F bond with an auxiliary strong Lewis acid: a method to change the activation preference of C–F and C–H bonds. Dalton Trans 2016; 45:18133-18141. [DOI: 10.1039/c6dt03235d] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Selective activations of C–F bond in substituted (2,6-difluorophenyl)phenylimines by Fe(PMe3)4 with an auxiliary strong Lewis acid were explored.
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Affiliation(s)
- Lin Wang
- School of Chemistry and Chemical Engineering
- Key Laboratory of Special Functional Aggregated Materials
- Ministry of Education
- Shandong University
- 250199 Jinan
| | - Hongjian Sun
- School of Chemistry and Chemical Engineering
- Key Laboratory of Special Functional Aggregated Materials
- Ministry of Education
- Shandong University
- 250199 Jinan
| | - Xiaoyan Li
- School of Chemistry and Chemical Engineering
- Key Laboratory of Special Functional Aggregated Materials
- Ministry of Education
- Shandong University
- 250199 Jinan
| | - Olaf Fuhr
- Institut für Nanotechnologie (INT) und Karlsruher Nano-Micro-Facility (KNMF)
- Karlsruher Institut für Technologie (KIT)
- 76344 Eggenstein-Leopoldshafen
- Germany
| | - Dieter Fenske
- Institut für Nanotechnologie (INT) und Karlsruher Nano-Micro-Facility (KNMF)
- Karlsruher Institut für Technologie (KIT)
- 76344 Eggenstein-Leopoldshafen
- Germany
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39
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Wang L, Sun H, Li X. Imine Nitrogen Bridged Binuclear Nickel Complexes via N–H Bond Activation: Synthesis, Characterization, Unexpected C,N-Coupling Reaction, and Their Catalytic Application in Hydrosilylation of Aldehydes. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00734] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Lin Wang
- School of Chemistry and Chemical
Engineering, Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Shanda Nanlu 27, 250199 Jinan, People’s Republic of China
| | - Hongjian Sun
- School of Chemistry and Chemical
Engineering, Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Shanda Nanlu 27, 250199 Jinan, People’s Republic of China
| | - Xiaoyan Li
- School of Chemistry and Chemical
Engineering, Key Laboratory of Special Functional Aggregated Materials, Ministry of Education, Shandong University, Shanda Nanlu 27, 250199 Jinan, People’s Republic of China
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40
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Wang L, Sun H, Li X. Synthesis of Iron Hydrides by Selective C-F/C-H Bond Activation in Fluoroarylimines and Their Applications in Catalytic Reduction Reactions. Eur J Inorg Chem 2015. [DOI: 10.1002/ejic.201500313] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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41
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Cybulski MK, Riddlestone IM, Mahon MF, Woodman TJ, Whittlesey MK. Stoichiometric and catalytic C–F bond activation by the trans-dihydride NHC complex [Ru(IEt2Me2)2(PPh3)2H2] (IEt2Me2= 1,3-diethyl-4,5-dimethylimidazol-2-ylidene). Dalton Trans 2015; 44:19597-605. [DOI: 10.1039/c5dt01996f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Multiple catalytic hydrodefluorination steps take place with thetrans-dihydride complex [Ru(IEt2Me2)2(PPh3)2H2] (1), taking C6F6to tri-, di- and mono-fluorobenzenes.
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Affiliation(s)
| | | | - Mary F. Mahon
- Department of Chemistry
- University of Bath
- Bath BA2 7AY
- UK
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