1
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Mast M, Schubert H, Mayer HA, Wesemann L. Trianionic Carbocyclic NCN Pincer Ligand: Coordination Chemistry and Reactivity Studies. Inorg Chem 2024; 63:10860-10870. [PMID: 38804041 DOI: 10.1021/acs.inorgchem.4c01602] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2024]
Abstract
(BCHT-NCN)H3 (1) [1,6-bis(methylene(bis-2,6-diisopropylaniline)(benzo)cycloheptatriene)] was synthesized by nucleophilic substitution treating 1,6-bis(methylenebromide)(benzo)cycloheptatriene with 2 equiv of Li[2,6-iPr2C6H3NH], Li[Dipp-NH]. Triple deprotonation of (BCHT-NCN)H3 (1) using n-BuLi yields the deprotonation product [(BCHT-NCN)Li3] (2), which crystallizes as a dimer [{[BCHT-NCN]Li3(Et2O)2}2] (2)2. Coordination compounds of the trianionic pincer ligand were obtained with SnCl2, YCl3(THF)3.5, and HfCl4(THF)2: [(BCHT-NCN)SnLi] (3), [(BCHT-NCN)Y(THF)2] (4), [(BCHT-NCN)HfCl2][Li(THF)4] (5), respectively. A hafnium hydride complex [(BCHT-NCN)HfH(HBEt3)][K(Et2O)2] (6) was isolated after reaction of 5 with K[HBEt3]. A MeNHC substitution product [(BCHT-NCN)HfCl(MeNHC)] (7) was synthesized treating compound 5 with MeNHC at rt. Following an n-BuLi reaction of 7 gives an alkyl complex [(BCHT-NCN)Hf(n-Bu)(MeNHC)] (8). Thermolysis of 7 yields the isomerization product [(BCHT-NCN#)HfCl(MeNHC)] (9), which was transferred into a methyl complex [(BCHT-NCN#)HfMe(MeNHC)] (10) upon treatment with MeMgBr. Hydride abstraction from complex 9 leads to a cationic complex [(BCHT-NCN+)HfCl(MeNHC)][Al(OtBuF)4] (11).
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Affiliation(s)
- Maximilian Mast
- Institut für Anorganische Chemie, Eberhard Karls Universität, Tübingen, Auf der Morgenstelle 18, Tübingen 72076, Germany
| | - Hartmut Schubert
- Institut für Anorganische Chemie, Eberhard Karls Universität, Tübingen, Auf der Morgenstelle 18, Tübingen 72076, Germany
| | - Hermann A Mayer
- Institut für Anorganische Chemie, Eberhard Karls Universität, Tübingen, Auf der Morgenstelle 18, Tübingen 72076, Germany
| | - Lars Wesemann
- Institut für Anorganische Chemie, Eberhard Karls Universität, Tübingen, Auf der Morgenstelle 18, Tübingen 72076, Germany
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2
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Donnelly LJ, Lin JB, Gelfand BS, Chang CY, Piers WE. Ruthenium polyhydrides supported by rigid PCP pincer ligands: dynamic behaviour and reactions with CO 2. Dalton Trans 2024; 53:1862-1869. [PMID: 38179611 DOI: 10.1039/d3dt04014c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
Two rigid β-elimination immune PCcarbeneP pincer ligands, differing in their electron donor properties by variation of the substitution pattern on the aromatic linker arms, were complexed to ruthenium to form the dichlorides LRRuCl2 (R = H or NMe2). These compounds were converted to hydrido chlorides by treatment with dihydrogen (H2) and a base. By converting to tert-butoxide derivatives in situ under an atmosphere of H2, the poly hydride PCalkylP complexes LHRRu(H)3 compounds were generated. In these complexes, H2 has added across the RuC bond in the PCcarbeneP starting materials. The polyhydrides are dynamic in solution and extensive NMR studies helped to elucidate the speciation and fluxional processes operative in this dynamic system. The polyhydride complexes react rapidly with CO2 to give the PCcarbeneP formato hydride complexes LRRu(H)-κ2-O2CH. For R = H, the 1,2-hydride shift from the anchoring alkyl of the PCalkylP carbon to the metal is reversible, but for R = NMe2 it is irreversible. The CO2 incorporated into the formato ligand of these compounds exchanges with free CO2via a bimolecular mechanism that is more rapid for R = NMe2 than for R = H; plausible explanations for this observation are proffered. Experiments designed to evaluate the efficacy of the R = NMe2 formato hydride complex as a catalyst precursor for CO2 hydrogenation to formate salts reveal poor performance in comparison to state-of-the-art ruthenium-based catalysts. This is due primarily to the precipitation of a dimeric μ-κ2-κ1-CO3 carbonate complex that is not an active catalyst for the reaction.
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Affiliation(s)
- Laurie J Donnelly
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada.
| | - Jian-Bin Lin
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada.
| | - Benjamin S Gelfand
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada.
| | - Chia Yun Chang
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada.
| | - Warren E Piers
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada.
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3
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Piers W, Clapson M, Dubrawski Z, Gelfand B. Facile Deoxygenative Reduction of a Bridging Carbonato Ligand with Silyl and Boryl 4,4’‐Bipyridinylidene Reagents. Z Anorg Allg Chem 2022. [DOI: 10.1002/zaac.202200272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Warren Piers
- University of Calgary Department of Chemistry 2500 University Dr. NW T2N 1N4 Calgary CANADA
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4
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Clapson ML, Kirkland JK, Piers WE, Ess DH, Gelfand B, Lin JB. Carbene Character in a Series of Neutral PCcarbeneP Cobalt(I) Complexes: Radical Carbenes versus Nucleophilic Carbenes. Organometallics 2022. [DOI: 10.1021/acs.organomet.1c00585] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Marissa L. Clapson
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, T2N 1N4 Canada
| | - Justin K. Kirkland
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Warren E. Piers
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, T2N 1N4 Canada
| | - Daniel H. Ess
- Department of Chemistry and Biochemistry, Brigham Young University, Provo, Utah 84602, United States
| | - Benjamin Gelfand
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, T2N 1N4 Canada
| | - Jian-Bin Lin
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, T2N 1N4 Canada
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5
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Takahashi K, Iwasawa N. Reversible C–C Double Bond Cleavage to Form a Metal Carbene and an Alkene Enabled on an Iridium Complex Bearing a Pincer-type Alkoxycarbene Ligand. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kohei Takahashi
- Department of Chemistry, Tokyo Institute of Technology, O-okayama,
Meguro-ku, Tokyo 152-8551, Japan
| | - Nobuharu Iwasawa
- Department of Chemistry, Tokyo Institute of Technology, O-okayama,
Meguro-ku, Tokyo 152-8551, Japan
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7
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Wang Q, Manzano RA, Tinnermann H, Sung S, Leforestier B, Krämer T, Young RD. Access to and Reactivity of Fe
0
, Fe
−I
, Fe
I
, and Fe
II
PC
carbene
P Pincer Complexes. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104130] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Qingyang Wang
- Department of Chemistry National University of Singapore Singapore
| | | | | | - Simon Sung
- Department of Chemistry National University of Singapore Singapore
| | - Baptiste Leforestier
- Department of Chemistry University of Warwick UK
- Department of Chemistry Maynooth University Ireland
| | | | - Rowan D. Young
- Department of Chemistry National University of Singapore Singapore
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8
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Wang Q, Manzano RA, Tinnermann H, Sung S, Leforestier B, Krämer T, Young RD. Access to and Reactivity of Fe 0 , Fe -I , Fe I , and Fe II PC carbene P Pincer Complexes. Angew Chem Int Ed Engl 2021; 60:18168-18177. [PMID: 34145715 DOI: 10.1002/anie.202104130] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 06/17/2021] [Indexed: 12/11/2022]
Abstract
Despite their promising metal-ligand cooperative reactivity, PCcarbene P pincer ligands are rarely reported for first-row transition-metal centres. Using a dehydration methodology, we report access to an Fe0 PCcarbene P pincer complex (1) that proceeds via an isolated α-hydroxylalkyl hydrido complex (3). Reversible carbonyl migration to the carbene position in 1 is found to allow coordination chemistry and E-H bond addition (E=H, B, Cl) across the iron-carbene linkage, representing a unique mechanism for metal-ligand cooperativity. The PCcarbene P pincer ligand is also found to stabilize formal FeII , FeI , and Fe-I oxidation states, as demonstrated with synthesis and characterization of the complexes [11-X][BArF 20 ] (X=Br, I), 12, and K[13]. Compound K[13] is found to be highly reactive, and abstracts hydrogen from a range of aliphatic C-H sources. Computational analysis by DFT suggests that the formal FeI and Fe-I complexes contain significant carbene radical character. The ability of the PCcarbene P ligand scaffold to partake in metal-ligand cooperativity and to support a range of iron oxidation states renders it as potentially useful in many catalytic applications.
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Affiliation(s)
- Qingyang Wang
- Department of Chemistry, National University of Singapore, Singapore
| | - Richard A Manzano
- Department of Chemistry, National University of Singapore, Singapore
| | | | - Simon Sung
- Department of Chemistry, National University of Singapore, Singapore
| | - Baptiste Leforestier
- Department of Chemistry, University of Warwick, UK.,Department of Chemistry, Maynooth University, Ireland
| | - Tobias Krämer
- Department of Chemistry, Maynooth University, Ireland
| | - Rowan D Young
- Department of Chemistry, National University of Singapore, Singapore
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9
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Yeo A, Sanz CA, Fryzuk MD. Forays into rhodium macrocyclic chemistry stabilized by a P 2N 2 donor set. Activation of dihydrogen and benzene. Dalton Trans 2021; 50:899-907. [PMID: 33351000 DOI: 10.1039/d0dt03688a] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of the dilithium diamido-diphosphine macrocycle, Li2[N(SiMe2CH2P(Ph)CH2SiMe2)2N] (Li2[P2N2]) with [Rh(COD)Cl]2 generates the dirhodium macrocyclic compound, [P2N2][Rh(COD)]2 (where COD = η4-1,5-cyclooctadiene), wherein both rhodium-COD units are syn to each other and have square planar geometries. While this dirhodium derivative does react with H2, no clean products could be isolated. Upon reaction of Li2[P2N2] with [Rh(COE)2Cl]2 (where COE is η2-cyclooctene), the dilithium-dihodium derivative ([Rh(COE)][P2N2]Li)2(dioxane) forms, which was characterized by single-crystal X-ray analysis and NMR spectroscopy. The cyclooctene derivative reacts with dihydrogen in benzene to generate the dilithium-dirhodium-dihydride complex ([Rh(H)2][P2N2]Li)2(dioxane); also formed is the dilithium-dirhodium-phenylhydride complex ([Rh(C6H5)H][P2N2]Li)2(dioxane) via oxidative addition of a C-H bond of the solvent. The phenyl-hydride is eventually converted to the dihydride derivative via further reaction with H2. This process is complicated by adventitious H2O, which leads to the isolation of the amine-dihydride, Rh[P2N2H](H)2; drying of the H2 eliminates this side product. Nevertheless, careful addition of H2O to ([Rh(COE)][P2N2]Li)2(dioxane) results in protonation of one of the amido units and the formation of the rhodium-amine cyclooctene derivative, Rh[P2N2H](COE), which upon reaction with H2 generates the aforementioned amine-dihydride, Rh[P2N2H](H)2. The mechanism by which dihydrogen and C-H bonds of benzene are activated likely involves initial dissociation of cyclooctene from the 18-electron centers in ([Rh(COE)][P2N2]Li)2(dioxane), followed by H-H and C-H bond activation. The ability of one of the amido units of the P2N2 macrocycle to be protonated is a potentially useful proton storage mechanism and is of interest in other bond activation processes.
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Affiliation(s)
- Alyssa Yeo
- University of British Columbia, Department of Chemistry, Vancouver, BC, Canada.
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10
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Kuwabara T, Toriumi T, Suzuki M, Ishii Y. Selective Double CH Activation at a Methylene Carbon in Methylenediphenol Derivatives to Generate Carbene-Bridged Dinuclear Iridium Complexes. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00595] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Takuya Kuwabara
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Takuya Toriumi
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Mika Suzuki
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
| | - Youichi Ishii
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo 112-8551, Japan
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11
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Smith JD, Durrant G, Ess DH, Gelfand BS, Piers WE. H/D exchange under mild conditions in arenes and unactivated alkanes with C 6D 6 and D 2O using rigid, electron-rich iridium PCP pincer complexes. Chem Sci 2020; 11:10705-10717. [PMID: 34094323 PMCID: PMC8162389 DOI: 10.1039/d0sc02694h] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2020] [Accepted: 06/15/2020] [Indexed: 11/21/2022] Open
Abstract
The synthesis and characterization of an iridium polyhydride complex (Ir-H4) supported by an electron-rich PCP framework is described. This complex readily loses molecular hydrogen allowing for rapid room temperature hydrogen isotope exchange (HIE) at the hydridic positions and the α-C-H site of the ligand with deuterated solvents such as benzene-d6, toluene-d8 and THF-d8. The removal of 1-2 equivalents of molecular H2 forms unsaturated iridium carbene trihydride (Ir-H3) or monohydride (Ir-H) compounds that are able to create further unsaturation by reversibly transferring a hydride to the ligand carbene carbon. These species are highly active hydrogen isotope exchange (HIE) catalysts using C6D6 or D2O as deuterium sources for the deuteration of a variety of substrates. By modifying conditions to influence the Ir-Hn speciation, deuteration levels can range from near exhaustive to selective only for sterically accessible sites. Preparative level deuterations of select substrates were performed allowing for procurement of >95% deuterated compounds in excellent isolated yields; the catalyst can be regenerated by treatment of residues with H2 and is still active for further reactions.
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Affiliation(s)
- Joel D Smith
- Department of Chemistry, University of Calgary 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - George Durrant
- Department of Chemistry and Biochemistry, Brigham Young University Provo Utah 84602 USA
| | - Daniel H Ess
- Department of Chemistry and Biochemistry, Brigham Young University Provo Utah 84602 USA
| | - Benjamin S Gelfand
- Department of Chemistry, University of Calgary 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Warren E Piers
- Department of Chemistry, University of Calgary 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
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12
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Wiedmaier NR, Speth H, Leistikow G, Eichele K, Schubert H, Mayer HA, Wesemann L. Conformation controlled stepwise hydride shuffling from the metal to the ligand backbone. Dalton Trans 2020; 49:7218-7227. [DOI: 10.1039/d0dt01431a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The protonation of the benzo annulated cycloheptatriene PCP pincer ruthenium hydrido dicarbonyl complex using the superacid [H(Et2O)2][BArF24] launches a cascade of hydride shifts which lead to the hydrogenation of the ligand backbone.
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Affiliation(s)
| | - Hansjörg Speth
- Institut für Anorganische Chemie
- Universität Tübingen
- 72076 Tübingen
- Germany
| | - Georg Leistikow
- Institut für Anorganische Chemie
- Universität Tübingen
- 72076 Tübingen
- Germany
| | - Klaus Eichele
- Institut für Anorganische Chemie
- Universität Tübingen
- 72076 Tübingen
- Germany
| | - Hartmut Schubert
- Institut für Anorganische Chemie
- Universität Tübingen
- 72076 Tübingen
- Germany
| | - Hermann A. Mayer
- Institut für Anorganische Chemie
- Universität Tübingen
- 72076 Tübingen
- Germany
| | - Lars Wesemann
- Institut für Anorganische Chemie
- Universität Tübingen
- 72076 Tübingen
- Germany
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13
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Khristolyubov DO, Lyubov DM, Shavyrin AS, Cherkasov AV, Fukin GK, Trifonov AA. Ln( ii) and Ca( ii) NC sp3N pincer type diarylmethanido complexes – promising catalysts for C–C and C–E (E = Si, P, N, S) bond formation. Inorg Chem Front 2020. [DOI: 10.1039/d0qi00369g] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The first examples of Ln(ii) (Ln = Yb, Sm) and Ca [NCsp3N] pincer type diarylmethanido complexes were synthesized and successfully used as efficient and selective precatalyst for intermolecular C–C and C–E bond formation.
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Affiliation(s)
| | - Dmitry M. Lyubov
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
| | - Andrey S. Shavyrin
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
| | - Anton V. Cherkasov
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
| | - Georgy K. Fukin
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
| | - Alexander A. Trifonov
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
- Institute of Organoelement Compounds of Russian Academy of Sciences
- Moscow
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14
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Recent advances in the chemistry of group 9—Pincer organometallics. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2020. [DOI: 10.1016/bs.adomc.2019.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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15
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Barnett HJ, Hill AF. Halogenation of A-frame μ-carbido complexes: a diamagnetic rhodium(ii) carbido complex. Chem Commun (Camb) 2020; 56:7738-7740. [DOI: 10.1039/d0cc02349c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Chlorination of the new μ-carbido [Rh2(μ-C)Cl2(μ-dppf)2] (dppf = 1,1′-bis(diphenylphosphino)ferrocene) affords the dirhodium(ii) complex [Rh2(μ-C)Cl4(μ-dppf)2] the carbido bridge of which can only be adequately described by delocalised bonding.
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Affiliation(s)
| | - Anthony F. Hill
- Research School of Chemistry
- Australian National University
- Canberra
- Australia
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16
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Synthesis and characterization of iridium hydride complexes with meso-Ph2PCH2P(Ph)CH2P(Ph)CH2PPh2 (meso-dpmppm) as an unsymmetric pincer ligand. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2019.03.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Smith JD, Chih E, Piers WE, Spasyuk DM. Tuning iridium (I) PCcarbeneP frameworks for facile cooperative N2O reduction. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.08.054] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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18
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Himmelbauer D, Mastalir M, Stöger B, Veiros LF, Kirchner K. Synthesis and Reactivity of Group Six Metal PCP Pincer Complexes: Reversible CO Addition Across the Metal–C aryl Bond. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00447] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | | | | | - Luis F. Veiros
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais No. 1, 1049-001 Lisboa, Portugal
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19
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Sung S, Wang Q, Krämer T, Young RD. Synthesis and reactivity of a PC carbeneP cobalt(i) complex: the missing link in the cobalt PXP pincer series (X = B, C, N). Chem Sci 2018; 9:8234-8241. [PMID: 30542572 PMCID: PMC6240806 DOI: 10.1039/c8sc02782j] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 09/05/2018] [Indexed: 02/05/2023] Open
Abstract
We report the first example of a cobalt PCcarbeneP pincer complex (1) featuring a central alkylidene carbon donor accessed through the dehydration of an alcoholic POP proligand.
We report the first example of a cobalt PCcarbeneP pincer complex (1) featuring a central alkylidene carbon donor accessed through the dehydration of an alcoholic POP proligand. Complex 1 shares bonding similarities with cobalt PBP and PNP pincer complexes where the donor atom engages in π-bonding with the cobalt centre, and thus completes the PXP (X = B, C, N) pincer ligand series for cobalt (for X donors that partake in M–L π-bonding). As compared to PBP and PNP pincer complexes, which are known to be good hydride and proton acceptors (respectively), complex 1 is found to be an effective hydrogen atom acceptor. Complex 1 partakes in cooperative ligand reactivity, engaging in several small molecule activations with styrene, bromine, carbon disulphide, phenyl acetylene, acetonitrile, hydrogen, benzaldehyde and water (through microreversibility). The mechanism for the formation of complex 1 is studied through the isolation and computational analysis of key intermediates. The formation of 1 is found to avoid C–H activation of the proligand, and instead proceeds through a combination of O–H activation, hydrogen atom transfer, β-hydride elimination and hydrogen activation processes.
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Affiliation(s)
- Simon Sung
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , Singapore 117543 .
| | - Qingyang Wang
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , Singapore 117543 .
| | - Tobias Krämer
- Department of Chemistry , Maynooth University , Maynooth , Ireland
| | - Rowan D Young
- Department of Chemistry , National University of Singapore , 3 Science Drive 3 , Singapore 117543 .
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20
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LaPierre EA, Piers WE, Gendy C. Divergent Reactivity of CO2, CO, and Related Substrates at the Nickel Carbon Double Bond of (PCcarbeneP)Ni(II) Pincer Complexes. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00440] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Affiliation(s)
- Etienne A. LaPierre
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, Canada T2N 1N4
| | - Warren E. Piers
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, Canada T2N 1N4
| | - Chris Gendy
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, Canada T2N 1N4
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21
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22
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The chemistry of the carbon-transition metal double and triple bond: Annual survey covering the year 2016. Coord Chem Rev 2018. [DOI: 10.1016/j.ccr.2017.09.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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23
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LaPierre EA, Clapson ML, Piers WE, Maron L, Spasyuk DM, Gendy C. Oxygen Atom Transfer to Cationic PCPNi(II) Complexes Using Amine-N-Oxides. Inorg Chem 2017; 57:495-506. [DOI: 10.1021/acs.inorgchem.7b02766] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Etienne A. LaPierre
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, Canada T2N 1N4
| | - Marissa L. Clapson
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, Canada T2N 1N4
| | - Warren E. Piers
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, Canada T2N 1N4
| | - Laurent Maron
- LPCNO, Université de Toulouse, INSA, UPS, LPCNO, 135
avenue de Rangueil, F-31077 Toulouse, France
| | - Denis M. Spasyuk
- Canadian Light Source, Inc., 44 Innovation Boulevard, Saskatoon, Saskatchewan, Canada S7N 2V3
| | - Chris Gendy
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta, Canada T2N 1N4
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24
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Kosanovich AJ, Press LP, Ozerov OV. Boryl transfer reactivity of a POCOP-supported Ir-diboryl: Reduction of CO2 to CO and borylation of other small molecules. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2016.12.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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25
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Puerta Lombardi BM, Brown RM, Gendy C, Chang CY, Chivers T, Roesler R. Nickel and Platinum PCP Pincer Complexes Incorporating an Acyclic Diaminoalkyl Central Moiety Connecting Imidazole or Pyrazole Rings. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00396] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Braulio M. Puerta Lombardi
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Rudy M. Brown
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Chris Gendy
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Chia Yun Chang
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Tristram Chivers
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Roland Roesler
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
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26
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Affiliation(s)
- Louise M. Guard
- Department
of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Travis J. Hebden
- Department
of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
| | - Donald E. Linn
- Department
of Chemistry, Indiana University-Purdue University Fort Wayne, 2101 Coliseum Boulevard, East Science Building 496, Fort Wayne, Indiana 46805-1499, United States
| | - D. Michael Heinekey
- Department
of Chemistry, University of Washington, Seattle, Washington 98195-1700, United States
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27
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Sung S, Joachim T, Krämer T, Young RD. Protonolysis of an α-Hydroxyl Ligand for the Generation of a PCcarbeneP Pincer Complex and Subsequent Reactivity Studies. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00461] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Simon Sung
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Timothy Joachim
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Tobias Krämer
- Institute
of Chemical Sciences, Heriot-Watt University, Edinburgh EH14 4AS, United Kingdom
| | - Rowan D. Young
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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28
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Doyle LE, Piers WE, Bi DW. Cationic PCP iridaepoxide and carbene complexes for facile water elimination and activation processes. Dalton Trans 2017; 46:4346-4354. [DOI: 10.1039/c7dt00563f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Pathways for water activation and elimination at cationic iridium PCP pincer compounds are explored.
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Affiliation(s)
| | | | - David W. Bi
- Department of Chemistry
- University of Calgary
- Calgary
- Canada
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29
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Sung S, Young RD. Facile generation of iridium PCcarbeneP pincer complexes via water elimination from an alcohol proligand. Dalton Trans 2017; 46:15407-15414. [DOI: 10.1039/c7dt03690f] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
We report the facile generation of Ir PCcarbeneP pincer systems.
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Affiliation(s)
- Simon Sung
- Department of Chemistry
- National University of Singapore
- Singapore 117543
| | - Rowan D. Young
- Department of Chemistry
- National University of Singapore
- Singapore 117543
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30
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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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