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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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Chatchaipaiboon K, Nomura K. (Arylimido)niobium(V)–Alkylidenes as the Catalysts for Ring-Opening Metathesis Polymerization (ROMP) of Cyclic Olefins: Z-Specific ROMP of Cyclooctene by Nb(CHSiMe 3)(NC 6H 5)[OC(CF 3) 3](PMe 3) 2. Organometallics 2023. [DOI: 10.1021/acs.organomet.2c00665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Affiliation(s)
- Kanchana Chatchaipaiboon
- Department of Chemistry, Tokyo Metropolitan University, 1-1 minami Osawa, Hachioji, Tokyo 192-0927, Japan
| | - Kotohiro Nomura
- Department of Chemistry, Tokyo Metropolitan University, 1-1 minami Osawa, Hachioji, Tokyo 192-0927, Japan
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Quach PK, Hsu JH, Keresztes I, Fors BP, Lambert TH. Metal-Free Ring-Opening Metathesis Polymerization with Hydrazonium Initiators. Angew Chem Int Ed Engl 2022; 61:e202203344. [PMID: 35302707 DOI: 10.1002/anie.202203344] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2022] [Indexed: 12/13/2022]
Abstract
The ring-opening metathesis polymerization (ROMP) of cyclopropenes using hydrazonium initiators is described. The initiators, which are formed by the condensation of 2,3-diazabicyclo[2.2.2]octane and an aldehyde, polymerize cyclopropene monomers by a sequence of [3+2] cycloaddition and cycloreversion reactions. This process generates short chain polyolefins (Mn ≤9.4 kg mol-1 ) with relatively low dispersities (Đ≤1.4). The optimized conditions showed efficiency comparable to that achieved with Grubbs' 2nd generation catalyst for the polymerization of 3-methyl-3-phenylcyclopropene. A positive correlation between monomer to initiator ratio and degree of polymerization was revealed through NMR spectroscopy.
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Affiliation(s)
- Phong K Quach
- Department of Chemistry and Chemical Biology, Cornell University, 122 Baker Laboratory, Ithaca, NY 14853, USA
| | - Jesse H Hsu
- Department of Chemistry and Chemical Biology, Cornell University, 122 Baker Laboratory, Ithaca, NY 14853, USA
| | - Ivan Keresztes
- Department of Chemistry and Chemical Biology, Cornell University, 122 Baker Laboratory, Ithaca, NY 14853, USA
| | - Brett P Fors
- Department of Chemistry and Chemical Biology, Cornell University, 122 Baker Laboratory, Ithaca, NY 14853, USA
| | - Tristan H Lambert
- Department of Chemistry and Chemical Biology, Cornell University, 122 Baker Laboratory, Ithaca, NY 14853, USA
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Quach PK, Hsu JH, Keresztes I, Fors BP, Lambert TH. Metal–Free Ring–Opening Metathesis Polymerization with Hydrazonium Initiators. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202203344] [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)
- Phong K Quach
- Cornell University Chemistry and Chemical Biology 14853 Ithaca UNITED STATES
| | - Jesse H Hsu
- Cornell University Chemistry and Chemical Biology 14853 Ithaca UNITED STATES
| | - Ivan Keresztes
- Cornell University Chemistry and Chemical Biology 14853 Ithaca UNITED STATES
| | - Brett P Fors
- Cornell University Chemistry and Chemical Biology 14853 Ithaca UNITED STATES
| | - Tristan Hayes Lambert
- Cornell University Department of Chemistry & Chemical Biology Baker Laboratory 14853 Ithaca UNITED STATES
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Mandal U, Ghiviriga I, Abboud KA, Lester DW, Veige AS. Double Tethered Metallacyclobutane Catalyst for Cyclic Polymer Synthesis. J Am Chem Soc 2021; 143:17276-17283. [PMID: 34618432 DOI: 10.1021/jacs.1c08806] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This work outlines an approach to creating a catalyst for cyclic polymer synthesis using readily available materials in only one or two steps. Combining commercially available molybdenum-alkylidene 1 with two equivalents of ene-ol proligand 2 rapidly produces, in quantitative yield (1H NMR spectroscopy), the double tethered metallacyclobutane complex 3. Characterized by variable temperature NMR studies and nuclear Overhauser effect spectroscopy (NOESY) experiments, complex 3 exhibits fluxional behavior in solution. Determined by single crystal X-ray diffraction, the solid-state structure of complex 3 reveals metrical parameters indicating that the metallacyclobutane is not predicted to undergo rapid retro-cycloaddition. However, complex 3 is a precatalyst for the polymerization of norbornene to produce cyclic polynorbornene. An NMR spectrum of a test polymerization indicates that only a small fraction of the precatalyst is activated upon exposure to monomer. Quantifying the active catalyst is possible by measuring vinyl resonances that appear in the 1H NMR spectrum. The vinyl resonances are attributable to the release of one of the tethers upon norbornene addition. Confirmation of the polymer cyclic topology comes from gel permeation chromatography (GPC), dynamic light scattering (DLS), and intrinsic viscosity (η) measurements. The double tethered metallacyclobutane complex is a novel design for catalytic cyclic polymer synthesis. The synthetic approach suggests that catalyst tuning is possible by a choice of the commercial alkylidene and alteration of the ene-ol proligand.
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Affiliation(s)
- Ushnish Mandal
- Department of Chemistry, Center for Catalysis, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Ion Ghiviriga
- Department of Chemistry, Center for NMR Spectroscopy, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Khalil A Abboud
- Department of Chemistry, Center for Catalysis, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Daniel W Lester
- Polymer Characterization Research Technology Platform, University of Warwick, Coventry CV4 7AL, United Kingdom
| | - Adam S Veige
- Department of Chemistry, Center for Catalysis, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
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Belov DS, Mathivathanan L, Beazley MJ, Martin WB, Bukhryakov KV. Stereospecific Ring‐Opening Metathesis Polymerization of Norbornene Catalyzed by Iron Complexes. Angew Chem Int Ed Engl 2020; 60:2934-2938. [DOI: 10.1002/anie.202011150] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2020] [Revised: 10/27/2020] [Indexed: 11/07/2022]
Affiliation(s)
- Dmitry S. Belov
- Department of Chemistry and Biochemistry Florida International University 11200 SW 8th St. Miami FL 33199 USA
| | - Logesh Mathivathanan
- Department of Chemistry and Biochemistry Florida International University 11200 SW 8th St. Miami FL 33199 USA
| | - Melanie J. Beazley
- Department of Chemistry University of Central Florida 4111 Libra Dr. Orlando FL 32816 USA
| | - William Blake Martin
- Department of Macromolecular Science and Engineering Case Western Reserve University 2100 Adelbert Road Cleveland OH 44106 USA
| | - Konstantin V. Bukhryakov
- Department of Chemistry and Biochemistry Florida International University 11200 SW 8th St. Miami FL 33199 USA
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Belov DS, Mathivathanan L, Beazley MJ, Martin WB, Bukhryakov KV. Stereospecific Ring‐Opening Metathesis Polymerization of Norbornene Catalyzed by Iron Complexes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202011150] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Dmitry S. Belov
- Department of Chemistry and Biochemistry Florida International University 11200 SW 8th St. Miami FL 33199 USA
| | - Logesh Mathivathanan
- Department of Chemistry and Biochemistry Florida International University 11200 SW 8th St. Miami FL 33199 USA
| | - Melanie J. Beazley
- Department of Chemistry University of Central Florida 4111 Libra Dr. Orlando FL 32816 USA
| | - William Blake Martin
- Department of Macromolecular Science and Engineering Case Western Reserve University 2100 Adelbert Road Cleveland OH 44106 USA
| | - Konstantin V. Bukhryakov
- Department of Chemistry and Biochemistry Florida International University 11200 SW 8th St. Miami FL 33199 USA
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Izawa I, Nomura K. (Arylimido)niobium(V)–Alkylidenes, Nb(CHSiMe 3)(NAr)[OC(CF 3) 3](PMe 3) 2, That Enable to Proceed Living Metathesis Polymerization of Internal Alkynes. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c00874] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Itsuki Izawa
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 minami Osawa, Hachioji, Tokyo 192-0397, Japan
| | - Kotohiro Nomura
- Department of Chemistry, Graduate School of Science, Tokyo Metropolitan University, 1-1 minami Osawa, Hachioji, Tokyo 192-0397, Japan
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Nomura K, Chaimongkolkunasin S. cis-Specific ring opening metathesis polymerisation (ROMP) of cyclic olefins using (pentafluorophenylimido)vanadium(v)-alkylidene, V(CHSiMe3)(NC6F5)[OC(CF3)3](PMe3)2. Catal Sci Technol 2020. [DOI: 10.1039/d0cy00938e] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Highly cis-specific (Z selective) ring opening metathesis polymerisation of cycloheptene has been demonstrated using V(CHSiMe3)(NC6F5)[OC(CF3)3](PMe3)2.
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Affiliation(s)
- Kotohiro Nomura
- Department of Chemistry
- Tokyo Metropolitan University
- Tokyo 192-0397
- Japan
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Fuji M, Chiwata J, Ozaki M, Aratani S, Obora Y. In Situ-Generated Niobium-Catalyzed Synthesis of 3-Pyrroline Derivatives via Ring-Closing Metathesis Reactions. ACS OMEGA 2018; 3:8865-8873. [PMID: 31459018 PMCID: PMC6644540 DOI: 10.1021/acsomega.8b01642] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 07/30/2018] [Indexed: 05/15/2023]
Abstract
An active in situ-generated Nb complex was used as a catalyst in the ring-closing metathesis reaction of N,N-diallyl-p-toluenesulfonamide to afford the corresponding 3-pyrroline derivative. The Nb complex was formed from NbCl5, trimethylsilyl chloride, Zn, and PhCHCl2 in tetrahydrofuran. The Nb complex displayed high catalytic activity toward ring-closing metathesis reactions.
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Affiliation(s)
- Peng Liu
- State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
| | - Chunjin Ai
- State Key Laboratory of Applied Organic Chemistry and Key Laboratory of Nonferrous Metal Chemistry and Resources Utilization of Gansu Province, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou 730000, China
- Lanzhou Petrochemical Research Center, Petrochina, Lanzhou, 730060, China
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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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Synthesis and Reaction Chemistry of Alkylidene Complexes With Titanium, Zirconium, Vanadium, and Niobium: Effective Catalysts for Olefin Metathesis Polymerization and Other Organic Transformations. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2017. [DOI: 10.1016/bs.adomc.2017.08.001] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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