1
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Tomasini M, Gimferrer M, Caporaso L, Poater A. Rhenium Alkyne Catalysis: Sterics Control the Reactivity. Inorg Chem 2024; 63:5842-5851. [PMID: 38507560 PMCID: PMC10988556 DOI: 10.1021/acs.inorgchem.3c04235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 02/27/2024] [Accepted: 03/05/2024] [Indexed: 03/22/2024]
Abstract
Metathesis reactions, including alkane, alkene, and alkyne metatheses, have their origins in the fundamental understanding of chemical reactions and the development of specialized catalysts. These reactions stand as transformative pillars in organic chemistry, providing efficient rearrangement of carbon-carbon bonds and enabling synthetic access to diverse and complex compounds. Their impact spans industries such as petrochemicals, pharmaceuticals, and materials science. In this work, we present a detailed mechanistic study of the Re(V) catalyzed alkyne metathesis through density functional theory calculations. Our findings are in agreement with the experimental evidence from Jia and co-workers and unveil critical factors governing catalyst performance. Our work not only enhances our understanding of alkyne metathesis but also contributes to the broader landscape of catalytic processes, facilitating the design of more efficient and selective transformations in organic synthesis.
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Affiliation(s)
- Michele Tomasini
- Institut
de Química Computacional i Catàlisi, Departament de
Química, Universitat de Girona, c/Ma Aurèlia Capmany 69, Girona 17003, Catalonia, Spain
- Dipartimento
di Chimica e Biologia, Università
di Salerno, Via Ponte
don Melillo, Fisciano 84084, Italy
| | - Martí Gimferrer
- Institut
für Physikalische Chemie, Georg-August
Universität Göttingen, Tammannstraße 6, Göttingen 37077, Germany
| | - Lucia Caporaso
- Dipartimento
di Chimica e Biologia, Università
di Salerno, Via Ponte
don Melillo, Fisciano 84084, Italy
- CIRCC, Interuniversity Consortium Chemical Reactivity and Catalysis, via Celso Ulpiani 27, Bari 70126, Italy
| | - Albert Poater
- Institut
de Química Computacional i Catàlisi, Departament de
Química, Universitat de Girona, c/Ma Aurèlia Capmany 69, Girona 17003, Catalonia, Spain
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2
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Zhu QH, Zhang L, Zhang GH, Tao GH, Qin S, Chen H, Yuan WL, Wang YH, Jin Y, Ma L, He L, Zhang W. Promoting productive metathesis pathway and tuning activity of multidentate molybdenum catalysts in alkyne metathesis: A theoretical perspective. MOLECULAR CATALYSIS 2022. [DOI: 10.1016/j.mcat.2022.112696] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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3
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Cui M, Jia G. Organometallic Chemistry of Transition Metal Alkylidyne Complexes Centered at Metathesis Reactions. J Am Chem Soc 2022; 144:12546-12566. [PMID: 35793547 DOI: 10.1021/jacs.2c01192] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Transition metals form a variety of alkylidyne complexes with either a d0 metal center (high-valent) or a non-d0 metal center (low-valent). One of the most interesting properties of alkylidyne complexes is that they can undergo or mediate metathesis reactions. The most well-studied metathesis reactions are alkyne metathesis involving high-valent alkylidynes. High-valent alkylidynes can also undergo metathesis reactions with heterotriple bonded species such as N≡CR, P≡CR, and N≡NR+. Metathesis reactions involving low-valent alkylidynes are less known. Highly efficient alkyne metathesis catalysts have been developed based on Mo(VI) and W(VI) alkylidynes. Catalytic cross-metathesis of nitriles with alkynes has also been achieved with M(VI) (M = W, Mo) alkylidyne or nitrido complexes. The metathesis activity of alkylidyne complexes is sensitively dependent on metals, supporting ligands and substituents of alkylidynes. Beyond metathesis, metal alkylidynes can also promote other reactions including alkyne polymerization. The remaining shortcomings and opportunities in the field are assessed.
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Affiliation(s)
- Mingxu Cui
- Department of Chemistry, The Hong Kong University of Science and Technology, Kowloon, SAR, Hong Kong, China
| | - Guochen Jia
- Department of Chemistry, The Hong Kong University of Science and Technology, Kowloon, SAR, Hong Kong, China.,HKUST Shenzhen Research Institute, Shenzhen, 518057, China
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4
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Koneczny M, Erol AB, Mauduit M, Eisen MS, Tamm M. Titanium complexes with unsymmetrically substituted imidazolin-2-iminato ligands. Dalton Trans 2022; 51:11448-11456. [PMID: 35822511 DOI: 10.1039/d2dt01740g] [Citation(s) in RCA: 2] [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 unsymmetrical N-heterocyclic carbenes 1-(2,4,6-trimethylphenyl)-3-(adamantyl)imidazolin-2-ylidene (IAdMes, 1a) and 1-(2,6-diisopropylphenyl)-3-(adamantyl)imidazolin-2-ylidene (IAdDipp, 1b) with trimethylsilyl azide furnished the 2-(trimethylsilylimino)imidazolines 2a (ImAdMesNSiMe3) and 2b (ImAdDippNSiMe3). Desilylation by stirring in methanol gave the corresponding imidazolin-2-imines 3a (ImAdMesNH) and 3b (ImAdDippNH). 2a and 2b were treated with [TiCl4(THF)2] (THF = tetrahydrofuran) and [CpTiCl3] (Cp = η5-C5H5) to form the mono- and bis(imidazolin-2-iminato) titanium(IV) complexes [(ImAdRN)TiCl3] (4, R = Mes, Dipp), [Cp(ImAdRN)TiCl2] (5, R = Mes, Dipp), and [(ImAdRN)2TiCl2] (6, R = Mes, Dipp). The crystal structures of all compounds except 2b were determined by X-ray diffraction analysis.
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Affiliation(s)
- Marvin Koneczny
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Brauschweig, Germany.
| | - Arife Büsra Erol
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Brauschweig, Germany.
| | - Marc Mauduit
- Univ Rennes, Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR-UMR 6226, F-35000 Rennes, France
| | - Moris S Eisen
- Schulich Faculty of Chemistry, Technion - Israel Institute of Technology, Technion City, 32000 Haifa, Israel
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Brauschweig, Germany.
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5
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Groos J, Koy M, Musso J, Neuwirt M, Pham T, Hauser PM, Frey W, Buchmeiser MR. Ligand Variations in Neutral and Cationic Molybdenum Alkylidyne NHC Catalysts. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Cui M, Sung HHY, Williams ID, Jia G. Alkyne Metathesis with d 2 Re(V) Alkylidyne Complexes Supported by Phosphino-Phenolates: Ligand Effect on Catalytic Activity and Applications in Ring-Closing Alkyne Metathesis. J Am Chem Soc 2022; 144:6349-6360. [PMID: 35377156 DOI: 10.1021/jacs.2c00368] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A family of d2 Re(V) alkylidyne complexes bearing two decorated phosphino-phenolates (POs) and a labile pyridine ligand were prepared that can efficiently promote alkyne metathesis reactions in toluene. The relative activity of these complexes varies with the PO ligands. Complexes with an electron-rich metal center have a higher activity. Ligand exchange experiments suggest that the pyridine ligands of the Re(V) alkylidynes with more electron-donating PO ligands are more labile and are more easily released to generate catalytically active species. However, complexes with electron-withdrawing PO ligands are more air-stable than those with electron-donating PO ligands. These Re(V) alkylidyne catalysts can promote the homometathesis of functionalized internal alkyl- and aryl-alkynes, as well as ring-closing alkyne metathesis (RCAM) of methyl-capped diynes, forming macrocycles with a ring size ≥12 efficiently for concentrations ≤5 mM. These reactions represent the first examples of RCAM mediated by non-d0 alkylidyne complexes. The Re(V) alkylidyne catalysts tolerate a wide range of functional groups including ethers, esters, ketones, aldehydes, alcohols, phenols, amines, amides, and heterocycles. Moreover, the catalytic RCAM reactions promoted by robust Re(V) alkylidyne catalysts could also proceed normally in wet toluene.
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Affiliation(s)
- Mingxu Cui
- Department of Chemistry, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, SAR 000000, China
| | - Herman H Y Sung
- Department of Chemistry, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, SAR 000000, China
| | - Ian D Williams
- Department of Chemistry, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, SAR 000000, China
| | - Guochen Jia
- Department of Chemistry, The Hong Kong University of Science and Technology, Kowloon, Hong Kong, SAR 000000, China.,HKUST Shenzhen Research Institute, Shenzhen 518057, China
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Ge Y, Hu Y, Duan G, Jin Y, Zhang W. Advances and challenges in user-friendly alkyne metathesis catalysts. TRENDS IN CHEMISTRY 2022. [DOI: 10.1016/j.trechm.2022.03.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Schulz S, Poth D, Peram PS, Hötling S, Menke M, Melnik K, Röpke R. Chemical Diversity of Volatile Macrocylic Lactones from Frogs. Synlett 2021. [DOI: 10.1055/a-1381-2881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AbstractFor a long time, frogs were believed to communicate primarily via the acoustic channel, but during the last decades it became obvious that various lineages also use chemical communication. In this Account we present our research on the identification of volatile lactones from Madagascan Mantellidae and African Hyperoliidae frogs. Both possess male specific glands that can disseminate a range of volatile compounds. Key constituents are macrocyclic lactones. They show high variability in structure and occurrence. We focus here on the synthetic approaches we have used to clarify constitution and configuration of the glandular compounds. Key synthetic methods are ring-closing metathesis and nucleophilic epoxide opening. Often, but not always, the natural compounds occurs in amounts that excludes their investigation by NMR spectroscopy. Instead, we use GC/MS analysis, GC/IR, microreactions, and synthesis to identify such components. Several aspects of our work will be described giving some insight in our scientific approach.1 Introduction2 Macrocylic Lactones from the Fatty Acid Biosynthetic Pathway3 Unsaturated Lactones4 Terpenoid Lactones5 Macrolide Occurrence6 Conclusions
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Abstract
![]()
For numerous enabling features and strategic virtues, contemporary
alkyne metathesis is increasingly recognized as a formidable synthetic
tool. Central to this development was the remarkable evolution of
the catalysts during the past decades. Molybdenum alkylidynes carrying
(tripodal) silanolate ligands currently set the standards; their functional
group compatibility is exceptional, even though they comprise an early
transition metal in its highest oxidation state. Their performance
is manifested in case studies in the realm of dynamic covalent chemistry,
advanced applications to solid-phase synthesis, a revival of transannular
reactions, and the assembly of complex target molecules at sites,
which one may not intuitively trace back to an acetylenic ancestor.
In parallel with these innovations in material science and organic
synthesis, new insights into the mode of action of the most advanced
catalysts were gained by computational means and the use of unconventional
analytical tools such as 95Mo and 183W NMR spectroscopy.
The remaining shortcomings, gaps, and desiderata in the field are
also critically assessed.
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Affiliation(s)
- Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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10
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Zier ML, Colombel-Rouen S, Ehrhorn H, Bockfeld D, Trolez Y, Mauduit M, Tamm M. Catalytic Alkyne and Diyne Metathesis with Mixed Fluoroalkoxy-Siloxy Molybdenum Alkylidyne Complexes. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00290] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Manuel L. Zier
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Sophie Colombel-Rouen
- Univ Rennes; Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR−UMR 6226, F-35000 Rennes, France
| | - Henrike Ehrhorn
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Dirk Bockfeld
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Yann Trolez
- Univ Rennes; Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR−UMR 6226, F-35000 Rennes, France
| | - Marc Mauduit
- Univ Rennes; Ecole Nationale Supérieure de Chimie de Rennes, CNRS, ISCR−UMR 6226, F-35000 Rennes, France
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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11
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Groos J, Hauser PM, Koy M, Frey W, Buchmeiser MR. Highly Reactive Cationic Molybdenum Alkylidyne N-Heterocyclic Carbene Catalysts for Alkyne Metathesis. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00175] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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12
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Synthesis of Alkyne Metathesis Catalysts from Tris(dimethylamido)tungsten Precursors. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000835] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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13
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Hillenbrand J, van Gastel M, Bill E, Neese F, Fürstner A. Isolation of a Homoleptic Non-oxo Mo(V) Alkoxide Complex: Synthesis, Structure, and Electronic Properties of Penta- tert-Butoxymolybdenum. J Am Chem Soc 2020; 142:16392-16402. [PMID: 32847348 PMCID: PMC7517713 DOI: 10.1021/jacs.0c07073] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Treatment of [MoCl4(THF)2] with MOtBu (M = Na, Li) does not result in simple metathetic ligand exchange but entails disproportionation with formation of the well-known dinuclear complex [(tBuO)3Mo≡Mo(OtBu)3] and a new paramagnetic compound, [Mo(OtBu)5]. This particular five-coordinate species is the first monomeric, homoleptic, all-oxygen-ligated but non-oxo 4d1 Mo(V) complex known to date; as such, it proves that the dominance of the Mo═O group over (high-valent) molybdenum chemistry can be challenged. [Mo(OtBu)5] was characterized in detail by a combined experimental/computational approach using X-ray diffraction; UV/vis, MCD, IR, EPR, and NMR spectroscopy; and quantum chemistry. The recorded data confirm a Jahn-Teller distortion of the structure, as befitting a d1 species, and show that the complex undergoes Berry pseudorotation. The alkoxide ligands render the disproportionation reaction, leading the formation of [Mo(OtBu)5] to be particularly facile, even though the parent complex [MoCl4(THF)2] itself was also found to be intrinsically unstable; remarkably, this substrate converts into a crystalline material, in which the newly formed Mo(III) and Mo(V) products cohabitate the same unit cell.
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Affiliation(s)
| | | | - Eckhard Bill
- Max-Planck-Institute for Chemical Energy Conversion, 45470 Mülheim/Ruhr, Germany
| | - Frank Neese
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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Cui M, Bai W, Sung HHY, Williams ID, Jia G. Robust Alkyne Metathesis Catalyzed by Air Stable d2 Re(V) Alkylidyne Complexes. J Am Chem Soc 2020; 142:13339-13344. [DOI: 10.1021/jacs.0c06581] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Mingxu Cui
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Wei Bai
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Herman H. Y. Sung
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Ian D. Williams
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Guochen Jia
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
- HKUST Shenzhen Research Institute, Shenzhen 518057, China
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Benedikter MJ, Ziegler F, Groos J, Hauser PM, Schowner R, Buchmeiser MR. Group 6 metal alkylidene and alkylidyne N-heterocyclic carbene complexes for olefin and alkyne metathesis. Coord Chem Rev 2020. [DOI: 10.1016/j.ccr.2020.213315] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
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16
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Hauser PM, Ende M, Groos J, Frey W, Wang D, Buchmeiser MR. Cationic Tungsten Alkylidyne
N
‐Heterocyclic Carbene Complexes: Synthesis and Reactivity in Alkyne Metathesis. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000503] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Philipp M. Hauser
- Institute of Polymer Chemistry University of Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Melita Ende
- Institute of Polymer Chemistry University of Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Jonas Groos
- Institute of Polymer Chemistry University of Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Wolfgang Frey
- Institute of Organic Chemistry University of Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Dongren Wang
- Institute of Polymer Chemistry University of Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Michael R. Buchmeiser
- Institute of Polymer Chemistry University of Stuttgart Pfaffenwaldring 55 70569 Stuttgart Germany
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17
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Goettel JT, Gao H, Dotzauer S, Braunschweig H. Me CAAC=N - : A Cyclic (Alkyl)(Amino)Carbene Imino Ligand. Chemistry 2020; 26:1136-1143. [PMID: 31777982 PMCID: PMC7027825 DOI: 10.1002/chem.201904715] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Indexed: 12/27/2022]
Abstract
A cyclic (alkyl)(amino)carbene (CAAC) has been shown to react with a covalent azide similar to the Staudinger reaction. The reaction of Me CAAC with trimethylsilyl azide afforded the N-silylated 2-iminopyrrolidine (Me CAAC=NSiMe3 ), which was fully characterized. This compound undergoes hydrolysis to afford the 2-iminopyrrolidine and trimethylsiloxane which co-crystallize as a hydrogen-bonded adduct. The N-silylated 2-iminopyrrolidine was used to transfer the novel pyrrolidine-2-iminato ligand onto both main-group and transition-metal centers. The reaction of the tetrabromodiborane bis(dimethyl sulfide) adduct with two equivalents of Me CAAC=NSiMe3 afforded the disubstituted diborane. The reaction of Me CAAC=NSiMe3 with TiCl4 and CpTiCl3 afforded Me CAAC=NTiCl3 and Me CAAC=NTiCl2 Cp, respectively.
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Affiliation(s)
- James T. Goettel
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Haopeng Gao
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Simon Dotzauer
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Holger Braunschweig
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
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18
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Thompson RR, Rotella ME, Du P, Zhou X, Fronczek FR, Kumar R, Gutierrez O, Lee S. Siloxide Podand Ligand as a Scaffold for Molybdenum-Catalyzed Alkyne Metathesis and Isolation of a Dynamic Metallatetrahedrane Intermediate. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00430] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Richard R. Thompson
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70810, United States
| | - Madeline E. Rotella
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Pu Du
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70810, United States
| | - Xin Zhou
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70810, United States
| | - Frank R. Fronczek
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70810, United States
| | - Revati Kumar
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70810, United States
| | - Osvaldo Gutierrez
- Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, United States
| | - Semin Lee
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70810, United States
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19
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Elser I, Groos J, Hauser PM, Koy M, van der Ende M, Wang D, Frey W, Wurst K, Meisner J, Ziegler F, Kästner J, Buchmeiser MR. Molybdenum and Tungsten Alkylidyne Complexes Containing Mono-, Bi-, and Tridentate N-Heterocyclic Carbenes. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00481] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
| | | | | | | | | | | | | | - Klaus Wurst
- Institute of General, Inorganic and Theoretical Chemistry, University of Innsbruck, A-6020 Innsbruck, Austria
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Doddi A, Peters M, Tamm M. N-Heterocyclic Carbene Adducts of Main Group Elements and Their Use as Ligands in Transition Metal Chemistry. Chem Rev 2019; 119:6994-7112. [PMID: 30983327 DOI: 10.1021/acs.chemrev.8b00791] [Citation(s) in RCA: 302] [Impact Index Per Article: 60.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
N-Heterocyclic carbenes (NHC) are nowadays ubiquitous and indispensable in many research fields, and it is not possible to imagine modern transition metal and main group element chemistry without the plethora of available NHCs with tailor-made electronic and steric properties. While their suitability to act as strong ligands toward transition metals has led to numerous applications of NHC complexes in homogeneous catalysis, their strong σ-donating and adaptable π-accepting abilities have also contributed to an impressive vitalization of main group chemistry with the isolation and characterization of NHC adducts of almost any element. Formally, NHC coordination to Lewis acids affords a transfer of nucleophilicity from the carbene carbon atom to the attached exocyclic moiety, and low-valent and low-coordinate adducts of the p-block elements with available lone pairs and/or polarized carbon-element π-bonds are able to act themselves as Lewis basic donor ligands toward transition metals. Accordingly, the availability of a large number of novel NHC adducts has not only produced new varieties of already existing ligand classes but has also allowed establishment of numerous complexes with unusual and often unprecedented element-metal bonds. This review aims at summarizing this development comprehensively and covers the usage of N-heterocyclic carbene adducts of the p-block elements as ligands in transition metal chemistry.
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Affiliation(s)
- Adinarayana Doddi
- Technische Universität Braunschweig, Institut für Anorganische und Analytische Chemie, Hagenring 30, 38106 Braunschweig, Germany
| | - Marius Peters
- Technische Universität Braunschweig, Institut für Anorganische und Analytische Chemie, Hagenring 30, 38106 Braunschweig, Germany
| | - Matthias Tamm
- Technische Universität Braunschweig, Institut für Anorganische und Analytische Chemie, Hagenring 30, 38106 Braunschweig, Germany
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21
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Ehrhorn H, Bockfeld D, Freytag M, Bannenberg T, Kefalidis CE, Maron L, Tamm M. Studies on Molybdena- and Tungstenacyclobutadiene Complexes Supported by Fluoroalkoxy Ligands as Intermediates of Alkyne Metathesis. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00068] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Henrike Ehrhorn
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Dirk Bockfeld
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Matthias Freytag
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Christos E. Kefalidis
- Institut National des Sciences Appliquées, Université de Toulouse, CNRS, INSA, UPS, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Laurent Maron
- Institut National des Sciences Appliquées, Université de Toulouse, CNRS, INSA, UPS, 135 Avenue de Rangueil, 31077 Toulouse, France
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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22
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Peters M, Bannenberg T, Bockfeld D, Tamm M. Pentamethylcyclopentadienyl ruthenium “pogo stick” complexes with nitrogen donor ligands. Dalton Trans 2019; 48:4228-4238. [DOI: 10.1039/c9dt00577c] [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
The preparation and reactivity of an imidazolin-2-iminato ruthenium complex with a rare one-legged piano-stool (“pogo stick”) geometry is reported.
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Affiliation(s)
- Marius Peters
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Dirk Bockfeld
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
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23
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Naktode K, Das S, Nayek HP, Panda TK. Reactivity of titanium imidazolin-2-iminato complexes with 2,6-diisopropylaniline and 2-{(2,6-diisopropylphenyl)-iminomethyl}pyrrole. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1544705] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Kishor Naktode
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, India
- Department of Chemistry, Nevjabai Hitkarini College Bramhapuri, Chandrapur, India
| | - Suman Das
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, India
| | - Hari Pada Nayek
- Department of Applied Chemistry, Indian Institute of Technology (ISM), Dhanbad, India
| | - Tarun K. Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad, Kandi, Sangareddy, India
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24
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Ehrhorn H, Tamm M. Well-Defined Alkyne Metathesis Catalysts: Developments and Recent Applications. Chemistry 2018; 25:3190-3208. [PMID: 30346054 DOI: 10.1002/chem.201804511] [Citation(s) in RCA: 60] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2018] [Indexed: 12/31/2022]
Abstract
Although alkyne metathesis has been known for 50 years, rapid progress in this field has mostly occurred during the last two decades. In this article, the development of several highly efficient and thoroughly studied alkyne metathesis catalysts is reviewed, which includes novel well-defined, in situ formed and heterogeneous systems. Various alkyne metathesis methodologies, including alkyne cross-metathesis (ACM), ring-closing alkyne metathesis (RCAM), cyclooligomerization, acyclic diyne metathesis polymerization (ADIMET), and ring-opening alkyne metathesis polymerization (ROAMP), are presented, and their application in natural product synthesis, materials science as well as supramolecular and polymer chemistry is discussed. Recent progress in the metathesis of diynes is also summarized, which gave rise to new methods such as ring-closing diyne metathesis (RCDM) and diyne cross-metathesis (DYCM).
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Affiliation(s)
- Henrike Ehrhorn
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106, Braunschweig, Germany
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25
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Àrias Ò, Ehrhorn H, Härdter J, Jones PG, Tamm M. Synthesis of Ether-Functionalized and Sterically Demanding Molybdenum Alkylidyne Complexes. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00783] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Òscar Àrias
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany
| | - Henrike Ehrhorn
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany
| | - Johanna Härdter
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, D-38106 Braunschweig, Germany
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26
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Roland CD, VenkatRamani S, Jakhar VK, Ghiviriga I, Abboud KA, Veige AS. Synthesis and Characterization of a Molybdenum Alkylidyne Supported by a Trianionic OCO3– Pincer Ligand. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00677] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christopher D. Roland
- Center for Catalysis, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Sudarsan VenkatRamani
- Center for Catalysis, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Vineet K. Jakhar
- Center for Catalysis, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Ion Ghiviriga
- Center for Catalysis, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Khalil A. Abboud
- Center for Catalysis, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
| | - Adam S. Veige
- Center for Catalysis, University of Florida, P.O. Box 117200, Gainesville, Florida 32611, United States
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27
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Zhai F, Bukhryakov KV, Schrock RR, Hoveyda AH, Tsay C, Müller P. Syntheses of Molybdenum Oxo Benzylidene Complexes. J Am Chem Soc 2018; 140:13609-13613. [PMID: 30296371 DOI: 10.1021/jacs.8b09616] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reaction between Mo(O)(CHAro)(ORF6)2(PMe3) (Aro = ortho-methoxyphenyl, ORF6 = OCMe(CF3)2) and 2 equiv of LiOHMT (OHMT = O-2,6-(2,4,6-Me3C6H2)2C6H3) leads to Mo(O)(CHAro)(OHMT)2, an X-ray structure of which shows it to be a trigonal bipyramidal anti benzylidene complex in which the o-methoxy oxygen is coordinated to the metal trans to the apical oxo ligand. Addition of 1 equiv of water (in THF) to the benzylidyne complex, Mo(CArp)(OR)3(THF)2 (Arp = para-methoxyphenyl, OR = ORF6 or OC(CF3)3 (ORF9)) leads to formation of {Mo(CArp)(OR)2(μ-OH)(THF)}2(μ-THF) complexes. Addition of 1 equiv of a phosphine (L) to Mo(CArp)(ORF9)3(THF)2 in THF, followed by addition of 1 equiv of water, all at room temperature, yields Mo(O)(CHArp)(ORF9)2(L) complexes in good yields for several phosphines (e.g., PMe2Ph (69% by NMR), PMePh2 (59%), PEt3 (69%), or P( i-Pr)3 (65%)). The reaction between Mo(O)(CHArp)(ORF9)2(PEt3) and 2 equiv of LiOHMT proceeds smoothly at 90 °C in toluene to give Mo(O)(CHArp)(OHMT)2, a four-coordinate syn alkylidene complex. Mo(O)(CHArp)(OHMT)2 reacts with ethylene (1 atm in C6D6) to give (in solution) a mixture of Mo(O)(CHArp)(OHMT)2, Mo(O)(CH2)(OHMT)2, and an unsubstituted square pyramidal metallacyclobutane complex, Mo(O)(CH2CH2CH2)(OHMT)2, along with ethylene and ArpCH═CH2. Mo(O)(CHArp)(OHMT)2 also reacts with 2,3-dicarbomethoxynorbornadiene to yield syn and anti isomers of the "first-insertion" products that contain a cis C═C bond.
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Affiliation(s)
- Feng Zhai
- Department of Chemistry 6-331 , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Konstantin V Bukhryakov
- Department of Chemistry 6-331 , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Richard R Schrock
- Department of Chemistry 6-331 , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Amir H Hoveyda
- Department of Chemistry, Merkert Chemistry Center , Boston College , Chestnut Hill , Massachusetts 02467 , United States
| | - Charlene Tsay
- Department of Chemistry 6-331 , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
| | - Peter Müller
- Department of Chemistry 6-331 , Massachusetts Institute of Technology , Cambridge , Massachusetts 02139 , United States
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28
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Ehrhorn H, Schlösser J, Bockfeld D, Tamm M. Efficient catalytic alkyne metathesis with a fluoroalkoxy-supported ditungsten(III) complex. Beilstein J Org Chem 2018; 14:2425-2434. [PMID: 30344767 PMCID: PMC6178283 DOI: 10.3762/bjoc.14.220] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2018] [Accepted: 08/27/2018] [Indexed: 02/06/2023] Open
Abstract
The molybdenum and tungsten complexes M2(OR)6 (Mo2F6, M = Mo, R = C(CF3)2Me; W2F3, M = W, R = OC(CF3)Me2) were synthesized as bimetallic congeners of the highly active alkyne metathesis catalysts [MesC≡M{OC(CF3)nMe3−n}] (MoF6, M = Mo, n = 2; WF3, M = W, n = 1; Mes = 2,4,6-trimethylphenyl). The corresponding benzylidyne complex [PhC≡W{OC(CF3)Me2}] (WPhF3) was prepared by cleaving the W≡W bond in W2F3 with 1-phenyl-1-propyne. The catalytic alkyne metathesis activity of these metal complexes was determined in the self-metathesis, ring-closing alkyne metathesis and cross-metathesis of internal and terminal alkynes, revealing an almost equally high metathesis activity for the bimetallic tungsten complex W2F3 and the alkylidyne complex WPhF3. In contrast, Mo2F6 displayed no significant activity in alkyne metathesis.
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Affiliation(s)
- Henrike Ehrhorn
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Janin Schlösser
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Dirk Bockfeld
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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29
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Schnabel TM, Melcher D, Brandhorst K, Bockfeld D, Tamm M. Unraveling the Mechanism of 1,3-Diyne Cross-Metathesis Catalyzed by Silanolate-Supported Tungsten Alkylidyne Complexes. Chemistry 2018; 24:9022-9032. [PMID: 29676817 DOI: 10.1002/chem.201801651] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Indexed: 02/05/2023]
Affiliation(s)
- Tobias M. Schnabel
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Daniel Melcher
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Kai Brandhorst
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Dirk Bockfeld
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
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30
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Hauser PM, Hunger M, Buchmeiser MR. Silica-Supported Molybdenum Alkylidyne N-Heterocyclic Carbene Catalysts: Relevance of Site Isolation to Catalytic Performance. ChemCatChem 2018. [DOI: 10.1002/cctc.201701654] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Philipp M. Hauser
- Institute of Polymer Chemistry; University of Stuttgart; Pfaffenwaldring 55 D-70569 Stuttgart Germany
| | - Michael Hunger
- Institute of Chemical Technology; University of Stuttgart; Pfaffenwaldring 55 D-70569 Stuttgart Germany
| | - Michael R. Buchmeiser
- Institute of Polymer Chemistry; University of Stuttgart; Pfaffenwaldring 55 D-70569 Stuttgart Germany
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31
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Bai W, Wei W, Sung HHY, Williams ID, Lin Z, Jia G. Syntheses of Re(V) Alkylidyne Complexes and Ligand Effect on the Reactivity of Re(V) Alkylidyne Complexes toward Alkynes. Organometallics 2018. [DOI: 10.1021/acs.organomet.7b00877] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Wei Bai
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Wei Wei
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Herman H. Y. Sung
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Ian D. Williams
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Zhenyang Lin
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
| | - Guochen Jia
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, China
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32
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Estes DP, Gordon CP, Fedorov A, Liao WC, Ehrhorn H, Bittner C, Zier ML, Bockfeld D, Chan KW, Eisenstein O, Raynaud C, Tamm M, Copéret C. Molecular and Silica-Supported Molybdenum Alkyne Metathesis Catalysts: Influence of Electronics and Dynamics on Activity Revealed by Kinetics, Solid-State NMR, and Chemical Shift Analysis. J Am Chem Soc 2017; 139:17597-17607. [DOI: 10.1021/jacs.7b09934] [Citation(s) in RCA: 71] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Deven P. Estes
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, 8093 Zürich, Switzerland
| | - Christopher P. Gordon
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, 8093 Zürich, Switzerland
| | - Alexey Fedorov
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, 8093 Zürich, Switzerland
| | - Wei-Chih Liao
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, 8093 Zürich, Switzerland
| | - Henrike Ehrhorn
- Institut
für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Celine Bittner
- Institut
für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Manuel Luca Zier
- Institut
für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Dirk Bockfeld
- Institut
für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Ka Wing Chan
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, 8093 Zürich, Switzerland
| | - Odile Eisenstein
- Institut
Charles Gerhardt, UMR 5253 CNRS-UM-ENSCM, Université de Montpellier, Place E. Bataillon, F-34095 Montpellier, France
- Hylleraas
Centre for Quantum Molecular Sciences, Department of Chemistry, University of Oslo, P.O. Box 1033, Blindern, 0315 Oslo, Norway
| | - Christophe Raynaud
- Institut
Charles Gerhardt, UMR 5253 CNRS-UM-ENSCM, Université de Montpellier, Place E. Bataillon, F-34095 Montpellier, France
| | - Matthias Tamm
- Institut
für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Christophe Copéret
- Department
of Chemistry and Applied Biosciences, ETH Zürich, Vladimir-Prelog-Weg 1-5, 8093 Zürich, Switzerland
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33
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Koy M, Elser I, Meisner J, Frey W, Wurst K, Kästner J, Buchmeiser MR. High Oxidation State Molybdenum N
-Heterocyclic Carbene Alkylidyne Complexes: Synthesis, Mechanistic Studies, and Reactivity. Chemistry 2017; 23:15484-15490. [DOI: 10.1002/chem.201703313] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2017] [Indexed: 12/26/2022]
Affiliation(s)
- Maximilian Koy
- Universität Stuttgart; Institut für Polymerchemie; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Iris Elser
- Universität Stuttgart; Institut für Polymerchemie; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Jan Meisner
- Universität Stuttgart; Institut für Theoretische Chemie; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Wolfgang Frey
- Universität Stuttgart; Institut für Organische Chemie; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Klaus Wurst
- Universität Innsbruck; Institut für Allgemeine, Anorganische und Theoretische Chemie; Innrain 80-82 6020 Innsbruck Austria
| | - Johannes Kästner
- Universität Stuttgart; Institut für Theoretische Chemie; Pfaffenwaldring 55 70569 Stuttgart Germany
| | - Michael R. Buchmeiser
- Universität Stuttgart; Institut für Polymerchemie; Pfaffenwaldring 55 70569 Stuttgart Germany
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34
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Schäfer PM, Fuchs M, Ohligschläger A, Rittinghaus R, McKeown P, Akin E, Schmidt M, Hoffmann A, Liauw MA, Jones MD, Herres-Pawlis S. Highly Active N,O Zinc Guanidine Catalysts for the Ring-Opening Polymerization of Lactide. CHEMSUSCHEM 2017; 10:3547-3556. [PMID: 28779508 DOI: 10.1002/cssc.201701237] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2017] [Revised: 08/04/2017] [Indexed: 06/07/2023]
Abstract
New zinc guanidine complexes with N,O donor functionalities were prepared, characterized by X-Ray crystallography, and examined for their catalytic activity in the solvent-free ring-opening polymerization (ROP) of technical-grade rac-lactide at 150 °C. All complexes showed a high activity. The fastest complex [ZnCl2 (DMEGasme)] (C1) produced colorless poly(lactide) (PLA) after 90 min with a conversion of 52 % and high molar masses (Mw =69 100, polydispersity=1.4). The complexes were tested with different monomer-to-initiator ratios to determine the rate constant kp . Furthermore, a polymerization with the most active complex C1 was monitored by in situ Raman spectroscopy. Overall, conversion of up to 90 % can be obtained. End-group analysis was performed to clarify the mechanism. All four complexes combine robustness against impurities in the lactide with high polymerization rates, and they represent the fastest robust lactide ROP catalysts to date, opening new avenues to a sustainable ROP catalyst family for industrial use.
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Affiliation(s)
- Pascal M Schäfer
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Martin Fuchs
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Andreas Ohligschläger
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany
| | - Ruth Rittinghaus
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Paul McKeown
- Department of Chemistry, University of Bath, ClavertonDown, Bath, BA2 7AY, UK
| | - Enver Akin
- Fakultät für Naturwissenschaften, Department Chemie, Universität Paderborn, Warburger Strasse 100, 33098, Paderborn, Germany
| | - Maximilian Schmidt
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Alexander Hoffmann
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
| | - Marcel A Liauw
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 1, 52074, Aachen, Germany
| | - Matthew D Jones
- Department of Chemistry, University of Bath, ClavertonDown, Bath, BA2 7AY, UK
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie, RWTH Aachen University, Landoltweg 1, 52074, Aachen, Germany
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35
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Bittner C, Ehrhorn H, Bockfeld D, Brandhorst K, Tamm M. Tuning the Catalytic Alkyne Metathesis Activity of Molybdenum and Tungsten 2,4,6-Trimethylbenzylidyne Complexes with Fluoroalkoxide Ligands OC(CF3)nMe3–n (n = 0–3). Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00519] [Citation(s) in RCA: 50] [Impact Index Per Article: 7.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Celine Bittner
- Institut für Anorganische
und Analytische Chemie, Technische Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
| | - Henrike Ehrhorn
- Institut für Anorganische
und Analytische Chemie, Technische Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
| | - Dirk Bockfeld
- Institut für Anorganische
und Analytische Chemie, Technische Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
| | - Kai Brandhorst
- Institut für Anorganische
und Analytische Chemie, Technische Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
| | - Matthias Tamm
- Institut für Anorganische
und Analytische Chemie, Technische Universität Braunschweig, Hagenring
30, 38106 Braunschweig, Germany
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36
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Peters M, Doddi A, Bannenberg T, Freytag M, Jones PG, Tamm M. N-Heterocyclic Carbene-Phosphinidene and Carbene-Phosphinidenide Transition Metal Complexes. Inorg Chem 2017; 56:10785-10793. [DOI: 10.1021/acs.inorgchem.7b01798] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Marius Peters
- Institut für Anorganische und Analytische
Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Adinarayana Doddi
- Institut für Anorganische und Analytische
Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische
Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Matthias Freytag
- Institut für Anorganische und Analytische
Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Peter G. Jones
- Institut für Anorganische und Analytische
Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische
Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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37
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Boucher MM, Furigay MH, Quach PK, Brindle CS. Liquid–Liquid Extraction Protocol for the Removal of Aldehydes and Highly Reactive Ketones from Mixtures. Org Process Res Dev 2017. [DOI: 10.1021/acs.oprd.7b00231] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maria M. Boucher
- Trinity College, 300 Summit Street, Hartford, Connecticut 06106, United States
| | - Maxwell H. Furigay
- Trinity College, 300 Summit Street, Hartford, Connecticut 06106, United States
| | - Phong K. Quach
- Trinity College, 300 Summit Street, Hartford, Connecticut 06106, United States
| | - Cheyenne S. Brindle
- Trinity College, 300 Summit Street, Hartford, Connecticut 06106, United States
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38
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Chen P, Zhang L, Xue ZL, Wu YD, Zhang X. Density Functional Theory Study of the Reaction between d 0 Tungsten Alkylidyne Complexes and H 2O: Addition versus Hydrolysis. Inorg Chem 2017; 56:7111-7119. [PMID: 28581727 DOI: 10.1021/acs.inorgchem.7b00713] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The reactions of early-transition-metal complexes with H2O have been investigated. An understanding of these elementary steps promotes the design of precursors for the preparation of metal oxide materials or supported heterogeneous catalysts. Density functional theory (DFT) calculations have been conducted to investigate two elementary steps of the reactions between tungsten alkylidyne complexes and H2O, i.e., the addition of H2O to the W≡C bond and ligand hydrolysis. Four tungsten alkylidyne complexes, W(≡CSiMe3)(CH2SiMe3)3 (A-1), W(≡CSiMe3)(CH2tBu)3 (B-1), W(≡CtBu)(CH2tBu)3 (C-1), and W(≡CtBu)(OtBu)3 (D-1), have been compared. The DFT studies provide an energy profile of the two competing pathways. An additional H2O molecule can serve as a proton shuttle, accelerating the H2O addition reaction. The effect of atoms at the α and β positions has also been examined. Because the lone-pair electrons of an O atom at the α position can interact with the orbital of the proton, the barrier of the ligand-hydrolysis reaction for D-1 is dramatically reduced. Both the electronic and steric effects of the silyl group at the β position lower the barriers of both the H2O addition and ligand-hydrolysis reactions. These new mechanistic findings may lead to the further development of metal complex precursors.
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Affiliation(s)
- Ping Chen
- Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen 518055, China
| | - Linxing Zhang
- Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen 518055, China
| | - Zi-Ling Xue
- Department of Chemistry, University of Tennessee , Knoxville, Tennessee 37996, United States
| | - Yun-Dong Wu
- Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen 518055, China.,College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
| | - Xinhao Zhang
- Lab of Computational Chemistry and Drug Design, Laboratory of Chemical Genomics, Peking University Shenzhen Graduate School , Shenzhen 518055, China
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39
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von Kugelgen S, Sifri R, Bellone D, Fischer FR. Regioselective Carbyne Transfer to Ring-Opening Alkyne Metathesis Initiators Gives Access to Telechelic Polymers. J Am Chem Soc 2017; 139:7577-7585. [DOI: 10.1021/jacs.7b02225] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Affiliation(s)
- Stephen von Kugelgen
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Renee Sifri
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Donatela Bellone
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
| | - Felix R. Fischer
- Department
of Chemistry, University of California, Berkeley, California 94720, United States
- Materials
Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
- Kavli Energy Nanosciences Institute at the University of California Berkeley and Lawrence Berkeley National Laboratory, Berkeley, California 94720, United States
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40
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Naktode K, Das S, Nayek HP, Panda TK. Imidazolin-2-iminato ligand supported titanium(IV) aryloxo complexes – Syntheses and structures. Inorganica Chim Acta 2017. [DOI: 10.1016/j.ica.2016.11.010] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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41
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Qureshi ZS, Hamieh A, Barman S, Maity N, Samantaray MK, Ould-Chikh S, Abou-hamad E, Falivene L, D’Elia V, Rothenberger A, Llorens I, Hazemann JL, Basset JM. SOMC-Designed Silica Supported Tungsten Oxo Imidazolin-2-iminato Methyl Precatalyst for Olefin Metathesis Reactions. Inorg Chem 2017; 56:861-871. [DOI: 10.1021/acs.inorgchem.6b02424] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ziyauddin S. Qureshi
- KAUST Catalysis
Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - Ali Hamieh
- KAUST Catalysis
Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - Samir Barman
- KAUST Catalysis
Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - Niladri Maity
- KAUST Catalysis
Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - Manoja K. Samantaray
- KAUST Catalysis
Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - Samy Ould-Chikh
- KAUST Catalysis
Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - Edy Abou-hamad
- KAUST Catalysis
Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - Laura Falivene
- KAUST Catalysis
Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - Valerio D’Elia
- KAUST Catalysis
Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
- Department of Materials Science and Engineering, School of Molecular
Science and Engineering, Vidyasirimedhi Institute of Science and Technology (VISTEC), 21210, Wang Chan, Rayong, Thailand
| | - Alexander Rothenberger
- Physical Science and Engineering Division (PSE), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
| | - Isabelle Llorens
- Institut de Recherches sur la Catalyse et l’Environnement de Lyon IRCELYON, UMR 5256, CNRS—Université Lyon 1, 2 Avenue Albert Einstein, 69626 Villeurbanne Cedex, France
| | - Jean-Louis Hazemann
- Institut Neel, CNRS, 25, avenue des Martyrs, F-38042 Grenoble Cedex 9, France
| | - Jean-Marie Basset
- KAUST Catalysis
Center (KCC), King Abdullah University of Science and Technology (KAUST), 23955-6900 Thuwal, Saudi Arabia
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42
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Àrias Ò, Brandhorst K, Baabe D, Freytag M, Jones PG, Tamm M. Formation of paramagnetic metallacyclobutadienes by reaction of diaminoacetylenes with molybdenum alkylidyne complexes. Dalton Trans 2017; 46:4737-4748. [DOI: 10.1039/c7dt00305f] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The reactions of the molybdenum alkylidyne complex [MesCMo{OCMe(CF3)2}3] with the diaminoacetylenes R2NCCNR2 (NR2 = 4-methylpiperidinyl, NEt2; Mes = 2,4,6-trimethylphenyl) afforded paramagnetic metallacyclobutadiene (MCBD) complexes with diaminodicarbene ligands.
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Affiliation(s)
- Òscar Àrias
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Kai Brandhorst
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Dirk Baabe
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Matthias Freytag
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Braunschweig
- Germany
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43
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Ochiai T, Inoue S. Synthesis of a cyclopentadienyl(imino)stannylene and its direct conversion into halo(imino)stannylenes. RSC Adv 2017. [DOI: 10.1039/c6ra27697k] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
We report the synthesis and structure of a dimeric Cp-substituted iminostannylene as well as its unusual reactivity towards haloalkanes, resulting in the formation of halogen-substituted iminostannylenes.
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Affiliation(s)
- Tatsumi Ochiai
- Institut für Chemie
- Technische Universität Berlin
- 10623 Berlin
- Germany
| | - Shigeyoshi Inoue
- Department of Chemistry
- Catalysis Research Center
- Institute of Silicon Chemistry
- Technische Universität München
- 85748 Garching bei München
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44
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Metz A, Plothe R, Glowacki B, Koszalkowski A, Scheckenbach M, Beringer A, Rösener T, Michaelis de Vasconcellos J, Haase R, Flörke U, Hoffmann A, Herres-Pawlis S. Zinc Chloride Complexes with Aliphatic and Aromatic Guanidine Hybrid Ligands and Their Activity in the Ring-Opening Polymerisation ofd,l-Lactide. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600870] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Angela Metz
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Ramona Plothe
- Technische Universität Dortmund; Fakultät Chemie und Chemische Biologie; Otto-Hahn-Str. 6 44227 Dortmund Germany
| | - Britta Glowacki
- Technische Universität Dortmund; Fakultät Chemie und Chemische Biologie; Otto-Hahn-Str. 6 44227 Dortmund Germany
| | - Andreas Koszalkowski
- Ludwig-Maximilians-Universität München; Department of Chemistry; Butenandtstr. 5-13 81377 München Germany
| | - Michael Scheckenbach
- Ludwig-Maximilians-Universität München; Department of Chemistry; Butenandtstr. 5-13 81377 München Germany
| | - Andreas Beringer
- Ludwig-Maximilians-Universität München; Department of Chemistry; Butenandtstr. 5-13 81377 München Germany
| | - Thomas Rösener
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | | | - Roxana Haase
- Universität Paderborn, Anorganische Chemie; Department Chemie; Warburger Str. 100 33098 Paderborn Germany
| | - Ulrich Flörke
- Universität Paderborn, Anorganische Chemie; Department Chemie; Warburger Str. 100 33098 Paderborn Germany
| | - Alexander Hoffmann
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
| | - Sonja Herres-Pawlis
- Institut für Anorganische Chemie; RWTH Aachen University; Landoltweg 1 52074 Aachen Germany
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45
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Du Y, Yang H, Zhu C, Ortiz M, Okochi KD, Shoemaker R, Jin Y, Zhang W. Highly Active Multidentate Ligand‐Based Alkyne Metathesis Catalysts. Chemistry 2016; 22:7959-63. [DOI: 10.1002/chem.201505174] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2015] [Indexed: 01/03/2023]
Affiliation(s)
- Ya Du
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
| | - Haishen Yang
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
| | - Chengpu Zhu
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
| | - Michael Ortiz
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
| | - Kenji D. Okochi
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
| | - Richard Shoemaker
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
| | - Yinghua Jin
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
| | - Wei Zhang
- Department of Chemistry and Biochemistry University of Colorado Boulder CO 80309 USA
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46
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Naktode K, Das S, Bhattacharjee J, Nayek HP, Panda TK. Imidazolin-2-iminato Ligand-Supported Titanium Complexes as Catalysts for the Synthesis of Urea Derivatives. Inorg Chem 2016; 55:1142-53. [PMID: 26789927 DOI: 10.1021/acs.inorgchem.5b02302] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The reactions of tetrakis(dimethylamido)titanium(IV) [Ti(NMe2)4] with three different imidazolin-2-imines (Im(R)NH; R = tert-butyl (tBu), mesityl (Mes), and 2,6-diisopropylphenyl (Dipp)) afforded the corresponding titanium imidazolin-2-iminato complexes [(Im(R)N)Ti(NMe2)3] (R = tBu, 1a; R = Mes, 1b; R = Dipp, 1c). Treatment of complex 1a with two different carbodiimides [R'N═C═NR'; R' = cyclohexyl (Cy) and isopropyl (iPr)] resulted in the formation of imidazolin-2-iminato titanium mono(guanidinate) complex of the type [(Im(R)N)Ti(R'NC(NMe2)NR') (NMe2)2 (R' = iPr; R = tBu (2a), R = Dipp (2c); R' = Cy, R = tBu (3a)], as yellow solid in 94% yield. However, a similar reaction of 1b and 1c with 2 equiv of phenyl isocyanates at ambient temperature resulted in the formation of corresponding titanium bis(ureate) complexes [(Im(R)N)Ti{κ(2)-OC(NMe2)NPh}2(NMe2)] (R = Mes, 4b and R = Dipp, 4c). Three equivalents of phenyl isothiocyanate reacted with complex 1c to afford respective titanium tris(thioureate) complex [(Im(Dipp)N)Ti{κ(2)-SC(NMe2)NPh}2{κ(1)-SC(NMe2)NPh}] (6c). The molecular structures of 1a-c, 2a, 2c, 3a, 4c, and 6c were established by X-ray diffraction analyses, and, from the solid-state structures of 1a-c, 2a, 2c, 3a, 4c, and 6c, it was confirmed that the imidazolin-2-iminato titanium bond in each case is very short and possesses a multiple-bonding character. The imidazolin-2-iminato titanium complex 1c was utilized as a precatalyst for the addition of amine N-H bond to phenyl isocyanate. High yields of the corresponding urea derivatives were achieved under mild conditions. The mechanistic study of the aforementioned catalytic reaction was performed, and the active catalyst complex 7b was isolated using 2 equiv of iminopyrrole [2-(2,6-iPr2C6H3N═CH)C4H3NH] and the complex 4b. The molecular structure of 7b was thereafter established.
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Affiliation(s)
- Kishor Naktode
- Department of Chemistry, Indian Institute of Technology Hyderabad , Kandi Sangareddy, 502 285 Telangana, India
| | - Suman Das
- Department of Chemistry, Indian Institute of Technology Hyderabad , Kandi Sangareddy, 502 285 Telangana, India
| | - Jayeeta Bhattacharjee
- Department of Chemistry, Indian Institute of Technology Hyderabad , Kandi Sangareddy, 502 285 Telangana, India
| | - Hari Pada Nayek
- Department of Applied Chemistry, Indian School of Mines , Dhanbad, 826004 Jharkhand, India
| | - Tarun K Panda
- Department of Chemistry, Indian Institute of Technology Hyderabad , Kandi Sangareddy, 502 285 Telangana, India
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47
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Sen S, Frey W, Meisner J, Kästner J, Buchmeiser MR. An anionic molybdenum amidato bisalkyl alkylidyne complex. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.09.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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48
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Hötling S, Bittner C, Tamm M, Dähn S, Collatz J, Steidle JLM, Schulz S. Identification of a Grain Beetle Macrolide Pheromone and Its Synthesis by Ring-Closing Metathesis Using a Terminal Alkyne. Org Lett 2015; 17:5004-7. [DOI: 10.1021/acs.orglett.5b02461] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Susann Hötling
- Institut
für Organische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Celine Bittner
- Institut
für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Matthias Tamm
- Institut
für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Sonja Dähn
- Fachgebiet
Tierökologie, Institut für Zoologie, Universität Hohenheim, 70593 Stuttgart, Germany
| | - Jana Collatz
- Fachgebiet
Tierökologie, Institut für Zoologie, Universität Hohenheim, 70593 Stuttgart, Germany
| | - Johannes L. M. Steidle
- Fachgebiet
Tierökologie, Institut für Zoologie, Universität Hohenheim, 70593 Stuttgart, Germany
| | - Stefan Schulz
- Institut
für Organische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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49
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Abstract
A wide variety of organisms communicate via the chemical channel using small molecules. A structural feature quite often found is the lactone motif. In the present paper, the current knowledge on such lactones will be described, concentrating on the structure, chemistry, function, biosynthesis and synthesis of these compounds. Lactone semiochemicals from insects, vertebrates and bacteria, which this article will focus on, are particularly well investigated. In addition, some ideas on the advantageous use of lactones as volatile signals, which promoted their evolutionary development, will be discussed.
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Affiliation(s)
- Stefan Schulz
- Institute of Organic Chemistry, Technische Universität Braunschweig, 38106 Braunschweig, Germany.
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50
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Karmel ISR, Fridman N, Tamm M, Eisen MS. Mixed Imidazolin-2-iminato–Cp* Thorium(IV) Complexes: Synthesis and Reactivity Toward Oxygen-Containing Substrates. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00273] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Isabell S. R. Karmel
- Schulich
Faculty of Chemistry, Institute of Catalysis Science and Technology, Technion − Israel Institute of Technology, Technion City, Haifa, 32000 Israel
| | - Natalia Fridman
- Schulich
Faculty of Chemistry, Institute of Catalysis Science and Technology, Technion − Israel Institute of Technology, Technion City, Haifa, 32000 Israel
| | - Matthias Tamm
- Institut
für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Moris S. Eisen
- Schulich
Faculty of Chemistry, Institute of Catalysis Science and Technology, Technion − Israel Institute of Technology, Technion City, Haifa, 32000 Israel
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