1
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Sarker RK, Zargarian D. Reactions of cyclonickelated complexes with hydroxylamines and TEMPO˙: isolation of new TEMPOH adducts of Ni(II) and their reactivities with nucleophiles and oxidants. Dalton Trans 2024; 53:10208-10219. [PMID: 38826045 DOI: 10.1039/d4dt00605d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2024]
Abstract
This contribution describes a study on the reactivities of the complexes [{κP,κC-(i-Pr)2PO-Ar}Ni(μ-Br)]2, 1a-d (Ar: C6H4, a; 3-Cl-C6H3, b; 3-OMe-C6H3, c; 4-OMe-napthalenyl, d), with hydroxylamines in the presence of TEMPO˙ (TEMPO˙ = (2,2,6,6-tetramethylpiperidinyl-1-yl)oxyl). The results of this study showed that treating 1a-d with a mixture of Et2NOH and TEMPO˙ did not afford the desired oxidation-induced functionalization of the Ni-aryl moiety in 1a-d, giving instead the corresponding κO-TEMPOH adducts [{κP,κC-(i-Pr)2PO-Ar}Ni(Br)(κO-TEMPOH)], 3a-d (TEMPOH = N-hydroxy-2,2,6,6-tetramethylpiperidine). The TEMPOH moiety in these zwitterionic compounds 3 can be displaced by a large excess of acetonitrile (MeCN), 10 equiv. of morpholine, or 1-2 equivalents of imidazole. Although these reactions have given the authenticated products [{κP,κC-(i-Pr)2PO-C6H4}Ni(Br)(NCMe)], 4a, [{κP,κC-(i-Pr)2PO-C6H4}Ni(Br)(morpholine)], 5a, and [{κP,κC-(i-Pr)2PO-C6H4}Ni(imidazole)2]Br, 6a, a few other products were also detected by NMR, indicating that the observed reactivities are far more complex than simple substitution of the TEMPOH moiety. Similarly, treating 3a with AgOC(O)CF3 results in the isolation of [{κP,κC-(i-Pr)2PO-C6H4}Ni{OC(O)CF3}(κO-TEMPOH)], 7a, arising from the substitution of the bromo ligand, whereas spectroscopic evidence suggests further reactivity, possibly including displacement of TEMPOH and oxidative decomposition.
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Affiliation(s)
- Rajib K Sarker
- Département de Chimie, Université de Montréal, Montréal, Québec, H3C 3J7, Canada.
| | - Davit Zargarian
- Département de Chimie, Université de Montréal, Montréal, Québec, H3C 3J7, Canada.
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2
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Takao T, Shimogawa R, Fujita R, Egawa S. Synthesis of a diruthenium μ-η 4-α-diimine complex via dehydrogenative coupling of cyclic amines and its role in dehydrogenative oxidation of pyrrolidine. Dalton Trans 2023; 52:16737-16753. [PMID: 37902063 DOI: 10.1039/d3dt03187j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2023]
Abstract
The reaction of [Cp‡Ru(μ-H)4RuCp‡] (1: Cp‡ = 1,2,4-tri-tert-butylcyclopentadienyl) with cyclic amines at 180 °C afforded a μ-η4-α-diimine complex, [(Cp‡Ru)2(μ-η4-C2nH4n-4N2)] (5a-c: n = 4, 5, 6), via dehydrogenative coupling of two cyclic amine molecules. An intermediate μ-η2-1-pyrroline complex, [{Cp‡Ru(μ-H)}2(μ-η2-C4H7N)] (2a), was synthesized by the photoreaction of 1 with pyrrolidine and 5a was shown to be formed via the disproportionation of 2a upon thermolysis yielding 1 and a μ-imidoyl complex, [(Cp‡Ru)2(μ-η2:η2-C4H6N)(μ-H)] (3a). Complex 3a was transformed into 5avia the incorporation of 1-pyrroline, which was formed by the reaction of 2a with H2. DFT calculations on the model complexes supported by C5H5 groups at the B3LYP level suggested that the μ-η4-α-diimine ligand is formed via the insertion of a terminal cyclic aminocarbene ligand into the Ru-C bond of the μ-imidoyl group followed by the elimination of hydrogen. Although 5a was inert under an Ar atmosphere, it catalyzed the dehydrogenative oxidation of pyrrolidine under an atmosphere of hydrogen to yield γ-butyrolactam. An active species possessing a terminal cyclic aminocarbene ligand was generated via the heterolytic activation of hydrogen at the Ru-N bond followed by C-C bond cleavage.
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Affiliation(s)
- Toshiro Takao
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
| | - Ryuichi Shimogawa
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
| | - Ryosuke Fujita
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
| | - Shu Egawa
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
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3
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Do DCH, Đorđević N, Huynh HV. Diverse Post-Metathesis Reactivities of Mixed Amido-Isothiocyanato Molybdenum Complexes. Inorg Chem 2023; 62:18583-18590. [PMID: 37921365 DOI: 10.1021/acs.inorgchem.3c02885] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2023]
Abstract
Attempts to prepare mixed isothiocyanato-bis(imido) MoVI complexes led to the discovery of post-metathesis rearrangements toward three distinct products (1-3), which feature the NCS-derived chelators [N(NMe2)CS]2- (L1 in dinuclear 1 and 2) and [N(SiMe3)(NMe2)CS]- (L2 in mononuclear 3). Notably, the preparation of bidentate ligand L1 and its coordination chemistry are unprecedented. Together with computational studies, it is proposed that the putative "mono-substituted" intermediate [Mo(NtBu)2(NMe2)(NCS)] serves as the common starting point for the observed molecular transformations. Construction of the [Mo(NtBu)2(NCS)2] core was ultimately possible in the presence of additional stabilizing donors (THF or PMe3), which yielded the complexes [Mo(NtBu)2(NCS)2(THF)2] (4) and [Mo(NtBu)2(NCS)2(PMe3)2] (5).
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Affiliation(s)
- Dinh Cao Huan Do
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Nemanja Đorđević
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Han Vinh Huynh
- Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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4
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Liu S, Jiang L. Copper-Catalyzed Multicomponent Reactions of Intramolecular and Intermolecular Thiotrifluoromethylation of Alkenes: Access to CF 3-Containing 2-Iminothiazolidines and Isothioureas. Org Lett 2022; 24:7157-7162. [PMID: 36166662 DOI: 10.1021/acs.orglett.2c02854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A copper-catalyzed multicomponent reaction of secondary amines bearing allyl substitution, isothiocyanates, and Togni reagent II has been developed under Cs2CO3 in DCE at 75 °C. An intermolecular multicomponent reaction of thioureas, activated and unactivated alkenes, and Togni reagent II has also been developed under DMAP in acetonitrile at room temperature. These two alkene difunctionalization reactions provide CF3-containing 2-iminothiazolindines and isothioureas in moderate to excellent yields with broad substrate scope and good functional group tolerance, respectively.
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Affiliation(s)
- Sainan Liu
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
| | - Liqin Jiang
- School of Chemistry and Molecular Engineering, East China Normal University, Shanghai 200241, China
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5
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Bresciani G, Bortoluzzi M, Marchetti F, Pampaloni G. Titanium(IV) Alkoxide‐Carbamate Complexes: Synthesis and Catalytic Potential in H2O2‐Oxidation of Organic Sulfides. Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Giulio Bresciani
- University of Pisa Department of Chemistry and Industrial Chemistry Via Giuseppe Moruzzi, 13 56124 Pisa ITALY
| | - Marco Bortoluzzi
- Ca' Foscari University of Venice: Universita Ca' Foscari Department of Molecular Science and Nanosystems ITALY
| | - Fabio Marchetti
- University of Pisa: Universita degli Studi di Pisa Department of Chemistry and Industrial Chemistry ITALY
| | - Guido Pampaloni
- University of Pisa: Universita degli Studi di Pisa Department of Chemistry and Industrial Chemistry ITALY
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6
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Boehm P, Müller P, Finkelstein P, Rivero-Crespo MA, Ebert MO, Trapp N, Morandi B. Mechanistic Investigation of the Nickel-Catalyzed Metathesis between Aryl Thioethers and Aryl Nitriles. J Am Chem Soc 2022; 144:13096-13108. [PMID: 35834613 DOI: 10.1021/jacs.2c01595] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Functional group metathesis is an emerging field in organic chemistry with promising synthetic applications. However, no complete mechanistic studies of these reactions have been reported to date, particularly regarding the nature of the key functional group transfer mechanism. Unraveling the mechanism of these transformations would not only allow for their further improvement but would also lead to the design of novel reactions. Herein, we describe our detailed mechanistic studies of the nickel-catalyzed functional group metathesis reaction between aryl methyl sulfides and aryl nitriles, combining experimental and computational results. These studies did not support a mechanism proceeding through reversible migratory insertion of the nitrile into a Ni-Ar bond and provided strong support for an alternative mechanism involving a key transmetalation step between two independently generated oxidative addition complexes. Extensive kinetic analysis, including rate law determination and Eyring analysis, indicated the oxidative addition complex of aryl nitrile as the resting state of the catalytic reaction. Depending on the concentration of aryl methyl sulfide, either the reductive elimination of aryl nitrile or the oxidative addition into the C(sp2)-S bond of aryl methyl sulfide is the turnover-limiting step of the reaction. NMR studies, including an unusual 31P-2H HMBC experiment using deuterium-labeled complexes, unambiguously demonstrated that the sulfide and cyanide groups exchange during the transmetalation step, rather than the two aryl moieties. In addition, Eyring and Hammett analyses of the transmetalation between two Ni(II) complexes revealed that this central step proceeds via an associative mechanism. Organometallic studies involving the synthesis, isolation, and characterization of all putative intermediates and possible deactivation complexes have further shed light on the reaction mechanism, including the identification of a key deactivation pathway, which has led to an improved catalytic protocol.
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Affiliation(s)
- Philip Boehm
- Laboratorium für Organische Chemie, ETH Zürich, 8093 Zürich, Switzerland
| | - Patrick Müller
- Laboratorium für Organische Chemie, ETH Zürich, 8093 Zürich, Switzerland
| | | | | | - Marc-Olivier Ebert
- Laboratorium für Organische Chemie, ETH Zürich, 8093 Zürich, Switzerland
| | - Nils Trapp
- Laboratorium für Organische Chemie, ETH Zürich, 8093 Zürich, Switzerland
| | - Bill Morandi
- Laboratorium für Organische Chemie, ETH Zürich, 8093 Zürich, Switzerland
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7
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Hierlmeier G, Wolf R. Diphosphorus Release and Heterocumulene Oligomerisation by Nickel Complexes. Eur J Inorg Chem 2022; 2022:e202101057. [PMID: 35915815 PMCID: PMC9314841 DOI: 10.1002/ejic.202101057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2021] [Revised: 02/12/2022] [Indexed: 11/11/2022]
Abstract
The generation of diphosphorus molecules P2 under mild conditions in solution is a useful strategy to generate diphosphines via [4+2] cycloadditions. We recently described the release of P2 units from the nickel butterfly complex [{(IMes)Ni(CO)}2(μ2,η2:η2-P2)] (IMes=1,3-bis(2,4,6-trimethylphenyl)imidazolin-2-ylidene) upon addition of CO gas. Herein, we developed an alternative protocol for the same process using heterocumulenes. In addition to formation of P4 (the dimerisation product of P2), the reactions afford nickel complexes of novel pincer-type ligands. Aryl isothiocyanates undergo a trimerisation within the coordination sphere of nickel and afford square planar nickel complexes with S-C-S pincer-ligand frameworks. Carbon disulfide coordinates to the [(IMes)Ni]-fragment in an η2-fashion, affording a dinuclear complex. Similar products are formed when the N-heterocyclic carbene nickel(0) complex [(IMes)Ni(vtms)2] is used as a precursor (vtms=vinyltrimethylsilane).
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Affiliation(s)
- Gabriele Hierlmeier
- Universität RegensburgInstitut für Anorganische Chemie93040RegensburgGermany
- Princeton UniversityDepartment of ChemistryFrick Laboratory 206PrincetonNJ 08544USA
| | - Robert Wolf
- Universität RegensburgInstitut für Anorganische Chemie93040RegensburgGermany
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8
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Gunasekara T, Tong Y, Speelman AL, Erickson JD, Appel AM, Hall MB, Wiedner ES. Role of High-Spin Species and Pendant Amines in Electrocatalytic Alcohol Oxidation by a Nickel Phosphine Complex. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05509] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Thilina Gunasekara
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Yicheng Tong
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Amy L. Speelman
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Jeremy D. Erickson
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Aaron M. Appel
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
| | - Michael B. Hall
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Eric S. Wiedner
- Center for Molecular Electrocatalysis, Pacific Northwest National Laboratory, Richland, Washington 99352, United States
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9
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Hollenhorst H, McDonald R, Ferguson M, Turculet L. Synthesis of Rhodium and Iridium Complexes Supported by Bis(indolylphosphino)silyl Pincer Ligation: Competitive N–H and C–H Bond Activation by an Ir(I) Species. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00114] [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)
- Helia Hollenhorst
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, P.O. Box 15000, Halifax, Nova Scotia B3H 4R2, Canada
| | - Robert McDonald
- X-ray Crystallography Laboratory, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Michael Ferguson
- X-ray Crystallography Laboratory, Department of Chemistry, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Laura Turculet
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, P.O. Box 15000, Halifax, Nova Scotia B3H 4R2, Canada
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10
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Bresciani G, Biancalana L, Pampaloni G, Marchetti F. Recent Advances in the Chemistry of Metal Carbamates. Molecules 2020; 25:E3603. [PMID: 32784784 PMCID: PMC7465543 DOI: 10.3390/molecules25163603] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 07/31/2020] [Accepted: 08/03/2020] [Indexed: 12/12/2022] Open
Abstract
Following a related review dating back to 2003, the present review discusses in detail the various synthetic, structural and reactivity aspects of metal species containing one or more carbamato ligands, representing a large family of compounds across all the periodic table. A preliminary overview is provided on the reactivity of carbon dioxide with amines, and emphasis is given to recent findings concerning applications in various fields.
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Affiliation(s)
| | | | - Guido Pampaloni
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, I-56124 Pisa, Italy; (G.B.); (L.B.)
| | - Fabio Marchetti
- Department of Chemistry and Industrial Chemistry, University of Pisa, Via G. Moruzzi 13, I-56124 Pisa, Italy; (G.B.); (L.B.)
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11
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Martínez‐Prieto LM, Cámpora J. Nickel and Palladium Complexes with Reactive σ‐Metal‐Oxygen Covalent Bonds. Isr J Chem 2020. [DOI: 10.1002/ijch.202000001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Luis M. Martínez‐Prieto
- Instituto de Tecnología Química. CSIC –Universidad Politécnica de Valencia Avda. Los Naranjos, S/N 46022 Valencia Spain
| | - Juan Cámpora
- Instituto de Investigaciones Químicas, CSIC –Universidad de Sevilla. C/ Américo Vespucio, 49. 41092 Seville Spain
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12
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Orsino A, Gutiérrez del Campo M, Lutz M, Moret ME. Enhanced Catalytic Activity of Nickel Complexes of an Adaptive Diphosphine-Benzophenone Ligand in Alkyne Cyclotrimerization. ACS Catal 2019; 9:2458-2481. [PMID: 30854242 PMCID: PMC6400243 DOI: 10.1021/acscatal.8b05025] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 01/29/2019] [Indexed: 12/15/2022]
Abstract
Adaptive ligands, which can adapt their coordination mode to the electronic structure of various catalytic intermediates, offer the potential to develop improved homogeneous catalysts in terms of activity and selectivity. 2,2'-Diphosphinobenzophenones have previously been shown to act as adaptive ligands, the central ketone moiety preferentially coordinating reduced metal centers. Herein, the utility of this scaffold in nickel-catalyzed alkyne cyclotrimerization is investigated. The complex [( p-tolL1)Ni(BPI)] ( p-tolL1 = 2,2'-bis(di(para-tolyl)phosphino)-benzophenone; BPI = benzophenone imine) is an active catalyst in the [2 + 2 + 2] cyclotrimerization of terminal alkynes, selectively affording 1,2,4-substituted benzenes from terminal alkynes. In particular, this catalyst outperforms closely related bi- and tridentate phosphine-based Ni catalysts. This suggests a reaction pathway involving a hemilabile interaction of the C=O unit with the nickel center. This is further borne out by a comparative study of the observed resting states and DFT calculations.
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Affiliation(s)
- Alessio
F. Orsino
- Utrecht
University, Organic Chemistry
and Catalysis, Debye Institute for Nanomaterials Science, Faculty
of Science, Universiteitsweg
99, 3584 CG Utrecht, The Netherlands
| | - Manuel Gutiérrez del Campo
- Utrecht
University, Organic Chemistry
and Catalysis, Debye Institute for Nanomaterials Science, Faculty
of Science, Universiteitsweg
99, 3584 CG Utrecht, The Netherlands
| | - Martin Lutz
- Utrecht
University, Crystal and Structural
Chemistry, Bijvoet Center for Biomolecular Research, Faculty of Science, Padualaan 8, 3584 CH Utrecht, The Netherlands
| | - Marc-Etienne Moret
- Utrecht
University, Organic Chemistry
and Catalysis, Debye Institute for Nanomaterials Science, Faculty
of Science, Universiteitsweg
99, 3584 CG Utrecht, The Netherlands
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13
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Martínez-Prieto LM, Palma P, Cámpora J. Monomeric alkoxide and alkylcarbonate complexes of nickel and palladium stabilized with the iPrPCP pincer ligand: a model for the catalytic carboxylation of alcohols to alkyl carbonates. Dalton Trans 2019; 48:1351-1366. [PMID: 30608093 DOI: 10.1039/c8dt04919j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Monomeric alkoxo complexes of the type [(iPrPCP)M-OR] (M = Ni or Pd; R = Me, Et, CH2CH2OH; iPrPCP = 2,6-bis(diisopropylphosphino)phenyl) react rapidly with CO2 to afford the corresponding alkylcarbonates [(iPrPCP)M-OCOOR]. We have investigated the reactions of these compounds as models for key steps of catalytic synthesis of organic carbonates from alcohols and CO2. The MOCO-OR linkage is kinetically labile, and readily exchanges the OR group with water or other alcohols (R'OH), to afford equilibrium mixtures containing ROH and [(iPrPCP)M-OCOOH] (bicarbonate) or [(iPrPCP)M-OCOOR'], respectively. However, [(iPrPCP)M-OCOOR] complexes are thermally stable and remain indefinitely stable in solution when these are kept in sealed vessels. The constants for the exchange equilibria have been interpreted, showing that CO2 insertion into M-O bonds is thermodynamically more favorable for M-OR than for M-OH. Alkylcarbonate complexes [(iPrPCP)M-OCOOR] fail to undergo nucleophilic attack by ROH to yield organic carbonates ROCOOR, either intermolecularly (using neat ROH solvent) or in intramolecular fashion (e.g., [(iPrPCP)M-OCOOCH2CH2OH]). In contrast, [(iPrPCP)M-OCOOMe] complexes react with a variety of electrophilic methylating reagents (MeX) to afford dimethylcarbonate and [(iPrPCP)M-X]. The reaction rates increase in the order X = OTs < IMe ≪ OTf and Ni < Pd. These findings suggest that a suitable catalyst design should combine basic and electrophilic alcohol activation sites in order to perform alkyl carbonate syntheses via direct alcohol carboxylation.
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Affiliation(s)
- Luis M Martínez-Prieto
- Instituto de Investigaciones Químicas. CSIC-Universidad de Sevilla, C/Américo Vespucio, 49, 41092, Sevilla, Spain.
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14
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Desulfurization of dibenzothiophene and dibenzothiophene sulfone via Suzuki–Miyaura type reaction: Direct access to o-terphenyls and polyphenyl derivatives. Polyhedron 2018. [DOI: 10.1016/j.poly.2018.08.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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15
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Verhoeven DGA, Negenman HA, Orsino AF, Lutz M, Moret ME. Versatile Coordination and C-C Coupling of Diphosphine-Tethered Imine Ligands with Ni(II) and Ni(0). Inorg Chem 2018; 57:10846-10856. [PMID: 30113165 PMCID: PMC6150681 DOI: 10.1021/acs.inorgchem.8b01478] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
![]()
Ligands
that can adapt their coordination mode to the electronic properties
of a metal center are of interest to support catalysis or small molecule
activation processes. In this context, the ability of imine moieties
to bind in either an η1(N)-fashion via σ-donation
of the lone pair or, less commonly, in an η2(C,N)-fashion
via π-coordination is potentially attractive for the design
of new metal–ligand cooperative systems. Herein, the coordination
chemistry of chelating ligands with a diphosphine imine framework
(PCNP) to nickel is investigated. The imine moiety binds in an η1(N)-fashion in a Ni(II)Cl2 complex. The uncommon
η2(C,N)-interaction is obtained in Ni(0) complexes
in the presence of a PPh3 coligand. Increasing the bulk
on the phosphine side-arms in the Ni(0) complexes, by substituting
phenyl for o-tolyl groups, leads to a distinct binding
mode in which only one of the phosphorus atoms is coordinated. In
the absence of a coligand, a mixture of two different dimeric Ni(0)
complexes is formed. In one of them, the imine adopts an uncommon
η1(N)η2(C,N) bridging mode of the
ligand to nickel, while the second one may involve reactivity on the
ligand by the formation of a new C–C bond by oxidative coupling.
The latter is supported by the isolation and structural characterization
of a crystalline bis-CO derivative featuring a C–C bond formed
by oxidative coupling of two imine moieties. The coordination chemistry
of a series of diphosphine-imine ligands (PCNP) to Ni is investigated,
with the purpose of developing systems that present metal−ligand
cooperativity. The ligands bind in versatile ways, adapting to the
oxidation state and coordination environment of the metal center.
Additionally, a dimeric derivative undergoes oxidative C−C
coupling in the presence of CO, resulting in an unusual mixed valence
Ni(II)/Ni(0) dinuclear complex.
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Affiliation(s)
- Dide G A Verhoeven
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science , Utrecht University , Universiteitsweg 99 , 3584 CG , Utrecht , The Netherlands
| | - Hidde A Negenman
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science , Utrecht University , Universiteitsweg 99 , 3584 CG , Utrecht , The Netherlands
| | - Alessio F Orsino
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science , Utrecht University , Universiteitsweg 99 , 3584 CG , Utrecht , The Netherlands
| | - Martin Lutz
- Crystal and Structural Chemistry, Bijvoet Center for Biomolecular Research, Faculty of Science , Utrecht University , Padualaan 8 , 3584 CH , Utrecht , The Netherlands
| | - Marc-Etienne Moret
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science , Utrecht University , Universiteitsweg 99 , 3584 CG , Utrecht , The Netherlands
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16
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Hazari N, Heimann JE. Carbon Dioxide Insertion into Group 9 and 10 Metal–Element σ Bonds. Inorg Chem 2017; 56:13655-13678. [DOI: 10.1021/acs.inorgchem.7b02315] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nilay Hazari
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
| | - Jessica E. Heimann
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520, United States
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17
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Arikawa Y, Nakamura T, Higashi T, Horiuchi S, Sakuda E, Umakoshi K. Reactivity of a Methoxido-Ruthenium Complex Bearing a Pincer-Type Bis(carbene) Ligand toward Thiocyanate, Carbon Disulfide, and Isothiocyanate. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201601324] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yasuhiro Arikawa
- Division of Chemistry and Materials Science; Graduate School of Engineering; Nagasaki University; Bunkyo-machi 1-14 852-8521 Nagasaki Japan
| | - Takuo Nakamura
- Division of Chemistry and Materials Science; Graduate School of Engineering; Nagasaki University; Bunkyo-machi 1-14 852-8521 Nagasaki Japan
| | - Takefumi Higashi
- Division of Chemistry and Materials Science; Graduate School of Engineering; Nagasaki University; Bunkyo-machi 1-14 852-8521 Nagasaki Japan
| | - Shinnosuke Horiuchi
- Division of Chemistry and Materials Science; Graduate School of Engineering; Nagasaki University; Bunkyo-machi 1-14 852-8521 Nagasaki Japan
| | - Eri Sakuda
- Division of Chemistry and Materials Science; Graduate School of Engineering; Nagasaki University; Bunkyo-machi 1-14 852-8521 Nagasaki Japan
| | - Keisuke Umakoshi
- Division of Chemistry and Materials Science; Graduate School of Engineering; Nagasaki University; Bunkyo-machi 1-14 852-8521 Nagasaki Japan
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18
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Bartalucci N, Bortoluzzi M, Marchetti F, Pampaloni G, Schoch S, Zacchini S. Unusual activation pathways of amines in the reactions with molybdenum pentachloride. NEW J CHEM 2017. [DOI: 10.1039/c6nj03992h] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Both single electron reduction and oxidation of Mo(v) guide the activation of a series of aliphatic amines when these are allowed to react with MoCl5.
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Affiliation(s)
- Niccolò Bartalucci
- Università di Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
| | - Marco Bortoluzzi
- Università di Venezia Ca' Foscari
- Dipartimento di Scienze Molecolari e Nanosistemi
- I-30170 Mestre (VE)
- Italy
| | - Fabio Marchetti
- Università di Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
| | - Guido Pampaloni
- Università di Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
| | - Silvia Schoch
- Università di Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
| | - Stefano Zacchini
- Università di Bologna
- Dipartimento di Chimica Industriale “Toso Montanari”
- I-40136 Bologna
- Italy
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19
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Desnoyer AN, Chiu W, Cheung C, Patrick BO, Love JA. Oxaziridine cleavage with a low-valent nickel complex: competing C–O and C–N fragmentation from oxazanickela(ii)cyclobutanes. Chem Commun (Camb) 2017; 53:12442-12445. [DOI: 10.1039/c7cc07690h] [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
Nickel(0) was found to oxidatively add to oxaziridines to form oxazanickelacyclobutanes which cleave to yield complicated mixtures, including nickel imido and aldehyde complexes.
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Affiliation(s)
| | - Weiling Chiu
- Department of Chemistry
- The University of British Columbia
- Vancouver
- Canada
| | - Candy Cheung
- Department of Chemistry
- The University of British Columbia
- Vancouver
- Canada
| | - Brian O. Patrick
- Department of Chemistry
- The University of British Columbia
- Vancouver
- Canada
| | - Jennifer A. Love
- Department of Chemistry
- The University of British Columbia
- Vancouver
- Canada
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20
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Pelties S, Wolf R. Reaction of Phenyl Iso(thio)cyanate with N-Heterocyclic Carbene-Supported Nickel Complexes: Formation of Nickelacycles. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00473] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stefan Pelties
- University of Regensburg, Institute of Inorganic Chemistry, D-93040 Regensburg, Germany
| | - Robert Wolf
- University of Regensburg, Institute of Inorganic Chemistry, D-93040 Regensburg, Germany
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21
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Zurita DA, Flores-Alamo M, García JJ. Catalytic transfer hydrogenation of azobenzene by low-valent nickel complexes: a route to 1,2-disubstituted benzimidazoles and 2,4,5-trisubstituted imidazolines. Dalton Trans 2016; 45:10389-401. [DOI: 10.1039/c6dt01674j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
The one-pot synthesis of 1,2-disubstituted benzimidazoles by the transfer hydrogenation of azobenzene, using benzylamine as a hydrogen donor is reported, catalyzed by 2 mol% of [Ni(COD)2] : dippe.
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Affiliation(s)
- Daniel A. Zurita
- Facultad de Quimica
- Universidad Nacional Autonoma de Mexico
- Mexico City 04510
- Mexico
| | - Marcos Flores-Alamo
- Facultad de Quimica
- Universidad Nacional Autonoma de Mexico
- Mexico City 04510
- Mexico
| | - Juventino J. García
- Facultad de Quimica
- Universidad Nacional Autonoma de Mexico
- Mexico City 04510
- Mexico
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22
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Martínez-Prieto LM, Ávila E, Palma P, Álvarez E, Cámpora J. β-Hydrogen Elimination Reactions of Nickel and Palladium Methoxides Stabilised by PCP Pincer Ligands. Chemistry 2015; 21:9833-49. [DOI: 10.1002/chem.201500652] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2015] [Indexed: 11/08/2022]
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23
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Castellanos-Blanco N, Flores-Alamo M, García JJ. Tandem hydrogenation and condensation of fluorinated α,β-unsaturated ketones with primary amines, catalyzed by nickel. Dalton Trans 2015; 44:15653-63. [PMID: 26250992 DOI: 10.1039/c5dt02366a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A simple homogeneous catalytic system based on nickel phosphine complexes has been developed for the transfer hydrogenation and condensation of α,β-unsaturated ketones to yield saturated ones and saturated imines using primary amines as hydrogen donors.
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Affiliation(s)
- Nahury Castellanos-Blanco
- Facultad de Química
- Universidad Nacional Autónoma de México
- Circuito Interior
- Ciudad Universitaria
- Mexico City 04510
| | - Marcos Flores-Alamo
- Facultad de Química
- Universidad Nacional Autónoma de México
- Circuito Interior
- Ciudad Universitaria
- Mexico City 04510
| | - Juventino J. García
- Facultad de Química
- Universidad Nacional Autónoma de México
- Circuito Interior
- Ciudad Universitaria
- Mexico City 04510
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24
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Brink A, Truedsson I, Fleckhaus A, Johnson MT, Norrby PO, Roodt A, Wendt OF. Fast and reversible insertion of carbon dioxide into zirconocene-alkoxide bonds. A mechanistic study. Dalton Trans 2014; 43:8894-8. [PMID: 24796283 DOI: 10.1039/c3dt53566e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In two consecutive equilibria the compound (Cp*)2Zr(OMe)2 undergoes insertion of CO2 to form the mono- and bis-hemicarbonates. Both equilibria are exothermic but entropically disfavoured. Magnetisation transfer experiments gave kinetic data for the first equilibrium showing that the rate of insertion is overall second order with a rate constant of 3.20 ± 0.12 M(-1) s(-1), which is substantially higher than those reported for other early transition metal alkoxides, which are currently the best homogeneous catalysts for dimethyl carbonate formation from methanol and CO2. Activation parameters for the insertion reaction point to a highly ordered transition state and we interpret that as there being a substantial interaction between the CO2 and the metal during the C-O bond formation. This is supported by DFT calculations showing the lateral attack by CO2 to have the lowest energy transition state.
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Affiliation(s)
- Alice Brink
- Department of Chemistry, University of the Free State, Bloemfontein 9300, South Africa
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25
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Maudoux N, Fang J, Roisnel T, Dorcet V, Maron L, Carpentier J, Sarazin Y. CH Bond Activation with Triel Metals: Indium and Gallium Zwitterions through Internal Hydride Abstraction in Rigid Salan Ligands. Chemistry 2014; 20:7706-17. [DOI: 10.1002/chem.201402358] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/26/2014] [Indexed: 11/11/2022]
Affiliation(s)
- Nicolas Maudoux
- Organometallics: Materials and Catalysis Department, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS—Université de Rennes 1, Campus de Beaulieu, 35042 Rennes (France)
| | - Jian Fang
- Laboratoire de Physique et Chimie de Nano‐objets, UMR 5215 CNRS—Université de Toulouse, 135 avenue de Rangueil, 31077 Toulouse (France)
| | - Thierry Roisnel
- Centre de Diffractométrie des Rayons X, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS—Université de Rennes 1, 35042 Rennes (France)
| | - Vincent Dorcet
- Centre de Diffractométrie des Rayons X, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS—Université de Rennes 1, 35042 Rennes (France)
| | - Laurent Maron
- Laboratoire de Physique et Chimie de Nano‐objets, UMR 5215 CNRS—Université de Toulouse, 135 avenue de Rangueil, 31077 Toulouse (France)
| | - Jean‐François Carpentier
- Organometallics: Materials and Catalysis Department, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS—Université de Rennes 1, Campus de Beaulieu, 35042 Rennes (France)
| | - Yann Sarazin
- Organometallics: Materials and Catalysis Department, Institut des Sciences Chimiques de Rennes, UMR 6226 CNRS—Université de Rennes 1, Campus de Beaulieu, 35042 Rennes (France)
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26
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Tlahuext-Aca A, Hernández-Fajardo O, Arévalo A, García JJ. Synthesis of tetra-substituted imidazoles and 2-imidazolines by Ni(0)-catalyzed dehydrogenation of benzylic-type imines. Dalton Trans 2014; 43:15997-6005. [DOI: 10.1039/c4dt02313g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A one pot methodology using simple imines allowed the formation of N-substituted imidazoles and imidazolines.
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Affiliation(s)
- Adrian Tlahuext-Aca
- Facultad de Química
- Universidad Nacional Autónoma de México
- Circuito Interior
- Ciudad Universitaria
- MexicoCity, Mexico
| | - Oscar Hernández-Fajardo
- Facultad de Química
- Universidad Nacional Autónoma de México
- Circuito Interior
- Ciudad Universitaria
- MexicoCity, Mexico
| | - Alma Arévalo
- Facultad de Química
- Universidad Nacional Autónoma de México
- Circuito Interior
- Ciudad Universitaria
- MexicoCity, Mexico
| | - Juventino J. García
- Facultad de Química
- Universidad Nacional Autónoma de México
- Circuito Interior
- Ciudad Universitaria
- MexicoCity, Mexico
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27
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Kruckenberg A, Wadepohl H, Gade LH. Bis(diisopropylphosphinomethyl)amine Nickel(II) and Nickel(0) Complexes: Coordination Chemistry, Reactivity, and Catalytic Decarbonylative C–H Arylation of Benzoxazole. Organometallics 2013. [DOI: 10.1021/om400711d] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Achim Kruckenberg
- 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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28
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Li Q, Zhou S, Wang S, Zhu X, Zhang L, Feng Z, Guo L, Wang F, Wei Y. Dehydrogenation of secondary amines: synthesis, and characterization of rare-earth metal complexes incorporating imino- or amido-functionalized pyrrolyl ligands. Dalton Trans 2013; 42:2861-9. [DOI: 10.1039/c2dt32513f] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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29
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Laskowski CA, Morello GR, Saouma CT, Cundari TR, Hillhouse GL. Single-electron oxidation of N-heterocyclic carbene-supported nickel amides yielding benzylic C–H activation. Chem Sci 2013. [DOI: 10.1039/c2sc21345a] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
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30
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31
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Hsu JW, Lin YC, Hsiao CS, Datta A, Lin CH, Huang JH, Tsai JC, Hsu WC. Zirconium complexes incorporated with asymmetrical tridentate pincer type mono- and di-anionic pyrrolyl ligands: mechanism and reactivity as catalytic precursors. Dalton Trans 2012; 41:7700-7. [PMID: 22622350 DOI: 10.1039/c2dt30417a] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactions of Zr(NR(2))(4) (1, R = Me; 2, R = Et) with an asymmetrical tridentate pincer type pyrrole ligand precursor [C(4)H(2)NH(2-CH(2)NH(t)Bu)(5-CH(2)NMe(2))] and treatment of the derivatives with either PhNCS or PhNCO have been carried out and characterized. Reacting Zr(NR(2))(4) (1, R = Me; 2, R = Et) with [C(4)H(2)NH(2-CH(2)NH(t)Bu)(5-CH(2)NMe(2))] generates Zr[C(4)H(2)N(2-CH(2)N(t)Bu)(5-CH(2)NMe(2))](NR(2))(2) (3, R = Me; 4, R = Et) in high yield along with the elimination of 2 equiv of dimethylamine or diethylamine, respectively. Interestingly, while changing the solvent from Et(2)O to CH(2)Cl(2), the complex Zr[C(4)H(2)N(2-CH(2)N(t)Bu)(5-CH(2)NMe(2))][C(4)H(2)N(2-CH(2)NH(t)Bu)(5-CH(2)NMe(2))]Cl (5) is produced by undergoing C-Cl bond cleavage. Furthermore, reaction of either 3 or 4 with 1 or 2 equiv of PhNCS or PhNCO yields Zr[C(4)H(2)N(2-CH(2)N(t)Bu)(5-CH(2)NMe(2))](NMe(2))[PhNC(NMe(2))S] (6), Zr[C(4)H(2)N(2-CH(2)N(t)Bu)(5-CH(2)NMe(2))](NEt(2))[PhNC(NEt(2))O] (7) and Zr[C(4)H(2)N(2-CH(2)NH(t)Bu)(5-CH(2)NMe(2))][PhNC(NEt(2))O](3) (8), respectively. All the aforementioned complexes were characterized by (1)H and (13)C NMR spectrometry and the molecular structures of 5, 6, and 8 have been determined by single-crystal X-ray diffractometry. Complexes 4, 5, and 7 initiated the ethylene polymerization in the presence of MAO as the co-catalyst.
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Affiliation(s)
- Jia-Wei Hsu
- Department of Chemistry, National Changhua University of Education, Changhua 50058, Taiwan
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32
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Arunachalampillai A, Loganathan N, Wendt OF. Carboxylation of pincer PCP platinum methoxide complexes under formation of metalla carbonates. Polyhedron 2012. [DOI: 10.1016/j.poly.2011.08.028] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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33
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Marchetti F, Zacchini S, Salmi M, Busetto L, Zanotti V. C-H Activation in Diiron Bridging Vinyliminium Ligands: Reaction with CS2 to Form New Zwitterionic Complexes Acting as Organometallic Ligands. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201001167] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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34
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Ferro L, Hitchcock PB, Coles MP, Cox H, Fulton JR. Activation of carbon dioxide by divalent tin alkoxides complexes. Inorg Chem 2011; 50:1879-88. [PMID: 21229976 DOI: 10.1021/ic102273n] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
A series of terminal tin(II) alkoxides have been synthesized utilizing the bulky β-diketiminate ligand [{N(2,6-(i)Pr(2)C(6)H(3))-C(Me)}(2)CH] (BDI). The nucleophilicities of these alkoxides have been examined, and unexpected trends were observed. For instance, (BDI)SnOR only reacts with highly activated aliphatic electrophiles such as methyl triflate, but reacts reversibly with carbon dioxide. Both the rate of reaction and the degree of reversibility is dependent upon minor changes in the alkoxide ligand, with the bulkier tert-butoxide ligand displaying slower reactivity than the corresponding isopropyl ligand, although the latter system is a more exergonic reaction. Density Function Theory (DFT) calculations show that the differences in the reversibility of carbon dioxide insertion can be attributed to the ground-state energy differences of tin alkoxides while the rate of reaction is attributed to relative bond strengths of the Sn-O bonds. The mechanism of carbon dioxide insertion is discussed.
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Affiliation(s)
- Lorenzo Ferro
- Department of Chemistry, University of Sussex, Falmer, Brighton BN1 9QJ, UK
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35
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Vicente J, Abad JA, López-Sáez MJ, Jones P, Bautista D. Reactivity ofortho-Substituted ArylâPalladium Complexes towards Carbodiimides, Isothiocyanates, Nitriles, and Cyanamides. Chemistry 2010; 16:661-76. [DOI: 10.1002/chem.200901828] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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36
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Chen Y, Peng Y, Chen P, Zhao J, Liu L, Li Y, Chen S, Qu J. Insertion reactions of CS2, COS, and PhNCS at thiolate-bridged diiron centers. Dalton Trans 2010; 39:3020-5. [DOI: 10.1039/b920144k] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Tam ECY, Johnstone NC, Ferro L, Hitchcock PB, Fulton JR. Carbon dioxide activation by "non-nucleophilic" lead alkoxides. Inorg Chem 2009; 48:8971-6. [PMID: 19697938 DOI: 10.1021/ic900134f] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
A series of terminal lead alkoxides have been synthesized utilizing the bulky beta-diketiminate ligand [{N(2,6-(i)Pr(2)C(6)H(3))C(Me)}(2)CH](-) (BDI). The nucleophilicities of these alkoxides have been examined, and unexpected trends were observed. For instance, (BDI)PbOR reacts with methyl iodide only under forcing conditions yet reacts readily, but reversibly, with carbon dioxide. The degree of reversibility is strongly dependent upon minor changes in the R group. For instance, when R = isopropyl, the reversibility is only observed when the resulting alkyl carbonate is treated with other heterocumulenes; however, when R = tert-butyl, the reversibility is apparent upon any application of reduced pressure to the corresponding alkyl carbonate. The differences in the reversibility of carbon dioxide insertion are attributed to the ground-state energy differences of lead alkoxides. The mechanism of carbon dioxide insertion is discussed.
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Affiliation(s)
- Eric C Y Tam
- Department of Chemistry, University of Sussex, Falmer, Brighton BN1 9QJ, UK
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38
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Matas I, Cámpora J, Palma P, Álvarez E. Decomposition of Methylnickel(II) Amido, Alkoxo, and Alkyl Complexes by β-Hydrogen Elimination: A Comparative Study. Organometallics 2009. [DOI: 10.1021/om900400s] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Inmaculada Matas
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, c/ Américo Vespucio, 49, 41092, Sevilla, Spain
| | - Juan Cámpora
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, c/ Américo Vespucio, 49, 41092, Sevilla, Spain
| | - Pilar Palma
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, c/ Américo Vespucio, 49, 41092, Sevilla, Spain
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas, CSIC-Universidad de Sevilla, c/ Américo Vespucio, 49, 41092, Sevilla, Spain
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39
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Sun Y, Zhang Z, Wang X, Li X, Weng L, Zhou X. Lanthanide-Induced Diinsertion of Isocyanates into the N−H Bond: Synthesis, Structure, and Reactivity of Organolanthanides Containing Diureido Ligands. Organometallics 2009. [DOI: 10.1021/om900631j] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yan Sun
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Zhengxing Zhang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Xu Wang
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Xiaoqing Li
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Linhong Weng
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China
| | - Xigeng Zhou
- Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Fudan University, Shanghai 200433, People's Republic of China
- State Key Laboratory of Organometallic Chemistry, Shanghai 200032, People's Republic of China
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40
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Homogeneous hydrogenation of fluoroaromatic imines with Ni compounds, evidence for η2-CN intermediate in the catalytic cycle. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.molcata.2008.10.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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41
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Li J, Song H, Cui C, Cheng JP. Synthesis and Characterization of Linear and Square-Planar Nickel Complexes with Primary Amido Ligands. Inorg Chem 2008; 47:3468-70. [DOI: 10.1021/ic800288x] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jianfeng Li
- State Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Haibin Song
- State Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Chunming Cui
- State Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
| | - Jin-Pei Cheng
- State Key Laboratory of Elemento-organic Chemistry, Nankai University, Tianjin 300071, People’s Republic of China
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42
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Sit MM, Chan HS, Xie Z. Synthesis, structure, and reactivity of Group 4 metallacycles incorporating a Me2C-linked cyclopentadienyl-carboranyl ligand. Dalton Trans 2008:1454-64. [DOI: 10.1039/b716929a] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Cámpora J, Matas I, Palma P, Álvarez E, Graiff C, Tiripicchio A. Acid−Base Reactions of Methylnickel Hydroxo, Alkoxo, and Amide Complexes with Carbon Acids. Studies on the Reactivity of Noncyclic Nickel Enolates. Organometallics 2007. [DOI: 10.1021/om7007259] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Juan Cámpora
- Instituto de Investigaciones Químicas, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain, and Dipartamento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, Via G. P. Usberti 17/A, I-43100 Parma, Italy
| | - Inmaculada Matas
- Instituto de Investigaciones Químicas, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain, and Dipartamento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, Via G. P. Usberti 17/A, I-43100 Parma, Italy
| | - Pilar Palma
- Instituto de Investigaciones Químicas, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain, and Dipartamento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, Via G. P. Usberti 17/A, I-43100 Parma, Italy
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain, and Dipartamento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, Via G. P. Usberti 17/A, I-43100 Parma, Italy
| | - Claudia Graiff
- Instituto de Investigaciones Químicas, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain, and Dipartamento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, Via G. P. Usberti 17/A, I-43100 Parma, Italy
| | - Antonio Tiripicchio
- Instituto de Investigaciones Químicas, Consejo Superior de Investigaciones Científicas-Universidad de Sevilla, Avenida Américo Vespucio 49, 41092 Sevilla, Spain, and Dipartamento di Chimica Generale ed Inorganica, Chimica Analitica, Chimica Fisica, Università di Parma, Via G. P. Usberti 17/A, I-43100 Parma, Italy
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