1
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Ehrhorn H, Bockfeld D, Freytag M, Bannenberg T, Kefalidis CE, Maron L, Tamm M. Studies on Molybdena- and Tungstenacyclobutadiene Complexes Supported by Fluoroalkoxy Ligands as Intermediates of Alkyne Metathesis. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00068] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Henrike Ehrhorn
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Dirk Bockfeld
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Matthias Freytag
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Christos E. Kefalidis
- Institut National des Sciences Appliquées, Université de Toulouse, CNRS, INSA, UPS, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Laurent Maron
- Institut National des Sciences Appliquées, Université de Toulouse, CNRS, INSA, UPS, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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2
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Gardner BM, Kefalidis CE, Lu E, Patel D, McInnes EJL, Tuna F, Wooles AJ, Maron L, Liddle ST. Evidence for single metal two electron oxidative addition and reductive elimination at uranium. Nat Commun 2017; 8:1898. [PMID: 29196691 PMCID: PMC5711956 DOI: 10.1038/s41467-017-01363-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 09/11/2017] [Indexed: 11/18/2022] Open
Abstract
Reversible single-metal two-electron oxidative addition and reductive elimination are common fundamental reactions for transition metals that underpin major catalytic transformations. However, these reactions have never been observed together in the f-block because these metals exhibit irreversible one- or multi-electron oxidation or reduction reactions. Here we report that azobenzene oxidises sterically and electronically unsaturated uranium(III) complexes to afford a uranium(V)-imido complex in a reaction that satisfies all criteria of a single-metal two-electron oxidative addition. Thermolysis of this complex promotes extrusion of azobenzene, where H-/D-isotopic labelling finds no isotopomer cross-over and the non-reactivity of a nitrene-trap suggests that nitrenes are not generated and thus a reductive elimination has occurred. Though not optimally balanced in this case, this work presents evidence that classical d-block redox chemistry can be performed reversibly by f-block metals, and that uranium can thus mimic elementary transition metal reactivity, which may lead to the discovery of new f-block catalysis. The reactivity of f-block complexes is primarily defined by single-electron oxidations and σ-bond metathesis. Here, Liddle and co-workers provide evidence that a uranium complex can undergo reversible oxidative addition and reductive elimination, demonstrating transition metal-like reactivity within f-block chemistry.
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Affiliation(s)
- Benedict M Gardner
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Christos E Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse, 31077, France
| | - Erli Lu
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Dipti Patel
- School of Chemistry, University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Eric J L McInnes
- EPSRC National UK EPR Facility, School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Floriana Tuna
- EPSRC National UK EPR Facility, School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Ashley J Wooles
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Laurent Maron
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse, 31077, France.
| | - Stephen T Liddle
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK.
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3
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Xémard M, Goudy V, Braun A, Tricoire M, Cordier M, Ricard L, Castro L, Louyriac E, Kefalidis CE, Clavaguéra C, Maron L, Nocton G. Reductive Disproportionation of CO2 with Bulky Divalent Samarium Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00630] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mathieu Xémard
- LCM,
CNRS, Ecole polytechnique, Université Paris-Saclay, Route de
Saclay, 91128 Palaiseau
Cedex, France
| | - Violaine Goudy
- LCM,
CNRS, Ecole polytechnique, Université Paris-Saclay, Route de
Saclay, 91128 Palaiseau
Cedex, France
| | - Augustin Braun
- LCM,
CNRS, Ecole polytechnique, Université Paris-Saclay, Route de
Saclay, 91128 Palaiseau
Cedex, France
| | - Maxime Tricoire
- LCM,
CNRS, Ecole polytechnique, Université Paris-Saclay, Route de
Saclay, 91128 Palaiseau
Cedex, France
| | - Marie Cordier
- LCM,
CNRS, Ecole polytechnique, Université Paris-Saclay, Route de
Saclay, 91128 Palaiseau
Cedex, France
| | - Louis Ricard
- LCM,
CNRS, Ecole polytechnique, Université Paris-Saclay, Route de
Saclay, 91128 Palaiseau
Cedex, France
| | - Ludovic Castro
- LPCNO,
UMR 5215, Université de Toulouse-CNRS, INSA, UPS, Toulouse, France
| | - Elisa Louyriac
- LPCNO,
UMR 5215, Université de Toulouse-CNRS, INSA, UPS, Toulouse, France
| | | | - Carine Clavaguéra
- Laboratoire
de Chimie Physique, CNRS-Université Paris-Sud, Université Paris-Saclay, 15 avenue Jean Perrin, 91405 Orsay Cedex, France
| | - Laurent Maron
- LPCNO,
UMR 5215, Université de Toulouse-CNRS, INSA, UPS, Toulouse, France
| | - Grégory Nocton
- LCM,
CNRS, Ecole polytechnique, Université Paris-Saclay, Route de
Saclay, 91128 Palaiseau
Cedex, France
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Anker MD, Kefalidis CE, Yang Y, Fang J, Hill MS, Mahon MF, Maron L. Alkaline Earth-Centered CO Homologation, Reduction, and Amine Carbonylation. J Am Chem Soc 2017. [DOI: 10.1021/jacs.7b04926] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Mathew D. Anker
- Department
of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Christos E. Kefalidis
- Université de Toulouse and CNRS, INSA, UPS, UMR
5215, LPCNO, 135 Avenue de Rangueil, F-31077 Toulouse, France
| | - Yan Yang
- Key
Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P.R. China
| | - Jian Fang
- Key
Laboratory of Nonferrous Metal Chemistry and Resources Utilization
of Gansu Province, School of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, P.R. China
| | - Michael S. Hill
- 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
- X-ray
Crystallographic Suite, Department of Chemistry, University of Bath, Claverton Down, Bath BA2
7AY, U.K
| | - Laurent Maron
- Université de Toulouse and CNRS, INSA, UPS, UMR
5215, LPCNO, 135 Avenue de Rangueil, F-31077 Toulouse, France
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Brunel P, Monot J, Kefalidis CE, Maron L, Martin-Vaca B, Bourissou D. Valorization of CO2: Preparation of 2-Oxazolidinones by Metal–Ligand Cooperative Catalysis with SCS Indenediide Pd Complexes. ACS Catal 2017. [DOI: 10.1021/acscatal.7b00209] [Citation(s) in RCA: 68] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Paul Brunel
- UPS,
LHFA, UMR 5069 CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France
| | - Julien Monot
- UPS,
LHFA, UMR 5069 CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France
| | - Christos E. Kefalidis
- INSA,
UPS, LPCNO, UMR 5215 CNRS, Université de Toulouse, 135 avenue de Rangueil, 31400 Toulouse, France
| | - Laurent Maron
- INSA,
UPS, LPCNO, UMR 5215 CNRS, Université de Toulouse, 135 avenue de Rangueil, 31400 Toulouse, France
| | - Blanca Martin-Vaca
- UPS,
LHFA, UMR 5069 CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France
| | - Didier Bourissou
- UPS,
LHFA, UMR 5069 CNRS, Université de Toulouse, 118 route de Narbonne, F-31062 Toulouse, France
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6
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Hadlington TJ, Kefalidis CE, Maron L, Jones C. Efficient Reduction of Carbon Dioxide to Methanol Equivalents Catalyzed by Two-Coordinate Amido–Germanium(II) and −Tin(II) Hydride Complexes. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03306] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Terrance J. Hadlington
- Monash
Centre for Catalysis, School of Chemistry, Monash University, P.O. Box 23, Melbourne, Victoria 3800, Australia
| | - Christos E. Kefalidis
- Université de Toulouse et CNRS, INSA, UPS, UMR 5215,
LPCNO, 135 Avenue de Rangueil, F-31077 Toulouse, France
| | - Laurent Maron
- Université de Toulouse et CNRS, INSA, UPS, UMR 5215,
LPCNO, 135 Avenue de Rangueil, F-31077 Toulouse, France
| | - Cameron Jones
- Monash
Centre for Catalysis, School of Chemistry, Monash University, P.O. Box 23, Melbourne, Victoria 3800, Australia
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Cleaves PA, Kefalidis CE, Gardner BM, Tuna F, McInnes EJL, Lewis W, Maron L, Liddle ST. Terminal Uranium(V/VI) Nitride Activation of Carbon Dioxide and Carbon Disulfide: Factors Governing Diverse and Well-Defined Cleavage and Redox Reactions. Chemistry 2017; 23:2950-2959. [PMID: 28075505 DOI: 10.1002/chem.201605620] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Indexed: 01/22/2023]
Abstract
The reactivity of terminal uranium(V/VI) nitrides with CE2 (E=O, S) is presented. Well-defined C=E cleavage followed by zero-, one-, and two-electron redox events is observed. The uranium(V) nitride [U(TrenTIPS )(N)][K(B15C5)2 ] (1, TrenTIPS =N(CH2 CH2 NSiiPr3 )3 ; B15C5=benzo-15-crown-5) reacts with CO2 to give [U(TrenTIPS )(O)(NCO)][K(B15C5)2 ] (3), whereas the uranium(VI) nitride [U(TrenTIPS )(N)] (2) reacts with CO2 to give isolable [U(TrenTIPS )(O)(NCO)] (4); complex 4 rapidly decomposes to known [U(TrenTIPS )(O)] (5) with concomitant formation of N2 and CO proposed, with the latter trapped as a vanadocene adduct. In contrast, 1 reacts with CS2 to give [U(TrenTIPS )(κ2 -CS3 )][K(B15C5)2 ] (6), 2, and [K(B15C5)2 ][NCS] (7), whereas 2 reacts with CS2 to give [U(TrenTIPS )(NCS)] (8) and "S", with the latter trapped as Ph3 PS. Calculated reaction profiles reveal outer-sphere reactivity for uranium(V) but inner-sphere mechanisms for uranium(VI); despite the wide divergence of products the initial activation of CE2 follows mechanistically related pathways, providing insight into the factors of uranium oxidation state, chalcogen, and NCE groups that govern the subsequent divergent redox reactions that include common one-electron reactions and a less-common two-electron redox event. Caution, we suggest, is warranted when utilising CS2 as a reactivity surrogate for CO2 .
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Affiliation(s)
- Peter A Cleaves
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Christos E Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse, 31077, France
| | - Benedict M Gardner
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - Eric J L McInnes
- School of Chemistry and Photon Science Institute, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
| | - William Lewis
- School of Chemistry, The University of Nottingham, University Park, Nottingham, NG7 2RD, UK
| | - Laurent Maron
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse, 31077, France
| | - Stephen T Liddle
- School of Chemistry, The University of Manchester, Oxford Road, Manchester, M13 9PL, UK
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8
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Kefalidis CE, Jones C, Maron L. Mechanistic insights from theory on the reduction of CO2, N2O, and SO2 molecules using tripodal diimine-enolate substituted magnesium(i) dimers. Dalton Trans 2016; 45:14789-800. [PMID: 27518264 DOI: 10.1039/c6dt02189a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
The mechanistic investigation of the reductive coupling vs. reductive disproportionation of CO2 using magnesium(i) dimers bearing tripodal ligands, [{Mg[κ(3)-N,N',O-(ArNCMe)2(OCCPh2)CH]}2] (Ar = C6H3Et2-2,6) has been carried out using DFT computational methods. We also elucidated the reduction of N2O to form a μ-oxo magnesium complex which upon addition of CO2 affords the experimentally observed carbonate complex. Finally, the interesting reactivity towards SO2 is considered and some insights into the mechanistic aspects of such activation/homo-coupling reaction are given for both "Nacnac" substituted magnesium(i) dimers ([{((Dip)Nacnac)Mg}2] ((Dip)Nacnac = [(DipNCMe)2CH](-), Dip = C6H3Pr(i)2-2,6)) and those bearing tripodal ligands. The analogy between the activation chemistry of low-valent f-block metal complexes with that of magnesium systems is highlighted.
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Affiliation(s)
- Christos E Kefalidis
- LPCNO, UMR 5215, Université de Toulouse - CNRS, INSA, UPS, 135 Avenue de Rangueil, 31077 Toulouse, France.
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Affiliation(s)
- Allen L. Chan
- Center for Catalysis,
Department of Chemistry, University of California Riverside, Riverside, California 92521, United States
| | - Jess Estrada
- Center for Catalysis,
Department of Chemistry, University of California Riverside, Riverside, California 92521, United States
| | - Christos E. Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse 31077, France
| | - Vincent Lavallo
- Center for Catalysis,
Department of Chemistry, University of California Riverside, Riverside, California 92521, United States
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10
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Falcone M, Kefalidis CE, Scopelliti R, Maron L, Mazzanti M. Facile CO Cleavage by a Multimetallic CsU2 Nitride Complex. Angew Chem Int Ed Engl 2016; 55:12290-4. [PMID: 27596570 DOI: 10.1002/anie.201606796] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Indexed: 11/07/2022]
Abstract
Uranium nitrides are important materials with potential for application as fuels for nuclear power generation, and as highly active catalysts. Molecular nitride compounds could provide important insight into the nature of the uranium-nitride bond, but currently little is known about their reactivity. In this study, we found that a complex containing a nitride bridging two uranium centers and a cesium cation readily cleaved the C≡O bond (one of the strongest bonds in nature) under ambient conditions. The product formed has a [CsU2 (μ-CN)(μ-O)] core, thus indicating that the three cations cooperate to cleave CO. Moreover, the addition of MeOTf to the nitride complex led to an exceptional valence disproportionation of the CsU(IV) -N-U(IV) core to yield CsU(III) (OTf) and [MeN=U(V) ] fragments. The important role of multimetallic cooperativity in both reactions is illustrated by the computed reaction mechanisms.
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Affiliation(s)
- Marta Falcone
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Christos E Kefalidis
- LPCNO,CNRS & INSA, UPS, Université de Toulouse, 135 Avenue de Rangueil, 31077, Toulouse, France
| | - Rosario Scopelliti
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland
| | - Laurent Maron
- LPCNO,CNRS & INSA, UPS, Université de Toulouse, 135 Avenue de Rangueil, 31077, Toulouse, France.
| | - Marinella Mazzanti
- Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL), 1015, Lausanne, Switzerland.
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11
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Spasyuk DM, Carpenter SH, Kefalidis CE, Piers WE, Neidig ML, Maron L. Facile hydrogen atom transfer to iron(iii) imido radical complexes supported by a dianionic pentadentate ligand. Chem Sci 2016; 7:5939-5944. [PMID: 30034736 PMCID: PMC6024611 DOI: 10.1039/c6sc01433j] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 05/28/2016] [Indexed: 12/28/2022] Open
Abstract
Facile hydrogen atom transfer from toluene.
A dianionic tetrapodal pentadentate diborate ligand is introduced. This ligand forms a high spin neutral iron(ii) complex that reacts with a variety of organoazides to yield transient Fe(iii) imido radicals that are extremely potent hydrogen atom abstractors. The nature of these species is supported by full characterization of the Fe(iii) amido products, kinetic studies, density functional computations and Mössbauer spectroscopy on the –C6H4-p-tBu substituted derivative.
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Affiliation(s)
- Denis M Spasyuk
- University of Calgary , Department of Chemistry , 2500 University Drive N.W. , Calgary , Alberta , Canada T2N 1N4 .
| | - Stephanie H Carpenter
- Department of Chemistry , University of Rochester , Rochester , New York 14627 , USA
| | - Christos E Kefalidis
- LPCNO , Université de Toulouse , INSA , UPS , CNRS , 135 avenue de Rangueil , F-31077 Toulouse , France
| | - Warren E Piers
- University of Calgary , Department of Chemistry , 2500 University Drive N.W. , Calgary , Alberta , Canada T2N 1N4 .
| | - Michael L Neidig
- Department of Chemistry , University of Rochester , Rochester , New York 14627 , USA
| | - Laurent Maron
- LPCNO , Université de Toulouse , INSA , UPS , CNRS , 135 avenue de Rangueil , F-31077 Toulouse , France
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Andrez J, Pécaut J, Scopelliti R, Kefalidis CE, Maron L, Rosenzweig MW, Meyer K, Mazzanti M. Synthesis and reactivity of a terminal uranium(iv) sulfide supported by siloxide ligands. Chem Sci 2016; 7:5846-5856. [PMID: 30034725 PMCID: PMC6024242 DOI: 10.1039/c6sc00675b] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2016] [Accepted: 04/08/2016] [Indexed: 11/26/2022] Open
Abstract
The S-transfer reaction from Ph3PS to the tetrasiloxide U(iii) complex [U(OSi(OtBu)3)4K] affords a stable U(iv) triply bonded terminal sulfide that can be protonated to yield a U(iv) doubly bonded terminal hydrosulfide.
The reactions of the tetrasiloxide U(iii) complexes [U(OSi(OtBu)3)4K] and [U(OSi(OtBu)3)4][K18c6] with 0.5 equiv. of triphenylphosphine sulfide led to reductive S-transfer reactions, affording the U(iv) sulfide complexes [SU(OSi(OtBu)3)4K2]2, 1, and [{SU(OSi(OtBu)3)4K2}2(μ-18c6)], 2, with concomitant formation of the U(iv) complex [U(OSi(OtBu)3)4]. Addition of 1 equiv. of 2.2.2-cryptand to complex 1 resulted in the isolation of a terminal sulfide complex, [SU(OSi(OtBu)3)4K][Kcryptand], 3. The crucial role of the K+ Lewis acid in these reductive sulfur transfer reactions was confirmed, since the formation of complex 3 from the reaction of the U(iii) complex [U(OSi(OtBu)3)4][Kcryptand] and 0.5 equiv. of PPh3S was not possible. Reactivity studies of the U(iv) sulfide complexes showed that the sulfide is easily transferred to CO2 and CS2 to afford S-functionalized products. Moreover, we have found that the sulfide provides a convenient precursor for the synthesis of the corresponding U(iv) hydrosulfide, {[(SH)U(OSi(OtBu)3)4][K18c6]}, 5, after protonation with PyHCl. Finally, DFT calculations were performed to investigate the nature of the U–S bond in complexes 1, 3 and 5. Based on various analyses, triple-bond character was suggested for the U–S bond in complexes 1 and 3, while double-bond character was determined for the U–SH bond in complex 5.
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Affiliation(s)
- Julie Andrez
- Institut des Sciences et Ingénierie Chimiques Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland .
| | - Jacques Pécaut
- Univ. Grenoble Alpes , INAC-SyMMES , RICC , F-38000 Grenoble , France.,CEA , INAC-SyMMES , F-38000 Grenoble , France
| | - Rosario Scopelliti
- Institut des Sciences et Ingénierie Chimiques Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland .
| | - Christos E Kefalidis
- Université de Toulouse et CNRS INSA , UPS , CNRS , UMR 5215 , LPCNO , 135 avenue de Rangueil , 31077 Toulouse , France
| | - Laurent Maron
- Université de Toulouse et CNRS INSA , UPS , CNRS , UMR 5215 , LPCNO , 135 avenue de Rangueil , 31077 Toulouse , France
| | - Michael W Rosenzweig
- Department of Chemistry and Pharmacy , Inorganic Chemistry , Friedrich-Alexander University Erlangen-Nürnberg , Egerlandstraße 1 , 91058 Erlangen , Germany
| | - Karsten Meyer
- Department of Chemistry and Pharmacy , Inorganic Chemistry , Friedrich-Alexander University Erlangen-Nürnberg , Egerlandstraße 1 , 91058 Erlangen , Germany
| | - Marinella Mazzanti
- Institut des Sciences et Ingénierie Chimiques Ecole Polytechnique Fédérale de Lausanne (EPFL) , 1015 Lausanne , Switzerland .
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13
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Kefalidis CE, Maron L. Insights into the Cascade Reaction of CO and Heteroallenes Mediated by Dinitrogen Hafnocene Complexes: The Indirect Effect of Nitride's Nucleophilicity. Chemistry 2016; 22:4743-7. [PMID: 26852715 DOI: 10.1002/chem.201600059] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2016] [Indexed: 11/10/2022]
Abstract
A DFT mechanistic exploration of the reactivity of the dinitrogen hafnocene complex, [{(η(5)-C5 H2 -1,2,4-Me3)2 Hf}2 (μ2-N2)], towards mixtures of CO/CO2 and CO/OCNtBu is reported. The crucial role of the nitride intermediate is highlighted, as well as the importance of the bridging mode of the cyanate ligand between the two Hf metal atoms throughout the process. Interestingly, the CO2 addition to the nitride intermediate occurs through an outer-sphere transition state, whereas the addition of the heteroallene is governed by the steric congestion imposed by cyclopentadienyl ligands.
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Affiliation(s)
- Christos E Kefalidis
- LPCNO (Laboratoire de Physique et Chimie des Nano-objets), INSA (Institut National des Sciences Appliquées), CNRS (Centre National de la Recherche Scientifique), UPS (Université Paul Sabatier), Université de Toulouse, 135 Avenue de Rangueil, 31077, Toulouse, France.
| | - Laurent Maron
- LPCNO (Laboratoire de Physique et Chimie des Nano-objets), INSA (Institut National des Sciences Appliquées), CNRS (Centre National de la Recherche Scientifique), UPS (Université Paul Sabatier), Université de Toulouse, 135 Avenue de Rangueil, 31077, Toulouse, France.
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Monot J, Brunel P, Kefalidis CE, Espinosa-Jalapa NÁ, Maron L, Martin-Vaca B, Bourissou D. A case study of proton shuttling in palladium catalysis. Chem Sci 2016; 7:2179-2187. [PMID: 29899945 PMCID: PMC5968755 DOI: 10.1039/c5sc04232a] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2015] [Accepted: 12/04/2015] [Indexed: 01/19/2023] Open
Abstract
Thanks to mechanistic studies, the catalytic performance of SCS indenediide Pd pincer complexes has been spectacularly enhanced using catechol additives as proton shuttles.
The mechanism of alkynoic acid cycloisomerization with SCS indenediide Pd pincer complexes has been investigated experimentally and computationally. These studies confirmed the cooperation between the Pd center and the backbone of the pincer ligand, and revealed the involvement of a second molecule of substrate. It acts as a proton shuttle in the activation of the acid, it directs the nucleophilic attack of the carboxylic acid on the π-coordinated alkyne and it relays the protonolysis of the resulting vinyl Pd species. A variety of H-bond donors have been evaluated as external additives, and polyols featuring proximal hydroxyl groups, in particular catechol derivatives, led to significant catalytic enhancement. The impact of 4-nitrocatechol and 1,2,3-benzenetriol is particularly striking on challenging substrates such as internal 4- and 5-alkynoic acids. Endo/exo selectivities up to 7.3/1 and 60-fold increase in reactivity were achieved.
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Affiliation(s)
- Julien Monot
- Université de Toulouse , UPS , 118 route de Narbonne , F-31062 Toulouse , France.,CNRS , LHFA UMR5069 , F-31062 Toulouse , France . ;
| | - Paul Brunel
- Université de Toulouse , UPS , 118 route de Narbonne , F-31062 Toulouse , France.,CNRS , LHFA UMR5069 , F-31062 Toulouse , France . ;
| | - Christos E Kefalidis
- Université de Toulouse , INSA , UPS , LCPNO , CNRS , UMR 5215 CNRS-UPS-INSA , 135 avenue de Rangueil , 31400 Toulouse , France .
| | - Noel Ángel Espinosa-Jalapa
- Université de Toulouse , UPS , 118 route de Narbonne , F-31062 Toulouse , France.,CNRS , LHFA UMR5069 , F-31062 Toulouse , France . ;
| | - Laurent Maron
- Université de Toulouse , INSA , UPS , LCPNO , CNRS , UMR 5215 CNRS-UPS-INSA , 135 avenue de Rangueil , 31400 Toulouse , France .
| | - Blanca Martin-Vaca
- Université de Toulouse , UPS , 118 route de Narbonne , F-31062 Toulouse , France.,CNRS , LHFA UMR5069 , F-31062 Toulouse , France . ;
| | - Didier Bourissou
- Université de Toulouse , UPS , 118 route de Narbonne , F-31062 Toulouse , France.,CNRS , LHFA UMR5069 , F-31062 Toulouse , France . ;
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15
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Affiliation(s)
- Rami J. Batrice
- Schulich
Faculty of Chemistry, Technion − Israel Institute of Technology, Technion City, 3200008, Israel
| | - Christos E. Kefalidis
- LPCNO, CNRS, & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse, 31077, France
| | - Laurent Maron
- LPCNO, CNRS, & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse, 31077, France
| | - Moris S. Eisen
- Schulich
Faculty of Chemistry, Technion − Israel Institute of Technology, Technion City, 3200008, Israel
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16
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Kefalidis CE, Castro L, Perrin L, Rosal ID, Maron L. New perspectives in organolanthanide chemistry from redox to bond metathesis: insights from theory. Chem Soc Rev 2016; 45:2516-43. [DOI: 10.1039/c5cs00907c] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
A fifteen year contribution of computational studies carried out in close synergy with experiments is summarized.
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17
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Dawkins MJC, Middleton E, Kefalidis CE, Dange D, Juckel MM, Maron L, Jones C. Two-coordinate terminal zinc hydride complexes: synthesis, structure and preliminary reactivity studies. Chem Commun (Camb) 2016; 52:10490-2. [DOI: 10.1039/c6cc05445e] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
The first examples of essentially two-coordinate, monomeric zinc hydride complexes have been stabilised by incorporation of “super bulky” amide ligands. Crystallographic studies show them to possess near linear N–Zn–H fragments (see picture).
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Affiliation(s)
| | - Ewart Middleton
- Monash Centre for Catalysis
- School of Chemistry
- Monash University
- Australia
| | | | - Deepak Dange
- Monash Centre for Catalysis
- School of Chemistry
- Monash University
- Australia
| | - Martin M. Juckel
- Monash Centre for Catalysis
- School of Chemistry
- Monash University
- Australia
| | | | - Cameron Jones
- Monash Centre for Catalysis
- School of Chemistry
- Monash University
- Australia
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18
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Kefalidis CE, Perrin L, Burns CJ, Berg DJ, Maron L, Andersen RA. Can a pentamethylcyclopentadienyl ligand act as a proton-relay in f-element chemistry? Insights from a joint experimental/theoretical study. Dalton Trans 2015; 44:2575-87. [PMID: 25340677 DOI: 10.1039/c4dt02387k] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Isomerisation of buta-1,2-diene to but-2-yne by (Me(5)C(5))(2)Yb is a thermodynamically favourable reaction, with the Δ(r)G° estimated from experimental data at 298 K to be -3.0 kcal mol(-1). It proceeds in hydrocarbon solvents with a pseudo first-order rate constant of 6.4 × 10(-6) s(-1) and 7.4 × 10(-5) s(-1) in C(6)D(12) and C(6)D(6), respectively, at 20 °C. This 1,3-hydrogen shift is formally forbidden by symmetry and has to occur by an alternative pathway. The proposed mechanism for buta-1,2-diene to but-2-yne isomerisation by (Me(5)C(5))(2)Yb involves coordination of methylallene (buta-1,2-diene) to (Me(5)C(5))(2)Yb, and deprotonation of methylallene by one of the Me(5)C(5) ligands followed by protonation of the terminal methylallenyl carbon to yield the known coordination compound (Me(5)C(5))(2)Yb(η(2)-MeC[triple bond, length as m-dash]CMe). Computationally, this mechanism is not initiated by a single electron transfer step, and the ytterbium retains its oxidation state (II) throughout the reactivity. Experimentally, the influence of the metal centre is discussed by comparison with the reaction of (Me(5)C(5))(2)Ca towards buta-1,2-diene, and (Me(5)C(5))(2)Yb with ethylene. The mechanism by which the Me(5)C(5) acts as a proton-relay within the coordination sphere of a metal also rationalises the reactivity of (i) (Me(5)C(5))(2)Eu(OEt(2)) with phenylacetylene, (ii) (Me(5)C(5))(2)Yb(OEt(2)) with phenylphosphine and (iii) (Me(5)C(5))(2)U(NPh)(2) with H(2) to yield (Me(5)C(5))(2)U(HNPh)(2). In the latter case, the computed mechanism is the heterolytic activation of H(2) by (Me(5)C(5))(2)U(NPh)(2) to yield (Me(5)C(5))(2)U(H)(HNPh)(NPh), followed by a hydrogen transfer from uranium back to the imido nitrogen atom using one Me(5)C(5) ligand as a proton-relay. The overall mechanism by which hydrogen shifts using a pentamethylcyclopentadienyl ligand as a proton-relay is named Carambole in reference to carom billiards.
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Affiliation(s)
- Christos E Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse 31077, France.
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19
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Lalrempuia R, Kefalidis CE, Bonyhady SJ, Schwarze B, Maron L, Stasch A, Jones C. Activation of CO by Hydrogenated Magnesium(I) Dimers: Sterically Controlled Formation of Ethenediolate and Cyclopropanetriolate Complexes. J Am Chem Soc 2015; 137:8944-7. [DOI: 10.1021/jacs.5b06439] [Citation(s) in RCA: 94] [Impact Index Per Article: 10.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ralte Lalrempuia
- School
of Chemistry, Monash University, PO Box 23, Melbourne, Victoria 3800, Australia
| | - Christos E. Kefalidis
- Université de Toulouse et CNRS, INSA, UPS, UMR 5215, LPCNO, 135 Avenue de Rangueil, F-31077 Toulouse, France
| | - Simon J. Bonyhady
- School
of Chemistry, Monash University, PO Box 23, Melbourne, Victoria 3800, Australia
| | - Benedikt Schwarze
- School
of Chemistry, Monash University, PO Box 23, Melbourne, Victoria 3800, Australia
| | - Laurent Maron
- Université de Toulouse et CNRS, INSA, UPS, UMR 5215, LPCNO, 135 Avenue de Rangueil, F-31077 Toulouse, France
| | - Andreas Stasch
- School
of Chemistry, Monash University, PO Box 23, Melbourne, Victoria 3800, Australia
| | - Cameron Jones
- School
of Chemistry, Monash University, PO Box 23, Melbourne, Victoria 3800, Australia
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20
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Hicks J, Underhill EJ, Kefalidis CE, Maron L, Jones C. A Mixed-Valence Tri-Zinc Complex, [LZnZnZnL] (L=Bulky Amide), Bearing a Linear Chain of Two-Coordinate Zinc Atoms. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201504818] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Hicks J, Underhill EJ, Kefalidis CE, Maron L, Jones C. A Mixed‐Valence Tri‐Zinc Complex, [LZnZnZnL] (L=Bulky Amide), Bearing a Linear Chain of Two‐Coordinate Zinc Atoms. Angew Chem Int Ed Engl 2015; 54:10000-4. [DOI: 10.1002/anie.201504818] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Indexed: 11/12/2022]
Affiliation(s)
- Jamie Hicks
- School of Chemistry, Monash University, PO Box 23, Melbourne, VIC, 3800 (Australia) http://monash.edu/science/jonesgroup
| | - Emma J. Underhill
- School of Chemistry, Monash University, PO Box 23, Melbourne, VIC, 3800 (Australia) http://monash.edu/science/jonesgroup
| | - Christos E. Kefalidis
- Université de Toulouse et CNRS, INSA, UPS, UMR 5215, LPCNO, 135 Avenue de Rangueil, 31077 Toulouse (France)
| | - Laurent Maron
- Université de Toulouse et CNRS, INSA, UPS, UMR 5215, LPCNO, 135 Avenue de Rangueil, 31077 Toulouse (France)
| | - Cameron Jones
- School of Chemistry, Monash University, PO Box 23, Melbourne, VIC, 3800 (Australia) http://monash.edu/science/jonesgroup
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22
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Paparo A, Silvia JS, Kefalidis CE, Spaniol TP, Maron L, Okuda J, Cummins CC. A Dimetalloxycarbene Bonding Mode and Reductive Coupling Mechanism for Oxalate Formation from CO2. Angew Chem Int Ed Engl 2015; 54:9115-9. [PMID: 26110967 DOI: 10.1002/anie.201502532] [Citation(s) in RCA: 64] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Indexed: 02/03/2023]
Abstract
We describe the stable and isolable dimetalloxycarbene [(TiX3 )2 (μ2 -CO2 -κ(2) C,O:κO')] 5, where X=N-(tert-butyl)-3,5-dimethylanilide, which is stabilized by fluctuating μ2 -κ(2) C,O:κ(1) O' coordination of the carbene carbon to both titanium centers of the dinuclear complex 5, as shown by variable-temperature NMR studies. Quantum chemical calculations on the unmodified molecule indicated a higher energy of only +10.5 kJ mol(-1) for the μ2 -κ(1) O:κ(1) O' bonding mode of the free dimetalloxycarbene compared to the μ2 -κ(2) C,O:κ(1) O' bonding mode of the masked dimetalloxycarbene. The parent cationic bridging formate complex [(TiX3 )2 (μ2 -OCHO-κO:κO')][B(C6 F5)4], 4[B(C6 F5)4], was simply deprotonated with the strong base K(N(SiMe3 )2 ) to give 5. Complex 5 reacts smoothly with CO2 to generate the bridging oxalate complex [(TiX3 )2 (μ2 -C2 O4 -κO:κO'')], 6, in a C-C bond formation reaction commonly anticipated for oxalate formation by reductive coupling of CO2 on low-valent transition-metal complexes.
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Affiliation(s)
- Albert Paparo
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen (Germany)
| | - Jared S Silvia
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139 (USA)
| | - Christos E Kefalidis
- Université de Toulouse et CNRS, INSA, UPS, CNRS; UMR 5215 LPCNO, 135 Avenue de Rangueil, 31077 Toulouse (France)
| | - Thomas P Spaniol
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen (Germany)
| | - Laurent Maron
- Université de Toulouse et CNRS, INSA, UPS, CNRS; UMR 5215 LPCNO, 135 Avenue de Rangueil, 31077 Toulouse (France).
| | - Jun Okuda
- Institute of Inorganic Chemistry, RWTH Aachen University, Landoltweg 1, 52056 Aachen (Germany).
| | - Christopher C Cummins
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave, Cambridge, MA 02139 (USA).
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23
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Paparo A, Silvia JS, Kefalidis CE, Spaniol TP, Maron L, Okuda J, Cummins CC. Ein Dimetalloxycarben-Bindungsmodus und der reduktive Kupplungsmechanismus zur Bildung von Oxalat ausgehend von CO2. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502532] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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24
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Camp C, Chatelain L, Kefalidis CE, Pécaut J, Maron L, Mazzanti M. CO2 conversion to isocyanate via multiple N–Si bond cleavage at a bulky uranium(iii) complex. Chem Commun (Camb) 2015; 51:15454-7. [DOI: 10.1039/c5cc06707c] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
CO2 fixation by a bulky uranium(iii) tetrasilylamido complex leads to CO2 insertion into the U–N bond affording a U(iv) isocyanate.
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Affiliation(s)
- Clément Camp
- Univ. Grenoble Alpes
- INAC-SCIB
- F-38000 Grenoble
- France
- CEA
| | | | | | | | - Laurent Maron
- LPCNO
- CNRS & INSA
- UPS
- Université de Toulouse
- F-31077 Toulouse
| | - Marinella Mazzanti
- Institut des Sciences et Ingénierie Chimiques
- Ecole Polytechnique Fédérale de Lausanne (EPFL)
- CH-1015 Lausanne
- Switzerland
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25
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Wang L, Kefalidis CE, Roisnel T, Sinbandhit S, Maron L, Carpentier JF, Sarazin Y. Structure vs 119Sn NMR Chemical Shift in Three-Coordinated Tin(II) Complexes: Experimental Data and Predictive DFT Computations. Organometallics 2014. [DOI: 10.1021/om5007566] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lingfang Wang
- Institut
des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, Campus de Beaulieu, 35042 Rennes
Cedex, France
| | - Christos E. Kefalidis
- Laboratoire
de Physique et Chimie de Nano-objets, UMR 5215 CNRS−Université de Toulouse, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Thierry Roisnel
- Institut
des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, Campus de Beaulieu, 35042 Rennes
Cedex, France
| | - Sourisak Sinbandhit
- Centre
Régional des Mesures Physiques de l’Ouest, Université de Rennes 1, 35042 Rennes Cedex, France
| | - Laurent Maron
- Laboratoire
de Physique et Chimie de Nano-objets, UMR 5215 CNRS−Université de Toulouse, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Jean-François Carpentier
- Institut
des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, Campus de Beaulieu, 35042 Rennes
Cedex, France
| | - Yann Sarazin
- Institut
des Sciences Chimiques de Rennes, UMR 6226 CNRS−Université de Rennes 1, Campus de Beaulieu, 35042 Rennes
Cedex, France
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26
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Kefalidis CE, Stasch A, Jones C, Maron L. On the mechanism of the reaction of a magnesium(I) complex with CO₂: a concerted type of pathway. Chem Commun (Camb) 2014; 50:12318-21. [PMID: 25182965 DOI: 10.1039/c4cc04984e] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Theoretical mechanistic calculations (DFT) on the reactivity of [{((Dip)Nacnac)Mg}2] ((Dip)Nacnac = [(DipNCMe)2CH](-), Dip = C6H3(i)Pr2-2,6) towards CO2 were carried out in order to rationalise the experimental formation of a carbonate (major product) and an oxalate (minor product). Despite its apparent similarity to f-element reactivity, the magnesium(I) bimetallic complex yields the carbonate through a concerted type of pathway rather than via a transient oxo-bridged intermediate. The latter is destabilised due to the electrostatic repulsion between the two magnesium centres. The small energy barrier difference between carbonate and oxalate formation (~10 kcal mol(-1)) may allow for the experimentally observed reactivity to be tuned by changing the sterics and/or electronic properties of the magnesium(I) complex.
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Affiliation(s)
- Christos E Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse 31077, France.
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27
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Cleaves PA, King DM, Kefalidis CE, Maron L, Tuna F, McInnes EJL, McMaster J, Lewis W, Blake AJ, Liddle ST. Two-electron reductive carbonylation of terminal uranium(V) and uranium(VI) nitrides to cyanate by carbon monoxide. Angew Chem Int Ed Engl 2014; 53:10412-5. [PMID: 25079093 PMCID: PMC4497608 DOI: 10.1002/anie.201406203] [Citation(s) in RCA: 82] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/13/2014] [Indexed: 11/10/2022]
Abstract
Two-electron reductive carbonylation of the uranium(VI) nitride [U(Tren(TIPS))(N)] (2, Tren(TIPS)=N(CH2CH2NSiiPr3)3) with CO gave the uranium(IV) cyanate [U(Tren(TIPS))(NCO)] (3). KC8 reduction of 3 resulted in cyanate dissociation to give [U(Tren(TIPS))] (4) and KNCO, or cyanate retention in [U(Tren(TIPS))(NCO)][K(B15C5)2] (5, B15C5=benzo-15-crown-5 ether) with B15C5. Complexes 5 and 4 and KNCO were also prepared from CO and the uranium(V) nitride [{U(Tren(TIPS))(N)K}2] (6), with or without B15C5, respectively. Complex 5 can be prepared directly from CO and [U(Tren(TIPS))(N)][K(B15C5)2] (7). Notably, 7 reacts with CO much faster than 2. This unprecedented f-block reactivity was modeled theoretically, revealing nucleophilic attack of the π* orbital of CO by the nitride with activation energy barriers of 24.7 and 11.3 kcal mol(-1) for uranium(VI) and uranium(V), respectively. A remarkably simple two-step, two-electron cycle for the conversion of azide to nitride to cyanate using 4, NaN3 and CO is presented.
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Affiliation(s)
- Peter A Cleaves
- School of Chemistry, University of Nottingham, University ParkNottingham, NG7 2RD (UK)
| | - David M King
- School of Chemistry, University of Nottingham, University ParkNottingham, NG7 2RD (UK)
| | - Christos E Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier135 Avenue de Rangueil, 31077 Toulouse (France)
| | - Laurent Maron
- LPCNO, CNRS & INSA, Université Paul Sabatier135 Avenue de Rangueil, 31077 Toulouse (France)
| | - Floriana Tuna
- School of Chemistry and Photon Science Institute, University of ManchesterOxford Road, Manchester, M13 9PL (UK)
| | - Eric J L McInnes
- School of Chemistry and Photon Science Institute, University of ManchesterOxford Road, Manchester, M13 9PL (UK)
| | - Jonathan McMaster
- School of Chemistry, University of Nottingham, University ParkNottingham, NG7 2RD (UK)
| | - William Lewis
- School of Chemistry, University of Nottingham, University ParkNottingham, NG7 2RD (UK)
| | - Alexander J Blake
- School of Chemistry, University of Nottingham, University ParkNottingham, NG7 2RD (UK)
| | - Stephen T Liddle
- School of Chemistry, University of Nottingham, University ParkNottingham, NG7 2RD (UK)
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28
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Kefalidis CE, Davi M, Holstein PM, Clot E, Baudoin O. Mechanistic Study of the Selectivity of Olefin versus Cyclobutene Formation by Palladium(0)-Catalyzed Intramolecular C(sp3)–H Activation. J Org Chem 2014; 79:11903-10. [DOI: 10.1021/jo501610x] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Christos E. Kefalidis
- Institut
Charles Gerhardt, CNRS UMR 5253, Université Montpellier 2, case courrier
1501, Place Eugène Bataillon, 34095 Montpellier, France
| | - Michaël Davi
- Université Claude Bernard Lyon 1, CNRS UMR 5246 - Institut
de Chimie et Biochimie Moléculaires et Supramoléculaires,
CPE Lyon, 43 Boulevard
du 11 Novembre 1918, 69622 Villeurbanne, France
| | - Philipp M. Holstein
- Université Claude Bernard Lyon 1, CNRS UMR 5246 - Institut
de Chimie et Biochimie Moléculaires et Supramoléculaires,
CPE Lyon, 43 Boulevard
du 11 Novembre 1918, 69622 Villeurbanne, France
| | - Eric Clot
- Institut
Charles Gerhardt, CNRS UMR 5253, Université Montpellier 2, case courrier
1501, Place Eugène Bataillon, 34095 Montpellier, France
| | - Olivier Baudoin
- Université Claude Bernard Lyon 1, CNRS UMR 5246 - Institut
de Chimie et Biochimie Moléculaires et Supramoléculaires,
CPE Lyon, 43 Boulevard
du 11 Novembre 1918, 69622 Villeurbanne, France
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29
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Schmidt AC, Heinemann FW, Kefalidis CE, Maron L, Roesky PW, Meyer K. Activation of SO2 and CO2 by trivalent uranium leading to sulfite/dithionite and carbonate/oxalate complexes. Chemistry 2014; 20:13501-6. [PMID: 25146340 DOI: 10.1002/chem.201404400] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2014] [Indexed: 11/11/2022]
Abstract
The first sulfite [{(((nP,Me) ArO)3 tacn)U(IV) }2 (μ-κ(1) :κ(2) -SO3 )] (tacn=triazacyclononane) and dithionite [{(((nP,Me) ArO)3 tacn)U(IV) }2 (μ-κ(2) :κ(2) -S2 O4 )] complexes of uranium from reaction with gaseous SO2 have been prepared. Additionally, the reductive activation of CO2 was investigated with respect to the rare oxalate [{(((nP,Me) ArO)3 tacn)U(IV) }2 (μ-κ(2) :κ(2) -C2 O4 )] formation. This ultimately provides the unique S2 O4 (2-) /C2 O4 (2-) and SO3 (2-) /CO3 (2-) complex pairs. All new complexes were characterized by a combination of single-crystal X-ray diffraction, elemental analysis, UV/Vis/NIR electronic absorption, IR vibrational, and (1) H NMR spectroscopy, as well as magnetization (VT SQUID) studies. Moreover, density functional theory (DFT) calculations were carried out to gain further insight into the reaction mechanisms. All observations, together with DFT, support the assumption that SO2 and CO2 show similar (dithionite/oxalate) to analogous (sulfite/carbonate) activation behavior with uranium complexes.
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Affiliation(s)
- Anna-Corina Schmidt
- Friedrich-Alexander University Erlangen-Nürnberg (FAU), Department of Chemistry and Pharmacy, Inorganic Chemistry, Egerlandstrasse 1, 91058 Erlangen (Germany) http://www.inorganic-chemistry.net
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30
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Cleaves PA, King DM, Kefalidis CE, Maron L, Tuna F, McInnes EJL, McMaster J, Lewis W, Blake AJ, Liddle ST. Two-Electron Reductive Carbonylation of Terminal Uranium(V) and Uranium(VI) Nitrides to Cyanate by Carbon Monoxide. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201406203] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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31
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Chu J, Han X, Kefalidis CE, Zhou J, Maron L, Leng X, Chen Y. Lewis Acid Triggered Reactivity of a Lewis Base Stabilized Scandium-Terminal Imido Complex: C–H Bond Activation, Cycloaddition, and Dehydrofluorination. J Am Chem Soc 2014; 136:10894-7. [DOI: 10.1021/ja5061559] [Citation(s) in RCA: 54] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jiaxiang Chu
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
| | - Xianghao Han
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
| | - Christos E. Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Jiliang Zhou
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
| | - Laurent Maron
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Xuebing Leng
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
| | - Yaofeng Chen
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, P. R. China
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32
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Cooper O, Camp C, Pécaut J, Kefalidis CE, Maron L, Gambarelli S, Mazzanti M. Multimetallic Cooperativity in Uranium-Mediated CO2 Activation. J Am Chem Soc 2014; 136:6716-23. [DOI: 10.1021/ja5017624] [Citation(s) in RCA: 101] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Oliver Cooper
- Service
de Chimie Inorganique et Biologique (SCIB), Institut Nanosciences
et Cryogénie (INAC), CEA, F-38054 Grenoble, France
| | - Clément Camp
- Service
de Chimie Inorganique et Biologique (SCIB), Institut Nanosciences
et Cryogénie (INAC), CEA, F-38054 Grenoble, France
| | - Jacques Pécaut
- Service
de Chimie Inorganique et Biologique (SCIB), Institut Nanosciences
et Cryogénie (INAC), CEA, F-38054 Grenoble, France
| | - Christos E. Kefalidis
- Laboratoire
de Physique et Chimie des Nano-Objets (LPCNO), Université Toulouse III Paul Sabatier (UPS), Université de Toulouse, CNRS, Institut National des Sciences Appliquées (INSA), 135 Avenue de
Rangueil, F-31077 Toulouse, France
| | - Laurent Maron
- Laboratoire
de Physique et Chimie des Nano-Objets (LPCNO), Université Toulouse III Paul Sabatier (UPS), Université de Toulouse, CNRS, Institut National des Sciences Appliquées (INSA), 135 Avenue de
Rangueil, F-31077 Toulouse, France
| | - Serge Gambarelli
- Service
de Chimie Inorganique et Biologique (SCIB), Institut Nanosciences
et Cryogénie (INAC), CEA, F-38054 Grenoble, France
| | - Marinella Mazzanti
- Service
de Chimie Inorganique et Biologique (SCIB), Institut Nanosciences
et Cryogénie (INAC), CEA, F-38054 Grenoble, France
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33
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Kefalidis CE, Essafi S, Perrin L, Maron L. Qualitative Estimation of the Single-Electron Transfer Step Energetics Mediated by Samarium(II) Complexes: A “SOMO–LUMO Gap” Approach. Inorg Chem 2014; 53:3427-33. [DOI: 10.1021/ic402837n] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Christos E. Kefalidis
- Université de Toulouse et CNRS, INSA, UPS, CNRS,
UMR 5215, LPCNO, 135 Avenue
de Rangueil, F-31077 Toulouse, France
| | - Stéphanie Essafi
- School of Chemistry and
Centre for Computational Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Lionel Perrin
- Université de Toulouse et CNRS, INSA, UPS, CNRS,
UMR 5215, LPCNO, 135 Avenue
de Rangueil, F-31077 Toulouse, France
| | - Laurent Maron
- Université de Toulouse et CNRS, INSA, UPS, CNRS,
UMR 5215, LPCNO, 135 Avenue
de Rangueil, F-31077 Toulouse, France
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34
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Crozet D, Kefalidis CE, Urrutigoïty M, Maron L, Kalck P. Hydroaminomethylation of Styrene Catalyzed by Rhodium Complexes Containing Chiral Diphosphine Ligands and Mechanistic Studies: Why Is There a Lack of Asymmetric Induction? ACS Catal 2014. [DOI: 10.1021/cs400906b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Delphine Crozet
- CNRS, Laboratoire de Chimie de Coordination, composante
ENSIACET, 4 allée Emile Monso, BP 44362, 31030 Toulouse, Cedex 4, France
- Université de Toulouse UPS-INPT, F-31030 Toulouse, Cedex 4, France
| | - Christos E. Kefalidis
- LPCNO, UMR 5215, Université de Toulouse-CNRS, INSA, UPS
135 avenue de Rangueil, 31077 Toulouse Cedex 4, France
| | - Martine Urrutigoïty
- CNRS, Laboratoire de Chimie de Coordination, composante
ENSIACET, 4 allée Emile Monso, BP 44362, 31030 Toulouse, Cedex 4, France
- Université de Toulouse UPS-INPT, F-31030 Toulouse, Cedex 4, France
| | - Laurent Maron
- LPCNO, UMR 5215, Université de Toulouse-CNRS, INSA, UPS
135 avenue de Rangueil, 31077 Toulouse Cedex 4, France
| | - Philippe Kalck
- CNRS, Laboratoire de Chimie de Coordination, composante
ENSIACET, 4 allée Emile Monso, BP 44362, 31030 Toulouse, Cedex 4, France
- Université de Toulouse UPS-INPT, F-31030 Toulouse, Cedex 4, France
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35
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Castro L, Kefalidis CE, McKay D, Essafi S, Perrin L, Maron L. Theoretical treatment of one electron redox transformation of a small molecule using f-element complexes. Dalton Trans 2014; 43:12124-34. [DOI: 10.1039/c4dt01002g] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
DFT calculations can provide useful insights into low-valent f-element single electron transfer reactivity.
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Affiliation(s)
| | | | - David McKay
- Institute of Chemical Sciences
- School of Engineering and Physical Sciences
- Heriot-Watt University
- Edinburgh, UK
| | - Stéphanie Essafi
- School of Chemistry and Centre for Computational Chemistry
- University of Bristol
- Bristol BS8 1TS, UK
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36
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Kefalidis CE, Frey ASP, Roe SM, Cloke FGN, Maron L. Formation of cyanates in low-valent uranium chemistry: a synergistic experimental/theoretical study. Dalton Trans 2014; 43:11202-8. [DOI: 10.1039/c4dt00618f] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cyanate formation appears to occur at a monometallic species but is also shown to induce possible formation of a mix-valence complex.
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Affiliation(s)
| | - Alistair S. P. Frey
- Department of Chemistry
- School of Life Sciences
- University of Sussex
- Brighton, UK
| | - S. Mark Roe
- Department of Chemistry
- School of Life Sciences
- University of Sussex
- Brighton, UK
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37
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Gardner BM, Cleaves PA, Kefalidis CE, Fang J, Maron L, Lewis W, Blake AJ, Liddle ST. The role of 5f-orbital participation in unexpected inversion of the σ-bond metathesis reactivity trend of triamidoamine thorium(iv) and uranium(iv) alkyls. Chem Sci 2014. [DOI: 10.1039/c4sc00182f] [Citation(s) in RCA: 79] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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38
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Kefalidis CE, Perrin L, Maron L. Computational insights into carbon–carbon homocoupling reactions mediated by organolanthanide(iii) complexes. Dalton Trans 2014; 43:4520-9. [DOI: 10.1039/c3dt52937a] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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39
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Joost M, Gualco P, Coppel Y, Miqueu K, Kefalidis CE, Maron L, Amgoune A, Bourissou D. Direct Evidence for Intermolecular Oxidative Addition of σ(SiSi) Bonds to Gold. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307613] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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40
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Joost M, Gualco P, Coppel Y, Miqueu K, Kefalidis CE, Maron L, Amgoune A, Bourissou D. Direct Evidence for Intermolecular Oxidative Addition of σ(SiSi) Bonds to Gold. Angew Chem Int Ed Engl 2013; 53:747-51. [DOI: 10.1002/anie.201307613] [Citation(s) in RCA: 48] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2013] [Revised: 10/23/2013] [Indexed: 11/06/2022]
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41
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El-Hellani A, Kefalidis CE, Tham FS, Maron L, Lavallo V. Structure and Bonding of a Zwitterionic Iridium Complex Supported by a Phosphine with the Parent Carba-closo-dodecaborate CB11H11– Ligand Substituent. Organometallics 2013. [DOI: 10.1021/om401001p] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Ahmad El-Hellani
- Department of Chemistry, University of California Riverside, Riverside, California 92521, United States
| | - Christos E. Kefalidis
- Department of Chemistry CNRS & INSA, UPS, LPCNO, Université de Toulouse 135 Avenue de Rangueil, F-31077, Toulouse France
| | - Fook S. Tham
- Department of Chemistry, University of California Riverside, Riverside, California 92521, United States
| | - Laurent Maron
- Department of Chemistry CNRS & INSA, UPS, LPCNO, Université de Toulouse 135 Avenue de Rangueil, F-31077, Toulouse France
| | - Vincent Lavallo
- Department of Chemistry, University of California Riverside, Riverside, California 92521, United States
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42
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Camp C, Kefalidis CE, Pécaut J, Maron L, Mazzanti M. Controlled Thermolysis of Uranium (Alkoxy)siloxy Complexes: A Route to Polymetallic Complexes of Low-Valent Uranium. Angew Chem Int Ed Engl 2013; 52:12646-50. [DOI: 10.1002/anie.201307291] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2013] [Revised: 09/12/2013] [Indexed: 11/10/2022]
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43
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Camp C, Kefalidis CE, Pécaut J, Maron L, Mazzanti M. Controlled Thermolysis of Uranium (Alkoxy)siloxy Complexes: A Route to Polymetallic Complexes of Low-Valent Uranium. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307291] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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44
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Lv Y, Kefalidis CE, Zhou J, Maron L, Leng X, Chen Y. Versatile Reactivity of a Four-Coordinate Scandium Phosphinidene Complex: Reduction, Addition, and CO Activation Reactions. J Am Chem Soc 2013; 135:14784-96. [DOI: 10.1021/ja406413d] [Citation(s) in RCA: 66] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yingdong Lv
- State Key Laboratory
of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
| | - Christos E. Kefalidis
- LPCNO,
CNRS, and
INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse 31077, France
| | - Jiliang Zhou
- State Key Laboratory
of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
| | - Laurent Maron
- LPCNO,
CNRS, and
INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse 31077, France
| | - Xuebing Leng
- State Key Laboratory
of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
| | - Yaofeng Chen
- State Key Laboratory
of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032, People’s Republic of China
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45
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Asay M, Kefalidis CE, Estrada J, Weinberger DS, Wright J, Moore CE, Rheingold AL, Maron L, Lavallo V. Isolation of a Carborane-Fused Triazole Radical Anion. Angew Chem Int Ed Engl 2013; 52:11560-3. [DOI: 10.1002/anie.201306764] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2013] [Indexed: 11/10/2022]
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46
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Asay M, Kefalidis CE, Estrada J, Weinberger DS, Wright J, Moore CE, Rheingold AL, Maron L, Lavallo V. Isolation of a Carborane-Fused Triazole Radical Anion. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201306764] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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47
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Wang L, Kefalidis CE, Sinbandhit S, Dorcet V, Carpentier JF, Maron L, Sarazin Y. Heteroleptic tin(II) initiators for the ring-opening (co)polymerization of lactide and trimethylene carbonate: mechanistic insights from experiments and computations. Chemistry 2013; 19:13463-78. [PMID: 23955851 DOI: 10.1002/chem.201301751] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2013] [Indexed: 11/10/2022]
Abstract
The tin(II) complexes {LO(x)}Sn(X) ({LO(x)}(-) =aminophenolate ancillary) containing amido (1-4), chloro (5), or lactyl (6) coligands (X) promote the ring-opening polymerization (ROP) of cyclic esters. Complex 6, which models the first insertion of L-lactide, initiates the living ROP of L-LA on its own, but the amido derivatives 1-4 require the addition of alcohol to do so. Upon addition of one to ten equivalents of iPrOH, precatalysts 1-4 promote the ROP of trimethylene carbonate (TMC); yet, hardly any activity is observed if tert-butyl (R)-lactate is used instead of iPrOH. Strong inhibition of the reactivity of TMC is also detected for the simultaneous copolymerization of L-LA and TMC, or for the block copolymerization of TMC after that of L-LA. Experimental and computational data for the {LO(x)}Sn(OR)complexes (OR=lactyl or lactidyl) replicating the active species during the tin(II)-mediated ROP of L-LA demonstrate that the formation of a five-membered chelate is largely favored over that of an eight-membered one, and that it constitutes the resting state of the catalyst during this (co)polymerization. Comprehensive DFT calculations show that, out of the four possible monomer insertion sequences during simultaneous copolymerization of L-LA and TMC: 1) TMC then TMC, 2) TMC then L-LA, 3) L-LA then L-LA, and 4) L-LA then TMC, the first three are possible. By contrast, insertion of L-LA followed by that of TMC (i.e., insertion sequence 4) is endothermic by +1.1 kcal mol(-1), which compares unfavorably with consecutive insertions of two L-LA units (i.e., insertion sequence 3) (-10.2 kcal mol(-1)). The copolymerization of L-LA and TMC thus proceeds under thermodynamic control.
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Affiliation(s)
- Lingfang Wang
- Organometallics: Materials and Catalysis, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS-Université de Rennes 1, Campus de Beaulieu, 35042 Rennes Cedex (France)
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48
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Kefalidis CE, Perrin L, Maron L. Preliminary Theoretical Insights into SmI2-Mediated Reactions: Activation of Ketones in THF. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300288] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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49
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Affiliation(s)
- Jiaxiang Chu
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032,
People’s Republic of China
| | - Christos E. Kefalidis
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse 31077, France
| | - Laurent Maron
- LPCNO, CNRS & INSA, Université Paul Sabatier, 135 Avenue de Rangueil, Toulouse 31077, France
| | - Xuebing Leng
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032,
People’s Republic of China
| | - Yaofeng Chen
- State Key Laboratory of Organometallic
Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai 200032,
People’s Republic of China
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50
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Wright JH, Kefalidis CE, Tham FS, Maron L, Lavallo V. Click-Like Reactions with the Inert HCB11Cl11– Anion Lead to Carborane-Fused Heterocycles with Unusual Aromatic Character. Inorg Chem 2013; 52:6223-9. [DOI: 10.1021/ic400786a] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- James H. Wright
- Department of Chemistry, University of California Riverside, Riverside, California 92521,
United States
| | - Christos E. Kefalidis
- Department of Chemistry, CNRS & INSA, UPS, LPCNO, Université de Toulouse, 135 Avenue de Rangueil, F-31077, Toulouse France
| | - Fook S. Tham
- Department of Chemistry, University of California Riverside, Riverside, California 92521,
United States
| | - Laurent Maron
- Department of Chemistry, CNRS & INSA, UPS, LPCNO, Université de Toulouse, 135 Avenue de Rangueil, F-31077, Toulouse France
| | - Vincent Lavallo
- Department of Chemistry, University of California Riverside, Riverside, California 92521,
United States
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