51
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Bennett MA, Bhargava SK, Mirzadeh N, Privér SH. The use of [2-C 6 R 4 PPh 2 ] − (R = H, F) and related carbanions as building blocks in coordination chemistry. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2018.05.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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52
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Da Costa RC, Rawe BW, Tsoureas N, Haddow MF, Sparkes HA, Tizzard GJ, Coles SJ, Owen GR. Preparation and reactivity of rhodium and iridium complexes containing a methylborohydride based unit supported by two 7-azaindolyl heterocycles. Dalton Trans 2018; 47:11047-11057. [PMID: 30027202 DOI: 10.1039/c8dt02311e] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and characterisation of a new anionic flexible scorpionate ligand, methyl(bis-7-azaindolyl)borohydride [MeBai]- is reported herein. The ligand was coordinated to a series of group nine transition metal centres forming the complexes, [Ir(MeBai)(COD)] (1), [Rh(MeBai)(COD)] (2), [Rh(MeBai)(CODMe)] (2-Me) and [Rh(MeBai)(NBD)] (3), where COD = 1,5-cyclooctadiene, CODMe = 3-methyl-1,5-cyclooctadiene and NBD = 2,5-norbornadiene. In all cases, the boron based ligand was found to bind to the metal centres via a κ3-N,N,H coordination mode. The ligand and complexes were fully characterised by spectroscopic and analytical methods. The structures of the ligand and three of the complexes were confirmed by X-ray crystallography. The potential for migration of the "hydride" or "methyl" units from boron to the metal centre was also explored. During these studies an unusual transformation, involving the oxidation of the rhodium centre, was observed in complex 2. In this case, the η4-COD unit transformed into a η1,η3-C8H12 unit where the ring was bound via one sigma bond and one allyl unit. This is the first time such a transformation has been observed at a rhodium centre.
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53
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Takaoka S, Eizawa A, Kusumoto S, Nakajima K, Nishibayashi Y, Nozaki K. Hydrogenation of Carbon Dioxide with Organic Base by PCIIP-Ir Catalysts. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00377] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Satoko Takaoka
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Aya Eizawa
- Department of Systems Innovation, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Shuhei Kusumoto
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kazunari Nakajima
- Department of Systems Innovation, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yoshiaki Nishibayashi
- Department of Systems Innovation, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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54
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You D, Yang H, Sen S, Gabbaï FP. Modulating the σ-Accepting Properties of an Antimony Z-type Ligand via Anion Abstraction: Remote-Controlled Reactivity of the Coordinated Platinum Atom. J Am Chem Soc 2018; 140:9644-9651. [PMID: 29979870 DOI: 10.1021/jacs.8b05520] [Citation(s) in RCA: 54] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
In search of ligand platforms, which can be used to remotely control the catalytic activity of a transition metal, we have investigated the coordination noninnocence of ambiphilic L2/Z-type ligands containing a trifluorostiborane unit as a Lewis acid. The known dichlorostiboranyl platinum complex (( o-(Ph2P)C6H4)2SbCl2)PtCl (1) reacts with TlF in the presence of acetonitrile (MeCN) and cyclohexyl isocyanide (CyNC) to afford the trifluorostiborane platinum complexes 2 ((( o-(Ph2P)C6H4)2SbF3)Pt-NCMe) and 3 ((( o-(Ph2P)C6H4)2SbF3)Pt-CNCy), respectively. Formation of these complexes, which results from a redistribution of the halide ligands about the dinuclear core, affects the nature of the Pt-Sb bond. The latter switches from covalent in 1 to polar covalent (or dative) in 2 and 3 where the trifluorostiborane moiety engages the platinum center in a Pt → Sb interaction. The polarity of the Pt-Sb bond can be modulated further by abstraction of an antimony-bound fluoride ligand using B(C6F5)3. These reactions afford the cationic complexes [(( o-(Ph2P)C6H4)2SbF2)Pt-NCMe]+ ([5]+) and [(( o-(Ph2P)C6H4)2SbF2)Pt-CNCy]+ ([6]+) which have been isolated as [BF(C6F5)3]- salts. These complexes possess a highly Lewis acidic difluorostibonium moiety, which exerts an intense draw on the electron density of the platinum center. As a result, the latter becomes significantly more electrophilic. In the case of [5]+, which contains a labile acetonitrile ligand, this increased electrophilicity translates into increased carbophilicity as reflected by the ability of this complex to promote enyne cyclization reactions. These results demonstrate that the coordination noninnocence of antimony Z-ligands can be used to adjust the catalytic activity of an adjoining metal center.
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Affiliation(s)
- Di You
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Haifeng Yang
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - Srobona Sen
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
| | - François P Gabbaï
- Department of Chemistry , Texas A&M University , College Station , Texas 77843-3255 , United States
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55
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Zimmerman AC, Fryzuk MD. β-Hydrogen Elimination and Reductive Elimination from a κ 3-PPC Nickel Complex. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00297] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Amanda C. Zimmerman
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6Z 1Z1
| | - Michael D. Fryzuk
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6Z 1Z1
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56
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Sung S, Ang A, Hill AF, Ma C, Kong RY, Ward JS, Young RD. Bimetallic Complexes of Group 8, 9, and 11 Metals Bridged by RB(NCH
2
PPh
2
)
2
C
6
H
4
(R = H, 4‐C
6
H
4
X; X = H, Me, F) Ligands. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800448] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Simon Sung
- Department of Chemistry National University of Singapore 12 Science Drive 2 117549 Singapore Singapore
| | - Angelina Ang
- Department of Chemistry National University of Singapore 12 Science Drive 2 117549 Singapore Singapore
| | - Anthony F. Hill
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Chenxi Ma
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Richard Y. Kong
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Jas S. Ward
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Rowan D. Young
- Department of Chemistry National University of Singapore 12 Science Drive 2 117549 Singapore Singapore
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57
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Tagne Kuate AC, Lalancette RA, Bannenberg T, Jäkle F. Diferrocenylmercury‐Bridged Diphosphine: A Chiral, Ambiphilic, and Redox‐Active Bidentate Ligand. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803086] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alain C. Tagne Kuate
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
- Department of Chemistry Faculty of Science University of Dschang P.O. Box 67 Dschang Cameroon
| | - Roger A. Lalancette
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Frieder Jäkle
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
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58
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Eleazer BJ, Peryshkov DV. Coordination Chemistry of Carborane Clusters: Metal-Boron Bonds in Carborane, Carboranyl, and Carboryne Complexes. COMMENT INORG CHEM 2018. [DOI: 10.1080/02603594.2018.1465939] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Bennett J. Eleazer
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, USA
| | - Dmitry V. Peryshkov
- Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina, USA
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59
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Tagne Kuate AC, Lalancette RA, Bannenberg T, Jäkle F. Diferrocenylmercury‐Bridged Diphosphine: A Chiral, Ambiphilic, and Redox‐Active Bidentate Ligand. Angew Chem Int Ed Engl 2018; 57:6552-6557. [DOI: 10.1002/anie.201803086] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Indexed: 11/05/2022]
Affiliation(s)
- Alain C. Tagne Kuate
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
- Department of Chemistry Faculty of Science University of Dschang P.O. Box 67 Dschang Cameroon
| | - Roger A. Lalancette
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Frieder Jäkle
- Department of Chemistry Rutgers University—Newark 73 Warren Street Newark NJ 07102 USA
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60
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Nakayama S, Morisako S, Yamashita M. Synthesis and Application of Pyrrole-Based PNP–Ir Complexes to Catalytic Transfer Dehydrogenation of Cyclooctane. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00072] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Shin Nakayama
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27, Kasuga, Bunkyo-ku, 112-8551 Tokyo, Japan
| | - Shogo Morisako
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
| | - Makoto Yamashita
- Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi 464-8603, Japan
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61
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Eleazer BJ, Smith MD, Popov AA, Peryshkov DV. Expansion of the (BB) 〉metallacycle with coinage metal cations: formation of B-M-Ru-B (M = Cu, Ag, Au) dimetalacyclodiboryls. Chem Sci 2018; 9:2601-2608. [PMID: 29675252 PMCID: PMC5892348 DOI: 10.1039/c8sc00190a] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2018] [Accepted: 02/03/2018] [Indexed: 01/12/2023] Open
Abstract
In this work, we introduce a novel approach for the selective assembly of heterometallic complexes by unprecedented coordination of coinage metal cations to strained single ruthenium-boron bonds on a surface of icosahedral boron clusters. M(i) cations (M = Cu, Ag, and Au) insert into B-Ru bonds of the (BB)-carboryne complex of ruthenium with the formation of four-membered B-M-Ru-B metalacycles. Results of theoretical calculations suggest that bonding within these metalacycles can be best described as unusual three-center-two-electron B-M···Ru interactions that are isolobal to B-H···Ru borane coordination for M = Cu and Ag, or the pairs of two-center-two electron B-Au and Au-Ru interactions for M = Au. These transformations comprise the first synthetic route to exohedral coinage metal boryl complexes of icosahedral closo-{C2B10} clusters, which feature short Cu-B (2.029(2) Å) and Ag-B (2.182(3) Å) bonds and the shortest Au-B bond (2.027(2) Å) reported to date. The reported heterometallic complexes contain Cu(i) and Au(i) centers in uncharacteristic square-planar coordination environments. These findings pave the way to rational construction of a broader class of multimetallic architectures featuring M-B bonds.
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Affiliation(s)
- Bennett J Eleazer
- Department of Chemistry and Biochemistry , University of South Carolina , 631 Sumter St. , Columbia , South Carolina 29208 , USA .
| | - Mark D Smith
- Department of Chemistry and Biochemistry , University of South Carolina , 631 Sumter St. , Columbia , South Carolina 29208 , USA .
| | - Alexey A Popov
- Leibniz Institute for Solid State and Materials Research , Helmholtzstrasse 20 , 01069 Dresden , Germany .
| | - Dmitry V Peryshkov
- Department of Chemistry and Biochemistry , University of South Carolina , 631 Sumter St. , Columbia , South Carolina 29208 , USA .
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62
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63
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Riddlestone IM, Rajabi NA, Macgregor SA, Mahon MF, Whittlesey MK. Well-Defined Heterobimetallic Reactivity at Unsupported Ruthenium-Indium Bonds. Chemistry 2018; 24:1732-1738. [PMID: 29240969 DOI: 10.1002/chem.201705796] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2017] [Indexed: 11/06/2022]
Abstract
The hydride complex [Ru(IPr)2 (CO)H][BArF4 ], 1, reacts with InMe3 with loss of CH4 to form [Ru(IPr)2 (CO)(InMe)(Me)][BArF4 ], 4, featuring an unsupported Ru-In bond with unsaturated Ru and In centres. 4 reacts with H2 to give [Ru(IPr)2 (CO)(η2 -H2 )(InMe)(H)][BArF4 ], 5, while CO induces formation of the indyl complex [Ru(IPr)2 (CO)3 (InMe2 )][BArF4 ], 7. These observations highlight the ability of Me to shuttle between Ru and In centres and are supported by DFT calculations on the mechanism of formation of 4 and its reactions with H2 and CO. An analysis of Ru-In bonding in these species is also presented. Reaction of 1 with GaMe3 also involves CH4 loss but, in contrast to its In congener, sees IPr transfer from Ru to Ga to give a gallyl complex featuring an η6 interaction of one aryl substituent with Ru.
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Affiliation(s)
- Ian M Riddlestone
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, United Kingdom
| | - Nasir A Rajabi
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, United Kingdom
| | - Stuart A Macgregor
- Institute of Chemical Sciences, Heriot-Watt University, Edinburgh, EH14 4AS, United Kingdom
| | - Mary F Mahon
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, United Kingdom
| | - Michael K Whittlesey
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, United Kingdom
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64
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Owen GR. Functional group migrations between boron and metal centres within transition metal-borane and -boryl complexes and cleavage of H-H, E-H and E-E' bonds. Chem Commun (Camb) 2018; 52:10712-26. [PMID: 27489890 DOI: 10.1039/c6cc03817d] [Citation(s) in RCA: 83] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
This feature article examines some of the recent advances in the chemistry of Z-type transition metal-borane and X-type transition metal-boryl complexes. It focuses on the employment of these boron-based functionalities acting as stores and transfer agents for functional groups such as hydrides, alkyl groups and aryl groups which can either be abstracted or delivered to the metal centre. The review also explores the rather novel reactivity involving the cleavage of H-H, E-H and E-E' bonds (where E and E' are a range of groups) across the transition metal-boron bond in such complexes. It explores the early examples of the addition of H-H across transition metal-borane bonds and describes the new transformation in the context of other known modes of hydrogen activation including classic oxidative addition and heterolytic cleavage at transition metal centres as well as Frustrated Lewis Pair chemistry. Similar reactivity involving transition metal-boryl complexes are also described particularly those which undergo both boryl-to-borane and borane-to-borohydride transformations. The delivery of hydride to the metal centre in combination with the potential to regenerate the borohydride functional group via a recharging process is explored in the context of providing a new strategy for catalysis. Finally, a light-hearted look at the analogy of the 'stinging processes' involving Trofimenko type ligands is taken one step further to determine whether it is indeed in the nature of scorpionate ligands to repeatedly 'sting' just as the real life scorpions do.
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Affiliation(s)
- Gareth R Owen
- School of Applied Science, University of South Wales, Upper Glyntaff, Pontypridd, CF37 4AT, UK.
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65
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Bai H, Xu H, Zhang H, Guo Y, Shan J, Wei D, Zhu Y, Zhang S, Zhang W. Theoretical investigations of the Ir-catalyzed direct borylation of B(3,6)–H of o-carborane: the actual catalyst, mechanism, and origin of regioselectivity. Catal Sci Technol 2018. [DOI: 10.1039/c8cy01322e] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
The IrIII species is proved to be the actual catalyst. The electron-delocalized structure and the inductive effects of the carbon centers is account for the regioselectivity.
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Affiliation(s)
- Huining Bai
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P. R. China
| | - Hao Xu
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P. R. China
| | - Huimin Zhang
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P. R. China
| | - Yuen Guo
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P. R. China
| | - Jiankai Shan
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P. R. China
| | - Donghui Wei
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P. R. China
| | - Yanyan Zhu
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P. R. China
| | - Shouren Zhang
- Henan Provincial Key Laboratory of Nanocomposites and Applications
- Institute of Nanostructured Functional Materials
- Huanghe Science and Technology College
- Zhengzhou
- China
| | - Wenjing Zhang
- College of Chemistry and Molecular Engineering
- Zhengzhou University
- Zhengzhou
- P. R. China
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66
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Vondung L, Sattler LE, Langer R. Ambireactive (R3
P)2
BH2
Groups Facilitating Temperature-Switchable Bond Activation by an Iron Complex. Chemistry 2017; 24:1358-1364. [DOI: 10.1002/chem.201704018] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/28/2017] [Indexed: 12/20/2022]
Affiliation(s)
- Lisa Vondung
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Str. 4 35032 Marburg Germany
| | - Lars E. Sattler
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Str. 4 35032 Marburg Germany
| | - Robert Langer
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Str. 4 35032 Marburg Germany
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67
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Iannetelli A, Tizzard G, Coles SJ, Owen GR. Sequential Migrations between Boron and Rhodium Centers: A Cooperative Process between Rhodium and a Monosubstituted Borohydride Unit. Inorg Chem 2017; 57:446-456. [DOI: 10.1021/acs.inorgchem.7b02700] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Angelo Iannetelli
- School of Applied
Science, University of South Wales, Treforest CF37 4AT, United Kingdom
| | - Graham Tizzard
- National Crystallography Service, School
of Chemistry, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Simon J. Coles
- National Crystallography Service, School
of Chemistry, University of Southampton, Southampton SO17 1BJ, United Kingdom
| | - Gareth R. Owen
- School of Applied
Science, University of South Wales, Treforest CF37 4AT, United Kingdom
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68
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Ceylan YS, Cundari TR. Computational Analysis of Transition Metal-Terminal Boride Complexes. J Phys Chem A 2017; 121:9358-9368. [PMID: 29129056 DOI: 10.1021/acs.jpca.7b09103] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A computational analysis of model transition-metal terminal boride [MB(PNPR)] complexes is reported. A combination of density functional theory methods, natural bond orbital analysis, and multiconfiguration self-consistent field calculations were employed to investigate the structure and bonding of terminal boride complexes, in particular, the extent of metal dπ-boron pπ bonding. Comparison of metal-boride, -borylene, and-boryl bond lengths confirms the presence of metal-boron π bonds, albeit the modest shortening (∼3%) of the metal-boron bond suggests that the π-bonding is very weak in terminal borides. Calculated free energies of H2 addition to the boride complexes to yield the corresponding boryl complexes indicate that metal-boride π-bond strengths are 22 kcal/mol or less as compared to 44 kcal/mol for an analogous nitride complex. It is concluded that, for the boride complexes studied, covering a range of different 4d and 5d metals, that the metal-boride bond consists of a reasonably covalent σ but two very polarized metal-boron π bonds. The high polarization of the boron-to-metal π bonds indicates that the terminal boride is an acceptor or Z-type ligand.
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Affiliation(s)
| | - Thomas R Cundari
- Department of Chemistry and Center of Advanced Scientific Computing and Modeling, University of North Texas , 115 Union Circle, No. 305070, Denton, Texas 76203-5017, United States
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69
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Shih WC, Ozerov OV. Selective ortho C–H Activation of Pyridines Directed by Lewis Acidic Boron of PBP Pincer Iridium Complexes. J Am Chem Soc 2017; 139:17297-17300. [DOI: 10.1021/jacs.7b10570] [Citation(s) in RCA: 59] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei-Chun Shih
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Oleg V. Ozerov
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
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70
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Sen S, Ke IS, Gabbaï FP. T-Shaped Gold→Stiborane Complexes as Carbophilic Catalysts: Influence of the Peripheral Substituents. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00654] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Srobona Sen
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
| | - Iou-Sheng Ke
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
| | - François P. Gabbaï
- Department of Chemistry, Texas A&M University, College Station, Texas 77843-3255, United States
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71
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Eleazer BJ, Smith MD, Popov AA, Peryshkov DV. Rapid reversible borane to boryl hydride exchange by metal shuttling on the carborane cluster surface. Chem Sci 2017; 8:5399-5407. [PMID: 28970919 PMCID: PMC5609532 DOI: 10.1039/c7sc01846k] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 05/24/2017] [Indexed: 01/20/2023] Open
Abstract
In this work, we introduce a novel concept of a borane group vicinal to a metal boryl bond acting as a supporting hemilabile ligand in exohedrally metalated three-dimensional carborane clusters. The (POBOP)Ru(Cl)(PPh3) pincer complex (POBOP = 1,7-OP(i-Pr)2-m-2-carboranyl) features extreme distortion of the two-center-two-electron Ru-B bond due to the presence of a strong three-center-two-electron B-H···Ru vicinal interaction. Replacement of the chloride ligand with a hydride afforded the (POBOP)Ru(H)(PPh3) pincer complex, which possesses B-Ru, B-H···Ru, and Ru-H bonds. This complex was found to exhibit a rapid exchange between hydrogen atoms of the borane and the terminal hydride through metal center shuttling between two boron atoms of the carborane cage. This exchange process, which involves sequential cleavage and formation of strong covalent metal-boron and metal-hydrogen bonds, is unexpectedly facile at temperatures above -50 °C corresponding to an activation barrier of 12.2 kcal mol-1. Theoretical calculations suggested two equally probable pathways for the exchange process through formally Ru(0) or Ru(iv) intermediates, respectively. The presence of this hemilabile vicinal B-H···Ru interaction in (POBOP)Ru(H)(PPh3) was found to stabilize a latent coordination site at the metal center promoting efficient catalytic transfer dehydrogenation of cyclooctane under nitrogen and air at 170 °C.
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Affiliation(s)
- Bennett J Eleazer
- Department of Chemistry and Biochemistry , University of South Carolina , 631 Sumter St. , Columbia , South Carolina 29208 , USA .
| | - Mark D Smith
- Department of Chemistry and Biochemistry , University of South Carolina , 631 Sumter St. , Columbia , South Carolina 29208 , USA .
| | - Alexey A Popov
- Leibniz Institute for Solid State and Materials Research , Helmholtzstrasse 20 , 01069 Dresden , Germany .
| | - Dmitry V Peryshkov
- Department of Chemistry and Biochemistry , University of South Carolina , 631 Sumter St. , Columbia , South Carolina 29208 , USA .
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72
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Suárez E, Plou P, Gusev DG, Martín M, Sola E. Cationic, Neutral, and Anionic Hydrides of Iridium with PSiP Pincers. Inorg Chem 2017; 56:7190-7199. [DOI: 10.1021/acs.inorgchem.7b00833] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Elizabeth Suárez
- Instituto de Síntesis
Química y Catálisis Homogénea, CSIC, Universidad de Zaragoza, Zaragoza E50009, Spain
| | - Pablo Plou
- Instituto de Síntesis
Química y Catálisis Homogénea, CSIC, Universidad de Zaragoza, Zaragoza E50009, Spain
| | - Dmitry G. Gusev
- Department of Chemistry, Wilfrid Laurier University, Waterloo, Ontario N2L 3C5, Canada
| | - Marta Martín
- Instituto de Síntesis
Química y Catálisis Homogénea, CSIC, Universidad de Zaragoza, Zaragoza E50009, Spain
| | - Eduardo Sola
- Instituto de Síntesis
Química y Catálisis Homogénea, CSIC, Universidad de Zaragoza, Zaragoza E50009, Spain
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73
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Kwan EH, Ogawa H, Yamashita M. A Highly Active PBP–Iridium Catalyst for the Dehydrogenation of Dimethylamine–Borane: Catalytic Performance and Mechanism. ChemCatChem 2017. [DOI: 10.1002/cctc.201700384] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Enrique Huang Kwan
- Department of Applied Chemistry Faculty of Science and Engineering, Chuo University 1-13-27 Kasuga Bunkyo-ku 112-8551 Tokyo Japan
| | - Hayato Ogawa
- Department of Applied Chemistry Faculty of Science and Engineering, Chuo University 1-13-27 Kasuga Bunkyo-ku 112-8551 Tokyo Japan
| | - Makoto Yamashita
- Department of Molecular and Macromolecular Chemistry Graduate School of Engineering Nagoya University Furo-cho Chikusa-ku 464-8603 Nagoya Japan
- Research Development Initiative Chuo University 1-13-27 Kasuga Bunkyo-ku 112-8551 Tokyo Japan
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74
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Shih WC, Gu W, MacInnis MC, Herbert DE, Ozerov OV. Boryl/Borane Interconversion and Diversity of Binding Modes of Oxygenous Ligands in PBP Pincer Complexes of Rhodium. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00070] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei-Chun Shih
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Weixing Gu
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Morgan C. MacInnis
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - David E. Herbert
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Oleg V. Ozerov
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
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75
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Stephan DW. Eine Geschichte über zwei Elemente: die Umpolung der Lewis-Acidität/Basizität von Bor und Phosphor. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700721] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Douglas W. Stephan
- Department of Chemistry; University of Toronto; 80 St. George St Toronto Ontario M5S3H6 Kanada
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76
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Stephan DW. A Tale of Two Elements: The Lewis Acidity/Basicity Umpolung of Boron and Phosphorus. Angew Chem Int Ed Engl 2017; 56:5984-5992. [DOI: 10.1002/anie.201700721] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Douglas W. Stephan
- Department of Chemistry; University of Toronto; 80 St. George St Toronto Ontario M5S3H6 Canada
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77
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Iridium-catalysed regioselective borylation of carboranes via direct B-H activation. Nat Commun 2017; 8:14827. [PMID: 28300061 PMCID: PMC5357313 DOI: 10.1038/ncomms14827] [Citation(s) in RCA: 116] [Impact Index Per Article: 16.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2016] [Accepted: 02/02/2017] [Indexed: 12/30/2022] Open
Abstract
Carboranes are carbon-boron molecular clusters, which can be viewed as three-dimensional analogues to benzene. They are finding many applications in medicine, materials and organometallic chemistry. On the other hand, their exceptional thermal and chemical stabilities, as well as 3D structures, make them very difficult to be functionalized, in particular the regioselective functionalization of BH vertex among ten similar B-H bonds. Here we report a very efficient iridium-catalysed borylation of cage B(3,6)-H bonds of o-carboranes with excellent yields and regioselectivity using bis(pinacolato)diboron (B2pin2) as a reagent. Selective cage B(4)-H borylation has also been achieved by introducing a bulky TBDMS (tert-butyldimethylsilyl) group to one cage carbon vertex. The resultant 3,6-(Bpin)2-o-carboranes are useful synthons for the synthesis of a wide variety of B(3,6)-difunctionalized o-carboranes bearing cage B-X (X=O, N, C, I and Br) bonds.
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78
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POBOP pincer complexes of nickel(II): Synthesis and B H activation of the carborane ligand upon oxidation with iodine. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2016.10.040] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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79
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Zhang J, Lin J, Li Y, Shao Y, Huang X, Zhao C, Ke Z. The effect of auxiliary ligand on the mechanism and reactivity: DFT study on H2 activation by Lewis acid–transition metal complex (tris(phosphino)borane)Fe(L). Catal Sci Technol 2017. [DOI: 10.1039/c7cy01217a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The crucial role of the auxiliary ligand in hydrogen activation is revealed by DFT studies for the LA–TM ferraboratrane complex.
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Affiliation(s)
- Jianyu Zhang
- School of Materials Science & Engineering
- PCFM Lab, School of Chemistry
- Sun Yat-sen University
- Guangzhou 510275
- P. R. China
| | - Jiasheng Lin
- School of Materials Science & Engineering
- PCFM Lab, School of Chemistry
- Sun Yat-sen University
- Guangzhou 510275
- P. R. China
| | - Yinwu Li
- School of Materials Science & Engineering
- PCFM Lab, School of Chemistry
- Sun Yat-sen University
- Guangzhou 510275
- P. R. China
| | - Youxiang Shao
- School of Materials Science & Engineering
- PCFM Lab, School of Chemistry
- Sun Yat-sen University
- Guangzhou 510275
- P. R. China
| | - Xiao Huang
- School of Materials Science & Engineering
- PCFM Lab, School of Chemistry
- Sun Yat-sen University
- Guangzhou 510275
- P. R. China
| | - Cunyuan Zhao
- School of Materials Science & Engineering
- PCFM Lab, School of Chemistry
- Sun Yat-sen University
- Guangzhou 510275
- P. R. China
| | - Zhuofeng Ke
- School of Materials Science & Engineering
- PCFM Lab, School of Chemistry
- Sun Yat-sen University
- Guangzhou 510275
- P. R. China
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80
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Wang G, Liu L, Wang H, Ding YS, Zhou J, Mao S, Li P. N,B-Bidentate Boryl Ligand-Supported Iridium Catalyst for Efficient Functional-Group-Directed C–H Borylation. J Am Chem Soc 2016; 139:91-94. [DOI: 10.1021/jacs.6b11867] [Citation(s) in RCA: 114] [Impact Index Per Article: 14.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Guanghui Wang
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
| | - Li Liu
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
| | - Hong Wang
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
| | - You-Song Ding
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
| | - Jing Zhou
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
| | - Shuai Mao
- Department
of Medicinal Chemistry, School of Pharmacy, Xi’an Jiaotong University, Xi’an, 710061, China
| | - Pengfei Li
- Frontier
Institute of Science and Technology, Xi’an Jiaotong University, Xi’an, 710054, China
- State
Key Laboratory of Elemento-Organic Chemistry, Nankai University, Tianjin, 300071, China
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81
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Shih WC, Ozerov OV. Synthesis and Characterization of PBP Pincer Iridium Complexes and Their Application in Alkane Transfer Dehydrogenation. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00762] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Wei-Chun Shih
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Oleg V. Ozerov
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
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82
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Eleazer B, Smith MD, Popov AA, Peryshkov DV. (BB)-Carboryne Complex of Ruthenium: Synthesis by Double B-H Activation at a Single Metal Center. J Am Chem Soc 2016; 138:10531-8. [PMID: 27526855 PMCID: PMC4999960 DOI: 10.1021/jacs.6b05172] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2016] [Indexed: 12/22/2022]
Abstract
The first example of a transition metal (BB)-carboryne complex containing two boron atoms of the icosahedral cage connected to a single exohedral metal center (POBBOP)Ru(CO)2 (POBBOP = 1,7-OP(i-Pr)2-2,6-dehydro-m-carborane) was synthesized by double B-H activation within the strained m-carboranyl pincer framework. Theoretical calculations revealed that the unique three-membered (BB)>Ru metalacycle is formed by two bent B-Ru σ-bonds with the concomitant increase of the bond order between the two metalated boron atoms. The reactivity of the highly strained electron-rich (BB)-carboryne fragment with small molecules was probed by reactions with electrophiles. The carboryne-carboranyl transformations reported herein represent a new mode of cooperative metal-ligand reactivity of boron-based complexes.
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Affiliation(s)
- Bennett
J. Eleazer
- Department
of Chemistry and Biochemistry, University
of South Carolina, 631
Sumter Street, Columbia, South Carolina 29208, United States
| | - Mark D. Smith
- Department
of Chemistry and Biochemistry, University
of South Carolina, 631
Sumter Street, Columbia, South Carolina 29208, United States
| | - Alexey A. Popov
- Leibniz
Institute for Solid State and Materials Research, Helmholtzstrasse 20, 01069 Dresden, Germany
| | - Dmitry V. Peryshkov
- Department
of Chemistry and Biochemistry, University
of South Carolina, 631
Sumter Street, Columbia, South Carolina 29208, United States
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83
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Kelch H, Kachel S, Celik MA, Schäfer M, Wennemann B, Radacki K, Petrov AR, Tamm M, Braunschweig H. Elucidating the Reactivity of Vicinal Dicarbenoids: From Lewis Adduct Formation to B−C Bond Activation. Chemistry 2016; 22:13815-13818. [DOI: 10.1002/chem.201603234] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Hauke Kelch
- Institut für Anorganische Chemie; Julius-Maximilians Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Stephanie Kachel
- Institut für Anorganische Chemie; Julius-Maximilians Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Mehmet Ali Celik
- Institut für Anorganische Chemie; Julius-Maximilians Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Marius Schäfer
- Institut für Anorganische Chemie; Julius-Maximilians Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Benedikt Wennemann
- Institut für Anorganische Chemie; Julius-Maximilians Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Krzysztof Radacki
- Institut für Anorganische Chemie; Julius-Maximilians Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Alex R. Petrov
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Holger Braunschweig
- Institut für Anorganische Chemie; Julius-Maximilians Universität Würzburg; Am Hubland 97074 Würzburg Germany
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84
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Saleh LMA, Dziedzic RM, Khan SI, Spokoyny AM. Forging Unsupported Metal–Boryl Bonds with Icosahedral Carboranes. Chemistry 2016; 22:8466-70. [DOI: 10.1002/chem.201601292] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2016] [Indexed: 11/08/2022]
Affiliation(s)
- Liban M. A. Saleh
- Department of Chemistry and Biochemistry University of California, Los Angeles (UCLA) 607 Charles E. Young Drive East Los Angeles CA 90095 USA
| | - Rafal M. Dziedzic
- Department of Chemistry and Biochemistry University of California, Los Angeles (UCLA) 607 Charles E. Young Drive East Los Angeles CA 90095 USA
| | - Saeed I. Khan
- Department of Chemistry and Biochemistry University of California, Los Angeles (UCLA) 607 Charles E. Young Drive East Los Angeles CA 90095 USA
| | - Alexander M. Spokoyny
- Department of Chemistry and Biochemistry University of California, Los Angeles (UCLA) 607 Charles E. Young Drive East Los Angeles CA 90095 USA
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85
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Abstract
Recent advances in the use of tethered π-coordinating ligands for metal–ligand cooperation.
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Affiliation(s)
- Dide G. A. Verhoeven
- Organic Chemistry & Catalysis
- Debye Institute for Nanomaterials Science
- Utrecht University
- Universiteitsweg 99
- 3584 CG Utrecht
| | - Marc-Etienne Moret
- Organic Chemistry & Catalysis
- Debye Institute for Nanomaterials Science
- Utrecht University
- Universiteitsweg 99
- 3584 CG Utrecht
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86
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Schuhknecht D, Ritter F, Tauchert ME. Isolation and properties of a palladium PBP pincer complex featuring an ambiphilic boryl site. Chem Commun (Camb) 2016; 52:11823-11826. [DOI: 10.1039/c6cc07079e] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The ambiphilic boryl site in the PBP pincer [{(o-PPh2C6H4)2B}PdIII] reacts with Lewis bases.
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Affiliation(s)
- Danny Schuhknecht
- Institute of Inorganic Chemistry
- RWTH Aachen University
- D-52074 Aachen
- Germany
| | - Florian Ritter
- Institute of Inorganic Chemistry
- RWTH Aachen University
- D-52074 Aachen
- Germany
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87
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Kwan EH, Kawai YJ, Kamakura S, Yamashita M. A long-tethered (P–B–P)-pincer ligand: synthesis, complexation, and application to catalytic dehydrogenation of alkanes. Dalton Trans 2016; 45:15931-15941. [DOI: 10.1039/c6dt02075e] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new long-tethered boron-containing (P–B–P)-pincer ligand has been synthesized. This ligand was introduced to Ir to form (P–B–P)Ir(H)Cl complex. Subsequent reaction with nBuLi led to the formation of dihydride complex (P–B–P)Ir(H)2. Both complexes were found to be moderately active for the catalytic dehydrogenation of alkanes.
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Affiliation(s)
- Enrique Huang Kwan
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Chuo University
- 112-8551 Tokyo
- Japan
| | - Yasushi Jack Kawai
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Chuo University
- 112-8551 Tokyo
- Japan
| | - Sei Kamakura
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Chuo University
- 112-8551 Tokyo
- Japan
| | - Makoto Yamashita
- Department of Applied Chemistry
- Faculty of Science and Engineering
- Chuo University
- 112-8551 Tokyo
- Japan
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