1
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Gao J, Ge Y, He C. X-type silyl ligands for transition-metal catalysis. Chem Soc Rev 2024; 53:4648-4673. [PMID: 38525837 DOI: 10.1039/d3cs00893b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/26/2024]
Abstract
Given the critical importance of novel ligand development for transition-metal (TM) catalysis, as well as the resurgence of the field of organosilicon chemistry and silyl ligands, to summarize the topic of X-type silyl ligands for TM catalysis is highly attractive and timely. This review particularly emphasizes the unique σ-donating characteristics and trans-effects of silyl ligands, highlighting their crucial roles in enhancing the reactivity and selectivity of various catalytic reactions, including small molecule activation, Kumada cross-coupling, hydrofunctionalization, C-H functionalization, and dehydrogenative Si-O coupling reactions. Additionally, future developments in this field are also provided, which would inspire new insights and applications in catalytic synthetic chemistry.
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Affiliation(s)
- Jihui Gao
- School of Chemistry and Chemical Engineering, Heilongjiang Provincial, Harbin Institute of Technology, Harbin, Heilongjiang 150080, China
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
| | - Yicong Ge
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
| | - Chuan He
- Shenzhen Grubbs Institute and Department of Chemistry, Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen, Guangdong 518055, China.
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2
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Tong WY, Su X, Sun P, Xu S, Qu S, Wang X. Understanding the Reaction Mechanism of Ni-Catalyzed Regio- and Enantioselective Hydroalkylation of Enamines: Chemoselectivity of (Bi-oxazoline)NiH. J Org Chem 2023; 88:15404-15413. [PMID: 37853516 DOI: 10.1021/acs.joc.3c01939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Abstract
This density functional theory study explores the detailed mechanism of nickel-catalyzed hydroalkylation of the C═C bond of N-Cbz-protected enamines (Cbz = benzyloxycarbonyl) with alkyl iodides to give chiral α-alkyl amines. The active catalyst (biOx)NiH, a chiral bioxazoline (biOx)-chelated Ni(I) hydride, exhibits chemoselectivity that favors single electron transfer to the alkyl iodide over C═C hydrometalation with the enamine. This generates an alkyl radical and a Ni(II) intermediate, which takes up the enamine substrate CbzNHCH═CH2CH3 via a regio- and enantioselective C═C insertion into the NiII-H bond. The resulting Ni(II) alkyl complex combines with the alkyl radical, forming a Ni(III) intermediate, from which the alkyl-alkyl reductive elimination delivers the chiral amine product. The regioselectivity arises from a combination of orbital and noncovalent interactions, both of which are induced by the Cbz group. Thus, Cbz plays an additional role in controlling regioselectivity. The enantioselectivity stems from the differing distortion energies of CbzNHCH═CH2CH3. The reductive elimination is the rate-determining step (ΔG⧧ = 18.7 kcal/mol). In addition, the calculations show a noninnocent behavior of the biOx ligand induced by the insertion of CbzNHCH═CH2CH3 into the Ni-H bond of (biOx)NiH. These computationally gained insights can have implications for developing new Ni(I)-catalyzed reactions.
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Affiliation(s)
- Wen-Yan Tong
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
- Department of Chemistry, Xi'an Jiaotong-Liverpool University, Suzhou 215123, China
| | - Xiaoxi Su
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Pengrui Sun
- Department of Chemistry, Xi'an Jiaotong-Liverpool University, Suzhou 215123, China
| | - Shaojie Xu
- Department of Chemistry, Xi'an Jiaotong-Liverpool University, Suzhou 215123, China
| | - Shuanglin Qu
- College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China
| | - Xiaotai Wang
- Department of Chemistry, Xi'an Jiaotong-Liverpool University, Suzhou 215123, China
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3
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Dawson G, Lin Q, Neary MC, Diao T. Ligand Redox Activity of Organonickel Radical Complexes Governed by the Geometry. J Am Chem Soc 2023; 145:20551-20561. [PMID: 37695362 PMCID: PMC10515493 DOI: 10.1021/jacs.3c07031] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2023] [Indexed: 09/12/2023]
Abstract
Nickel-catalyzed cross-coupling reactions often employ bidentate π-acceptor N-ligands to facilitate radical pathways. This report presents the synthesis and characterization of a series of organonickel radical complexes supported by bidentate N-ligands, including bpy, phen, and pyrox, which are commonly proposed and observed intermediates in catalytic reactions. Through a comparison of relevant analogues, we have established an empirical rule governing the electronic structures of these nickel radical complexes. The N-ligands exhibit redox activity in four-coordinate, square-planar nickel radical complexes, leading to the observation of ligand-centered radicals. In contrast, these ligands do not display redox activity when supporting three-coordinate, trigonal planar nickel radical complexes, which are better described as nickel-centered radicals. This trend holds true irrespective of the nature of the actor ligands. These results provide insights into the beneficial effect of coordinating salt additives and solvents in stabilizing nickel radical intermediates during catalytic reactions by modulating the redox activity of the ligands. Understanding the electronic structures of these active intermediates can contribute to the development and optimization of nickel catalysts for cross-coupling reactions.
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Affiliation(s)
- Gregory
A. Dawson
- Department
of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Qiao Lin
- Department
of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Michelle C. Neary
- Department
of Chemistry, CUNY − Hunter College, 695 Park Avenue, New York, New York 10065, United States
| | - Tianning Diao
- Department
of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
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4
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Schmitt M, Mayländer M, Heizmann T, Richert S, Bülow C, Hirsch K, Zamudio‐Bayer V, Lau JT, Krossing I. Isolation and Characterization of the Homoleptic Nickel(I) and Nickel(II) Bis‐benzene Sandwich Cations. Angew Chem Int Ed Engl 2022; 61:e202211555. [PMID: 36197000 PMCID: PMC10099793 DOI: 10.1002/anie.202211555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Indexed: 11/17/2022]
Abstract
A stable salt of the metalloradical [Ni(C6 H6 )2 ]+ hitherto unknown in the condensed phase was synthesized from [Ni(CO)4 ]+ [WCA]- and benzene ([WCA]- =[F{Al(ORF )3 }2 ]- ; RF =C(CF3 )3 ). Single crystal XRD reveals a remarkable asymmetrically η3 ,η6 -slipped sandwich structure. The magnetic properties of the [Ni(C6 H6 )2 ]+ cation were determined in solution and in the gas phase. Oxidation with the synergistic Ag+ /0.5 l2 system led to the salt [Ni(C6 H6 )2 ]2+ ([WCA]- )2 . All products were fully characterized by means of IR, Raman, NMR/EPR, single crystal and powder XRD.
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Affiliation(s)
- Manuel Schmitt
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF) Albert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg Germany
| | - Maximilian Mayländer
- Institut für Physikalische Chemie Albert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg Germany
| | - Tim Heizmann
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF) Albert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg Germany
| | - Sabine Richert
- Institut für Physikalische Chemie Albert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg Germany
| | - Christine Bülow
- Abteilung für Hochempfindliche Röntgenspektroskopie Helmholtz-Zentrum Berlin für Materialien und Energie Albert-Einstein-Straße 15 12489 Berlin Germany
- Physikalisches Institut Universität Freiburg Hermann-Herder-Straße 3 79104 Freiburg Germany
| | - Konstantin Hirsch
- Abteilung für Hochempfindliche Röntgenspektroskopie Helmholtz-Zentrum Berlin für Materialien und Energie Albert-Einstein-Straße 15 12489 Berlin Germany
| | - Vicente Zamudio‐Bayer
- Abteilung für Hochempfindliche Röntgenspektroskopie Helmholtz-Zentrum Berlin für Materialien und Energie Albert-Einstein-Straße 15 12489 Berlin Germany
| | - J. Tobias Lau
- Abteilung für Hochempfindliche Röntgenspektroskopie Helmholtz-Zentrum Berlin für Materialien und Energie Albert-Einstein-Straße 15 12489 Berlin Germany
- Physikalisches Institut Universität Freiburg Hermann-Herder-Straße 3 79104 Freiburg Germany
| | - Ingo Krossing
- Institut für Anorganische und Analytische Chemie and Freiburger Materialforschungszentrum (FMF) Albert-Ludwigs-Universität Freiburg Albertstr. 21 79104 Freiburg Germany
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5
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Zovko C, Krätschmer F, Schmidt S, Seifert TP, Gamer MT, Roesky PW. A Phosphine-ß-diketiminate Nickel(I)-Complex for Small Molecule Activation. Chempluschem 2022; 87:e202200288. [PMID: 36514880 DOI: 10.1002/cplu.202200288] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/24/2022] [Revised: 11/07/2022] [Indexed: 11/10/2022]
Abstract
A bis(diphenyl)-phosphine functionalized ß-diketimine ligand (PNac-H) was applied for the synthesis of a subvalent Ni(I) complex [PNac-Ni]. Here, the Ni(I) center is stabilized by a tetradentate PNNP-type pocket, forming a square planar coordination sphere. Subsequently, the Ni(I) complex was investigated with regard to its reactivity and the activation of small molecules. The reductive potential of Ni(I) enabled an activation of different substrate classes, such as CH2 X2 (X=Br, I), I2 or Ph2 E2 (E=S, Se). The ligand's design allows a stabilization of the reactive Ni(I) species while at the same time enabling activation processes due to a hemilabile coordination behavior and accessible axial coordination sites. The activation products have been characterized by single crystal X-ray diffraction, NMR and IR spectroscopy as well as elemental analysis.
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Affiliation(s)
- Christina Zovko
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131, Karlsruhe, Germany
| | - Frederic Krätschmer
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131, Karlsruhe, Germany
| | - Sarah Schmidt
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131, Karlsruhe, Germany
| | - Tim P Seifert
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131, Karlsruhe, Germany
| | - Michael T Gamer
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131, Karlsruhe, Germany
| | - Peter W Roesky
- Institute of Inorganic Chemistry, Karlsruhe Institute of Technology (KIT), Engesserstraße 15, 76131, Karlsruhe, Germany
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6
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Tendera L, Krummenacher I, Radius U. Cationic Nickel d9‐Metalloradicals [Ni(NHC)2]+. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Lukas Tendera
- Julius-Maximilians-Universität Würzburg: Julius-Maximilians-Universitat Wurzburg Anorganische Chemie GERMANY
| | - Ivo Krummenacher
- Julius-Maximilians-Universität Würzburg: Julius-Maximilians-Universitat Wurzburg Anorganische Chemie GERMANY
| | - Udo Radius
- Julius-Maximilians-Universität Würzburg: Julius-Maximilians-Universitat Wurzburg Institut für Anorganische Chemie Am Hubland 97074 Würzburg GERMANY
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7
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Affiliation(s)
- Ryan J. Witzke
- Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
| | - T. Don Tilley
- Department of Chemistry, University of California Berkeley, Berkeley, California 94720, United States
- Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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8
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Panigrahi D, Mondal M, Gupta R, Mani G. Four- and five-coordinate nickel(ii) complexes bearing new diphosphine–phosphonite and triphosphine–phosphite ligands: catalysts for N-alkylation of amines. RSC Adv 2022; 12:4510-4520. [PMID: 35425522 PMCID: PMC8981024 DOI: 10.1039/d1ra08961g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Accepted: 12/12/2021] [Indexed: 11/21/2022] Open
Abstract
A series of nickel(ii) complexes supported by the new tridentate P3 and tetradentate P4 ligands act efficiently as catalysts for the N-alkylation of primary amines with alcohols.
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Affiliation(s)
- Dipankar Panigrahi
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721 302, India
| | - Munmun Mondal
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721 302, India
| | - Rohit Gupta
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721 302, India
| | - Ganesan Mani
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur, 721 302, India
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9
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Posada-Pérez S, Escayola S, Poater J, Solà M, Poater A. Ni(I)-TPA Stabilization by Hydrogen Bond formation on the Second Coordination Sphere: a DFT Characterization. Dalton Trans 2022; 51:12585-12595. [DOI: 10.1039/d2dt01355j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ni(I) compounds are less common than those of either Ni(0) or Ni(II). Recently, a series of Ni(I) tris(2 pyridylmethyl)amine (TPA) complexes were synthetized through the reduction of Ni(II)-TPA complexes and...
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10
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Dodd NA, Bacsa J, Sadighi JP. Synthesis of a Nickel(I) alkoxide and related cation equivalents. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115408] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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11
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Matsubara K. Well-Defined NHC-Ni Complexes as Catalysts: Preparation, Structures and Mechanistic Studies in Cross-Coupling Reactions. CHEM REC 2021; 21:3925-3942. [PMID: 34596959 DOI: 10.1002/tcr.202100204] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2021] [Revised: 09/12/2021] [Indexed: 02/06/2023]
Abstract
Developmental studies are ongoing to discover a way to utilise new N-heterocyclic carbene (NHC)-Ni complexes as catalysts. Using a bulky NHC ligand, it is possible to synthesise an NHC/phosphine-mixed heteroleptic Ni(II) complex, which can serve as an excellent catalyst for various cross-coupling reactions. During the study of the reaction mechanisms using these Ni complexes, NHC-Ni(I) complexes were accidentally discovered, and it was observed that they exhibit excellent catalytic activity for cross-coupling reactions. The possibility of the presence of NHC-Ni(I) intermediates in these catalytic reaction pathways has been experimentally demonstrated. Depending on the type of reaction, dinuclear Ni(I) and mononuclear Ni(I) complexes can function as intermediates. The results of the investigation of each reaction mechanism are summarised, and the prospects are described.
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Affiliation(s)
- Kouki Matsubara
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka, 814-0180, Japan
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12
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Ar D, Kilpatrick AFR, Cula B, Herwig C, Limberg C. Transformation of Formazanate at Nickel(II) Centers to Give a Singly Reduced Nickel Complex with Azoiminate Radical Ligands and Its Reactivity toward Dioxygen. Inorg Chem 2021; 60:13844-13853. [PMID: 33770441 DOI: 10.1021/acs.inorgchem.0c03761] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The heteroleptic (formazanato)nickel bromide complex LNi(μ-Br)2NiL [LH = Mes-NH-N═C(p-tol)-N═N-Mes] has been prepared by deprotonation of LH with NaH followed by reaction with NiBr2(dme). Treatment of this complex with KC8 led to transformation of the formazanate into azoiminate ligands via N-N bond cleavage and the simultaneous release of aniline. At the same time, the potentially resulting intermediate complex L'2Ni [L' = HN═C(p-tol)-N═N-Mes] was reduced by one additional electron, which is delocalized across the π system and the metal center. The resulting reduced complex [L'2Ni]K(18-c-6) has a S = 1/2 ground state and a square-planar structure. It reacts with dioxygen via one-electron oxidation to give the complex L'2Ni, and the formation of superoxide was detected spectroscopically. If oxidizable substrates are present during this process, these are oxygenated/oxidized. Triphenylphosphine is converted to phosphine oxide, and hydrogen atoms are abstracted from TEMPO-H and phenols. In the case of cyclohexene, autoxidations are triggered, leading to the typical radical-chain-derived products of cyclohexene.
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Affiliation(s)
- Deniz Ar
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany
| | - Alexander F R Kilpatrick
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany
| | - Beatrice Cula
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany
| | - Christian Herwig
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany
| | - Christian Limberg
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor-Strasse 2, 12489 Berlin, Germany
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13
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Ju L, Lin Q, LiBretto NJ, Wagner CL, Hu CT, Miller JT, Diao T. Reactivity of (bi-Oxazoline)organonickel Complexes and Revision of a Catalytic Mechanism. J Am Chem Soc 2021; 143:14458-14463. [PMID: 34463481 DOI: 10.1021/jacs.1c07139] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Bi-Oxazoline (biOx) has emerged as an effective ligand framework for promoting nickel-catalyzed cross-coupling, cross-electrophile coupling, and photoredox-nickel dual catalytic reactions. This report fills the knowledge gap of the organometallic reactivity of (biOx)Ni complexes, including catalyst reduction, oxidative electrophile activation, radical capture, and reductive elimination. The biOx ligand displays no redox activity in (biOx)Ni(I) complexes, in contrast to other chelating imine and oxazoline ligands. The lack of ligand redox activity results in more negative reduction potentials of (biOx)Ni(II) complexes and accounts for the inability of zinc and manganese to reduce (biOx)Ni(II) species. On the basis of these results, we revise the formerly proposed "sequential reduction" mechanism of a (biOx)Ni-catalyzed cross-electrophile coupling reaction by excluding catalyst reduction steps.
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Affiliation(s)
- Luchuan Ju
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Qiao Lin
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Nicole J LiBretto
- Department of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47906, United States
| | - Clifton L Wagner
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Chunhua Tony Hu
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Jeffrey T Miller
- Department of Chemical Engineering, Purdue University, 480 Stadium Mall Drive, West Lafayette, Indiana 47906, United States
| | - Tianning Diao
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
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14
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Das A, Chakraborty S, Mandal SK. Abnormal N-heterocyclic Carbene Based Ni(II) π-allyl Complex towards Molecular Oxygen Activation. Chem Asian J 2021; 16:2257-2260. [PMID: 34137185 DOI: 10.1002/asia.202100568] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Revised: 06/15/2021] [Indexed: 11/08/2022]
Abstract
Abnormal N-heterocyclic carbene (aNHC) based Ni(II) π-allyl complexes (3 and 4) were synthesized starting from a Ni(0) precursor. These complexes were characterized by NMR spectroscopy, single-crystal X-ray crystallography (4) and elemental analysis data. The underlying mechanism for the formation of Ni(II) η3 -allyl complexes from a Ni(0) precursor on treatment with a free abnormal N-heterocyclic carbene in absence of any external additive or oxidant was unraveled. Later, complex 3 was exposed to O2 gas under ambient pressure resulting in molecular oxygen activation to form a μ-hydroxo bridged Ni(II) dimer.
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Affiliation(s)
- Arpan Das
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India
| | - Soumi Chakraborty
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India
| | - Swadhin K Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India
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15
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Multireversible Redox Processes in a Self‐Assembled Nickel Pentanuclear Bis(Triple‐stranded Helicate): Structural and Spectroscopic Characterizations in the Ni
II
5
and Ni
I
Ni
II
4
Redox States. ChemElectroChem 2021. [DOI: 10.1002/celc.202100895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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16
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Yu HC, Telser J, Mankad NP. Synthesis and Characterization of Heteromultinuclear Ni/M Clusters (M = Fe, Ru, W) Including a Paramagnetic (NHC)Ni–WCp*(CO)3 Heterobinuclear Complex. Organometallics 2021; 40:2123-2132. [DOI: 10.1021/acs.organomet.1c00263] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Hsien-Cheng Yu
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607, United States
| | - Joshua Telser
- Department of Biological, Physical and Health Sciences, Roosevelt University, Chicago, Illinois 60605, United States
| | - Neal P. Mankad
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607, United States
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17
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Wagner CL, Herrera G, Lin Q, Hu CT, Diao T. Redox Activity of Pyridine-Oxazoline Ligands in the Stabilization of Low-Valent Organonickel Radical Complexes. J Am Chem Soc 2021; 143:5295-5300. [DOI: 10.1021/jacs.1c00440] [Citation(s) in RCA: 25] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Clifton L. Wagner
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Gabriel Herrera
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Qiao Lin
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Chunhua T. Hu
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Tianning Diao
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
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18
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Ghosh AC, Duboc C, Gennari M. Synergy between metals for small molecule activation: Enzymes and bio-inspired complexes. Coord Chem Rev 2021. [DOI: 10.1016/j.ccr.2020.213606] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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19
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Zimmermann P, Kilpatrick AFR, Ar D, Demeshko S, Cula B, Limberg C. Electron transfer within β-diketiminato nickel bromide and cobaltocene redox couples activating CO 2. Chem Commun (Camb) 2021; 57:875-878. [PMID: 33393537 DOI: 10.1039/d0cc06983c] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Reduction of β-diketiminato nickel(ii) complexes (LtBuNiII) to the corresponding nickel(i) compounds does not require alkali metal compounds but can also be performed with the milder cobaltocenes. LtBuNiBr and Cp2Co have rather similar redox potentials, so that the equilibrium with the corresponding electron transfer compound [LtBuNiIBr][Cp2CoIII] (ETC) clearly lies on the side of the starting materials. Still, the ETC portion can be used to activate CO2 yielding a mononuclear nickel(ii) carbonate complex and ETC can be isolated almost quantitatively from the solutions through crystallisation. The more negative reduction potential of Cp*2Co shifts the equilibrium formed with LtBuNiBr strongly towards the ETC and accordingly the reaction of such solutions with CO2 is much faster.
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Affiliation(s)
- Philipp Zimmermann
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Alexander F R Kilpatrick
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Deniz Ar
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Serhiy Demeshko
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstr. 4, D-37077 Göttingen, Germany
| | - Beatrice Cula
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
| | - Christian Limberg
- Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, Germany.
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Abstract
A series of nickel(ii) tris(2-pyridylmethyl)amine (TPA) complexes featuring appended hydrogen bonds (H-bonds) to halides (F, Cl, Br) was synthesized and charcterized. Reduction to the nickel(i) state provided access to an unusual nickel(i) fluoride complex stabilized by H-bonds, enabling structural and spectroscopic characterization.
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Affiliation(s)
- Jessica R Wilson
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.
| | - Matthias Zeller
- H.C. Brown Laboratory, Department of Chemistry, Purdue University, West Lafayette, Indiana 47907, USA
| | - Nathaniel K Szymczak
- Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.
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21
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Duan P, Schulz RA, Römer A, Van Kuiken BE, Dechert S, Demeshko S, Cutsail GE, DeBeer S, Mata RA, Meyer F. Ligand Protonation Triggers H
2
Release from a Dinickel Dihydride Complex to Give a Doubly “T”‐Shaped Dinickel(I) Metallodiradical. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202011494] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Peng‐Cheng Duan
- Universität Göttingen Institut für Anorganische Chemie Tammannstrasse 4 37077 Göttingen Germany
- Center for Catalysis and Florida Center for Heterocyclic Compounds Department of Chemistry University of Florida Gainesville FL 32611-7200 USA
| | - Roland Alexander Schulz
- Universität Göttingen Institut für Anorganische Chemie Tammannstrasse 4 37077 Göttingen Germany
| | - Anton Römer
- Universität Göttingen Institut für Physikalische Chemie Tammannstrasse 6 37077 Göttingen Germany
| | - Benjamin E. Van Kuiken
- Max Planck Institute for Chemical Energy Conversion (MPI-CEC) Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
- European XFEL Holzkoppel 4 22869 Schenefeld Germany
| | - Sebastian Dechert
- Universität Göttingen Institut für Anorganische Chemie Tammannstrasse 4 37077 Göttingen Germany
| | - Serhiy Demeshko
- Universität Göttingen Institut für Anorganische Chemie Tammannstrasse 4 37077 Göttingen Germany
| | - George E. Cutsail
- Max Planck Institute for Chemical Energy Conversion (MPI-CEC) Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion (MPI-CEC) Stiftstrasse 34–36 45470 Mülheim an der Ruhr Germany
| | - Ricardo A. Mata
- Universität Göttingen Institut für Physikalische Chemie Tammannstrasse 6 37077 Göttingen Germany
| | - Franc Meyer
- Universität Göttingen Institut für Anorganische Chemie Tammannstrasse 4 37077 Göttingen Germany
- Universität Göttingen International Center for Advanced Studies of Energy Conversion (ICASEC) Tammannstrasse 6 37077 Göttingen Germany
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22
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Duan P, Schulz RA, Römer A, Van Kuiken BE, Dechert S, Demeshko S, Cutsail GE, DeBeer S, Mata RA, Meyer F. Ligand Protonation Triggers H 2 Release from a Dinickel Dihydride Complex to Give a Doubly "T"-Shaped Dinickel(I) Metallodiradical. Angew Chem Int Ed Engl 2021; 60:1891-1896. [PMID: 33026170 PMCID: PMC7894169 DOI: 10.1002/anie.202011494] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Indexed: 12/12/2022]
Abstract
The dinickel(II) dihydride complex (1K ) of a pyrazolate-based compartmental ligand with β-diketiminato (nacnac) chelate arms (L- ), providing two pincer-type {N3 } binding pockets, has been reported to readily eliminate H2 and to serve as a masked dinickel(I) species. Discrete dinickel(I) complexes (2Na , 2K ) of L- are now synthesized via a direct reduction route. They feature two adjacent T-shaped metalloradicals that are antiferromagnetically coupled, giving an S=0 ground state. The two singly occupied local d x 2 - y 2 type magnetic orbitals are oriented into the bimetallic cleft, enabling metal-metal cooperative 2 e- substrate reductions as shown by the rapid reaction with H2 or O2 . X-ray crystallography reveals distinctly different positions of the K+ in 1K and 2K , suggesting a stabilizing interaction of K+ with the dihydride unit in 1K . H2 release from 1K is triggered by peripheral γ-C protonation at the nacnac subunits, which DFT calculations show lowers the barrier for reductive H2 elimination from the bimetallic cleft.
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Affiliation(s)
- Peng‐Cheng Duan
- Universität GöttingenInstitut für Anorganische ChemieTammannstrasse 437077GöttingenGermany
- Center for Catalysis and Florida Center for Heterocyclic CompoundsDepartment of ChemistryUniversity of FloridaGainesvilleFL32611-7200USA
| | | | - Anton Römer
- Universität GöttingenInstitut für Physikalische ChemieTammannstrasse 637077GöttingenGermany
| | - Benjamin E. Van Kuiken
- Max Planck Institute for Chemical Energy Conversion (MPI-CEC)Stiftstrasse 34–3645470Mülheim an der RuhrGermany
- European XFELHolzkoppel 422869SchenefeldGermany
| | - Sebastian Dechert
- Universität GöttingenInstitut für Anorganische ChemieTammannstrasse 437077GöttingenGermany
| | - Serhiy Demeshko
- Universität GöttingenInstitut für Anorganische ChemieTammannstrasse 437077GöttingenGermany
| | - George E. Cutsail
- Max Planck Institute for Chemical Energy Conversion (MPI-CEC)Stiftstrasse 34–3645470Mülheim an der RuhrGermany
| | - Serena DeBeer
- Max Planck Institute for Chemical Energy Conversion (MPI-CEC)Stiftstrasse 34–3645470Mülheim an der RuhrGermany
| | - Ricardo A. Mata
- Universität GöttingenInstitut für Physikalische ChemieTammannstrasse 637077GöttingenGermany
| | - Franc Meyer
- Universität GöttingenInstitut für Anorganische ChemieTammannstrasse 437077GöttingenGermany
- Universität GöttingenInternational Center for Advanced Studies of Energy Conversion (ICASEC)Tammannstrasse 637077GöttingenGermany
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23
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Liang Y, Shi SH, Jin R, Qiu X, Wei J, Tan H, Jiang X, Shi X, Song S, Jiao N. Electrochemically induced nickel catalysis for oxygenation reactions with water. Nat Catal 2021. [DOI: 10.1038/s41929-020-00559-w] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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24
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Brandt A, RanguMagar AB, Szwedo P, Wayland HA, Parnell CM, Munshi P, Ghosh A. Highly economical and direct amination of sp 3 carbon using low-cost nickel pincer catalyst. RSC Adv 2021; 11:1862-1874. [PMID: 35424101 PMCID: PMC8693581 DOI: 10.1039/d0ra09639c] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2020] [Accepted: 12/07/2020] [Indexed: 11/21/2022] Open
Abstract
Developing more efficient routes to achieve C-N bond coupling is of great importance to industries ranging from products in pharmaceuticals and fertilizers to biomedical technologies and next-generation electroactive materials. Over the past decade, improvements in catalyst design have moved synthesis away from expensive metals to newer inexpensive C-N cross-coupling approaches via direct amine alkylation. For the first time, we report the use of an amide-based nickel pincer catalyst (1) for direct alkylation of amines via activation of sp3 C-H bonds. The reaction was accomplished using a 0.2 mol% catalyst and no additional activating agents other than the base. Upon optimization, it was determined that the ideal reaction conditions involved solvent dimethyl sulfoxide at 110 °C for 3 h. The catalyst demonstrated excellent reactivity in the formation of various imines, intramolecularly cyclized amines, and substituted amines with a turnover number (TON) as high as 183. Depending on the base used for the reaction and the starting amines, the catalyst demonstrated high selectivity towards the product formation. The exploration into the mechanism and kinetics of the reaction pathway suggested the C-H activation as the rate-limiting step, with the reaction second-order overall, holding first-order behavior towards the catalyst and toluene substrate.
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Affiliation(s)
- Andrew Brandt
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
| | - Ambar B RanguMagar
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
| | - Peter Szwedo
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
| | - Hunter A Wayland
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
| | - Charlette M Parnell
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
| | - Pradip Munshi
- Research Center, Reliance Industries Limited Vadodara Gujarat 391346 India +91 265 261 6066
| | - Anindya Ghosh
- Department of Chemistry, University of Arkansas at Little Rock 2801 South University Avenue Little Rock AR 72204 USA +1 501 569 8838 +1 501 569 8827
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25
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Matveeva R, Blasius CK, Wadepohl H, Gade LH. Reactivity of a T-shaped cobalt(I) pincer-complex. Dalton Trans 2021; 50:6802-6810. [PMID: 34032245 DOI: 10.1039/d1dt00277e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivity of a paramagnetic T-shaped cobalt(i) complex, [(iPrboxmi)Co], stabilised by a monoanionic bis(oxazolinylmethylidene)-isoindolate (boxmi) NNN pincer ligand is described. The exposure to carbon monoxide as an additional neutral ligand resulted in the square-planar species [(iPrboxmi)Co(CO)], accompanied by a change in the electronic spin state from S = 1 to S = 0. In contrast, upon treatment with trimethylphosphine the formation of the distorted tetrahedral complex [(iPrboxmi)Co(PMe3)] was observed (S = 1). Reacting [(iPrboxmi)Co] with iodine (I2), organic peroxides (tBu2O2, (SiMe3)2O2) and diphenyldisulphide (Ph2S2) yielded the tetracoordinated complexes [(iPrboxmi)CoI], [(iPrboxmi)Co(OtBu)], [(iPrboxmi)Co(OSiMe3)] and [(iPrboxmi)Co(SPh)], respectively, demonstrating the capability of the boxmi-supported cobalt(i) complex to homolytically cleave bonds and thus its distinct one-electron reactivity. Furthermore, a square-planar cobalt(ii) alkynyl complex [(iPrboxmi)Co(CCArF)] was identified as the main product in the reaction between [(iPrboxmi)Co] and a terminal alkyne, 4-fluoro-1-ethynylbenzene. Putting such species in the context of the previously investigated hydroboration catalysis, its stoichiometric reaction with pinacolborane revealed its potential conversion into a cobalt(ii) hydride complex, thus confirming its original attribution as off-cycle species.
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Affiliation(s)
- Regina Matveeva
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - Clemens K Blasius
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - Hubert Wadepohl
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
| | - Lutz H Gade
- Anorganisch-Chemisches Institut, Universität Heidelberg, Im Neuenheimer Feld 270, 69120 Heidelberg, Germany.
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26
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Chatterjee B, Chang W, Werlé C. Molecularly Controlled Catalysis – Targeting Synergies Between Local and Non‐local Environments. ChemCatChem 2020. [DOI: 10.1002/cctc.202001431] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Basujit Chatterjee
- Max Planck Institute for Chemical Energy Conversion Stiftstr. 34–36 45470 Mülheim an der Ruhr Germany
- Ruhr University Bochum Universitätsstr. 150 44801 Bochum Germany
| | - Wei‐Chieh Chang
- Max Planck Institute for Chemical Energy Conversion Stiftstr. 34–36 45470 Mülheim an der Ruhr Germany
- Ruhr University Bochum Universitätsstr. 150 44801 Bochum Germany
| | - Christophe Werlé
- Max Planck Institute for Chemical Energy Conversion Stiftstr. 34–36 45470 Mülheim an der Ruhr Germany
- Ruhr University Bochum Universitätsstr. 150 44801 Bochum Germany
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27
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Kothe T, Kim UH, Dechert S, Meyer F. Reductive Binding of Nitro Substrates at a Masked Dinickel(I) Complex and Proton-Coupled Conversion to Reduced Nitroso Ligands. Inorg Chem 2020; 59:14207-14217. [PMID: 32960575 DOI: 10.1021/acs.inorgchem.0c01993] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The transition-metal-mediated reductive activation of nitro compounds and subsequent proton-coupled N-O bond cleavage reactions are key steps of important processes such as the commercially relevant conversions of nitroaryls to aniline derivatives. Here we report the reactivity of selected nitro substrates RNO2 (R = Me, Ph, p-C6H4CHO) with pyrazolate-based dinickel(II) dihydride complexes [ML(NiH)2] (M = Na, K); the latter eliminate H2 upon substrate binding and serve as a masked dinickel(I) platform. The products [MLNi2(O2NR)] (R = Me, 3Me-M; R = Ph, 3Ph-M) host a μ-κO,κO' bridging twice deprotonated dihydroxy amine [RNO2]2- within the dinickel pocket, and structural analysis as well as NMR evidence show that the alkali cation (Na+ or K+) is closely associated with the reduced substrate. In the case of p-nitrobenzaldehyde, chemoselective reduction of the nitro group is observed to give 3Bna-K. The 3Me-M complexes in solution are unstable and show first order decay to a mixture of complexes [LNi2(μ-OH)] (4) and [LNi2(ON═CH2)] (5), with the latter containing a μ-κO,κN formaldoximato ligand. The decay rate of 3Me-M strongly depends on the alkali cation (k = 2.38 (±0.03) × 104 s-1 for 3Me-K and 4.69 (±0.06) × 10-6 s-1 for 3Me-Na), and a mechanistic scenario is proposed. Protonation of 3Ph-K induces disproportionation of the bound [PhNO2]2- to give free PhNO2, 4, and [LNi2(ON(H)Ph)] (2Ph-H) featuring an O-deprotonated μ-κO,κN hydroxylamine in the dinickel(II) cleft; abstraction of the cation K+ from 3Ph-K via addition of cryptand gives the analogous complex [LNi2(ONPh)][K(crypt)] (2Ph-K[crypt]) with a twice deprotonated hydroxylamine ligand. The results are discussed in light of the intermediates that are proposed to be relevant in the sequence of nitro group reduction and protonation steps, as implicated in the conversion of nitroaryls to anilines.
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Affiliation(s)
- Thomas Kothe
- Institut für Anorganische Chemie, Universität Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
| | - U-Hyun Kim
- Institut für Anorganische Chemie, Universität Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
| | - Sebastian Dechert
- Institut für Anorganische Chemie, Universität Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
| | - Franc Meyer
- Institut für Anorganische Chemie, Universität Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
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28
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Pei C, Zong J, Han S, Li B, Wang B. Ni-Catalyzed Direct Carboxylation of an Unactivated C-H Bond with CO 2. Org Lett 2020; 22:6897-6902. [PMID: 32812433 DOI: 10.1021/acs.orglett.0c02429] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The transition-metal-catalyzed direct carboxylation of an unactivated C-H bond is rarely reported, and no example of catalysis using abundant and cheap nickel has been reported. In this work, the first Ni-catalyzed direct carboxylation of an unactivated C-H bond under an atmospheric pressure of CO2 is reported. This method affords moderate to high carboxylation yields of various methyl carboxylates under mild conditions. Preliminary mechanistic studies reveal that a Ni(0)-Ni(II)-Ni(I) catalytic cycle may be involved in this reaction.
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Affiliation(s)
- Chunzhe Pei
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Jiarui Zong
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Shanglin Han
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Bin Li
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Baiquan Wang
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China.,State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, People's Republic of China
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29
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Stevens H, Duan PC, Dechert S, Meyer F. Competing H 2 versus Intramolecular C-H Activation at a Dinuclear Nickel Complex via Metal-Metal Cooperative Oxidative Addition. J Am Chem Soc 2020; 142:6717-6728. [PMID: 32163715 DOI: 10.1021/jacs.0c00758] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Nickel(I) metalloradicals bear great potential for the reductive activation of challenging substrates but are often too unstable to be isolated. Similar chemistry may be enabled by nickel(II) hydrides that store the reducing equivalents in hydride bonds and reductively eliminate H2 upon substrate binding. Here we present a pyrazolate-based bis(β-diketiminato) ligand [LPh]3- with bulky m-terphenyl substituents that can host two Ni-H units in close proximity. Complexes [LPh(NiII-H)2]- (3) are prone to intramolecular reductive H2 elimination, and an equilibrium between 3 and orthometalated dinickel(II) monohydride complexes 2 is evidenced. 2 is shown to form via intramolecular metal-metal cooperative phenyl group C(sp2)-H oxidative addition to the dinickel(I) intermediate [LPhNiI2]- (4). While NiI species have been implicated in catalytic C-H functionalization, discrete activation of C-H bonds at NiI complexes has rarely been described. The reversible H2 and C-H reductive elimination/oxidative addition equilibrium smoothly unmasks the powerful 2-electron reductant 4 from either 2 or 3, which is demonstrated by reaction with benzaldehyde. A dramatic cation effect is observed for the rate of interconversion of 2 and 3 and also for subsequent thermally driven formation of a twice orthometalated dinickel(II) complex 6. X-ray crystallographic and NMR titration studies indicate distinct interaction of the Lewis acidic cation with 2 and 3. The present system allows for the unmasking of a highly reactive [LPhNiI2]- intermediate 4 either via elimination of H2 from dihydride 3 or via reductive C-H elimination from monohydride 2. The latter does not release any H2 byproduct and adds a distinct platform for metal-metal cooperative two-electron substrate reductions while circumventing the isolation of any unstable superreduced form of the bimetallic scaffold.
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Affiliation(s)
- Hendrik Stevens
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Peng-Cheng Duan
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Sebastian Dechert
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, Germany
| | - Franc Meyer
- Universität Göttingen, Institut für Anorganische Chemie, Tammannstrasse 4, D-37077 Göttingen, Germany
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30
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Li XB, Xin ZK, Xia SG, Gao XY, Tung CH, Wu LZ. Semiconductor nanocrystals for small molecule activation via artificial photosynthesis. Chem Soc Rev 2020; 49:9028-9056. [DOI: 10.1039/d0cs00930j] [Citation(s) in RCA: 69] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The protocol of artificial photosynthesis using semiconductor nanocrystals shines light on green, facile and low-cost small molecule activation to produce solar fuels and value-added chemicals.
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Affiliation(s)
- Xu-Bing Li
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Zhi-Kun Xin
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Shu-Guang Xia
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Xiao-Ya Gao
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Chen-Ho Tung
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
| | - Li-Zhu Wu
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials
- Technical Institute of Physics and Chemistry
- Chinese Academy of Sciences
- Beijing 100190
- P. R. China
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31
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Alkane and alkene oxidation reactions catalyzed by nickel(II) complexes: Effect of ligand factors. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2019.213085] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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32
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Bonding and electronic structures in dinuclear (X)[(Ind)M2L2] complexes (M = Ni, Pd, L = CO, PEt3, X = Cl, Allyl, Ind = indenyl, Cp = cyclopentadienyl): analogy between four-electron donor ligands. Theor Chem Acc 2019. [DOI: 10.1007/s00214-019-2526-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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33
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Astakhov AV, Soliev SB, Gordeev EG, Chernyshev VM, Ananikov VP. Relative stabilities of M/NHC complexes (M = Ni, Pd, Pt) against R-NHC, X-NHC and X-X couplings in M(0)/M(ii) and M(ii)/M(iv) catalytic cycles: a theoretical study. Dalton Trans 2019; 48:17052-17062. [PMID: 31696883 DOI: 10.1039/c9dt03266e] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The complexes of Ni, Pd, and Pt with N-heterocyclic carbenes (NHCs) catalyze numerous organic reactions via proposed typical M0/MII catalytic cycles comprising intermediates with the metal center in (0) and (II) oxidation states. In addition, MII/MIV catalytic cycles have been proposed for a number of reactions. The catalytic intermediates in both cycles can suffer decomposition via R-NHC coupling and the side reductive elimination of the NHC ligand and R groups (R = alkyl, aryl, etc.) to give [NHC-R]+ cations. In this study, the relative stabilities of (NHC)MII(R)(X)L and (NHC)MIV(R)(X)3L intermediates (X = Cl, Br, I; L = NHC, pyridine) against R-NHC coupling and other decomposition pathways via reductive elimination reactions were evaluated theoretically. The study revealed that the R-NHC coupling represents the most favorable decomposition pathway for both types of intermediates (MII and MIV), while it is thermodynamically and kinetically more facile for the MIV complexes. The relative effects of the metal M (Ni, Pd, Pt) and ligands L and X on the R-NHC coupling for the MIV complexes were significantly stronger than that for the MII complexes. In particular, for the (NHC)2MIV(Ph)(Br)3 complexes, Ph-NHC coupling was facilitated dramatically from Pt (ΔG = -36.9 kcal mol-1, ΔG≠ = 37.5 kcal mol-1) to Pd (ΔG = -61.5 kcal mol-1, ΔG≠ = 18.3 kcal mol-1) and Ni (ΔG = -80.2 kcal mol-1, ΔG≠ = 4.7 kcal mol-1). For the MII oxidation state of the metal, the bis-NHC complexes (L = NHC) were slightly more kinetically and thermodynamically stable against R-NHC coupling than the mono-NHC complexes (L = pyridine). An inverse relation was observed for the MIV oxidation state of the metal as the (NHC)2MIV(R)(X)3 complexes were kinetically (4.3-15.9 kcal mol-1) and thermodynamically (8.0-23.2 kcal mol-1) significantly less stable than the (NHC)MIV(R)(X)3L (L = pyridine) complexes. For the NiIV and PdIV complexes, additional decomposition pathways via the reductive elimination of the NHC and X ligands to give the [NHC-X]+ cation (X-NHC coupling) or reductive elimination of the X-X molecule were found to be thermodynamically and kinetically probable. Overall, the obtained results demonstrate significant instability of regular Ni/NHC and Pd/NHC complexes (for example, not additionally stabilized by chelation) and high probability to initiate "NHC-free" catalysis in the reactions comprising MIV intermediates.
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Affiliation(s)
- Alexander V Astakhov
- Platov South-Russian State Polytechnic University (NPI), Prosveschenya 132, Novocherkassk, 346428, Russia. and Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
| | - Safarmurod B Soliev
- Platov South-Russian State Polytechnic University (NPI), Prosveschenya 132, Novocherkassk, 346428, Russia.
| | - Evgeniy G Gordeev
- Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
| | - Victor M Chernyshev
- Platov South-Russian State Polytechnic University (NPI), Prosveschenya 132, Novocherkassk, 346428, Russia. and Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
| | - Valentine P Ananikov
- Platov South-Russian State Polytechnic University (NPI), Prosveschenya 132, Novocherkassk, 346428, Russia. and Zelinsky Institute of Organic Chemistry, Russian Academy of Sciences, Leninsky Prospect 47, Moscow, 119991, Russia
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34
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Abstract
The first Ni-catalyzed tandem synthesis of 2-substituted benzo[b]furans/furo-pyridines from 2-halophenols and 1-alkynes was explored under Cu-free and phosphine-free conditions. The protocol was carried out with NiCl2/5-nitro-1, 10-phenanthroline in DMA (N,N-dimethylacetamide) at 120 °C. It was found to be simple, cost effective, and have a wide substrate scope. Additionally, the method is compatible with heteroaryl substrates, resulting in the formation of 2-substituted benzo[b]furans/furo-pyridines in reasonable to good yields.
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35
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Lapointe S, Khaskin E, Fayzullin RR, Khusnutdinova JR. Nickel(II) Complexes with Electron-Rich, Sterically Hindered PNP Pincer Ligands Enable Uncommon Modes of Ligand Dearomatization. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00558] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Affiliation(s)
- Sébastien Lapointe
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - Eugene Khaskin
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - Robert R. Fayzullin
- Arbuzov Institute of Organic and Physical Chemistry, FCR Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Street, Kazan 420088, Russian Federation
| | - Julia R. Khusnutdinova
- Coordination Chemistry and Catalysis Unit, Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
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36
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Greis K, Yang Y, Canty AJ, O'Hair RAJ. Gas-Phase Synthesis and Reactivity of Ligated Group 10 Ions in the Formal +1 Oxidation State. JOURNAL OF THE AMERICAN SOCIETY FOR MASS SPECTROMETRY 2019; 30:1867-1880. [PMID: 31183840 DOI: 10.1007/s13361-019-02231-5] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 04/14/2019] [Accepted: 04/16/2019] [Indexed: 06/09/2023]
Abstract
Electrospray ionization of the group 10 complexes [(phen)M(O2CCH3)2] (phen=1,10-phenanthroline, M = Ni, Pd, Pt) generates the cations [(phen)M(O2CCH3)]+, whose gas-phase chemistry was studied using multistage mass spectrometry experiments in an ion trap mass spectrometer with the combination of collision-induced dissociation (CID) and ion-molecule reactions (IMR). Decarboxylation of [(phen)M(O2CCH3)]+ under CID conditions generates the organometallic cations [(phen)M(CH3)]+, which undergo bond homolysis upon a further stage of CID to generate the cations [(phen)M]+· in which the metal center is formally in the +1 oxidation state. In the case of [(phen)Pt(CH3)]+, the major product ion [(phen)H]+ was formed via loss of the metal carbene Pt=CH2. DFT calculated energetics for the competition between bond homolysis and M=CH2 loss are consistent with their experimentally observed branching ratios of 2% and 98% respectively. The IMR of [(phen)M]+· with O2, N2, H2O, acetone, and allyl iodide were examined. Adduct formation occurs for O2, N2, H2O, and acetone. Upon CID, all adducts fragment to regenerate [(phen)M]+·, except for [(phen)Pt(OC(CH3)2)]+·, which loses a methyl radical to form [(phen)Pt(OCCH3)]+ which upon a further stage of CID regenerates [(phen)Pt(CH3)]+ via CO loss. This closes a formal catalytic cycle for the decomposition of acetone into CO and two methyl radicals with [(phen)Pt]+· as catalyst. In the IMR of [(phen)M]+· with allyl iodide, formation of [(phen)M(CH2CHCH2)]+ was observed for all three metals, whereas for M = Pt also [(phen)Pt(I)]+ and [(phen)Pt(I)2(CH2CHCH2)]+ were observed. Finally, DFT calculated reaction energetics for all IMR reaction channels are consistent with the experimental observations.
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Affiliation(s)
- Kim Greis
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, 3010, Australia
- Institut für Chemie, Humboldt-Universität zu Berlin, Brook-Taylor Straße 2, 12489, Berlin, Germany
- Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195, Berlin, Germany
| | - Yang Yang
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, 3010, Australia
| | - Allan J Canty
- School of Natural Sciences - Chemistry, University of Tasmania, Private Bag 75, Hobart, Tasmania, 7001, Australia
| | - Richard A J O'Hair
- School of Chemistry and Bio21 Molecular Science and Biotechnology Institute, The University of Melbourne, Parkville, Victoria, 3010, Australia.
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37
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Diccianni JB, Hu CT, Diao T. Insertion of CO
2
Mediated by a (Xantphos)Ni
I
–Alkyl Species. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201906005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Justin B. Diccianni
- Chemistry Department New York University 100 Washington Square East New York NY 10003 USA
| | - Chunhua T. Hu
- Chemistry Department New York University 100 Washington Square East New York NY 10003 USA
| | - Tianning Diao
- Chemistry Department New York University 100 Washington Square East New York NY 10003 USA
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38
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Diccianni JB, Hu CT, Diao T. Insertion of CO 2 Mediated by a (Xantphos)Ni I -Alkyl Species. Angew Chem Int Ed Engl 2019; 58:13865-13868. [PMID: 31309669 DOI: 10.1002/anie.201906005] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2019] [Revised: 06/21/2019] [Indexed: 12/14/2022]
Abstract
The incorporation of CO2 into organometallic and organic molecules represents a sustainable way to prepare carboxylates. The mechanism of reductive carboxylation of alkyl halides has been proposed to proceed through the reduction of NiII to NiI by either Zn or Mn, followed by CO2 insertion into NiI -alkyl species. No experimental evidence has been previously established to support the two proposed steps. Demonstrated herein is that the direct reduction of (tBu-Xantphos)NiII Br2 by Zn affords NiI species. (tBu-Xantphos)NiI -Me and (tBu-Xantphos)NiI -Et complexes undergo fast insertion of CO2 at 22 °C. The substantially faster rate, relative to that of NiII complexes, serves as the long-sought-after experimental support for the proposed mechanisms of Ni-catalyzed carboxylation reactions.
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Affiliation(s)
- Justin B Diccianni
- Chemistry Department, New York University, 100 Washington Square East, New York, NY, 10003, USA
| | - Chunhua T Hu
- Chemistry Department, New York University, 100 Washington Square East, New York, NY, 10003, USA
| | - Tianning Diao
- Chemistry Department, New York University, 100 Washington Square East, New York, NY, 10003, USA
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39
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Singh V, Sakaki S, Deshmukh MM. Theoretical prediction of Ni(I)-catalyst for hydrosilylation of pyridine and quinoline. J Comput Chem 2019; 40:2119-2130. [PMID: 31184780 DOI: 10.1002/jcc.25864] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2019] [Revised: 04/26/2019] [Accepted: 05/02/2019] [Indexed: 12/14/2022]
Abstract
Catalytic synthesis of dihydropyridine by transition-metal complex is one of the important research targets, recently. Density functional theory calculations here demonstrate that nickel(I) hydride complex (bpy)NiI H (bpy = 2,2'-bipyridine) 1 is a good catalyst for hydrosilylation of both quinoline and pyridine. Two pathways are possible; in path 1, substrate reacts with 1 to form stable intermediate Int1. After that, N3 ─C1 bond of substrate inserts into Ni─H bond of 1 via TS1 to afford N-coordinated 1,2-dihydroquinoline Int2 with the Gibbs activation energy (ΔG°‡ ) of 21.8 kcal mol-1 . Then, Int2 reacts with hydrosilane to form hydrosilane σ-complex Int3; this is named path 1A. In the other route (path 1B), Int1 reacts with phenylsilane in a concerted manner via hydride-shuttle transition state TS2 to afford Int3. In TS2, Si atom takes hypervalent trigonal bipyramidal structure. Formation of hypervalent structure is crucial for stabilization of TS2 (ΔG°‡ = 17.3 kcal mol-1 ). The final step of path 1 is metathesis between Ni─N3 bond of Int3 and Si─H bond of PhSiH3 to afford N-silylated 1,2-dihydroproduct and regenerate 1 (ΔG°‡ = 4.5 kcal mol-1 ). In path 2, 1 reacts with hydrosilane to form Int5, which then forms adduct Int6 with substrate through Si-N interaction between substrate and PhSiH3 . Then, N-silylated 1,2-dihydroproduct is produced via hydride-shuttle transition state TS5 (ΔG°‡ = 18.8 kcal mol-1 ). The absence of N-coordination of substrate to NiI in TS5 is the reason why path 2 is less favorable than path 1B. Quinoline hydrosilylation occurs more easily than pyridine because quinoline has the lowest unoccupied molecular orbital at lower energy than that of pyridine. © 2019 Wiley Periodicals, Inc.
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Affiliation(s)
- Vijay Singh
- Department of Chemistry, Dr. Harisingh Gour Vishwavidyalaya (A Central University), Sagar, 470003, India
| | - Shigeyoshi Sakaki
- Fukui Institute for Fundamental Chemistry, Kyoto University, Nishihiraki-cho, Takano, Sakyo-ku, Kyoto, 606-8103, Japan
| | - Milind M Deshmukh
- Department of Chemistry, Dr. Harisingh Gour Vishwavidyalaya (A Central University), Sagar, 470003, India
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40
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Matsubara K, Fujii T, Hosokawa R, Inatomi T, Yamada Y, Koga Y. Fluorine-Substituted Arylphosphine for an NHC-Ni(I) System, Air-Stable in a Solid State but Catalytically Active in Solution. Molecules 2019; 24:molecules24183222. [PMID: 31487944 PMCID: PMC6766797 DOI: 10.3390/molecules24183222] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 09/02/2019] [Accepted: 09/03/2019] [Indexed: 11/16/2022] Open
Abstract
Monovalent NHC-nickel complexes bearing triarylphosphine, in which fluorine is incorporated onto the aryl groups, have been synthesized. Tris(3,5-di(trifluoromethyl)-phenyl)phosphine efficiently gave a monovalent nickel bromide complex, whose structure was determined by X-ray diffraction analysis for the first time. In the solid state, the Ni(I) complex was less susceptible to oxidation in air than the triphenylphosphine complex, indicating greatly improved solid-state stability. In contrast, the Ni(I) complex in solution can easily liberate the phosphine, high catalytic activity toward the Kumada–Tamao–Corriu coupling of aryl bromides.
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Affiliation(s)
- Kouki Matsubara
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan.
| | - Takahiro Fujii
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan.
| | - Rion Hosokawa
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan.
| | - Takahiro Inatomi
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan
| | - Yuji Yamada
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan
| | - Yuji Koga
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan
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41
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Pietrzak T, Justyniak I, Kubisiak M, Bojarski E, Lewiński J. An In‐Depth Look at the Reactivity of Non‐Redox‐Metal Alkylperoxides. Angew Chem Int Ed Engl 2019; 58:8526-8530. [DOI: 10.1002/anie.201904380] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Indexed: 01/07/2023]
Affiliation(s)
- Tomasz Pietrzak
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Iwona Justyniak
- Institute of Physical ChemistryPolish Academy of Science Kasprzaka 44/52 01-224 Warsaw Poland
| | - Marcin Kubisiak
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Emil Bojarski
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Janusz Lewiński
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
- Institute of Physical ChemistryPolish Academy of Science Kasprzaka 44/52 01-224 Warsaw Poland
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42
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Pietrzak T, Justyniak I, Kubisiak M, Bojarski E, Lewiński J. An In‐Depth Look at the Reactivity of Non‐Redox‐Metal Alkylperoxides. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201904380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tomasz Pietrzak
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Iwona Justyniak
- Institute of Physical ChemistryPolish Academy of Science Kasprzaka 44/52 01-224 Warsaw Poland
| | - Marcin Kubisiak
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Emil Bojarski
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
| | - Janusz Lewiński
- Faculty of ChemistryWarsaw University of Technology Noakowskiego 3 00-664 Warsaw Poland
- Institute of Physical ChemistryPolish Academy of Science Kasprzaka 44/52 01-224 Warsaw Poland
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43
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Ferretti E, Dechert S, Meyer F. Reductive Binding and Ligand-Based Redox Transformations of Nitrosobenzene at a Dinickel(II) Core. Inorg Chem 2019; 58:5154-5162. [DOI: 10.1021/acs.inorgchem.9b00256] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eleonora Ferretti
- Institut für Anorganische Chemie, Universität Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
| | - Sebastian Dechert
- Institut für Anorganische Chemie, Universität Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
| | - Franc Meyer
- Institut für Anorganische Chemie, Universität Göttingen, Tammanstrasse 4, D-37077 Göttingen, Germany
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44
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Desnoyer AN, He W, Behyan S, Chiu W, Love JA, Kennepohl P. The Importance of Ligand-Induced Backdonation in the Stabilization of Square Planar d 10 Nickel π-Complexes. Chemistry 2019; 25:5259-5268. [PMID: 30693581 DOI: 10.1002/chem.201805987] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2018] [Indexed: 01/06/2023]
Abstract
The electronic nature of Ni π-complexes is underexplored even though these complexes have been widely postulated as intermediates in organometallic chemistry. Herein, the geometric and electronic structure of a series of nickel π-complexes, Ni(dtbpe)(X) (dtbpe=1,2-bis(di-tert-butyl)phosphinoethane; X=alkene or carbonyl containing π-ligands), is probed using a combination of 31 P NMR, Ni K-edge XAS, Ni Kβ XES, and DFT calculations. These complexes are best described as square planar d10 complexes with π-backbonding acting as the dominant contributor to M-L bonding to the π-ligand. The degree of backbonding correlates with 2 JPP from NMR and the energy of the Ni 1s→4pz pre-edge in the Ni K-edge XAS data, and is determined by the energy of the π*ip ligand acceptor orbital. Thus, unactivated olefinic ligands tend to be poor π-acids whereas ketones, aldehydes, and esters allow for greater backbonding. However, backbonding is still significant even in cases in which metal contributions are minor. In such cases, backbonding is dominated by charge donation from the diphosphine, which allows for strong backdonation, although the metal centre retains a formal d10 electronic configuration. This ligand-induced backbonding can be formally described as a 3-centre-4-electron (3c-4e) interaction, in which the nickel centre mediates charge transfer from the phosphine σ-donors to the π*ip ligand acceptor orbital. The implications of this bonding motif are described with respect to both structure and reactivity.
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Affiliation(s)
- Addison N Desnoyer
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
| | - Weiying He
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
| | - Shirin Behyan
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
| | - Weiling Chiu
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
| | - Jennifer A Love
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
| | - Pierre Kennepohl
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, V6T 1Z1, Vancouver, BC, Canada
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45
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Lapointe S, Khaskin E, Fayzullin RR, Khusnutdinova JR. Stable Nickel(I) Complexes with Electron-Rich, Sterically-Hindered, Innocent PNP Pincer Ligands. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00026] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Sébastien Lapointe
- Okinawa Institute of Science and Technology Graduate University, Coordination Chemistry and Catalysis Unit, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - Eugene Khaskin
- Okinawa Institute of Science and Technology Graduate University, Coordination Chemistry and Catalysis Unit, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
| | - Robert R. Fayzullin
- Arbuzov Institute of Organic and Physical Chemistry, FCR Kazan Scientific Center, Russian Academy of Sciences, 8 Arbuzov Street, Kazan 420088, Russian Federation
| | - Julia R. Khusnutdinova
- Okinawa Institute of Science and Technology Graduate University, Coordination Chemistry and Catalysis Unit, 1919-1 Tancha, Onna-son, Okinawa 904-0495, Japan
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46
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Zarate C, Yang H, Bezdek MJ, Hesk D, Chirik PJ. Ni(I)–X Complexes Bearing a Bulky α-Diimine Ligand: Synthesis, Structure, and Superior Catalytic Performance in the Hydrogen Isotope Exchange in Pharmaceuticals. J Am Chem Soc 2019; 141:5034-5044. [DOI: 10.1021/jacs.9b00939] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Cayetana Zarate
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - Haifeng Yang
- MRL, Merck & Co, Inc., Rahway, New Jersey 07065, United States
| | - Máté J. Bezdek
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
| | - David Hesk
- MRL, Merck & Co, Inc., Rahway, New Jersey 07065, United States
| | - Paul J. Chirik
- Department of Chemistry, Princeton University, Princeton, New Jersey 08544, United States
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47
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Diccianni JB, Katigbak J, Hu C, Diao T. Mechanistic Characterization of (Xantphos)Ni(I)-Mediated Alkyl Bromide Activation: Oxidative Addition, Electron Transfer, or Halogen-Atom Abstraction. J Am Chem Soc 2019; 141:1788-1796. [DOI: 10.1021/jacs.8b13499] [Citation(s) in RCA: 87] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Justin B. Diccianni
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Joseph Katigbak
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Chunhua Hu
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
| | - Tianning Diao
- Department of Chemistry, New York University, 100 Washington Square East, New York, New York 10003, United States
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48
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Lian F, Xu K, Meng W, Zhang H, Tan Z, Zeng C. Nickel-catalyzed electrochemical reductive decarboxylative coupling of N-hydroxyphthalimide esters with quinoxalinones. Chem Commun (Camb) 2019; 55:14685-14688. [DOI: 10.1039/c9cc07840a] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The first example of electrochemically enabled, NiCl2-catalyzed reductive decarboxylative coupling of N-hydroxyphthalimide esters with quinoxalinones was developed.
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Affiliation(s)
- Fei Lian
- Beijing Key Laboratory of Environmental and Viral Oncology
- College of Life Science & Bioengineering
- Beijing University of Technology
- Beijing 100124
- China
| | - Kun Xu
- Beijing Key Laboratory of Environmental and Viral Oncology
- College of Life Science & Bioengineering
- Beijing University of Technology
- Beijing 100124
- China
| | - Wei Meng
- Beijing Key Laboratory of Environmental and Viral Oncology
- College of Life Science & Bioengineering
- Beijing University of Technology
- Beijing 100124
- China
| | - Haonan Zhang
- Beijing Key Laboratory of Environmental and Viral Oncology
- College of Life Science & Bioengineering
- Beijing University of Technology
- Beijing 100124
- China
| | - Zhoumei Tan
- Beijing Key Laboratory of Environmental and Viral Oncology
- College of Life Science & Bioengineering
- Beijing University of Technology
- Beijing 100124
- China
| | - Chengchu Zeng
- Beijing Key Laboratory of Environmental and Viral Oncology
- College of Life Science & Bioengineering
- Beijing University of Technology
- Beijing 100124
- China
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49
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Inatomi T, Fukahori Y, Yamada Y, Ishikawa R, Kanegawa S, Koga Y, Matsubara K. Ni(i)–Ni(iii) cycle in Buchwald–Hartwig amination of aryl bromide mediated by NHC-ligated Ni(i) complexes. Catal Sci Technol 2019. [DOI: 10.1039/c8cy02427h] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
NHC-ligated Ni(i) intermediates in Buchwald–Hartwig amination of aryl halides were isolated and determined. The presence of a Ni(iii) intermediate was also indicated at low temperature.
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Affiliation(s)
| | - Yukino Fukahori
- Department of Chemistry
- Fukuoka University
- Fukuoka 814-0180
- Japan
| | - Yuji Yamada
- Department of Chemistry
- Fukuoka University
- Fukuoka 814-0180
- Japan
| | - Ryuta Ishikawa
- Department of Chemistry
- Fukuoka University
- Fukuoka 814-0180
- Japan
| | - Shinji Kanegawa
- Institute for Advanced Materials Chemistry and Engineering
- Kyushu University
- Fukuoka 819-0395
- Japan
| | - Yuji Koga
- Department of Chemistry
- Fukuoka University
- Fukuoka 814-0180
- Japan
| | - Kouki Matsubara
- Department of Chemistry
- Fukuoka University
- Fukuoka 814-0180
- Japan
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50
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Taylor LJ, Kays DL. Low-coordinate first-row transition metal complexes in catalysis and small molecule activation. Dalton Trans 2019; 48:12365-12381. [DOI: 10.1039/c9dt02402f] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this Perspective, we will highlight selected examples of transition metal complexes with low coordination numbers whose high reactivity has been exploited in catalysis and the activation of small molecules featuring strong bonds (N2, CO2, and CO).
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Affiliation(s)
| | - Deborah L. Kays
- School of Chemistry
- University of Nottingham
- University Park
- Nottingham
- UK
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