1
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Logallo A, Maddock LCH, Mu M, Gravogl L, Jin N, Peñas-Defrutos MN, Meyer K, García-Melchor M, Hevia E. Unlocking the Metalation Applications of TMP-powered Fe and Co(II) bis(amides): Synthesis, Structure and Mechanistic Insights. Angew Chem Int Ed Engl 2024; 63:e202402907. [PMID: 38563772 DOI: 10.1002/anie.202402907] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2024] [Revised: 03/19/2024] [Accepted: 04/02/2024] [Indexed: 04/04/2024]
Abstract
Typified by LiTMP and TMPMgCl.LiCl, (TMP=2,2,6,6-tetramethylpiperidide), s-block metal amides have found widespread applications in arene deprotonative metalation. On the contrary, transition metal amides lack sufficient basicity to activate these substrates. Breaking new ground in this field, here we present the synthesis and full characterisation of earth-abundant transition metals M(TMP)2 (M=Fe, Co). Uncovering a new reactivity profile towards fluoroarenes, these amide complexes can promote direct M-H exchange processes regioselectively using one or two of their basic amide arms. Remarkably, even when using a perfluorinated substrate, selective C-H metalation occurs leaving C-F bonds intact. Their kinetic basicity can be boosted by LiCl or NBu4Cl additives which enables formation of kinetically activated ate species. Combining spectroscopic and structural studies with DFT calculations, mechanistic insights have been gained on how these low polarity metalation processes take place. M(TMP)2 can also be used to access ferrocene and cobaltocene by direct deprotonation of cyclopentadiene and undergo efficient CO2 insertion of both amide groups under mild reaction conditions.
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Affiliation(s)
- Alessandra Logallo
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Lewis C H Maddock
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Manting Mu
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin College Green, Dublin, Ireland
| | - Lisa Gravogl
- Department of Chemistry and Pharmacy, Inorganic Chemistry Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Erlangen, Germany
| | - Na Jin
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, 3012, Bern, Switzerland
| | - Marconi N Peñas-Defrutos
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin College Green, Dublin, Ireland
- IU CINQUIMA, Química Inorgánica, Facultad de Ciencias, Universidad de Valladolid, 47071, Valladolid, Spain
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058, Erlangen, Germany
| | - Max García-Melchor
- School of Chemistry, CRANN and AMBER Research Centres, Trinity College Dublin College Green, Dublin, Ireland
| | - Eva Hevia
- Department für Chemie und Biochemie, Universität Bern, Freiestrasse 3, 3012, Bern, Switzerland
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2
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Chakraborty U, Fedulin A, Jacobi von Wangelin A. Synthesis and Catalysis of Anionic Amido Iron(II) Complexes. ChemCatChem 2022; 14:e202201105. [PMID: 37064762 PMCID: PMC10099668 DOI: 10.1002/cctc.202201105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2022] [Revised: 10/21/2022] [Indexed: 11/11/2022]
Abstract
Low-coordinate, open-shell 3d metal complexes have attracted great attention due to their critical role in several catalytic transformations but have been notoriously difficult to prepare and study due to their high lability. Here, we report the synthesis of a heteroleptic tri-coordinate amidoferrate that displays high catalytic activity in the regioselective hydrosilylation of alkenes.
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Affiliation(s)
- Uttam Chakraborty
- Department of ChemistryUniversity of HamburgMartin Luther King Pl 620146HamburgGermany
| | - Andrey Fedulin
- Department of ChemistryUniversity of HamburgMartin Luther King Pl 620146HamburgGermany
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3
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Han B, Zhang M, Jiao H, Chen R, Ma H, Li R, Wang J, Zhang Y. Regioselective Hydrogenation of Polycyclic Aromatic Hydrocarbons and Olefins Catalyzed by Magnesium‐Activated Chromium Complexes. ChemistrySelect 2022. [DOI: 10.1002/slct.202200776] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Bo Han
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Miaomiao Zhang
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Hongmei Jiao
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Rong Chen
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Haojie Ma
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Ran Li
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Jijiang Wang
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
| | - Yuqi Zhang
- Laboratory of New Energy & New Function Materials and Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical Engineering Yan'an University Shengdi Road 580# Yan'an Shaanxi 716000 P. R. China
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4
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Ghosh P, Schoch R, Bauer M, Jacobi von Wangelin A. Selective Benzylic CH‐Borylations by Tandem Cobalt Catalysis. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202110821] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Pradip Ghosh
- Dept. of Chemistry University of Hamburg Martin Luther King Pl 6 20146 Hamburg Germany
| | - Roland Schoch
- Dept. of Chemistry Center for Sustainable Systems Design, CSSD University of Paderborn 33098 Paderborn Germany
| | - Matthias Bauer
- Dept. of Chemistry Center for Sustainable Systems Design, CSSD University of Paderborn 33098 Paderborn Germany
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5
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Ghosh P, Schoch R, Bauer M, Jacobi von Wangelin A. Selective Benzylic CH-Borylations by Tandem Cobalt Catalysis. Angew Chem Int Ed Engl 2022; 61:e202110821. [PMID: 34596960 PMCID: PMC9299014 DOI: 10.1002/anie.202110821] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2021] [Indexed: 01/09/2023]
Abstract
Metal-catalyzed C-H activations are environmentally and economically attractive synthetic strategies for the construction of functional molecules as they obviate the need for pre-functionalized substrates and minimize waste generation. Great challenges reside in the control of selectivities, the utilization of unbiased hydrocarbons, and the operation of atom-economical dehydrocoupling mechanisms. An especially mild borylation of benzylic CH bonds was developed with the ligand-free pre-catalyst Co[N(SiMe3 )2 ]2 and the bench-stable and inexpensive borylation reagent B2 pin2 that produces H2 as the only by-product. A full set of kinetic, spectroscopic, and preparative mechanistic studies are indicative of a tandem catalysis mechanism of CH-borylation and dehydrocoupling via molecular CoI catalysts.
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Affiliation(s)
- Pradip Ghosh
- Dept. of ChemistryUniversity of HamburgMartin Luther King Pl 620146HamburgGermany
| | - Roland Schoch
- Dept. of ChemistryCenter for Sustainable Systems Design, CSSDUniversity of Paderborn33098PaderbornGermany
| | - Matthias Bauer
- Dept. of ChemistryCenter for Sustainable Systems Design, CSSDUniversity of Paderborn33098PaderbornGermany
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6
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Maddock L, Morton R, Kennedy A, Hevia E. Lateral Metallation and Redistribution Reactions of Sodium Ferrates Containing Bulky 2,6-Diisopropyl-N-(trimethylsilyl)anilide Ligands. Chemistry 2021; 27:15180-15186. [PMID: 34324749 PMCID: PMC8596604 DOI: 10.1002/chem.202102328] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2021] [Indexed: 12/02/2022]
Abstract
Alkali‐metal ferrates containing amide groups have emerged as regioselective bases capable of promoting Fe−H exchanges of aromatic substrates. Advancing this area of heterobimetallic chemistry, a new series of sodium ferrates is introduced incorporating the bulky arylsilyl amido ligand N(SiMe3)(Dipp) (Dipp=2,6‐iPr2‐C6H3). Influenced by the large steric demands imposed by this amide, transamination of [NaFe(HMDS)3] (HMDS=N(SiMe3)2) with an excess of HN(SiMe3)(Dipp) led to the isolation of heteroleptic [Na(HMDS)2Fe{N(SiMe3)Dipp}]∞ (1) resulting from the exchange of just one HMDS group. An alternative co‐complexation approach, combining the homometallic metal amides [NaN(SiMe3)Dipp] and [Fe{N(SiMe3)Dipp}2] induces lateral metallation of one Me arm from the SiMe3 group in the iron amide furnishing tetrameric [NaFe{N(SiCH2Me2)Dipp}{N(SiMe3)Dipp}]4 (2). Reactivity studies support that this deprotonation is driven by the steric incompatibility of the single metal amides rather than the basic capability of the sodium reagent. Displaying synergistic reactivity, heteroleptic sodium ferrate 1 can selectively promote ferration of pentafluorobenzene using one of its HMDS arms to give heterotrileptic [Na{N(SiMe3)Dipp}(HMDS)Fe(C6F5)]∞ (4). Attempts to deprotonate less activated pyridine led to the isolation of NaHMDS and heteroleptic Fe(II) amide [(py)Fe{N(SiMe3)Dipp}(HMDS)] (5), resulting from an alternative redistribution process which is favoured by the Lewis donor ability of this substrate.
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Affiliation(s)
- Lewis Maddock
- University of Bern: Universitat Bern, Department of Chemistry and Biochemistry, SWITZERLAND
| | - Rebekka Morton
- University of Strathclyde Department of Pure and Applied Chemistry, Pure and Applied Chemistry, UNITED KINGDOM
| | - Alan Kennedy
- University of Strathclyde Faculty of Science, Pure and applied chemistry, UNITED KINGDOM
| | - Eva Hevia
- Universitat Bern, Department of Chemistry and Biochemistry, Freiestrasse 3, 3012, Bern, SWITZERLAND
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7
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Taniguchi W, Ito JI, Yamashita M. CNC-pincer iron complexes containing a bis(N-heterocyclic carbene)Amido ligand: Synthesis and application to catalytic hydrogenation of alkenes. J Organomet Chem 2020. [DOI: 10.1016/j.jorganchem.2020.121436] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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8
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Wang Y, Cao X, Zhao L, Pi C, Ji J, Cui X, Wu Y. Generalized Chemoselective Transfer Hydrogenation/Hydrodeuteration. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000759] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yong Wang
- Henan Key Laboratory of Chemical Biology and Organic Chemistry Key Laboratory of Applied Chemistry of Henan Universities Green Catalysis Center and College of Chemistry Zhengzhou University Zhengzhou 450052 People's Republic of China
| | - Xinyi Cao
- International College Zhengzhou University Zhengzhou 450052 People's Republic of China
| | - Leyao Zhao
- International College Zhengzhou University Zhengzhou 450052 People's Republic of China
| | - Chao Pi
- Henan Key Laboratory of Chemical Biology and Organic Chemistry Key Laboratory of Applied Chemistry of Henan Universities Green Catalysis Center and College of Chemistry Zhengzhou University Zhengzhou 450052 People's Republic of China
| | - Jingfei Ji
- International College Zhengzhou University Zhengzhou 450052 People's Republic of China
| | - Xiuling Cui
- Henan Key Laboratory of Chemical Biology and Organic Chemistry Key Laboratory of Applied Chemistry of Henan Universities Green Catalysis Center and College of Chemistry Zhengzhou University Zhengzhou 450052 People's Republic of China
| | - Yangjie Wu
- Henan Key Laboratory of Chemical Biology and Organic Chemistry Key Laboratory of Applied Chemistry of Henan Universities Green Catalysis Center and College of Chemistry Zhengzhou University Zhengzhou 450052 People's Republic of China
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9
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Ishihara K, Araki Y, Tada M, Takayama T, Sakai Y, Sameera WMC, Ohki Y. Synthesis of Dinuclear Mo-Fe Hydride Complexes and Catalytic Silylation of N 2. Chemistry 2020; 26:9537-9546. [PMID: 32180271 DOI: 10.1002/chem.202000104] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 02/24/2020] [Indexed: 11/08/2022]
Abstract
Two transition-metal atoms bridged by hydrides may represent a useful structural motif for N2 activation by molecular complexes and the enzyme active site. In this study, dinuclear MoIV -FeII complexes with bridging hydrides, CpR Mo(PMe3 )(H)(μ-H)3 FeCp* (2 a; CpR =Cp*=C5 Me5 , 2 b; CpR =C5 Me4 H), were synthesized via deprotonation of CpR Mo(PMe3 )H5 (1 a; CpR =Cp*, 1 b; CpR =C5 Me4 H) by Cp*FeN(SiMe3 )2 , and they were characterized by spectroscopy and crystallography. These Mo-Fe complexes reveal the shortest Mo-Fe distances ever reported (2.4005(3) Å for 2 a and 2.3952(3) Å for 2 b), and the Mo-Fe interactions were analyzed by computational studies. Removal of the terminal Mo-H hydride in 2 a-2 b by [Ph3 C]+ in THF led to the formation of cationic THF adducts [CpR Mo(PMe3 )(THF)(μ-H)3 FeCp*]+ (3 a; CpR =Cp*, 3 b; CpR =C5 Me4 H). Further reaction of 3 a with LiPPh2 gave rise to a phosphido-bridged complex Cp*Mo(PMe3 )(μ-H)(μ-PPh2 )FeCp* (4). A series of Mo-Fe complexes were subjected to catalytic silylation of N2 in the presence of Na and Me3 SiCl, furnishing up to 129±20 equiv of N(SiMe3 )3 per molecule of 2 b. Mechanism of the catalytic cycle was analyzed by DFT calculations.
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Affiliation(s)
- Kodai Ishihara
- Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan
| | - Yuna Araki
- Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan
| | - Mizuki Tada
- Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan.,Integrated Research Consortium on Chemical Sciences (IRCCS), Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan
| | - Tsutomu Takayama
- Department of Chemistry, Daido University, Takiharu-cho, Minami-ku, Nagoya, 457-8530, Japan
| | - Yoichi Sakai
- Department of Chemistry, Daido University, Takiharu-cho, Minami-ku, Nagoya, 457-8530, Japan
| | - W M C Sameera
- Institute of Low Temperature Science, Hokkaido University, Sapporo, 060-0819, Japan
| | - Yasuhiro Ohki
- Department of Chemistry, Graduate School of Science, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602, Japan
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10
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Gregori BJ, Schwarzhuber F, Pöllath S, Zweck J, Fritsch L, Schoch R, Bauer M, Jacobi von Wangelin A. Stereoselective Alkyne Hydrogenation by using a Simple Iron Catalyst. CHEMSUSCHEM 2019; 12:3864-3870. [PMID: 31265757 DOI: 10.1002/cssc.201900926] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2019] [Revised: 06/04/2019] [Indexed: 06/09/2023]
Abstract
The stereoselective hydrogenation of alkynes constitutes one of the key approaches for the construction of stereodefined alkenes. The majority of conventional methods utilize noble and toxic metal catalysts. This study concerns a simple catalyst comprised of the commercial chemicals iron(II) acetylacetonate and diisobutylaluminum hydride, which enables the Z-selective semihydrogenation of alkynes under near ambient conditions (1-3 bar H2 , 30 °C, 5 mol % [Fe]). Neither an elaborate catalyst preparation nor addition of ligands is required. Mechanistic studies (kinetic poisoning, X-ray absorption spectroscopy, TEM) strongly indicate the operation of small iron clusters and particle catalysts.
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Affiliation(s)
- Bernhard J Gregori
- Dept. of Chemistry, University of Hamburg, Martin Luther King Pl 6, 20146, Hamburg, Germany
| | - Felix Schwarzhuber
- Dept. of Physics, University of Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany
| | - Simon Pöllath
- Dept. of Physics, University of Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany
| | - Josef Zweck
- Dept. of Physics, University of Regensburg, Universitätsstraße 31, 93053, Regensburg, Germany
| | - Lorena Fritsch
- Institute of Inorganic Chemistry and Center for Sustainable Systems Design (CSSD), University of Paderborn, Warburger Straße 100, 33098, Paderborn, Germany
| | - Roland Schoch
- Institute of Inorganic Chemistry and Center for Sustainable Systems Design (CSSD), University of Paderborn, Warburger Straße 100, 33098, Paderborn, Germany
| | - Matthias Bauer
- Institute of Inorganic Chemistry and Center for Sustainable Systems Design (CSSD), University of Paderborn, Warburger Straße 100, 33098, Paderborn, Germany
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11
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Chakraborty U, Demeshko S, Meyer F, Jacobi von Wangelin A. Synthesis and Reactivity of an Early-Transition-Metal Alkynyl Cubane Mn 4
C 4
Cluster. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201812529] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Uttam Chakraborty
- Department of Chemistry; University of Hamburg; Martin-Luther-King-Platz 6 20146 Hamburg Germany
| | - Serhiy Demeshko
- Institute of Inorganic Chemistry; University of Göttingen; Tammannstrasse 2 37077 Göttingen Germany
| | - Franc Meyer
- Institute of Inorganic Chemistry; University of Göttingen; Tammannstrasse 2 37077 Göttingen Germany
| | - Axel Jacobi von Wangelin
- Department of Chemistry; University of Hamburg; Martin-Luther-King-Platz 6 20146 Hamburg Germany
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12
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Chakraborty U, Demeshko S, Meyer F, Jacobi von Wangelin A. Synthesis and Reactivity of an Early-Transition-Metal Alkynyl Cubane Mn 4 C 4 Cluster. Angew Chem Int Ed Engl 2019; 58:3466-3470. [PMID: 30632661 DOI: 10.1002/anie.201812529] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Indexed: 12/20/2022]
Abstract
While the coordination chemistry of monometallic complexes and the surface properties of extended metal particles are well understood, the control of metal nanocluster formation has remained challenging. The isolation of discrete metal clusters provides an especially rare snapshot at the nanoscale of cluster growth. The synthesis and full characterization of the first early-transition-metal alkynyl cubane and the first μ3 -alkynyl Mn3 motif are reported.
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Affiliation(s)
- Uttam Chakraborty
- Department of Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146, Hamburg, Germany
| | - Serhiy Demeshko
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstrasse 2, 37077, Göttingen, Germany
| | - Franc Meyer
- Institute of Inorganic Chemistry, University of Göttingen, Tammannstrasse 2, 37077, Göttingen, Germany
| | - Axel Jacobi von Wangelin
- Department of Chemistry, University of Hamburg, Martin-Luther-King-Platz 6, 20146, Hamburg, Germany
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13
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Sears JD, Muñoz SB, Daifuku SL, Shaps AA, Carpenter SH, Brennessel WW, Neidig ML. The Effect of β-Hydrogen Atoms on Iron Speciation in Cross-Couplings with Simple Iron Salts and Alkyl Grignard Reagents. Angew Chem Int Ed Engl 2019; 58:2769-2773. [PMID: 30653812 PMCID: PMC6472485 DOI: 10.1002/anie.201813578] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2018] [Revised: 01/07/2019] [Indexed: 11/08/2022]
Abstract
The effects of β-hydrogen-containing alkyl Grignard reagents in simple ferric salt cross-couplings have been elucidated. The reaction of FeCl3 with EtMgBr in THF leads to the formation of the cluster species [Fe8 Et12 ]2- , a rare example of a structurally characterized metal complex with bridging ethyl ligands. Analogous reactions in the presence of NMP, a key additive for effective cross-coupling with simple ferric salts and β-hydrogen-containing alkyl nucleophiles, result in the formation of [FeEt3 ]- . Reactivity studies demonstrate the effectiveness of [FeEt3 ]- in rapidly and selectively forming the cross-coupled product upon reaction with electrophiles. The identification of iron-ate species with EtMgBr analogous to those previously observed with MeMgBr is a critical insight, indicating that analogous iron species can be operative in catalysis for these two classes of alkyl nucleophiles.
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Affiliation(s)
- Jeffrey D Sears
- Department of Chemistry, University of Rochester, B31 Hutchison Hall, 120 Trustee Road, Rochester, NY, 14627, USA
| | - Salvador B Muñoz
- Department of Chemistry, University of Rochester, B31 Hutchison Hall, 120 Trustee Road, Rochester, NY, 14627, USA
| | - Stephanie L Daifuku
- Department of Chemistry, University of Rochester, B31 Hutchison Hall, 120 Trustee Road, Rochester, NY, 14627, USA
| | - Ari A Shaps
- Department of Chemistry, University of Rochester, B31 Hutchison Hall, 120 Trustee Road, Rochester, NY, 14627, USA
| | - Stephanie H Carpenter
- Department of Chemistry, University of Rochester, B31 Hutchison Hall, 120 Trustee Road, Rochester, NY, 14627, USA
| | - William W Brennessel
- Department of Chemistry, University of Rochester, B31 Hutchison Hall, 120 Trustee Road, Rochester, NY, 14627, USA
| | - Michael L Neidig
- Department of Chemistry, University of Rochester, B31 Hutchison Hall, 120 Trustee Road, Rochester, NY, 14627, USA
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14
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Sears JD, Muñoz SB, Daifuku SL, Shaps AA, Carpenter SH, Brennessel WW, Neidig ML. The Effect of β‐Hydrogen Atoms on Iron Speciation in Cross‐Couplings with Simple Iron Salts and Alkyl Grignard Reagents. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201813578] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Jeffrey D. Sears
- Department of Chemistry University of Rochester B31 Hutchison Hall 120 Trustee Road Rochester NY 14627 USA
| | - Salvador B. Muñoz
- Department of Chemistry University of Rochester B31 Hutchison Hall 120 Trustee Road Rochester NY 14627 USA
| | - Stephanie L. Daifuku
- Department of Chemistry University of Rochester B31 Hutchison Hall 120 Trustee Road Rochester NY 14627 USA
| | - Ari A. Shaps
- Department of Chemistry University of Rochester B31 Hutchison Hall 120 Trustee Road Rochester NY 14627 USA
| | - Stephanie H. Carpenter
- Department of Chemistry University of Rochester B31 Hutchison Hall 120 Trustee Road Rochester NY 14627 USA
| | - William W. Brennessel
- Department of Chemistry University of Rochester B31 Hutchison Hall 120 Trustee Road Rochester NY 14627 USA
| | - Michael L. Neidig
- Department of Chemistry University of Rochester B31 Hutchison Hall 120 Trustee Road Rochester NY 14627 USA
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15
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Ünver H. Effective Room Temperature Hydrogenation of Alkenes by X‐Ray Characterized Salicylaldimine‐Rhodium(I) Complex. ChemistrySelect 2018. [DOI: 10.1002/slct.201802866] [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)
- Hakan Ünver
- Department of Chemistry, Faculty of ScienceEskişehir Technical University Eskişehir 26470 Turkey
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16
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Murphy LJ, Ferguson MJ, McDonald R, Lumsden MD, Turculet L. Synthesis of Bis(phosphino)silyl Pincer-Supported Iron Hydrides for the Catalytic Hydrogenation of Alkenes. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00807] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Luke J. Murphy
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, P.O. Box 15000, Halifax, Nova Scotia, Canada B3H 4R2
| | - Michael J. Ferguson
- X-Ray Crystallography Laboratory, Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
| | - Robert McDonald
- X-Ray Crystallography Laboratory, Department of Chemistry, University of Alberta, Edmonton, Alberta, Canada T6G 2G2
| | - Michael D. Lumsden
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, P.O. Box 15000, Halifax, Nova Scotia, Canada B3H 4R2
| | - Laura Turculet
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, P.O. Box 15000, Halifax, Nova Scotia, Canada B3H 4R2
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17
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Khan I, Reed‐Berendt BG, Melen RL, Morrill LC. FLP-Catalyzed Transfer Hydrogenation of Silyl Enol Ethers. Angew Chem Int Ed Engl 2018; 57:12356-12359. [PMID: 30106498 PMCID: PMC6207922 DOI: 10.1002/anie.201808800] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Indexed: 01/08/2023]
Abstract
Herein we report the first catalytic transfer hydrogenation of silyl enol ethers. This metal free approach employs tris(pentafluorophenyl)borane and 2,2,6,6-tetramethylpiperidine (TMP) as a commercially available FLP catalyst system and naturally occurring γ-terpinene as a dihydrogen surrogate. A variety of silyl enol ethers undergo efficient hydrogenation, with the reduced products isolated in excellent yields (29 examples, 82 % average yield).
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Affiliation(s)
- Imtiaz Khan
- School of ChemistryCardiff UniversityMain BuildingPark PlaceCardiffCF10 3ATUK
| | | | - Rebecca L. Melen
- School of ChemistryCardiff UniversityMain BuildingPark PlaceCardiffCF10 3ATUK
| | - Louis C. Morrill
- School of ChemistryCardiff UniversityMain BuildingPark PlaceCardiffCF10 3ATUK
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Chakraborty U, Reyes‐Rodriguez E, Demeshko S, Meyer F, Jacobi von Wangelin A. A Manganese Nanosheet: New Cluster Topology and Catalysis. Angew Chem Int Ed Engl 2018; 57:4970-4975. [PMID: 29436771 PMCID: PMC5969092 DOI: 10.1002/anie.201800079] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2018] [Revised: 02/05/2018] [Indexed: 01/12/2023]
Abstract
While the coordination chemistry of monometallic complexes and the surface characteristics of larger metal particles are well understood, preparations of molecular metallic nanoclusters remain a great challenge. Discrete planar metal clusters constitute nanoscale snapshots of cluster growth but are especially rare owing to the strong preference for three-dimensional structures and rapid aggregation or decomposition. A simple ligand-exchange procedure has led to the formation of a novel heteroleptic Mn6 nanocluster that crystallized in an unprecedented flat-chair topology and exhibited unique magnetic and catalytic properties. Magnetic susceptibility studies documented strong electronic communication between the manganese ions. Reductive activation of the molecular Mn6 cluster enabled catalytic hydrogenations of alkenes, alkynes, and imines.
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Affiliation(s)
- Uttam Chakraborty
- Department of ChemistryUniversity ofRegensburgGermany
- Department of ChemistryUniversity of HamburgMartin Luther King Pl. 620146HamburgGermany
| | | | - Serhiy Demeshko
- University of GöttingenInstitute of Inorganic ChemistryTammannstraße 437077GöttingenGermany
| | - Franc Meyer
- University of GöttingenInstitute of Inorganic ChemistryTammannstraße 437077GöttingenGermany
| | - Axel Jacobi von Wangelin
- Department of ChemistryUniversity ofRegensburgGermany
- Department of ChemistryUniversity of HamburgMartin Luther King Pl. 620146HamburgGermany
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Chakraborty U, Reyes-Rodriguez E, Demeshko S, Meyer F, Jacobi von Wangelin A. A Manganese Nanosheet: New Cluster Topology and Catalysis. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201800079] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Uttam Chakraborty
- Department of Chemistry; University of; Regensburg Germany
- Department of Chemistry; University of Hamburg; Martin Luther King Pl. 6 20146 Hamburg Germany
| | | | - Serhiy Demeshko
- University of Göttingen; Institute of Inorganic Chemistry; Tammannstraße 4 37077 Göttingen Germany
| | - Franc Meyer
- University of Göttingen; Institute of Inorganic Chemistry; Tammannstraße 4 37077 Göttingen Germany
| | - Axel Jacobi von Wangelin
- Department of Chemistry; University of; Regensburg Germany
- Department of Chemistry; University of Hamburg; Martin Luther King Pl. 6 20146 Hamburg Germany
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Axel Jacobi von Wangelin. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/anie.201708512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Axel Jacobi von Wangelin. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708512] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Villa M, Miesel D, Hildebrandt A, Ragaini F, Schaarschmidt D, Jacobi von Wangelin A. Synthesis and Catalysis of Redox-Active Bis(imino)acenaphthene (BIAN) Iron Complexes. ChemCatChem 2017. [DOI: 10.1002/cctc.201700144] [Citation(s) in RCA: 46] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Matteo Villa
- Institute of Organic Chemistry; University of Regensburg; Universitaetsstr. 31 93040 Regensburg Germany
| | - Dominique Miesel
- Institute of Chemistry-Inorganic Chemistry; TU Chemnitz; 09107 Chemnitz Germany
| | | | - Fabio Ragaini
- Department of Chemistry; University of Milan; Via C. Golgi 17 20133 Milan Italy
| | - Dieter Schaarschmidt
- Institute of Organic Chemistry; University of Regensburg; Universitaetsstr. 31 93040 Regensburg Germany
- Current address: Department of Chemistry; University of Hamburg; Martin-Luther-King-Platz 6 20146 Hamburg Germany
| | - Axel Jacobi von Wangelin
- Institute of Organic Chemistry; University of Regensburg; Universitaetsstr. 31 93040 Regensburg Germany
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