1
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Chowdhury T, Wilson C, Farnaby JH. Activation and functionalisation of carbon dioxide by bis-tris(pyrazolyl)borate-supported divalent samarium and trivalent lanthanide silylamide complexes. Dalton Trans 2024. [PMID: 38953525 DOI: 10.1039/d4dt01382d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/04/2024]
Abstract
Synthesis and reactivity with carbon dioxide (CO2) of divalent samarium in the bis-tris(pyrazolyl)borate ligand environment has been reported. In addition, CO2 activation and functionalisation by lanthanide silylamides in the bis-tris(pyrazolyl)borate ligand environment was demonstrated. Reduction of the Sm(III) precursor [Sm(Tp)2(OTf)] (Tp = hydrotris(1-pyrazolyl)borate; OTf = triflate) with KC8 yielded the insoluble Sm(II) multi-metallic coordination polymer [{Sm(Tp)2}n] 1-Sm. Addition of 1,2-dimethoxyethane (DME) to 1-Sm enabled isolation of the monomeric complex [Sm(Tp)2(DME)] 1-Sm(DME). Complex 1-Sm(DME) reduced CO2 to yield the oxalate-bridged dimeric Sm(III) complex [{Sm(Tp)2}2(μ-η2:η2-O2CCO2)] 2-Sm. The reactions of heteroleptic Ln(III) silylamide complexes [Ln(Tp)2(N'')] (Ln = Y, Sm; N'' = N(SiMe3)2) with CO2 yielded monomeric Ln(III) silyloxides [Ln(Tp)2(OSiMe3)] 3-Ln and trimethylsilyl isocyanate (OCNSiMe3). Complexes 3-Ln are the first crystallographically characterised examples of Ln(III)-OSiMe3 bonds accessed via CO2 activation and functionalisation. Full characterisation data are presented for all complexes, including solid-state molecular structure determination by single-crystal X-ray diffraction.
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Affiliation(s)
- Tajrian Chowdhury
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Claire Wilson
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Joy H Farnaby
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK.
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2
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Bokouende SS, Kulasekara DN, Worku SA, Ward CL, Kajjam AB, Lutter JC, Allen MJ. Expanding the Coordination of f-Block Metals with Tris[2-(2-methoxyethoxy)ethyl]amine: From Molecular Complexes to Cage-like Structures. Inorg Chem 2024; 63:9434-9450. [PMID: 38016147 PMCID: PMC11129929 DOI: 10.1021/acs.inorgchem.3c02752] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2023]
Abstract
Low-valent f-block metals have intrinsic luminescence, electrochemical, and magnetic properties that are modulated with ligands, causing the coordination chemistry of these metals to be imperative to generating critical insights needed to impact modern applications. To this end, we synthesized and characterized a series of twenty-seven complexes of f-metal ions including EuII, YbII, SmII, and UIII and hexanuclear clusters of LaIII and CeIII to study the impact of tris[2-(2-methoxyethoxy)ethyl]amine, a flexible acyclic analogue of the extensively studied 2.2.2-cryptand, on the coordination chemistry and photophysical properties of low-valent f-block metals. We demonstrate that the flexibility of the ligand enables luminescence tunability over a greater range than analogous cryptates of EuII in solution. Furthermore, the ligand also displays a variety of binding modes to f-block metals in the solid state that are inaccessible to cryptates of low-valent f-block metals. In addition to serving as a ligand for f-block metals of various sizes and oxidation states, tris[2-(2-methoxyethoxy)ethyl]amine also deprotonates water molecules coordinated to trivalent triflate salts of f-block metal ions, enabling the isolation of hexanuclear clusters containing either LaIII or CeIII. The ligand was also found to bind more tightly to YbII and UIII in the solid state compared to 2.2.2-cryptand, suggesting that it can play a role in the isolation of other low-valent f-block metals such CfII, NpIII, and PuIII. We expect that our findings will inspire applications of tris[2-(2-methoxyethoxy)ethyl]amine in the design of light-emitting diodes and the synthesis of extremely reducing divalent f-block metal complexes that are of interest for a wide range of applications.
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Affiliation(s)
- Sergely Steephen Bokouende
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - D Nuwangi Kulasekara
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Sara A Worku
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Cassandra L Ward
- Lumigen Instrument Center, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Aravind B Kajjam
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Jacob C Lutter
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
| | - Matthew J Allen
- Department of Chemistry, Wayne State University, 5101 Cass Avenue, Detroit, Michigan 48202, United States
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3
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Flosbach NT, Rasche B, Rochels L, Disch S, Wickleder C, Adlung M, Fischer P, Wickleder MS. The Divalent Lanthanoid Triflates Ln(CF 3SO 3) 2(CH 3CN) (Ln=Sm, Eu): Structure, Luminescence, and Magnetism. Chemistry 2024; 30:e202400462. [PMID: 38501801 DOI: 10.1002/chem.202400462] [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: 02/01/2024] [Revised: 03/12/2024] [Accepted: 03/14/2024] [Indexed: 03/20/2024]
Abstract
The reaction of the trivalent lanthanoide triflates Ln(OTf)3 (Ln=Sm, Eu; OTf=CF3SO3 -) with the respective metals in acetonitrile leads to the Ln(II)-triflates Eu(OTf)2(CH3CN) (monoclinic, P21/n, Z=4, a=1053.54(1), b=610.28(5), c=1946.92(2) pm, β =98.611(4)) and Sm(OTf)2(CH3CN) (monoclinic, P21/n, Z=4, a=1054.41(4), b=612.16(2), c=1952.65(7) pm, β =98.524(2)). The isotypic strontium compound Sr(OTf)2(CH3CN) (monoclinic, P21/n, Z=4, a=1056.39(5), b=610.05(3), c=1950.1(1) pm, β =98.900(2)°) has been obtained from SrCO3 and triflic acid. The compounds have been investigated by X-ray diffraction, vibrational spectroscopy, luminescence spectroscopy, cyclic voltammetry, thermal analysis, and magnetic measurements.
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Affiliation(s)
- Niko T Flosbach
- Universität zu Köln, Institut für Anorganische Chemie, Greinstraße 6, 50939, Köln, Germany
| | - Bertold Rasche
- Universität Stuttgart, Institut für Anorganische Chemie, Pfaffenwaldring 55, 70569, Stuttgart
| | - Leonhard Rochels
- Universität Duisburg-Essen, Anorganische Chemie und Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstraße 5-7, 45141, Essen
| | - Sabrina Disch
- Universität Duisburg-Essen, Anorganische Chemie und Center for Nanointegration Duisburg-Essen (CENIDE), Universitätsstraße 5-7, 45141, Essen
| | - Claudia Wickleder
- Universität Siegen, Department Chemie/Biologie Anorganische Chemie, Adolf-Reichwein-Straße, 57068, Siegen
| | - Matthias Adlung
- Universität Siegen, Department Chemie/Biologie Anorganische Chemie, Adolf-Reichwein-Straße, 57068, Siegen
| | - Pia Fischer
- Universität Siegen, Department Chemie/Biologie Anorganische Chemie, Adolf-Reichwein-Straße, 57068, Siegen
| | - Mathias S Wickleder
- Universität zu Köln, Institut für Anorganische Chemie, Greinstraße 6, 50939, Köln, Germany
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4
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Yoshioka K, Iwasaki H, Hanaki M, Ito S, Iwamoto Y, Ichihara R, Nambu H. A SmI 2-mediated reductive cyclisation reaction using the trifluoroacetamide group as the radical precursor. Org Biomol Chem 2024; 22:1988-1992. [PMID: 38363092 DOI: 10.1039/d3ob02040a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2024]
Abstract
A samarium(II)-mediated reductive cyclisation reaction with the aminoketyl radical from the trifluoroacetamide group for synthesising 2-trifluoromethylindolines was developed. This reaction is the first example of using an acyclic amide group, which is considered difficult to react with SmI2, in a reductive cyclisation. Additionally, the conversion of the obtained product into 2-trifluoromethylindole was achieved.
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Affiliation(s)
- Kota Yoshioka
- Kyoto Pharmaceutical University, 1 Misasagi-Shichono-cho, Yamashina-ku, Kyoto, 607-8412, Japan.
| | - Hiroki Iwasaki
- Kyoto Pharmaceutical University, 1 Misasagi-Shichono-cho, Yamashina-ku, Kyoto, 607-8412, Japan.
| | - Mako Hanaki
- Kyoto Pharmaceutical University, 1 Misasagi-Shichono-cho, Yamashina-ku, Kyoto, 607-8412, Japan.
| | - Saho Ito
- Kyoto Pharmaceutical University, 1 Misasagi-Shichono-cho, Yamashina-ku, Kyoto, 607-8412, Japan.
| | - Yuzuha Iwamoto
- Kyoto Pharmaceutical University, 1 Misasagi-Shichono-cho, Yamashina-ku, Kyoto, 607-8412, Japan.
| | - Rio Ichihara
- Kyoto Pharmaceutical University, 1 Misasagi-Shichono-cho, Yamashina-ku, Kyoto, 607-8412, Japan.
| | - Hisanori Nambu
- Kyoto Pharmaceutical University, 1 Misasagi-Shichono-cho, Yamashina-ku, Kyoto, 607-8412, Japan.
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Li T, Sun Z, Zhang S, Ma Q, Chen Y, Yuan Y, Jia X. Single-Electron Reduction of "Push-Pull" C-C Single Bond and Decyanation Using Tertiary Amines as the Organic Electron Donor. J Org Chem 2024; 89:2516-2524. [PMID: 38319086 DOI: 10.1021/acs.joc.3c02542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Using commercially available tertiary amines as an organic electron donor (OED), the reduction of "push-pull" C-C single bond and reductive decyanation of tetrahydroisoquinolines were realized. These reactions exhibited higher reaction efficiency and better functional group tolerance compared with those of metallic reductants, and the mechanistic study indicated that a radical intermediate was involved in the reduction of the C-C single bond, which provides a new way to the OED-enabled mild reduction.
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Affiliation(s)
- Tong Li
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, China
| | - Zheng Sun
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, China
- Economic Development Bureau, Jiangsu Hangji Hi-tech Industrial Development Zone, Yangzhou 225111, Jiangsu, China
| | - Shuwei Zhang
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, China
| | - Qiyuan Ma
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, China
| | - Yuqin Chen
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, China
| | - Yu Yuan
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, China
| | - Xiaodong Jia
- School of Chemistry & Chemical Engineering, Yangzhou University, Yangzhou 225002, Jiangsu, China
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6
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Tomar M, Bhimpuria R, Kocsi D, Thapper A, Borbas KE. Photocatalytic Generation of Divalent Lanthanide Reducing Agents. J Am Chem Soc 2023; 145:22555-22562. [PMID: 37796974 PMCID: PMC10591332 DOI: 10.1021/jacs.3c07508] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2023] [Indexed: 10/07/2023]
Abstract
Divalent lanthanide (Ln) compounds are excellent reducing agents with unique reactivity profiles. These reagents are typically used in superstoichiometric amounts, often in combination with harmful additives. Reactions catalytic in Ln(II) reagents that retain the reactivity and selectivity of the stoichiometric transformations are currently lacking due to the absence of effective and selective methods to form reactive Ln(II) species from stable precursors. Here, active Ln(II) is generated from a Ln(III) precursor through reduction by a photoexcited coumarin or carbostyril chromophore, which, in turn, is regenerated by a sacrificial reductant. The reductant can be metallic (Zn) or organic (amines) and can be used in strictly stoichiometric amounts. A broad range of reactions, including C-halogen, C═C, C═X (X = O, N), P═O, and N═N reductions, as well as C-C, C-X (X = N, S, P), and N-N couplings were readily carried out in yields and selectivities comparable to or better than those afforded by the analogous stoichiometric transformations. The reaction outcomes could be altered by changing the ligand or the lanthanide or through the addition of environmentally benign additives (e.g., water). EPR spectroscopy supported the formation of both Ln(II) and oxidized chromophore intermediates. Taken together, these results establish photochemical Ln(II) generation as a powerful strategy for rendering Ln(II)-mediated reactions catalytic.
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Affiliation(s)
| | | | - Daniel Kocsi
- Department of Chemistry,
Ångström Laboratory, Uppsala
University, Uppsala 75120, Sweden
| | - Anders Thapper
- Department of Chemistry,
Ångström Laboratory, Uppsala
University, Uppsala 75120, Sweden
| | - K. Eszter Borbas
- Department of Chemistry,
Ångström Laboratory, Uppsala
University, Uppsala 75120, Sweden
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7
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Chowdhury T, Evans MJ, Coles MP, Bailey AG, Peveler WJ, Wilson C, Farnaby JH. Reduction chemistry yields stable and soluble divalent lanthanide tris(pyrazolyl)borate complexes. Chem Commun (Camb) 2023; 59:2134-2137. [PMID: 36727241 DOI: 10.1039/d2cc03189b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Reduction of the heteroleptic Ln(III) precursors [Ln(Tp)2(OTf)] (Tp = hydrotris(1-pyrazolyl)borate; OTf = triflate) with either an aluminyl(I) anion or KC8 yielded the adduct-free homoleptic Ln(II) complexes dimeric 1-Eu [{Eu(Tp)(μ-κ1:η5-Tp)}2] and monomeric 1-Yb [Yb(Tp)2]. Complexes 1-Ln have good solubility and stability in both non-coordinating and coordinating solvents. Reaction of 1-Ln with 2 Ph3PO yielded 1-Ln(OPPh3)2. All complexes are intensely coloured and 1-Eu is photoluminescent. The electronic absorption data show the 4f-5d electronic transitions in Ln(II). Single-crystal X-ray diffraction data reveal first μ-κ1:η5-coordination mode of the unsubstituted Tp ligand to lanthanides in 1-Eu.
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Affiliation(s)
- Tajrian Chowdhury
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Matthew J Evans
- School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Martyn P Coles
- School of Chemical and Physical Sciences, Victoria University of Wellington, PO Box 600, Wellington 6140, New Zealand
| | - Anna G Bailey
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - William J Peveler
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Claire Wilson
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK.
| | - Joy H Farnaby
- School of Chemistry, Joseph Black Building, University of Glasgow, Glasgow, G12 8QQ, UK.
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8
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Mahieu N, Piątkowski J, Simler T, Nocton G. Back to the future of organolanthanide chemistry. Chem Sci 2023; 14:443-457. [PMID: 36741512 PMCID: PMC9848160 DOI: 10.1039/d2sc05976b] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2022] [Accepted: 11/29/2022] [Indexed: 12/02/2022] Open
Abstract
At the dawn of the development of structural organometallic chemistry, soon after the discovery of ferrocene, the description of the LnCp3 complexes, featuring large and mostly trivalent lanthanide ions, was rather original and sparked curiosity. Yet, the interest in these new architectures rapidly dwindled due to the electrostatic nature of the bonding between π-aromatic ligands and 4f-elements. Almost 70 years later, it is interesting to focus on how the discipline has evolved in various directions with the reports of multiple catalytic reactivities, remarkable potential in small molecule activation, and the development of rich redox chemistry. Aside from chemical reactivity, a better understanding of their singular electronic nature - not precisely as simplistic as anticipated - has been crucial for developing tailored compounds with adapted magnetic anisotropy or high fluorescence properties that have witnessed significant popularity in recent years. Future developments shall greatly benefit from the detailed reactivity, structural and physical chemistry studies, particularly in photochemistry, electro- or photoelectrocatalysis of inert small molecules, and manipulating the spins' coherence in quantum technology.
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Affiliation(s)
- Nolwenn Mahieu
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay91120 PalaiseauFrance
| | - Jakub Piątkowski
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay91120 PalaiseauFrance
| | - Thomas Simler
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay91120 PalaiseauFrance
| | - Grégory Nocton
- LCM, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay91120 PalaiseauFrance
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9
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Facile Solvent-Free Mechanochemical Synthesis of UI3 and Lanthanoid Iodides. CHEMISTRY 2022. [DOI: 10.3390/chemistry4040108] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Lewis base-free lanthanoid (Ln) and actinoid (An) iodides are difficult to obtain, as standard protocols describe syntheses in solutions of donor solvents which are ultimately hard to remove. We have now established a mechanochemical approach towards the synthesis of Lewis base-free f-block metal iodides with excellent yields. In particular, we describe herein the synthesis of EuI2 as an example of a divalent lanthanoid iodide, of CeI3 as an example of a trivalent lanthanoid iodide, and of UI3 as the most important actinoid iodide. Each can be obtained in high yield with minimal work-up, presenting the most efficient and simple synthetic route to access these materials to date.
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10
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Boyd EA, Peters JC. Sm(II)-Mediated Proton-Coupled Electron Transfer: Quantifying Very Weak N-H and O-H Homolytic Bond Strengths and Factors Controlling Them. J Am Chem Soc 2022; 144:21337-21346. [PMID: 36346706 PMCID: PMC10281198 DOI: 10.1021/jacs.2c09580] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Coordination of alcohols to the single-electron reductant samarium diiodide (SmI2) results in substantial O-H bond weakening, affording potent proton-coupled electron transfer (PCET) reagents. However, poorly defined speciation of SmI2 in tetrahydrofuran (THF)/alcohol mixtures limits reliable thermodynamic analyses of such systems. Rigorous determination of bond dissociation free energy (BDFE) values in such Sm systems, important to evaluating their reactivity profiles, motivates studies of model Sm systems where contributing factors can be teased apart. Here, a bulky and strongly chelating macrocyclic ligand ((tBu2ArOH)2Me2cyclam) maintains solubility, eliminates dimerization pathways, and facilitates clean electrochemical behavior in a well-defined functional model for the PCET reactivity of SmII with coordinating proton sources. Direct measurement of thermodynamic parameters enables reliable experimental estimation of the BDFEs in 2-pyrrolidone and MeOH complexes of ((tBu2ArO)2Me2cyclam)SmII, thereby revealing exceptionally weak N-H and O-H BDFEs of 27.2 and <24.1 kcal mol-1, respectively. Expanded thermochemical cycles reveal that this bond weakening stems from the very strongly reducing SmII center and the formation of strong SmIII-alkoxide (and -pyrrolidonate) interactions in the PCET products. We provide a detailed analysis comparing these BDFE values with those that have been put forward for SmI2 in THF in the presence of related proton donors. We suggest that BDFE values for the latter systems may in fact be appreciably higher than the system described herein. Finally, protonation and electrochemical reduction steps necessary for the regeneration of the PCET donors from SmIII-alkoxides are demonstrated, pointing to future strategies aimed at achieving (electro)catalytic turnover using SmII-based PCET reagents.
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Affiliation(s)
- Emily A Boyd
- Division of Chemistry and Chemical Engineering, California Institute of Technology (Caltech), Pasadena, California 91125, United States
| | - Jonas C Peters
- Division of Chemistry and Chemical Engineering, California Institute of Technology (Caltech), Pasadena, California 91125, United States
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11
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Bokouende SS, Jenks TC, Ward CL, Allen MJ. Solid-state and solution-phase characterization of Sm II-aza[2.2.2]cryptate and its methylated analogue. Dalton Trans 2022; 51:10852-10855. [PMID: 35781473 PMCID: PMC9650674 DOI: 10.1039/d2dt01823c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Two new SmII-azacryptates are reported that differ in steric hindrance and Lewis basicity of donor atoms. The sterically hindered complex has a smaller coordination number and a more negative electrochemical potential than the complex with less steric hindrance.
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Affiliation(s)
| | - Tyler C Jenks
- Deparptment of Chemistry, Wayne State University, 5101 Cass Ave., Detroit, MI 48202, USA.
| | - Cassandra L Ward
- Lumigen Instrument Center, Wayne State University, 5101 Cass Ave., Detroit, MI 48202, USA
| | - Matthew J Allen
- Deparptment of Chemistry, Wayne State University, 5101 Cass Ave., Detroit, MI 48202, USA.
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12
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Klementyeva SV, Schrenk C, Schnepf A. Oxidation of [Ge 9{Si(SiMe 3) 3} 3] − with LnI 3 (Ln = Eu, Sm, Yb): Isomerism of Metalloid Germanium Clusters. Inorg Chem 2022; 61:11787-11795. [DOI: 10.1021/acs.inorgchem.2c01501] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Claudio Schrenk
- Chemistry Department, University Tübingen, Auf der Morgenstelle 18, 72076 Tübingen Germany
| | - Andreas Schnepf
- Chemistry Department, University Tübingen, Auf der Morgenstelle 18, 72076 Tübingen Germany
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13
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Rao CN, Reissig HU. Samarium(II)‐Promoted Cyclizations of Non‐activated Indolyl Sulfinyl Imines to Polycyclic Tertiary Carbinamines. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200264] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Chintada Nageswara Rao
- Freie Universität Berlin: Freie Universitat Berlin Institut für Chemie und Biochemie 14195 Berlin GERMANY
| | - Hans-Ulrich Reissig
- Freie Universität Berlin Institut für Chemie und Biochemie Takustr. 3 14195 Berlin GERMANY
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14
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He Y, Wang Y, Li SJ, Lan Y, Wang X. Deoxygenative Cross-Coupling of Aromatic Amides with Polyfluoroarenes. Angew Chem Int Ed Engl 2022; 61:e202115497. [PMID: 35014163 DOI: 10.1002/anie.202115497] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Indexed: 01/17/2023]
Abstract
Considering the ubiquitous nature and ready synthesis of amides, and the great significance of organofluorine-containing species, the cross-coupling of amides and polyfluoroarenes, leading to new carbon-carbon bond-forming methodologies, would find useful applications in synthesis, late-stage functionalization, and rapid generation of molecular diversity. Herein, we present a novel synthesis of α-polyfluoroaryl amines via Sm/SmI2 -mediated deoxygenative cross-coupling of aromatic amides with polyfluoroarenes through direct C-H functionalization. The structural and functional diversity of these readily available precursors provides a versatile and flexible strategy for the streamlined synthesis of α-polyfluoroaryl amines. Combining experimental and theoretical studies, a novel plausible mechanism of the α-aminocarbene-mediated C-H insertion has been revealed, which may stimulate future work for the development of novel methods in amine synthesis.
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Affiliation(s)
- Youliang He
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Yuxiao Wang
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Shi-Jun Li
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China
| | - Yu Lan
- Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou, 450001, China.,School of Chemistry and Chemical Engineering, Chongqing Key Laboratory of Theoretical and Computational Chemistry, Chongqing University, Chongqing, 400030, China
| | - Xiaoming Wang
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, University of Chinese Academy of Sciences, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China.,School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou, 310024, China
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15
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Reactivity of a Sterical Flexible Pentabenzylcyclopentadienyl Samarocene. INORGANICS 2022. [DOI: 10.3390/inorganics10020025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/10/2022] Open
Abstract
Reactivity studies of the classical divalent lanthanide compound [CpBz52Sm] (CpBz5 = pentabenzylcyclopentadienyl-anion) towards diphenyl dichalcogenides and d-element carbonyl complexes led to remarkable results. In the compounds obtained, a different number of Sm-C(phenyl) interactions and differently oriented benzyl groups were observed, suggesting—despite the preference of these interactions in [CpBz52Sm] described in previous studies—a flexible orientation of the benzyl groups and thus a variable steric shielding of the metal center by the ligand. The obtained compounds are either present as monometallic complexes (reduction of the dichalcogenides) or tetrametallic bridged compounds in the case of the d/f-element carbonyl complexes.
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16
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He Y, Wang Y, Li S, Lan Y, Wang X. Deoxygenative Cross‐Coupling of Aromatic Amides with Polyfluoroarenes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202115497] [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)
- Youliang He
- State Key Laboratory of Organometallic Chemistry Center for Excellence in Molecular Synthesis Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
| | - Yuxiao Wang
- State Key Laboratory of Organometallic Chemistry Center for Excellence in Molecular Synthesis Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
| | - Shi‐Jun Li
- Green Catalysis Center, and College of Chemistry Zhengzhou University Zhengzhou 450001 China
| | - Yu Lan
- Green Catalysis Center, and College of Chemistry Zhengzhou University Zhengzhou 450001 China
- School of Chemistry and Chemical Engineering Chongqing Key Laboratory of Theoretical and Computational Chemistry Chongqing University Chongqing 400030 China
| | - Xiaoming Wang
- State Key Laboratory of Organometallic Chemistry Center for Excellence in Molecular Synthesis Shanghai Institute of Organic Chemistry University of Chinese Academy of Sciences Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
- School of Chemistry and Materials Science Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences 1 Sub-lane Xiangshan Hangzhou 310024 China
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17
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Mellah M, Zhang YF. Samarium(II)-Electrocatalyzed Chemoselective Reductive Alkoxylation of Phthalimides. Org Chem Front 2022. [DOI: 10.1039/d1qo01760h] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The unprecedented samarium-eletrocatalyzed reductive alkoxylation of phthalimides in a single step is presented. Under mild conditions, using electrogenerated Sm(II) with TMSCl (trimethyl chlorosilane), N-substituted 3-alkoxyl isoindolin-1-ones are isolated in good...
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18
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Jiao J, Wang X. Merging Electron Transfer with 1,2-Metalate Rearrangement: Deoxygenative Arylation of Aromatic Amides with Arylboronic Esters. Angew Chem Int Ed Engl 2021; 60:17088-17093. [PMID: 33988285 DOI: 10.1002/anie.202104359] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 04/28/2021] [Indexed: 12/15/2022]
Abstract
Amides are essentially inert carboxyl derivatives in many types of chemical transformations. In particular, deoxygenative C-C bond formation of amides to synthetically important amines is a long-standing challenge for synthetic chemists due to the inertness of the resonance-stabilized amide C=O bond. Herein, it is disclosed that by merging electron-transfer-induced activation with 1,2-metalate rearrangement, a wide range of aromatic amides react smoothly with arylboron reagents, affording a series of biologically relevant diarylmethylamines as deoxygenative C-C bond cross-coupling products. With its simplicity and versatility, this reaction shows great promise in the synthesis of amines from amides, which may open up new avenues in retrosynthetic planning and find widespread use in academia and industry.
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Affiliation(s)
- Jiwen Jiao
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China
| | - Xiaoming Wang
- State Key Laboratory of Organometallic Chemistry, Center for Excellence in Molecular Synthesis, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, 345 Lingling Road, Shanghai, 200032, China.,School of Chemistry and Materials Science, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, 1 Sub-lane Xiangshan, Hangzhou, 310024, China
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19
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Berger T, Lebon J, Maichle‐Mössmer C, Anwander R. CeCl
3
/
n
‐BuLi: Enträtselung von Imamotos Organocer‐Reagenz. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202103889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Tassilo Berger
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Deutschland
| | - Jakob Lebon
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Deutschland
| | - Cäcilia Maichle‐Mössmer
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Deutschland
| | - Reiner Anwander
- Institut für Anorganische Chemie Eberhard Karls Universität Tübingen Auf der Morgenstelle 18 72076 Tübingen Deutschland
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20
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Jiao J, Wang X. Merging Electron Transfer with 1,2‐Metalate Rearrangement: Deoxygenative Arylation of Aromatic Amides with Arylboronic Esters. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202104359] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jiwen Jiao
- State Key Laboratory of Organometallic Chemistry Center for Excellence in Molecular Synthesis Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
| | - Xiaoming Wang
- State Key Laboratory of Organometallic Chemistry Center for Excellence in Molecular Synthesis Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 China
- School of Chemistry and Materials Science Hangzhou Institute for Advanced Study University of Chinese Academy of Sciences 1 Sub-lane Xiangshan Hangzhou 310024 China
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21
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Frenette BL, Arsenault N, Walker SL, Decken A, Dyker CA. Bis(Iminophosphorano)-Substituted Pyridinium Ions and their Corresponding Bispyridinylidene Organic Electron Donors. Chemistry 2021; 27:8528-8536. [PMID: 33834560 DOI: 10.1002/chem.202100318] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Indexed: 12/22/2022]
Abstract
Optimized synthetic procedures for pyridinium ions featuring iminophosphorano (-N=PR3 ; R=Ph, Cy) π-donor substituents in the 2- and 4- positions are described. Crystallographic and theoretical studies reveal that the strongly donating substituents severely polarize the π-electrons of the pyridyl ring at the expense of aromaticity. Moreover, the pyridinium ions are readily deprotonated to generate powerful bispyridinylidene (BPY) organic electron donors. Electrochemical studies show exceptionally low redox potentials for the two-electron BPY/BPY2+ couples, ranging from -1.71 V vs the saturated calomel electrode for 3PhPh (with four Ph3 P=N- groups) to -1.85 V for 3CyCy (with four Cy3 P=N- groups). These new compounds represent the most reducing neutral organic electron donors (OEDs) currently known. Some preliminary reductions involving 3CyCy showed enhanced capability owing to its low redox potential, such as the thermally activated reduction of an aryl chloride, but purification challenges were often encountered.
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Affiliation(s)
- Brandon L Frenette
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada
| | - Nadine Arsenault
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada
| | - Sarah L Walker
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada
| | - Andreas Decken
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada
| | - C Adam Dyker
- Department of Chemistry, University of New Brunswick, Fredericton, New Brunswick, E3B 5A3, Canada
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22
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Berger T, Lebon J, Maichle-Mössmer C, Anwander R. CeCl 3 /n-BuLi: Unraveling Imamoto's Organocerium Reagent. Angew Chem Int Ed Engl 2021; 60:15622-15631. [PMID: 33905590 PMCID: PMC8362106 DOI: 10.1002/anie.202103889] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2021] [Indexed: 12/31/2022]
Abstract
CeCl3(thf) reacts at low temperatures with MeLi, t‐BuLi, and n‐BuLi to isolable organocerium complexes. Solvent‐dependent extensive n‐BuLi dissociation is revealed by 7Li NMR spectroscopy, suggesting “Ce(n‐Bu)3(thf)x” or solvent‐separated ion pairs like “[Li(thf)4][Ce(n‐Bu)4(thf)y]” as the dominant species of the Imamoto reagent. The stability of complexes Li3Ln(n‐Bu)6(thf)4 increases markedly with decreasing LnIII size. Closer inspection of the solution behavior of crystalline Li3Lu(n‐Bu)6(thf)4 and mixtures of LuCl3(thf)2/n‐BuLi in THF indicates occurring n‐BuLi dissociation only at molar ratios of <1:3. n‐BuLi‐depleted complex LiLu(n‐Bu)3Cl(tmeda)2 was obtained by treatment of Li2Lu(n‐Bu)5(tmeda)2 with ClSiMe3, at the expense of LiCl incorporation. Imamoto's ketone/tertiary alcohol transformation was examined with 1,3‐diphenylpropan‐2‐one, affording 99 % of alcohol.
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Affiliation(s)
- Tassilo Berger
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany
| | - Jakob Lebon
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany
| | - Cäcilia Maichle-Mössmer
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany
| | - Reiner Anwander
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen, Auf der Morgenstelle 18, 72076, Tübingen, Germany
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23
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Martínez J, de la Cruz-Martínez F, Martínez de Sarasa Buchaca M, Fernández-Baeza J, Sánchez-Barba LF, North M, Castro-Osma JA, Lara-Sánchez A. Efficient Synthesis of Cyclic Carbonates from Unsaturated Acids and Carbon Dioxide and their Application in the Synthesis of Biobased Polyurethanes. Chempluschem 2021; 86:460-468. [PMID: 33704907 DOI: 10.1002/cplu.202100079] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2021] [Revised: 03/01/2021] [Indexed: 11/05/2022]
Abstract
Bio-derived furan- and diacid-derived cyclic carbonates have been synthesized in high yields from terminal epoxides and CO2 . Furthermore, four highly substituted terpene-derived cyclic carbonates were isolated in good yields with excellent diastereoselectivity in some cases. Eleven new cyclic carbonates derived from 10-undecenoic acid under mild reaction conditions were prepared, providing the corresponding carbonate products in excellent yields. The catalyst system also performed the conversion of an epoxidized fatty acid n-pentyl ester into a cyclic carbonate under relatively mild reaction conditions (80 °C, 20 bar, 24 h). This bis(cyclic carbonate) was obtained in high yields and with different cis/trans ratios depending on the co-catalyst used. An allyl alcohol by-product was only observed as a minor product when bis(triphenylphosphine)iminium chloride was used as co-catalyst. Finally, two cyclic carbonates were used as building blocks for the preparation of non-isocyanate poly(hydroxy)urethanes by reaction with 1,4-diaminobutane.
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Affiliation(s)
- Javier Martínez
- Instituto de Ciencias Químicas, Facultad de Ciencias, Isla Teja, Universidad Austral de Chile, 5090000, Valdivia, Chile
| | - Felipe de la Cruz-Martínez
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Avda. Camilo José Cela, 10, 13071, Ciudad Real, Spain.,Facultad de Farmacia, 02006, Albacete, Spain
| | - Marc Martínez de Sarasa Buchaca
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Avda. Camilo José Cela, 10, 13071, Ciudad Real, Spain.,Facultad de Farmacia, 02006, Albacete, Spain
| | - Juan Fernández-Baeza
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Avda. Camilo José Cela, 10, 13071, Ciudad Real, Spain.,Facultad de Farmacia, 02006, Albacete, Spain
| | - Luis F Sánchez-Barba
- Departamento de Biología y Geología, Física y Química Inorgánica, Universidad Rey Juan Carlos, Móstoles, Madrid, 28933, Spain
| | - Michael North
- Green Chemistry Centre of Excellence, Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - José A Castro-Osma
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Avda. Camilo José Cela, 10, 13071, Ciudad Real, Spain.,Facultad de Farmacia, 02006, Albacete, Spain
| | - Agustín Lara-Sánchez
- Universidad de Castilla-La Mancha, Departamento de Química Inorgánica, Orgánica y Bioquímica-Centro de Innovación en Química Avanzada (ORFEO-CINQA), Facultad de Ciencias y Tecnologías Químicas, Avda. Camilo José Cela, 10, 13071, Ciudad Real, Spain.,Facultad de Farmacia, 02006, Albacete, Spain
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24
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Olea F, Rosales G, Quintriqueo A, Romero J, Pizarro J, Ortiz C, Quijada-Maldonado E. Theoretical prediction of selectivity in solvent extraction of La(III) and Ce(III) from aqueous solutions using β-diketones as extractants and kerosene and two imidazolium-based ionic liquids as diluents via quantum chemistry and COSMO-RS calculations. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114655] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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25
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Moutet J, Schleinitz J, La Droitte L, Tricoire M, Pointillart F, Gendron F, Simler T, Clavaguéra C, Le Guennic B, Cador O, Nocton G. Bis‐Cyclooctatetraenyl Thulium(II): Highly Reducing Lanthanide Sandwich Single‐Molecule Magnets. Angew Chem Int Ed Engl 2021; 60:6042-6046. [DOI: 10.1002/anie.202015428] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Jules Moutet
- LCM CNRS Ecole polytechnique Institut Polytechnique Paris Route de Saclay 91128 Palaiseau, cedex France
| | - Jules Schleinitz
- LCM CNRS Ecole polytechnique Institut Polytechnique Paris Route de Saclay 91128 Palaiseau, cedex France
| | - Léo La Droitte
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes)–UMR 6226 35000 Rennes France
| | - Maxime Tricoire
- LCM CNRS Ecole polytechnique Institut Polytechnique Paris Route de Saclay 91128 Palaiseau, cedex France
| | - Fabrice Pointillart
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes)–UMR 6226 35000 Rennes France
| | - Frédéric Gendron
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes)–UMR 6226 35000 Rennes France
| | - Thomas Simler
- LCM CNRS Ecole polytechnique Institut Polytechnique Paris Route de Saclay 91128 Palaiseau, cedex France
| | - Carine Clavaguéra
- Université Paris-Saclay CNRS Institut de Chimie Physique UMR 8000 91405 Orsay cedex France
| | - Boris Le Guennic
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes)–UMR 6226 35000 Rennes France
| | - Olivier Cador
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes)–UMR 6226 35000 Rennes France
| | - Grégory Nocton
- LCM CNRS Ecole polytechnique Institut Polytechnique Paris Route de Saclay 91128 Palaiseau, cedex France
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26
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Moutet J, Schleinitz J, La Droitte L, Tricoire M, Pointillart F, Gendron F, Simler T, Clavaguéra C, Le Guennic B, Cador O, Nocton G. Bis‐Cyclooctatetraenyl Thulium(II): Highly Reducing Lanthanide Sandwich Single‐Molecule Magnets. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202015428] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Jules Moutet
- LCM CNRS Ecole polytechnique Institut Polytechnique Paris Route de Saclay 91128 Palaiseau, cedex France
| | - Jules Schleinitz
- LCM CNRS Ecole polytechnique Institut Polytechnique Paris Route de Saclay 91128 Palaiseau, cedex France
| | - Léo La Droitte
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes)–UMR 6226 35000 Rennes France
| | - Maxime Tricoire
- LCM CNRS Ecole polytechnique Institut Polytechnique Paris Route de Saclay 91128 Palaiseau, cedex France
| | - Fabrice Pointillart
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes)–UMR 6226 35000 Rennes France
| | - Frédéric Gendron
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes)–UMR 6226 35000 Rennes France
| | - Thomas Simler
- LCM CNRS Ecole polytechnique Institut Polytechnique Paris Route de Saclay 91128 Palaiseau, cedex France
| | - Carine Clavaguéra
- Université Paris-Saclay CNRS Institut de Chimie Physique UMR 8000 91405 Orsay cedex France
| | - Boris Le Guennic
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes)–UMR 6226 35000 Rennes France
| | - Olivier Cador
- Univ Rennes CNRS ISCR (Institut des Sciences Chimiques de Rennes)–UMR 6226 35000 Rennes France
| | - Grégory Nocton
- LCM CNRS Ecole polytechnique Institut Polytechnique Paris Route de Saclay 91128 Palaiseau, cedex France
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27
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Lyubov DM, Trifonov AA. Ln( ii) alkyl complexes: from elusive exotics to catalytic applications. Inorg Chem Front 2021. [DOI: 10.1039/d1qi00206f] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis, structures and reactivity of isolable LnII (Ln = Sm, Eu, Yb) alkyl complexes are discussed. The application of LnII alkyl derivatives in a variety of catalytic reactions is considered as well.
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Affiliation(s)
- Dmitry M. Lyubov
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
| | - Alexander A. Trifonov
- Institute of Organometallic Chemistry of Russian Academy of Sciences
- Nizhny Novgorod
- Russia
- Institute of Organoelement Compounds of Russian Academy of Sciences
- Moscow
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28
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Doler C, Friess M, Lackner F, Weber H, Fischer RC, Breinbauer R. Stereoselective synthesis of chiral thiol-containing 1,2-aminoalcohols via SmI2-mediated coupling. Tetrahedron 2020. [DOI: 10.1016/j.tet.2020.131249] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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29
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Marks WR, Baumgardner DF, Reinheimer EW, Gilbertson JD. Complete denitrification of nitrate and nitrite to N 2 gas by samarium(II) iodide. Chem Commun (Camb) 2020; 56:11441-11444. [PMID: 32851391 DOI: 10.1039/d0cc04115g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
The reduction of nitrogen oxides (NxOyn-) to dinitrogen gas by samarium(ii) iodide is reported. The polyoxoanions nitrate (NO3-) and nitrite (NO2-), as well as nitrous oxide (N2O) and nitric oxide (NO) were all shown to react with stoichiometric amounts of SmI2 in THF for the complete denitrification to N2.
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Affiliation(s)
- Walker R Marks
- Department of Chemistry, Western Washington University, Bellingham, Washington 98225, USA.
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30
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Zheng Y, Cao CS, Ma W, Chen T, Wu B, Yu C, Huang Z, Yin J, Hu HS, Li J, Zhang WX, Xi Z. 2-Butene Tetraanion Bridged Dinuclear Samarium(III) Complexes via Sm(II)-Mediated Reduction of Electron-Rich Olefins. J Am Chem Soc 2020; 142:10705-10714. [PMID: 32408744 DOI: 10.1021/jacs.0c01690] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
While reduction reactions are ubiquitous in chemistry, it is very challenging to further reduce electron-rich compounds, especially the anionic ones. In this work, the reduction of 1,3-butadienyl dianion, the anionic conjugated olefin, has been realized by divalent rare-earth metal compounds (SmI2), resulting in the formation of novel 2-butene tetraanion bridged disamarium(III) complexes. Density functional theory (DFT) analyses reveal two features: (i) the single electron transfer (SET) from 4f atomic orbitals (AOs) of each Sm center to the antibonding π*-orbitals of 1,3-butadienyl dianion is feasible and the new HOMO formed by the bonding interaction between Sm 5d orbitals (AOs) and the π*-orbitals of 1,3-butadienyl dianion can accept favorably 2e- from 4f AOs of Sm(II); (ii) the 2-butene tetraanionic ligand serves as a unique 10e- donating system, in which 4e- act as two σ-donation bonding interactions while the rest 6e- as three π-donation bonding interactions. The disamarium(III) complexes represent a unique class of the bridged bis-alkylidene rare-earth organometallic complexes. The ligand-based reductive reactivity of 2-butene tetraanion bridged disamarium(III) complexes demonstrates that 2-butene tetraanionic ligand serves as a 3e- reductant toward cyclooctatetraene (COT) to provide doubly COT-supported disamarabutadiene complexes. The reaction of the disamarium(III) complexes with Cp*Li produces the doubly Cp*-coordinated Sm(III) complexes via salt metathesis. In addition, the reaction with Mo(CO)6 affords the oxycyclopentadienyl dinuclear complex via CO insertion.
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Affiliation(s)
- Yu Zheng
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Chang-Su Cao
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Wangyang Ma
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Tianyang Chen
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Botao Wu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Chao Yu
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Zhe Huang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Jianhao Yin
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Han-Shi Hu
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
| | - Jun Li
- Department of Chemistry and Key Laboratory of Organic Optoelectronics & Molecular Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China.,Department of Chemistry, Southern University of Science and Technology, Shenzhen 518055, China
| | - Wen-Xiong Zhang
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
| | - Zhenfeng Xi
- Beijing National Laboratory for Molecular Sciences (BNLMS), Key Laboratory of Bioorganic Chemistry and Molecular Engineering of Ministry of Education, College of Chemistry, Peking University, Beijing 100871, China
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31
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SmI2-promoted cross coupling reaction of N-2-bromoethylphthalimide and carbonyl compounds: Synthesis of α-aryl-α′-hydroxy ketones. Tetrahedron 2020. [DOI: 10.1016/j.tet.2019.130839] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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32
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Bayer U, Anwander R. Carbonyl group and carbon dioxide activation by rare-earth-metal complexes. Dalton Trans 2020; 49:17472-17493. [PMID: 33232414 DOI: 10.1039/d0dt03578e] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
The rare-earth elements (Ln = Sc, Y, La-Lu) are widely used in stoichiometric and catalytic carbonyl group transformations. Sufficient availability, non-toxicity, high oxophilicity, tunable ion size/Lewis acidity and enhanced ligand exchangeability have been major driving factors for their successful implementation. Routinely employed reagents for stoichiometric carbonyl group transformations are divalent ytterbium and samarium compounds (e.g., ketone reduction), bimetallic CeCl3/LiR (C-C coupling), or ceric ammonium nitrate CAN (cyclic ketone oxidation). Rare-earth-metal triflates, and in particular Sc(OTf)3, are prominent examples of Lewis acid catalysts for versatile use in organic synthesis (e.g., Aldol and Michael reactions). Moreover, Ln(ii) and Ln(iii) complexes efficiently catalyze the (co)polymerization of carbonyl group-containing monomers including lactones, lactides, acrylates, and carbon dioxide. Featuring the most notorious greenhouse gas, CO2 is currently assessed as a cheap, abundant, and non-toxic C1 building block. Ln(iii) complexes are not only capable of efficient CO2 capture via reversible insertion but also of CO2 activation for catalytic conversions (copolymerization/cycloaddition with epoxides). This perspective focuses on structurally elucidated Ln complexes resulting from ketone or carbonyl derivative activation/insertion as well as carbon dioxide insertion products. The respective compounds will be sorted by structural motifs and, if applicable, details on reactivity and feasibility of catalytic reactions are presented. The article is subdivided in three parts: (i) donor and insertion products of ketones and aldehydes, (ii) redox-enhanced activation of carbonyl derivatives, and (iii) CO2 insertion/redox products and homogeneous catalytic conversion.
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Affiliation(s)
- Uwe Bayer
- Institut für Anorganische Chemie, Eberhard Karls Universität Tübingen (EKUT), Auf der Morgenstelle 18, 72076 Tübingen, Germany.
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Ding Y, Luo S, Weng C, An J. Reductive Deuteration of Nitriles Using D2O as a Deuterium Source. J Org Chem 2019; 84:15098-15105. [PMID: 31610121 DOI: 10.1021/acs.joc.9b02056] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Yuxuan Ding
- College of Science, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, China
| | - Shihui Luo
- College of Science, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, China
| | - Chaoqun Weng
- College of Science, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, China
| | - Jie An
- College of Science, China Agricultural University, No. 2 Yuanmingyuan West Road, Beijing 100193, China
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Soto M, Soengas RG, Silva AMS, Gotor-Fernández V, Rodríguez-Solla H. Temperature-Controlled Stereodivergent Synthesis of 2,2'-Biflavanones Promoted by Samarium Diiodide. Chemistry 2019; 25:13104-13108. [PMID: 31361369 DOI: 10.1002/chem.201902927] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2019] [Revised: 07/29/2019] [Indexed: 12/11/2022]
Abstract
In this work, the first example of a radical stereodivergent reaction directed towards the stereoselective synthesis of both (R*,R*)- and (R*,S*)-2,2'-biflavanones promoted by samarium diiodide is reported. Control experiments showed that the selectivity of this reaction was exclusively controlled by the temperature. It was possible to generate a variety of 2,2'-biflavanones bearing different substitution patterns at the aromatic ring in good-to-quantitative yields, being both stereoisomers of the desired compounds obtained with total or high control of selectivity. A mechanism that explains both the generation of the corresponding 2,2'-biflavanones and the selectivity is also discussed. The structure and stereochemistry determination of each isomer was unequivocally elucidated by single-crystal X-ray diffraction experiments.
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Affiliation(s)
- Martín Soto
- Department of Organic and Inorganic Chemistry, University of Oviedo, Avenida Julián Clavería 8, 33006, Oviedo, Spain
| | - Raquel G Soengas
- Research Centre CIAIMBITAL, University of Almería, Carretera de Sacramento s/n, 04120, Almería, Spain
| | - Artur M S Silva
- Department of Chemistry & QOPNA, University of Aveiro, 3810-193, Aveiro, Portugal
| | - Vicente Gotor-Fernández
- Department of Organic and Inorganic Chemistry, University of Oviedo, Avenida Julián Clavería 8, 33006, Oviedo, Spain
| | - Humberto Rodríguez-Solla
- Department of Organic and Inorganic Chemistry, University of Oviedo, Avenida Julián Clavería 8, 33006, Oviedo, Spain
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Jaoul A, Tricoire M, Moutet J, Cordier M, Clavaguéra C, Nocton G. Reversible electron transfer in organolanthanide chemistry. CHEMISTRY SQUARED 2019; 3:1. [PMID: 31463472 PMCID: PMC6713560 DOI: 10.28954/2019.csq.06.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
This article relates the synthesis and characterization of novel heterobimetallic complexes containing a low-valent lanthanide, a tetradentate redox non-innocent ligand, viz. the 4,5,9,10-tetraazaphenanthrene, taphen ligand and transition metal fragments of PdMe2 and PtMe2. The experimental results are supported by a theoretical study. Investigation of their reduction properties allowed the formation of isostructural original heterotrimetallic complexes containing two Cp*2Yb fragments and the (taphen)MMe2 (M = Pd and Pt) motifs. These complexes are stable in non-coordinating solvent such as toluene but decompose in coordinating solvents such as thf. Investigation of the internal electron transfer shows that the taphen ligand behaves as a two-electrons reservoir but is capable of transferring back only one electron in thf. This reversible electron(s) transfer is rare in organolanthanide chemistry and show the potential interest of these complexes in reductive chemistry. Additionally, the trinuclear complexes feature odd X-ray crystal structures in which a deviation of symmetry is observed. The latter observation was studied in depth using quantum chemistry calculations highlighting the role of non-covalent weak interactions.
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Affiliation(s)
- Arnaud Jaoul
- LCM, CNRS, Ecole polytechnique, IP Paris, Route de Saclay, Palaiseau, France
| | - Maxime Tricoire
- LCM, CNRS, Ecole polytechnique, IP Paris, Route de Saclay, Palaiseau, France
| | - Jules Moutet
- LCM, CNRS, Ecole polytechnique, IP Paris, Route de Saclay, Palaiseau, France
| | - Marie Cordier
- LCM, CNRS, Ecole polytechnique, IP Paris, Route de Saclay, Palaiseau, France
| | - Carine Clavaguéra
- Laboratoire de Chimie Physique, CNRS-Université Paris-Sud, Université Paris-Saclay, 15 avenue Jean Perrin, 91405 Orsay Cedex, France
| | - Grégory Nocton
- LCM, CNRS, Ecole polytechnique, IP Paris, Route de Saclay, Palaiseau, France
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Beemelmanns C, Nitsch D, Bentz C, Reissig HU. Stereoselective Cascade Cyclizations with Samarium Diiodide to Tetracyclic Indolines: Precursors of Fluorostrychnines and Brucine. Chemistry 2019; 25:8780-8789. [PMID: 31033048 DOI: 10.1002/chem.201900087] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2019] [Revised: 04/25/2019] [Indexed: 12/16/2022]
Abstract
A series of γ-indolylketones with fluorine, cyano or alkoxy substituents at the benzene moiety was prepared and subjected to samarium diiodide-promoted cyclization reactions. The desired dearomatizing ketyl cascade reaction forming two new rings proceeded in all cases with high diastereoselectivity, but with differing product distribution. In most cases, the desired annulated tetracyclic compounds were obtained in moderate to good yields, but as second product tetracyclic spirolactones were isolated in up to 29 % yield. The reaction rate was influenced by the substituents at the benzene moiety of the substrate as expected, with electron-accepting groups accelerating and electron-donating groups decelerating the cyclization process. In case of a difluoro-substituted γ-indolylketone a partial defluorination was observed. The intermediate samarium enolate of the tetracyclic products could be trapped by adding reactive alkylating agents as electrophiles delivering products with quarternary carbons. In the case of a dimethoxy-substituted tetracyclic cyclization product a subsequent reductive amination stereoselectively provided a pentacyclic compound that was subsequently N-protected and subjected to a regioselective elimination. The obtained functionalized pentacyclic product should be convertible into the alkaloid brucine by four well-established steps. Overall, the presented report shows that functionalized tetracyclic compounds with different substituents are rapidly available with the samarium diiodide cascade cyclization as crucial step. Hence, analogues of the landmark alkaloid strychnine, for example, with specific fluorine substitutions, should be easily accessible.
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Affiliation(s)
- Christine Beemelmanns
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195, Berlin, Germany.,Leibniz-Institut für Naturstoff-Forschung und Infektionsbiologie, Beutenbergstraße 11a, 07745, Jena, Germany
| | - Dominik Nitsch
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195, Berlin, Germany
| | - Christoph Bentz
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195, Berlin, Germany
| | - Hans-Ulrich Reissig
- Institut für Chemie und Biochemie, Freie Universität Berlin, Takustraße 3, 14195, Berlin, Germany
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Xémard M, Cordier M, Molton F, Duboc C, Le Guennic B, Maury O, Cador O, Nocton G. Divalent Thulium Crown Ether Complexes with Field-Induced Slow Magnetic Relaxation. Inorg Chem 2019; 58:2872-2880. [DOI: 10.1021/acs.inorgchem.8b03551] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mathieu Xémard
- LCM, CNRS, Ecole Polytechnique, Université
Paris-Saclay, Route de Saclay, 91128 Palaiseau, France
| | - Marie Cordier
- LCM, CNRS, Ecole Polytechnique, Université
Paris-Saclay, Route de Saclay, 91128 Palaiseau, France
| | - Florian Molton
- Univ Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France
| | - Carole Duboc
- Univ Grenoble Alpes, CNRS UMR 5250, DCM, F-38000 Grenoble, France
| | - Boris Le Guennic
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, 35000 Rennes, France
| | - Olivier Maury
- Univ Lyon, ENS Lyon, CNRS, Université Claude Bernard Lyon 1, UMR 5182, Laboratoire de Chimie, 69342 Lyon, France
| | - Olivier Cador
- Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) - UMR 6226, 35000 Rennes, France
| | - Grégory Nocton
- LCM, CNRS, Ecole Polytechnique, Université
Paris-Saclay, Route de Saclay, 91128 Palaiseau, France
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38
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Maity S, Flowers RA. Mechanistic Study and Development of Catalytic Reactions of Sm(II). J Am Chem Soc 2019; 141:3207-3216. [DOI: 10.1021/jacs.8b13119] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Sandeepan Maity
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
| | - Robert A. Flowers
- Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015, United States
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Aretz CD, McPeak JE, Eaton GR, Eaton SS, Cowen BJ. Mechanism of SmI 2 Reduction of 5-Bromo-6-oxo-6-phenylhexyl Methanesulfonate Studied by Spin Trapping with 2-Methyl-2-nitrosopropane. J Org Chem 2018; 83:10688-10692. [PMID: 30102044 DOI: 10.1021/acs.joc.8b01517] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The radical formed by reduction of 5-bromo-6-oxo-6-phenylhexyl methanesulfonate, an α-bromoketone, with SmI2 was spin trapped with 2-methyl-2-nitrosopropane. Electron paramagnetic resonance spectra of the spin adduct and the adduct formed in the analogous reaction with selectively deuterated substrate identify the radical intermediate in this SmI2 reduction as a carbon-centered radical. This result supports the proposal that the formation of reactive Sm-enolates arises from reduction of the carbon-bromine bond rather than a ketyl radical anion.
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Affiliation(s)
- Christopher D Aretz
- Department of Chemistry and Biochemistry , University of Denver , Denver , Colorado 80208 , United States
| | - Joseph E McPeak
- Department of Chemistry and Biochemistry , University of Denver , Denver , Colorado 80208 , United States
| | - Gareth R Eaton
- Department of Chemistry and Biochemistry , University of Denver , Denver , Colorado 80208 , United States
| | - Sandra S Eaton
- Department of Chemistry and Biochemistry , University of Denver , Denver , Colorado 80208 , United States
| | - Bryan J Cowen
- Department of Chemistry and Biochemistry , University of Denver , Denver , Colorado 80208 , United States
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Cheisson T, Ricard L, Heinemann FW, Meyer K, Auffrant A, Nocton G. Synthesis and Reactivity of Low-Valent f-Element Iodide Complexes with Neutral Iminophosphorane Ligands. Inorg Chem 2018; 57:9230-9240. [DOI: 10.1021/acs.inorgchem.8b01259] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Thibault Cheisson
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
| | - Louis Ricard
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
| | - Frank W. Heinemann
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Karsten Meyer
- Department of Chemistry and Pharmacy, Inorganic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg (FAU), Egerlandstraße 1, 91058 Erlangen, Germany
| | - Audrey Auffrant
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
| | - Grégory Nocton
- LCM, Ecole Polytechnique, CNRS, Université Paris-Saclay, F-91128 Palaiseau Cedex, France
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41
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Bienfait AM, Wolf BM, Törnroos KW, Anwander R. Trivalent Rare-Earth-Metal Bis(trimethylsilyl)amide Halide Complexes by Targeted Oxidations. Inorg Chem 2018; 57:5204-5212. [DOI: 10.1021/acs.inorgchem.8b00240] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- André M. Bienfait
- Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway
| | - Benjamin M. Wolf
- Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
| | - Karl W. Törnroos
- Department of Chemistry, University of Bergen, Allégaten 41, N-5007 Bergen, Norway
| | - Reiner Anwander
- Institut für Anorganische Chemie, Universität Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
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42
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Battaglia S, Keller S, Knecht S. Efficient Relativistic Density-Matrix Renormalization Group Implementation in a Matrix-Product Formulation. J Chem Theory Comput 2018; 14:2353-2369. [DOI: 10.1021/acs.jctc.7b01065] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Stefano Battaglia
- ETH Zürich, Laboratorium für Physikalische Chemie, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Sebastian Keller
- ETH Zürich, Laboratorium für Physikalische Chemie, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
| | - Stefan Knecht
- ETH Zürich, Laboratorium für Physikalische Chemie, Vladimir-Prelog-Weg 2, 8093 Zürich, Switzerland
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43
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Reductive coupling of hydantoins with benzophenones by low-valent titanium: Synthesis of 4-substituted 1H-imidazol-2(3H)-ones and unusual two-to-two coupled products. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.01.022] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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44
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Liu Z, Nan X, Lei T, Zhou C, Wang Y, Liu W, Chen B, Tung C, Wu L. Photo-induced reductive cross-coupling of aldehydes, ketones and imines with electron-deficient arenes to construct aryl substituted alcohols and amines. CHINESE JOURNAL OF CATALYSIS 2018. [DOI: 10.1016/s1872-2067(17)62896-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
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45
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Ramirez-Solis A, Amaro-Estrada JI, Hernández-Cobos J, Maron L. Aqueous Solvation of SmI 3: A Born-Oppenheimer Molecular Dynamics Density Functional Theory Cluster Approach. Inorg Chem 2018; 57:2843-2850. [PMID: 29424528 DOI: 10.1021/acs.inorgchem.7b03220] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We report the results of Born-Oppenheimer molecular dynamics (BOMD) simulations on the aqueous solvation of the SmI3 molecule and of the bare Sm3+ cation at room temperature using the cluster microsolvation approach including 37 and 29 water molecules, respectively. The electronic structure calculations were done using the M062X hybrid exchange-correlation functional in conjunction with the 6-31G** basis sets for oxygen and hydrogen. For the iodine and samarium atoms, the Stuttgart-Köln relativistic effective-core potentials were utilized with their associated valence basis sets. When SmI3 is embedded in the microsolvation environment, we find that substitution of the iodine ions by water molecules around Sm(III) cannot be achieved due to an insufficient number of explicit water molecules to fully solvate the four separate metal and halogen ions. Therefore, we studied the solvation dynamics of the bare Sm3+ cation with a 29-water molecule model cluster. Through the Sm-O radial distribution function and the evolution of the Sm-O distances, the present study yields a very tightly bound first rigid Sm(III) solvation shell from 2.3 to 2.9 Å whose integration leads to a coordination number of 9 water molecules and a second softer solvation sphere from 3.9 to 5 Å with 12 water molecules. No water exchange processes were found. The theoretical EXAFS spectrum is in excellent agreement with the experimental spectrum for Sm(III) in liquid water. The strong differences between the solvation patterns of Sm(III) vs Sm(II) are discussed in detail.
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Affiliation(s)
- Alejandro Ramirez-Solis
- Depto. de Física, Centro de Investigación en Ciencias-IICBA , Universidad Autónoma del Estado de Morelos , Cuernavaca , Morelos 62209 , México
| | | | | | - Laurent Maron
- Laboratoire de Physique et Chimie de Nano-objets , Université de Toulouse INSA-CNRS-UPS , 135, Avenue de Rangueil , 31077 Toulouse , France
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46
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Xu X, Min QQ, Li N, Liu F. Visible light-promoted umpolung coupling of aryl tri-/difluoroethanones with 2-alkenylpyridines. Chem Commun (Camb) 2018; 54:11017-11020. [DOI: 10.1039/c8cc06748a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
A metal-free, mild, and simple protocol is developed for the synthesis of tertiary alcohols bearing tri-/difluoromethyl groups upon visible-light irradiation.
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Affiliation(s)
- Xiao Xu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry
- College of Pharmaceutical Sciences
- Soochow University
- Suzhou
- People's Republic of China
| | - Qing-Qiang Min
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry
- College of Pharmaceutical Sciences
- Soochow University
- Suzhou
- People's Republic of China
| | - Na Li
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry
- College of Pharmaceutical Sciences
- Soochow University
- Suzhou
- People's Republic of China
| | - Feng Liu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry
- College of Pharmaceutical Sciences
- Soochow University
- Suzhou
- People's Republic of China
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47
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Xémard M, Cordier M, Louyriac E, Maron L, Clavaguéra C, Nocton G. Small molecule activation with divalent samarium triflate: a synergistic effort to cleave O2. Dalton Trans 2018; 47:9226-9230. [DOI: 10.1039/c8dt02196a] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The reaction of divalent samarium triflate with O2 leads to the entire reductive cleavage of O2, highlighting a synergistic effort since four electrons, and therefore four samarium centers, are necessary.
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Affiliation(s)
- Mathieu Xémard
- LCM
- CNRS
- Ecole polytechnique
- Route de Saclay
- 91128 Palaiseau Cedex
| | - Marie Cordier
- LCM
- CNRS
- Ecole polytechnique
- Route de Saclay
- 91128 Palaiseau Cedex
| | | | | | - Carine Clavaguéra
- Laboratoire de Chimie Physique
- CNRS-Université Paris-Sud
- Université Paris-Saclay
- 91405 Orsay Cedex
- France
| | - Grégory Nocton
- LCM
- CNRS
- Ecole polytechnique
- Route de Saclay
- 91128 Palaiseau Cedex
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48
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Facile synthesis of sweet corn like Sm2O3 and their catalytic performance for 2-azidoalcohol synthesis. Colloids Surf A Physicochem Eng Asp 2017. [DOI: 10.1016/j.colsurfa.2017.09.033] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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49
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Synthesis of Nitrogen Heterocycles Using Samarium(II) Iodide. Molecules 2017; 22:molecules22112018. [PMID: 29160806 PMCID: PMC6150357 DOI: 10.3390/molecules22112018] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 11/11/2017] [Accepted: 11/13/2017] [Indexed: 11/19/2022] Open
Abstract
Nitrogen heterocycles represent vital structural motifs in biologically-active natural products and pharmaceuticals. As a result, the development of new, convenient and more efficient processes to N-heterocycles is of great interest to synthetic chemists. Samarium(II) iodide (SmI2, Kagan’s reagent) has been widely used to forge challenging C–C bonds through reductive coupling reactions. Historically, the use of SmI2 in organic synthesis has been focused on the construction of carbocycles and oxygen-containing motifs. Recently, significant advances have taken place in the use of SmI2 for the synthesis of nitrogen heterocycles, enabled in large part by the unique combination of high reducing power of this reagent (E1/2 of up to −2.8 V) with excellent chemoselectivity of the reductive umpolung cyclizations mediated by SmI2. In particular, radical cross-coupling reactions exploiting SmI2-induced selective generation of aminoketyl radicals have emerged as concise and efficient methods for constructing 2-azabicycles, pyrrolidines and complex polycyclic barbiturates. Moreover, a broad range of novel processes involving SmI2-promoted formation of aminyl radicals have been leveraged for the synthesis of complex nitrogen-containing molecular architectures by direct and tethered pathways. Applications to the synthesis of natural products have highlighted the generality of processes and the intermediates accessible with SmI2. In this review, recent advances involving the synthesis of nitrogen heterocycles using SmI2 are summarized, with a major focus on reductive coupling reactions that enable one-step construction of nitrogen-containing motifs in a highly efficient manner, while taking advantage of the spectacular selectivity of the venerable Kagan’s reagent.
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50
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Huang HM, Procter DJ. Radical Heterocyclization and Heterocyclization Cascades Triggered by Electron Transfer to Amide-Type Carbonyl Compounds. Angew Chem Int Ed Engl 2017; 56:14262-14266. [DOI: 10.1002/anie.201708354] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Huan-Ming Huang
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
| | - David J. Procter
- School of Chemistry; University of Manchester; Manchester M13 9PL UK
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