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Bührmann L, Albers L, Beuße M, Schmidtmann M, Müller T. Aluminagerma[5]pyramidanes-Formation and Skeletal Rearrangement. Angew Chem Int Ed Engl 2024; 63:e202401467. [PMID: 38470087 DOI: 10.1002/anie.202401467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2024] [Revised: 02/18/2024] [Accepted: 02/29/2024] [Indexed: 03/13/2024]
Abstract
The salt metathesis reaction of dipotassium germacyclopentadienediide with aluminum(III) dichlorides provides either half-sandwich alumole complexes of germanium(II) or aluminylene germole complexes. Their molecular structure and the delocalized bonding situation, revealed by density functional theory (DFT) calculations, are equally described as isomeric aluminagerma[5]pyramidanes with either the germanium or the aluminum atom in the apical position of the pentagonal pyramid. The product formation and the selectivity of the reaction depends on the third substituent of the aluminum dichloride. Aryl-substituents favor the formation of alumole complexes and Cp*-substituents that of the isomeric germole complexes. With amino-substituents at the aluminum atom mixtures of both isomers are formed and the positional exchange of the two heteroatoms is shown by NMR spectroscopy. The alumole complexes of germanium(II) undergo facile reductive elimination of germanium and form the corresponding alumoles.
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Affiliation(s)
- Lukas Bührmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, D. 26129, Oldenburg, Federal Republic of Germany, EU
| | - Lena Albers
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, D. 26129, Oldenburg, Federal Republic of Germany, EU
| | - Maximilian Beuße
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, D. 26129, Oldenburg, Federal Republic of Germany, EU
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, D. 26129, Oldenburg, Federal Republic of Germany, EU
| | - Thomas Müller
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, D. 26129, Oldenburg, Federal Republic of Germany, EU
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2
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Das S, Buschermöhle J, Zant DW, Schmidtmann M, van der Vlugt JI. Selective Manipulation of Well-Defined Trinuclear Pd(II)-Complexes. Chemistry 2024; 30:e202400044. [PMID: 38334955 DOI: 10.1002/chem.202400044] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/12/2024] [Revised: 02/09/2024] [Accepted: 02/09/2024] [Indexed: 02/10/2024]
Abstract
Several strategies are available to design well-defined multimetallic molecular entities bearing functional ligands. Substoichiometric exchange reactions in the coordination sphere of pre-existing multinuclear precursors are relatively underexploited in this context. Palladium(II) acetate is not a mononuclear compound in the solid state but rather exists as a trimer, i. e. [Pd3(OAc)6]. Although this material is ubiquitously used to synthesize mononuclear Pd species, it may principally also lend itself to selective exchange of some of the edge-sharing acetate units in its triangular motif, whilst keeping the overall multinuclear architecture intact. Strikingly, little is known about the controlled manipulation and substoichiometric substitution chemistry of this well-defined conglomerate. We herein conclusively demonstrate that, for the first time, the targeted exchange of two or four acetate units from the Pd3(acetate)6 platform is possible, thereby installing either one or two new tridentate ligands onto this trinuclear architecture. Follow-up exchange and substitution chemistry is available without disrupting the multimetallic nature of the core structure. New complexes 2-7 are all conclusively characterized using multinuclear NMR spectroscopy, UV-vis and IR spectroscopy as well as X-ray diffraction analysis.
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Affiliation(s)
- Siuli Das
- Bioinspired Coordination Chemistry and Homogeneous Catalysis Group, Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
| | - Julia Buschermöhle
- Bioinspired Coordination Chemistry and Homogeneous Catalysis Group, Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
| | - Dirk W Zant
- van 't Hoff Institute for Molecular Sciences, University of Amsterdam, the, Netherlands
| | - M Schmidtmann
- Bioinspired Coordination Chemistry and Homogeneous Catalysis Group, Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
| | - Jarl Ivar van der Vlugt
- Bioinspired Coordination Chemistry and Homogeneous Catalysis Group, Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
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Geibel N, Bührmann L, Albers L, Schmidtmann M, Weiz A, Müller T. Germaaluminocenes - Masked Heterofulvenes. Angew Chem Int Ed Engl 2024:e202403652. [PMID: 38578658 DOI: 10.1002/anie.202403652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 03/20/2024] [Accepted: 03/21/2024] [Indexed: 04/06/2024]
Abstract
Germaaluminocenes are formed by salt metathesis reactions of dipotassium germacyclopentadienediides with cyclopentadienylaluminum dichloride. The reactivity pattern of these sandwich complexes is determined by the electrophilic central aluminum atom and by the nucleophilic dicoordinated germanium center. Surprisingly, the products formed by reactions with Lewis acids, Lewis bases, amphiphiles and compounds with polar double bonds are those expected from the reaction of a hypothetical aluminagermapentafulvene with these types of reagents. This suggests that germaaluminocenes are synthetic equivalents to these pentafulvenes.
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Affiliation(s)
- Nadeschda Geibel
- Carl von Ossietzky Universitat Oldenburg, Institute of Chemistry, GERMANY
| | - Lukas Bührmann
- Carl von Ossietzky Universitat Oldenburg, Institut of Chemistry, GERMANY
| | - Lena Albers
- Carl von Ossietzky Universitat Oldenburg, Institute of Chemistry, GERMANY
| | - Marc Schmidtmann
- Carl von Ossietzky Universitat Oldenburg, Insitute of Chemistry, GERMANY
| | - Alexander Weiz
- Carl von Ossietzky Universitat Oldenburg, Institute of Chemistry, GERMANY
| | - Thomas Müller
- Carl von Ossietzky-Universität Oldenburg, Institut für Reine und Angewandte Chemie, Carl-von-Ossietzky-Str. 9-11, 26129, Oldenburg, GERMANY
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Schwitalla K, Sad F, Schmidtmann M, Beckhaus R. Syntheses, Characterization, and Multifaceted Coordination Chemistry of Hydrazonido Titanium Complexes. Inorg Chem 2024; 63:3165-3172. [PMID: 38279920 PMCID: PMC10865377 DOI: 10.1021/acs.inorgchem.3c04301] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2023] [Revised: 01/11/2024] [Accepted: 01/18/2024] [Indexed: 01/29/2024]
Abstract
The reaction of hydrazones with bis(π-η5:σ-η1-pentafulvene)titanium complexes leads to both hydrazonido and hydrazido complexes depending on the interaction of the hydrazone with the fulvene ligand of the metal complex. The molecular structures mostly reveal κ2N,N side-on coordination of the hydrazonido ligand due to the deprotonation of the N-H bond by one of the fulvene moieties. Instead of deprotonation, the reaction of the bis(adamantylidene fulvene)titanium complexes with cinnamon aldehyde phenylhydrazone leads to κ1N coordination. By using donating groups in the backbone of the hydrazone ligands, there are exceptions to this coordination mode due to the insertion of the C═N double bond into the Ti-Cexo bond of the pentafulvene moiety. Using 2-pyridinecarboxaldehyde phenylhydrazone, a formal κ3N,N,N ligand system is formed by the coordination of the pyridine nitrogen atom to the metal center via consecutive N-H deprotonation and insertion. Finally, the use of salicylaldehyde phenylhydrazone ultimately produces a complex with the κ3N,N,O coordination mode by double deprotonation of the hydrazone N-H and O-H functions. Because of its slow conversion to the final product, the intermediate was isolated as an insertion product with consecutive O-H deprotonation, showing a κ2N,O coordination mode of the hydrazido ligand.
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Affiliation(s)
- Kevin Schwitalla
- Institut Für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Fares Sad
- Institut Für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Marc Schmidtmann
- Institut Für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Rüdiger Beckhaus
- Institut Für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
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Beims N, Greven T, Schmidtmann M, van der Vlugt JI. Geometrically Deformed and Conformationally Rigid Phosphorus Trisamides Featuring an Unsymmetrical Backbone. Chemistry 2023; 29:e202302463. [PMID: 37873907 DOI: 10.1002/chem.202302463] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Accepted: 09/13/2023] [Indexed: 10/25/2023]
Abstract
Nonclassical P(III) centers have attracted much attention in recent years. Incorporating a P(III) center in a rigid bicyclic platform offers a particularly attractive way to invoke significant geometric distortion of the phosphorus atom that may in turn induce unusual reactivity. Although still relatively scarcely explored, phosphorus centers enforced in a non-C3 symmetry have gained significant traction lately. However, the current scaffolds are based on a relatively limited set of design principles and ligand platforms associated therewith. This work is focussed on the synthesis as well as versatile oxidation, addition and coordination chemistry of a geometrically distorted P(III) species featuring a synthetically modular, nonsymmetric trisamine platform derived from 2-(methylamino)-N-(2-(methylamino)phenyl)benzenesulfonamide.
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Affiliation(s)
- Niklas Beims
- Bioinspired Coordination Chemistry and Homogeneous Catalysis Group, Institute of Chemistry, School of Mathematics and Sciences, Carl von Ossietzky University Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
| | - Tobias Greven
- Bioinspired Coordination Chemistry and Homogeneous Catalysis Group, Institute of Chemistry, School of Mathematics and Sciences, Carl von Ossietzky University Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
| | - Marc Schmidtmann
- Bioinspired Coordination Chemistry and Homogeneous Catalysis Group, Institute of Chemistry, School of Mathematics and Sciences, Carl von Ossietzky University Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
| | - Jarl Ivar van der Vlugt
- Bioinspired Coordination Chemistry and Homogeneous Catalysis Group, Institute of Chemistry, School of Mathematics and Sciences, Carl von Ossietzky University Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
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Thoben N, Kaper T, de Graaff S, Gerhards L, Schmidtmann M, Klüner T, Beckhaus R, Doye S. Density Functional Theory Calculations for Multiple Conformers Explaining the Regio- and Stereoselectivity of Ti-Catalyzed Hydroaminoalkylation Reactions. Chemphyschem 2023; 24:e202300370. [PMID: 37326019 DOI: 10.1002/cphc.202300370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 06/16/2023] [Accepted: 06/16/2023] [Indexed: 06/17/2023]
Abstract
Hybrid Density Functional Theory (DFT) calculations for multiple conformers of the insertion reactions of a methylenecyclopropane into the Ti-C bond of two differently α-substituted titanaaziridines explain the experimentally observed differences in regioselectivity between catalytic hydroaminoalkylation reactions of methylenecyclopropanes with α-phenyl-substituted secondary amines and corresponding stoichiometric reactions of a methylenecyclopropane with titanaaziridines, which can only be achieved with α-unsubstituted titanaaziridines. In addition, the lack of reactivity of α-phenyl-substituted titanaaziridines as well as the diastereoselectivity of the catalytic and stoichiometric reactions can be understood.
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Affiliation(s)
- Niklas Thoben
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Tobias Kaper
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Simon de Graaff
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Luca Gerhards
- Institut für Physik, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Marc Schmidtmann
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Thorsten Klüner
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Rüdiger Beckhaus
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Sven Doye
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
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7
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Tandekar K, Schmidtmann M, Tripathi A, Mishra NK, Supriya S. Light-induced dissolution and concomitant crystallization of a Keggin-type polyoxometalate mimicking a naturally occurring phenomenon. Chem Commun (Camb) 2023; 59:3241-3244. [PMID: 36815372 DOI: 10.1039/d2cc03273b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
A suspension of a yellow polycrystalline compound [PPh4]3[PMoVI12O40] in N-methylformanilide (NMF) (in which it is not soluble), on irradiation with sunlight, initiates dissolution via its reduction followed by its crystallization leading to the isolation of single crystals of compound [PPh4]4[PMoVMoVI11O40]·3CH3(C6H5)NCHO (1). Compounds [PPh4]3[PMoVI12O40]·1.75 CH3(C6H5)NCHO (2) and [PPh4]3[PMoVI12O40]·2CH3(C6H5)NCHO (3), each containing an oxidized Keggin anion, are obtained at two different temperatures when the corresponding mother liquor is kept in the dark.
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Affiliation(s)
- Kesar Tandekar
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
| | - Marc Schmidtmann
- Institute of Chemistry, University of Oldenburg, Carl-von-Ossietzky-Str. 9-11, 26129 Oldenburg, Germany
| | - Anjali Tripathi
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
| | - Neeraj Kumar Mishra
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
| | - Sabbani Supriya
- School of Physical Sciences, Jawaharlal Nehru University, New Delhi-110067, India.
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8
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de Graaff S, Schmidtmann M, Beckhaus R. Elemental Magnesium as an Early Transition Metal Substitute: From Pentafulvene Coordination to Deprotonation of Amines. Chemistry 2023; 29:e202300221. [PMID: 36897013 DOI: 10.1002/chem.202300221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2023] [Revised: 03/10/2023] [Accepted: 03/10/2023] [Indexed: 03/11/2023]
Abstract
The reaction of magnesium turnings and 6,6-di-para-tolylpentafulvene was investigated. Under mild conditions, the magnesium dissolves, forming the MgII complex 1 with a π-η5:σ-κ1 coordinating ligand of the dimerized pentafulvene, analyzed by NMR and XRD investigations. As a magnesium pentafulvene complex was a possible intermediate, amines were employed as intercepting agents. Thereby, the amines were formally deprotonated by elemental magnesium, yielding the first examples of Cp'Mg(THF)2NR2 complexes. This reaction competes with the formation of 1 and a consecutive formal [1,5]-H-shift forming an ansa-magnesocene. Employing amines with low basicity gave quantitative conversion to the amide complexes.
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Affiliation(s)
- Simon de Graaff
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Institut für Chemie, GERMANY
| | - Marc Schmidtmann
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Institut für Chemie, GERMANY
| | - Ruediger Beckhaus
- University of Oldenburg, Chemistry, Carl-von-Ossietzky Strasse, D-26111, Oldenburg, GERMANY
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de Graaff S, Schwitalla K, Thye H, Yusufzadeh Z, Willms M, Schmidtmann M, Beckhaus R. Vanadium Pentafulvene Complexes: Synthon for Unprecedented VanadoceneIII Derivatives. Chemistry 2023; 29:e202203846. [PMID: 36892568 DOI: 10.1002/chem.202203846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2022] [Revised: 03/02/2023] [Accepted: 03/03/2023] [Indexed: 03/10/2023]
Abstract
The benzene ligand at CpV(η6-C6H6) (1) is exchanged for pentafulvenes. Using sterically demanding pentafulvenes gives a clean exchange reaction, yielding vanadium pentafulvene (2a and 2b) and benzofulvene complexes (3a and 3b). The molecular structures of the target compounds suggest a π-η5:σ-η1 coordination mode with a vanadiumIII center. With the sterically low demanding 6,6-dimethylpentafulvene, a C-H activation at the leaving ligand is observed, yielding the ring-substituted vanadoceneII4. The reactivity of the pentafulvene complexes was investigated. A series of unprecedented vanadoceneIII compounds were synthesized: Under mild conditions, E-H splitting of 4-tert-butylphenol, diphenylamine, and 2,6-diisopropylaniline yield well characterized examples of rare vanadoceneIII phenolate and amide complexes. Insertion reactions into the V-Cexo bond of the pentafulvene complexes by multiple bond containing substrates were found for acetone, 4-chlorobenzonitril and N,N'-dicyclohexylcarbodiimide.
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Affiliation(s)
- Simon de Graaff
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Chemistry, GERMANY
| | - Kevin Schwitalla
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Chemistry, GERMANY
| | - Hermann Thye
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Chemistry, GERMANY
| | - Zainab Yusufzadeh
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Chemistry, GERMANY
| | - Michael Willms
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Chemistry, GERMANY
| | - Marc Schmidtmann
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Chemistry, GERMANY
| | - Ruediger Beckhaus
- University of Oldenburg, Chemistry, Carl-von-Ossietzky Strasse, D-26111, Oldenburg, GERMANY
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Aeissen E, von Seggern AR, Schmidtmann M, Christoffers J. Enantioselective Synthesis of [b]‐Annulated Azepane Scaffolds. European J Org Chem 2023. [DOI: 10.1002/ejoc.202300180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Affiliation(s)
- Enno Aeissen
- Carl von Ossietzky Universität Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Aaron R. von Seggern
- Carl von Ossietzky Universität Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Marc Schmidtmann
- Carl von Ossietzky Universität Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Jens Christoffers
- Carl von Ossietzky Universitat Oldenburg Institut für Chemie Carl von Ossietzky-Str. 9-11 26129 Oldenburg GERMANY
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Eilers M, Schwitalla K, Dirksen T, Schmidtmann M, Fischer M, Beckhaus R. The Parent Allene H 2C═C═CH 2 as an Allyl Ligand Precursor in Reactions with Bis(pentafulvene)titanium Complexes. Organometallics 2023. [DOI: 10.1021/acs.organomet.2c00581] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Marcel Eilers
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Germany
| | - Kevin Schwitalla
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Germany
| | - Tobias Dirksen
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Germany
| | - Marc Schmidtmann
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Germany
| | - Malte Fischer
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße 7, D-28359 Bremen, Germany
| | - Rüdiger Beckhaus
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Germany
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12
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Schwitalla K, Lee W, Fischer M, Schmidtmann M, Beckhaus R. Synthesis and Characterization of Zr and Hf Triazenido Complexes with Rare κ 1N-Coordination Built Directly in the Coordination Sphere of the Metal. Organometallics 2023. [DOI: 10.1021/acs.organomet.2c00588] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Kevin Schwitalla
- MSc. K. Schwitalla, Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Wing Lee
- BSc. Wing Lee, Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Malte Fischer
- Dr. Malte. Fischer Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße 7, D-28359 Bremen, Germany
| | - Marc Schmidtmann
- Dr. M. Schmidtmann, Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Rüdiger Beckhaus
- Prof. Dr. R. Beckhaus, Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
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Müller C, Schu J, Morgenstern B, Zimmer M, Schmidtmann M, Schäfer A. Phosphanyl-substituted tin half-sandwich complexes †. RSC Adv 2023; 13:10249-10253. [PMID: 37006362 PMCID: PMC10065063 DOI: 10.1039/d3ra01384g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2023] [Accepted: 03/22/2023] [Indexed: 04/03/2023] Open
Abstract
Phosphanyl-substituted tin(ii) half sandwich complexes are reported. Due to the Lewis acidic tin center and Lewis basic phosphorous atom they form head-to-tail dimers. Their properties and reactivities were investigated both experimentally and theoretically. Furthermore, related transition metal complexes of these species are presented. Phosphanyl-substituted tin(ii) half sandwich complexes are reported, which exhibit Lewis acidic tin atoms and Lewis basic phosphorous atoms and form head-to-tail dimers.![]()
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Affiliation(s)
- Carsten Müller
- Faculty of Natural Sciences and Technology, Department of Chemistry, Saarland University66123 SaarbrückenGermany
| | - Justin Schu
- Faculty of Natural Sciences and Technology, Department of Chemistry, Saarland University66123 SaarbrückenGermany
| | - Bernd Morgenstern
- Faculty of Natural Sciences and Technology, Department of Chemistry, Saarland University66123 SaarbrückenGermany
| | - Michael Zimmer
- Faculty of Natural Sciences and Technology, Department of Chemistry, Saarland University66123 SaarbrückenGermany
| | - Marc Schmidtmann
- School of Mathematics and Science, Institute of Chemistry, Carl von Ossietzky University of Oldenburg26129 OldenburgGermany
| | - André Schäfer
- Faculty of Natural Sciences and Technology, Department of Chemistry, Saarland University66123 SaarbrückenGermany
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de Graaff S, Elma A, Schmidtmann M, Beckhaus R. (Carbazol-9-ido-κ N)di-chlorido-(η 5:η 1-2,3,4,5-tetra-methyl-penta-fulvene)tantalum(V). IUCrdata 2022; 7:x221201. [PMID: 36628193 PMCID: PMC9815124 DOI: 10.1107/s2414314622012019] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 12/20/2022] [Indexed: 12/25/2022] Open
Abstract
The reaction of (η5:η1-2,3,4,5-tetra-methyl-penta-fulvene)tantalum(V) dicarbazolide chloride (1) with etheric HCl results in the formation of the title compound (2), [Ta(C10H14)(C12H8N)Cl2]. The TaV atom has a distorted tetra-hedral coordination environment in a three-legged piano-stool fashion. The conformation of the penta-fulvene exocyclic C atom to the three other ligands is staggered and not eclipsed, as found in the crystal structure of 1. Inter-molecular inter-actions include π-π stacking, H⋯π inter-actions and weak C-H⋯Cl hydrogen bonds.
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Affiliation(s)
- Simon de Graaff
- Carl von Ossietzky Universität Oldenburg, Fakultät V - Mathematik und Naturwissenschaften, Institut für Chemie, Carl-von-Ossietzky-Strasse 9-11, D-26111 Oldenburg, Germany
| | - Aylişa Elma
- Carl von Ossietzky Universität Oldenburg, Fakultät V - Mathematik und Naturwissenschaften, Institut für Chemie, Carl-von-Ossietzky-Strasse 9-11, D-26111 Oldenburg, Germany
| | - Marc Schmidtmann
- Carl von Ossietzky Universität Oldenburg, Fakultät V - Mathematik und Naturwissenschaften, Institut für Chemie, Carl-von-Ossietzky-Strasse 9-11, D-26111 Oldenburg, Germany
| | - Rüdiger Beckhaus
- Carl von Ossietzky Universität Oldenburg, Fakultät V - Mathematik und Naturwissenschaften, Institut für Chemie, Carl-von-Ossietzky-Strasse 9-11, D-26111 Oldenburg, Germany,Correspondence e-mail:
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Speldrich JM, Schmidtmann M, Christoffers J. Synthetic Studies Towards Pheromones by Cyanide‐Catalyzed Ring‐Transformation of α‐Hydroxy‐β‐oxoesters to δ‐Valerolactones. European J Org Chem 2022. [DOI: 10.1002/ejoc.202201391] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Jean-Marico Speldrich
- Carl von Ossietzky Universität Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Marc Schmidtmann
- Carl von Ossietzky Universität Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Jens Christoffers
- Carl von Ossietzky Universitat Oldenburg Institut für Chemie Carl von Ossietzky-Str. 9-11 26129 Oldenburg GERMANY
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16
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Schröder N, Schmidtmann M, Mouritsen H, Christoffers J. Synthesis of Flavin‐Indole‐Conjugates with Rigid Diamino Linkers as Cryptochrome Model Compounds. European J Org Chem 2022. [DOI: 10.1002/ejoc.202201327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Nils Schröder
- Carl von Ossietzky Universität Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Marc Schmidtmann
- Carl von Ossietzky Universität Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Henrik Mouritsen
- Carl von Ossietzky Universität Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Biologie und Umweltwissenschaften GERMANY
| | - Jens Christoffers
- Carl von Ossietzky Universitat Oldenburg Institut für Chemie Carl von Ossietzky-Str. 9-11 26129 Oldenburg GERMANY
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17
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de Graaff S, Eilers M, Buschermöhle J, Bengen N, Dierks A, Schmidtmann M, Manßen M, Beckhaus R. Niobium Bis‐ and Mono(Pentafulvene) Complexes: E–H Bond Cleavage and Insertion Reactions (E = C, N, O). Eur J Inorg Chem 2022. [DOI: 10.1002/ejic.202200637] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Simon de Graaff
- Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Chemistry GERMANY
| | - Marcel Eilers
- Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Chemistry GERMANY
| | - Julia Buschermöhle
- Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Chemistry GERMANY
| | - Nina Bengen
- Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Chemistry GERMANY
| | - Anna Dierks
- Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Chemistry GERMANY
| | - Marc Schmidtmann
- Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Chemistry GERMANY
| | - Manfred Manßen
- Eberhard Karls Universität Tübingen: Eberhard Karls Universitat Tubingen Chemistry GERMANY
| | - Ruediger Beckhaus
- University of Oldenburg Chemistry Carl-von-Ossietzky Strasse D-26111 Oldenburg GERMANY
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18
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Kaper T, Elma A, Thye H, Knupe‐Wolfgang P, Zimmering R, Schmidtmann M, Doye S. Titanium‐Catalyzed Intermolecular Hydroaminoalkylation of Allenes and Methylenecyclopropanes. European J Org Chem 2022. [DOI: 10.1002/ejoc.202201365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Tobias Kaper
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Aylişa Elma
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Hermann Thye
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Paula Knupe‐Wolfgang
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - René Zimmering
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Sven Doye
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
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19
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Fitschen K, Frerichs N, Yusufzadeh Z, Schmidtmann M, Beckhaus R. Crystal structures of the Lewis acid–base adducts {[(C 6H 11) 2N] 3Ti– LB} +[MeB(C 6F 5) 3] −·1.5C 7H 8; LB = (C 6H 5) 3PO (1), p-F—C 6H 4CN (2). Acta Crystallogr E Crystallogr Commun 2022; 78:912-915. [PMID: 36072512 PMCID: PMC9443798 DOI: 10.1107/s2056989022007952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 08/08/2022] [Indexed: 11/23/2022]
Abstract
In the molecular structures of the two title compounds, the central titanium(IV) atoms are coordinated in a distorted tetrahedral fashion. Thereby, the titanium atom is stabilized by the Lewis bases triphenylphosphine oxide (1) and p-fluorobenzonitrile (pFBN) (2) with dative O—Ti and N—Ti bonds, respectively. The reaction of [(C6H11)2N]3Ti—CH3 with the Lewis acid B(C6F5)3, followed by addition of the Lewis bases (C6H5)3PO and p-F—C6H4CN led to the complex salts tris(dicyclohexylamido)(triphenylphosphine oxide)titanium methyltris(pentafluorophenyl)borate toluene sesquisolvate, [Ti(C12H22N)3(C18H15OP)](C19H3F15B)·1.5C7H8, (1), and tris(dicyclohexylamido)(4-fluorobenzonitrile)titanium methyltris(pentafluorophenyl)borate toluene sesquisolvate, [Ti(C12H22N)3(C7H4FN)](C19H3F15B)·1.5C7H8, (2), both crystallizing with 1.5 equivalents of toluene solvent molecules. The Lewis acid–base adducts (1) and (2) can be described by dative donor bonds. The packing of the complex cations, anions and solvent molecules in the crystal structure is consolidated by an intricate three-dimensional network of non-classical C—H⋯F interactions. Disorder of some of the cyclohexyl groups and the toluene solvent molecules is observed.
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Kaper T, Elma A, Thye H, Knupe-Wolfgang P, Zimmering R, Schmidtmann M, Doye S. Titanium‐Catalyzed Intermolecular Hydroaminoalkylation of Allenes and Methylenecyclopropanes. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tobias Kaper
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Aylişa Elma
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Hermann Thye
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Paula Knupe-Wolfgang
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - René Zimmering
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Marc Schmidtmann
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg Institut für Chemie GERMANY
| | - Sven Doye
- Universitaet Oldenburg Institut fuer Chemie Carl-von-Ossietzky-Strasse 9-11 26129 Oldenburg GERMANY
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21
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Wohltmann WM, Schmidtmann M, Müller T. Covalent triflates as synthons for silolyl- and germolyl cations. Dalton Trans 2022; 51:9836-9842. [PMID: 35708108 DOI: 10.1039/d2dt01446g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis of 1-silolyl and 1-germolyl triflates from the corresponding chlorides by salt metathesis reaction is reported. These covalent triflates are ideal starting materials for the preparation of ionic silolyl- and germolyl-imidazolium triflates by their reaction with N-heterocyclic carbenes. Similarily, ionic silolyl- and germolyl-oxophosphonium triflates are obtained by substitution of the triflate group by triethylphosphane oxide Et3PO. The analysis of their 31P NMR chemical shifts according to the Gutmann-Beckett method reveal the high Lewis acidity of the underlying silolyl and germolyl cations. Further analysis of structural and NMR parameters of the silolyl- and germolyl-imidazolium and oxophosphonium triflates indicates that these compounds are covalently bonded silole and germole derivatives with insignificant contributions from silolyl- or germolyl cations. Silolyl and germolyl triflates are however synthetic equivalents of these cations and might serve as a source for electrophilic silolyl and germolyl units.
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Affiliation(s)
- Wiebke Marie Wohltmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129 Oldenburg, Germany.
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129 Oldenburg, Germany.
| | - Thomas Müller
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129 Oldenburg, Germany.
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22
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Fischer M, Roy MMD, Hüller S, Schmidtmann M, Beckhaus R. Reaction of a bis(pentafulvene)titanium complex with an N-heterocyclic olefin: C-H-activation leads to resonance between a titanium vinyl and titanium alkylidene complex. Dalton Trans 2022; 51:10690-10696. [PMID: 35166757 DOI: 10.1039/d2dt00014h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The N-heterocyclic olefin (NHO) ImMe4CH2 (2) (ImMe4CH2 = (MeCNMe)2CCH2) was employed for the synthesis of the titanium complex 3 derived from an NHO ligand precursor. By reacting 2 with the bis(π-η5:σ-η1-pentafulvene)titanium complex 1a, the terminal ylidic methylene unit of 2 is deprotonated by the quaternary exocyclic carbon atom of one pentafulvene ligand of 1a yielding the titanium complex 3 which bears an anionic NHO ligand (ImMe4CH-). 3 was characterized by NMR spectroscopy, single crystal X-ray diffraction and quantum chemical calculations. The latter highlight that 3 is best described as a titanium vinyl complex with significant contribution of the titanium alkylidene resonance structure.
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Affiliation(s)
- Malte Fischer
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford, OX1 3QR, UK. .,Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg, Postfach 2503, D-26111 Oldenburg, Germany.
| | - Matthew M D Roy
- Department of Chemistry, Catalysis Research Center and Institute for Silicon Chemistry, Technische Universität München, Germany
| | - Sascha Hüller
- Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg, Postfach 2503, D-26111 Oldenburg, Germany.
| | - Marc Schmidtmann
- Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg, Postfach 2503, D-26111 Oldenburg, Germany.
| | - Rüdiger Beckhaus
- Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg, Postfach 2503, D-26111 Oldenburg, Germany.
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23
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Cramer HH, Bührmann L, Schmidtmann M, Müller T. A phenyl-substituted germole dianion and its reaction with hafnocene dichloride. Mendeleev Communications 2022. [DOI: 10.1016/j.mencom.2022.01.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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de Graaff S, Schwitalla K, Haaker CV, Bengen N, Schmidtmann M, Beckhaus R. A Niobium Pentafulvene Ethylene Complex: Synthesis, Properties and Reaction Pathways. Dalton Trans 2022; 51:12502-12511. [DOI: 10.1039/d2dt02063g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The π-η5:σ-η1 coordination mode of early transition metal pentafulvene ligands yields a strongly nucleophilic exocyclic carbon atom (Cexo). The substitution of the chlorido ligand of bis(η5:η1-(di-p-tolyl)pentafulvene)niobium chloride (1) by reaction...
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Kaper T, Geik D, Fornfeist F, Schmidtmann M, Doye S. Stereoselective Synthesis of Tertiary Allylic Amines by Titanium-Catalyzed Hydroaminoalkylation of Alkynes with Tertiary Amines. Chemistry 2021; 28:e202103931. [PMID: 34936144 PMCID: PMC9303398 DOI: 10.1002/chem.202103931] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2021] [Indexed: 12/01/2022]
Abstract
Intermolecular hydroaminoalkylation reactions of symmetrical and unsymmetrical alkynes with tertiary amines take place in the presence of catalytic amounts of TiBn4, Ph3C[B(C6F5)4], and a sterically demanding aminopyridinato ligand precursor. The resulting products, synthetically and pharmaceutically useful tertiary β,γ‐disubstituted allylic amines, are formed in convincing yields and with excellent stereoselectivity. Particularly promising for future applications is the fact that even the industrial side product trimethylamine can be used as a substrate.
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Affiliation(s)
- Tobias Kaper
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Institut für Chemie, GERMANY
| | - Dennis Geik
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Institut für Chemie, GERMANY
| | - Felix Fornfeist
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Institut für Chemie, GERMANY
| | - Marc Schmidtmann
- Carl-von-Ossietzky-Universitat Oldenburg: Carl von Ossietzky Universitat Oldenburg, Institut für Chemie, GERMANY
| | - Sven Doye
- Universitaet Oldenburg, Institut fuer Chemie, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, GERMANY
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Balzer F, Schumacher MF, Mattiello S, Schulz M, Zablocki J, Schmidtmann M, Meerholz K, Serdar Sariciftci N, Beverina L, Lützen A, Schiek M. The Impact of Chiral Citronellyl‐Functionalization on Indolenine and Anilino Squaraine Thin Films. Isr J Chem 2021. [DOI: 10.1002/ijch.202100079] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Frank Balzer
- SDU Centre for Photonics Engineering Mads Clausen Institute University of Southern Denmark Alsion 2 DK-6400 Sønderborg Denmark
| | - Marvin F. Schumacher
- Kekulé-Institute for Organic Chemistry and Biochemistry University of Bonn Gerhard-Domagk-Str. 1 D-53121 Bonn Germany
| | - Sara Mattiello
- Department of Materials Chemistry and INSTM University of Milano-Bicocca Via R. Cozzi 53 I-20125 Milano Italy
| | - Matthias Schulz
- Kekulé-Institute for Organic Chemistry and Biochemistry University of Bonn Gerhard-Domagk-Str. 1 D-53121 Bonn Germany
| | - Jennifer Zablocki
- Kekulé-Institute for Organic Chemistry and Biochemistry University of Bonn Gerhard-Domagk-Str. 1 D-53121 Bonn Germany
| | - Marc Schmidtmann
- Department of Chemistry University of Oldenburg Carl-von-Ossietzky-Str. 9–11 D-26129 Oldenburg Germany
| | - Klaus Meerholz
- Physical Chemistry University of Cologne Greinstr. 4–6 D-50939 Cologne Germany
| | - N. Serdar Sariciftci
- Linz Institute for Solar Cells Johannes Kepler University Altenberger Str. 69 A-4040 Linz Austria
| | - Luca Beverina
- Department of Materials Chemistry and INSTM University of Milano-Bicocca Via R. Cozzi 53 I-20125 Milano Italy
| | - Arne Lützen
- Kekulé-Institute for Organic Chemistry and Biochemistry University of Bonn Gerhard-Domagk-Str. 1 D-53121 Bonn Germany
| | - Manuela Schiek
- Linz Institute for Solar Cells Johannes Kepler University Altenberger Str. 69 A-4040 Linz Austria
- Center for Surface- and Nanoanalytics and Linz Institute for Solar Cells Johannes Kepler University Altenberger Str. 69 A-4040 Linz Austria
- Institute of Physics University of Oldenburg Carl-von-Ossietzky-Str. 9–11 D-26129 Oldenburg Germany
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Fischer M, Manßen M, Schmidtmann M, Klüner T, Beckhaus R. Selective propargylic C(sp 3)-H activation of methyl-substituted alkynes versus [2 + 2] cycloaddition at a titanium imido template. Chem Sci 2021; 12:13711-13718. [PMID: 34760155 PMCID: PMC8549805 DOI: 10.1039/d1sc04334j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Accepted: 09/27/2021] [Indexed: 11/29/2022] Open
Abstract
The reaction of the titanium imido complex 1b with 2-butyne leads to the formation of the titanium azadiene complex 2a at ambient temperature instead of yielding the archetypical [2 + 2] cycloaddition product (titanaazacyclobutene) which is usually obtained by combining titanium imido complexes and internal alkynes. The formation of 2a is presumably caused by an initial propargylic C(sp3)–H activation step and quantum chemical calculations suggest that the outcome of this unexpected reactivity is thermodynamically favored. The previously reported titanaazacyclobutene I (which is obtained by reacting 1b with 1-phenyl-1-propyne) undergoes a rearrangement reaction at elevated temperature to give the corresponding five-membered titanium azadiene complex 2b. An unexpected reactivity between a titanium imido complex and internal alkynes was unveiled yielding titanaazacyclobutenes instead of the expected [2 + 2] cycloaddition products.![]()
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Affiliation(s)
- Malte Fischer
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford South Parks Road Oxford OX1 3QR UK .,Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg Postfach 2503 D-26111 Oldenburg Germany
| | - Manfred Manßen
- Anorganische Chemie Universität Tübingen Auf der Morgenstelle 18 D-72076 Tübingen Germany .,Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg Postfach 2503 D-26111 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg Postfach 2503 D-26111 Oldenburg Germany
| | - Thorsten Klüner
- Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg Postfach 2503 D-26111 Oldenburg Germany
| | - Rüdiger Beckhaus
- Institut für Chemie, Fakultät für Mathematik und Naturwissenschaften, Carl von Ossietzky Universität Oldenburg Postfach 2503 D-26111 Oldenburg Germany
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28
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de Graaff S, Chandi A, Schmidtmann M, Beckhaus R. Cooperative Reactions of Pentafulvene Niobium Complexes: Formation of Alkylidene, Imido, Hydrazido, and Niobaaziridine Complexes. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00404] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Simon de Graaff
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Amrit Chandi
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Marc Schmidtmann
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
| | - Rüdiger Beckhaus
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Federal Republic of Germany
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Reinhold CRW, Schmidtmann M, Tumanskii B, Müller T. Front Cover: Radicals and Anions of Siloles and Germoles (Chem. Eur. J. 47/2021). Chemistry 2021. [DOI: 10.1002/chem.202102217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Crispin R. W. Reinhold
- Institute of Chemistry Carl von Ossietzky University Oldenburg Carl von Ossietzky-Str. 9–11 26129 Oldenburg Germany, European Union
| | - Marc Schmidtmann
- Institute of Chemistry Carl von Ossietzky University Oldenburg Carl von Ossietzky-Str. 9–11 26129 Oldenburg Germany, European Union
| | - Boris Tumanskii
- Schulich Faculty of Chemistry Technion-Israel Institute of Technology Haifa 32000 Israel
| | - Thomas Müller
- Institute of Chemistry Carl von Ossietzky University Oldenburg Carl von Ossietzky-Str. 9–11 26129 Oldenburg Germany, European Union
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30
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Abstract
The synthesis of persistent sila- and germacyclopentadienyl (silolyl- and germolyl-) radicals by careful stoichiometric reduction of the corresponding halides with potassium is reported. The radicals were characterized by EPR spectroscopy and trapping reactions. The reduction of tris(trimethylsilyl)silyl-substituted halides was successful while smaller substituents (i. e., t-Butyl, Ph) gave the corresponding dimers. The EPR spectroscopic parameter of the synthesized tetrolyl radicals indicate only small spin delocalization to the butadiene unit due to cross-hyperconjugation. Silolyl- and germolyl anions are unavoidable byproducts and are isolated in the form of their potassium salts and characterized by X-ray crystallography. The comparison of the molecular structures of two closely related potassium silolides provided an example for different coordination of the potassium cation to the silolyl anion (η1 vs. η5 coordination) that triggers the switch between delocalized and localized states.
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Affiliation(s)
- Crispin R. W. Reinhold
- Institute of ChemistryCarl von Ossietzky University OldenburgCarl von Ossietzky-Str. 9–1126129OldenburgGermany, European Union
| | - Marc Schmidtmann
- Institute of ChemistryCarl von Ossietzky University OldenburgCarl von Ossietzky-Str. 9–1126129OldenburgGermany, European Union
| | - Boris Tumanskii
- Schulich Faculty of ChemistryTechnion-Israel Institute of TechnologyHaifa32000Israel
| | - Thomas Müller
- Institute of ChemistryCarl von Ossietzky University OldenburgCarl von Ossietzky-Str. 9–1126129OldenburgGermany, European Union
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Schröder N, Schmidtmann M, Christoffers J. Diaminoterephthalate‐EDTA and ‐EGTA Conjugates – “Turn on” Fluorescence Sensors for Zinc Ions. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100641] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Nils Schröder
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
| | - Jens Christoffers
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
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Schröder N, Schmidtmann M, Christoffers J. Cover Feature: Diaminoterephthalate‐EDTA and ‐EGTA Conjugates – “Turn on” Fluorescence Sensors for Zinc Ions (Eur. J. Org. Chem. 30/2021). European J Org Chem 2021. [DOI: 10.1002/ejoc.202100867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nils Schröder
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
| | - Jens Christoffers
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
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Reinhold CRW, Schmidtmann M, Tumanskii B, Müller T. Radicals and Anions of Siloles and Germoles. Chemistry 2021; 27:12011. [PMID: 34228370 DOI: 10.1002/chem.202102218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Invited for the cover of this issue is the group of Thomas Müller at the University of Oldenburg. The image shows the calculated spin distribution of a persistent silacyclopentadienyl radical. Read the full text of the article at 10.1002/chem.202101415.
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Affiliation(s)
- Crispin R W Reinhold
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany
| | - Boris Tumanskii
- Schulich Faculty of Chemistry, Technion-Israel Institute of Technology, Haifa, 32000, Israel
| | - Thomas Müller
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany
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Geik D, Rosien M, Bielefeld J, Schmidtmann M, Doye S. Titanium‐Catalyzed Intermolecular Hydroaminoalkylation of Alkenes with Tertiary Amines. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202100431] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Dennis Geik
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Michael Rosien
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Jens Bielefeld
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Sven Doye
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
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Geik D, Rosien M, Bielefeld J, Schmidtmann M, Doye S. Titanium-Catalyzed Intermolecular Hydroaminoalkylation of Alkenes with Tertiary Amines. Angew Chem Int Ed Engl 2021; 60:9936-9940. [PMID: 33621392 PMCID: PMC8251730 DOI: 10.1002/anie.202100431] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Indexed: 12/14/2022]
Abstract
The first cationic titanium catalyst system for the intermolecular hydroaminoalkylation of alkenes with various tertiary alkylamines is presented. Corresponding reactions which involve the addition of the α‐C−H bond of a tertiary amine across the C−C double bond of an alkene take place at temperatures close to room temperature with excellent regioselectivity to deliver the branched products exclusively. Interestingly, for selected amines, α‐C−H bond activation occurs not only at N‐methyl but also at N‐methylene groups.
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Affiliation(s)
- Dennis Geik
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
| | - Michael Rosien
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
| | - Jens Bielefeld
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
| | - Marc Schmidtmann
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
| | - Sven Doye
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Straße 9-11, 26129, Oldenburg, Germany
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Kaper T, Fischer M, Thye H, Geik D, Schmidtmann M, Beckhaus R, Doye S. Cover Feature: Intermolecular Hydroaminoalkylation of Alkynes (Chem. Eur. J. 23/2021). Chemistry 2021. [DOI: 10.1002/chem.202100495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tobias Kaper
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Strasse 9–11 26129 Oldenburg Germany
| | - Malte Fischer
- Leibniz-Institut für Katalyse e.V. (LIKAT) Albert-Einstein-Straße 29A 18059 Rostock Germany
| | - Hermann Thye
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Strasse 9–11 26129 Oldenburg Germany
| | - Dennis Geik
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Strasse 9–11 26129 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Strasse 9–11 26129 Oldenburg Germany
| | - Ruediger Beckhaus
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Strasse 9–11 26129 Oldenburg Germany
| | - Sven Doye
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Strasse 9–11 26129 Oldenburg Germany
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Abstract
Treatment of potassium salts of silole dianions with donor stabilised germanium dichlorides gave the anticipated silagermafulvenylidenes R2Si = Ge(Do) (R2Si = 1-silacyclopentadiendiyl, Do = N-heterocyclic carbene (NHC)) only as transient intermediates in a side reaction. They were detected by NMR spectroscopy and, in one case, the formal dimer, 2,4-disila-1λ3,3λ3-digermetane, was isolated. The main products of these reactions are sila-bis-λ3-germiranes, i.e. directly interconnected digermylenes that are part of a three-membered ring. The structural data, supported by the results of density functional calculations confirm the digermylene nature of these products with a long inner cyclic Ge-Ge bond that decreases the inherent high ring strain in silagermiranes.
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Affiliation(s)
- Zhaowen Dong
- Institute of Chemistry, Carl von Ossietzky University of Oldenburg Carl von Ossietzky-Str. 9-11 D-26129 Oldenburg Federal Republic of Germany .,Institut des Sciences et Ingénierie Chimiques, Ecole Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Jan Mathis Winkler
- Institute of Chemistry, Carl von Ossietzky University of Oldenburg Carl von Ossietzky-Str. 9-11 D-26129 Oldenburg Federal Republic of Germany
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University of Oldenburg Carl von Ossietzky-Str. 9-11 D-26129 Oldenburg Federal Republic of Germany
| | - Thomas Müller
- Institute of Chemistry, Carl von Ossietzky University of Oldenburg Carl von Ossietzky-Str. 9-11 D-26129 Oldenburg Federal Republic of Germany
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Abstract
Intermolecular hydroaminoalkylation reactions of alkynes with secondary amines, which selectively give access to allylic amines with E configuration of the alkene unit, are achieved in the presence of titanium catalysts. Successful reactions of symmetrically substituted diaryl‐ and dialkylalkynes as well as a terminal alkyne take place with N‐benzylanilines, N‐alkylanilines, and N‐alkylbenzylamines.
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Affiliation(s)
- Tobias Kaper
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Malte Fischer
- Leibniz-Institut für Katalyse e.V. (LIKAT), Albert-Einstein-Straße 29A, 18059, Rostock, Germany
| | - Hermann Thye
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Dennis Geik
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Marc Schmidtmann
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Ruediger Beckhaus
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
| | - Sven Doye
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Strasse 9-11, 26129, Oldenburg, Germany
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Warsitz M, Rohjans SH, Schmidtmann M, Doye S. Hydroaminoalkylation/Buchwald‐Hartwig Amination Sequences for the Synthesis of Novel Thieno‐ or Benzothieno‐Annulated Tetrahydropyridines, Tetrahydroazasilines, and Tetrahydroazasilepines. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001523] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Michael Warsitz
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Stefan H. Rohjans
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
| | - Sven Doye
- Institut für Chemie Universität Oldenburg Carl-von-Ossietzky-Straße 9–11 26129 Oldenburg Germany
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Merk A, Bührmann L, Kordts N, Görtemaker K, Schmidtmann M, Müller T. Intramolecular Halo Stabilization of Silyl Cations-Silylated Halonium- and Bis-Halo-Substituted Siliconium Borates. Chemistry 2021; 27:3496-3503. [PMID: 33184927 PMCID: PMC7898513 DOI: 10.1002/chem.202004838] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2020] [Indexed: 11/24/2022]
Abstract
The stabilizing neighboring effect of halo substituents on silyl cations was tested for a series of peri‐halo substituted acenaphthyl‐based silyl cations 3. The chloro‐ (3 b), bromo‐ (3 c), and iodo‐ (3 d) stabilized cations were synthesized by the Corey protocol. Structural and NMR spectroscopic investigations for cations 3 b–d supported by the results of density functional calculations, which indicate their halonium ion nature. According to the fluorobenzonitrile (FBN) method, the silyl Lewis acidity decreases along the series of halonium ions 3, the fluoronium ion 3 a being a very strong and the iodonium ion 3 d a moderate Lewis acid. Halonium ions 3 b and 3 c react with starting silanes in a substituent redistribution reaction and form siliconium ions 4 b and 4 c. The structure of siliconium borate 4 c2[B12Br12] reveals the trigonal bipyramidal coordination environment of the silicon atom with the two bromo substituents in the apical positions.
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Affiliation(s)
- Anastasia Merk
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Lukas Bührmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Natalie Kordts
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Katharina Görtemaker
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Thomas Müller
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
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Frerichs N, Lukas L, Schmidtmann M, Beckhaus R. Front Cover: Tris(dicyclohexylamido) Group 4 Metal Allyl and Phenylacetylide Complexes – Synthesis and Characterization (Eur. J. Inorg. Chem. 45/2020). Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000991] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Nils Frerichs
- Institut für Chemie Fakultät für Mathematik und Naturwissenschaften Carl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Lenard Lukas
- Institut für Chemie Fakultät für Mathematik und Naturwissenschaften Carl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie Fakultät für Mathematik und Naturwissenschaften Carl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Rüdiger Beckhaus
- Institut für Chemie Fakultät für Mathematik und Naturwissenschaften Carl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
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Frerichs N, Lukas L, Schmidtmann M, Beckhaus R. Tris(dicyclohexylamido) Group 4 Metal Allyl and Phenylacetylide Complexes – Synthesis and Characterization. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Nils Frerichs
- Institut für Chemie Fakultät für Mathematik und Naturwissenschaften Carl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Lenard Lukas
- Institut für Chemie Fakultät für Mathematik und Naturwissenschaften Carl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie Fakultät für Mathematik und Naturwissenschaften Carl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Rüdiger Beckhaus
- Institut für Chemie Fakultät für Mathematik und Naturwissenschaften Carl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
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Affiliation(s)
- Anna Dierks
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
| | - Lukas Fliegel
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
| | - Jens Christoffers
- Institut für Chemie Carl von Ossietzky Universität Oldenburg 26111 Oldenburg Germany
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Künzler S, Rathjen S, Rüger K, Würdemann MS, Wernke M, Tholen P, Girschik C, Schmidtmann M, Landais Y, Müller T. Chiral Chalcogenyl-Substituted Naphthyl- and Acenaphthyl-Silanes and Their Cations. Chemistry 2020; 26:16441-16449. [PMID: 32627900 PMCID: PMC7756486 DOI: 10.1002/chem.202002977] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2020] [Revised: 07/02/2020] [Indexed: 11/30/2022]
Abstract
Cyclic silylated chalconium borates 13[B(C6F5)4] and 14[B(C6F5)4] with peri‐acenaphthyl and peri‐naphthyl skeletons were synthesized from unsymmetrically substituted silanes 3, 4, 6, 7, 9 and 10 using the standard Corey protocol (Chalcogen Ch=O, S, Se, Te). The configuration at the chalcogen atom is trigonal pyramidal for Ch=S, Se, Te, leading to the formation of cis‐ and trans‐isomers in the case of phenylmethylsilyl cations. With the bulkier tert‐butyl group at silicon, the configuration at the chalcogen atoms is predetermined to give almost exclusively the trans‐configurated cyclic silylchalconium ions. The barriers for the inversion of the configuration at the sulfur atoms of sulfonium ions 13 c and 14 a are substantial (72–74 kJ mol−1) as shown by variable temperature NMR spectroscopy. The neighboring group effect of the thiophenyl substituent is sufficiently strong to preserve chiral information at the silicon atom at low temperatures.
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Affiliation(s)
- Sandra Künzler
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Saskia Rathjen
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Katherina Rüger
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Marie S Würdemann
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Marcel Wernke
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Patrik Tholen
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Corinna Girschik
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Marc Schmidtmann
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
| | - Yannick Landais
- Institute of Molecular Sciences (ISM), University of Bordeaux, CNRS, UMR-5255, 351 Cours de la libération, 33400, Talence, France, European Union
| | - Thomas Müller
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, Carl von Ossietzky-Str. 9-11, 26129, Oldenburg, Germany, European Union
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Frerichs N, Schmidtmann M, Beckhaus R. Tetrakis(dicyclohexylamido)zirconium(IV). IUCr Data 2020; 5:x201145. [PMID: 36338916 PMCID: PMC9462282 DOI: 10.1107/s2414314620011451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2020] [Accepted: 08/20/2020] [Indexed: 11/23/2022] Open
Abstract
The crystal structure of Zr(C12H22N)4 is isotypic with its cerium(IV) analogue. The reaction of ZrCl4 with three equivalents of LiNCy2 (Cy is cyclohexyl) resulted in the formation of tris(dicyclohexylamido)zirconium chloride and the title compound, [Zr(C12H22N)4]. The latter is isotypic with its cerium(IV) analogue and crystallizes with three independent molecules in the asymmetric unit. One molecule is located about a twofold rotation axis, and the other two on fourfold inversion axes. In each molecule, the ZrIV atom has a distorted tetrahedral coordination environment. The crystal under investigation was twinned by inversion in a 1:1 ratio.![]()
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Fischer M, Wolff MC, del Horno E, Schmidtmann M, Beckhaus R. Synthesis, Reactivity, and Insights into the Lewis Acidity of Mononuclear Titanocene Imido Complexes Bearing Sterically Demanding Terphenyl Moieties. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00452] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Malte Fischer
- Leibniz-Institut für Katalyse e.V. an der Universität Rostock, D-18059 Rostock, Germany
| | - Marie Christin Wolff
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Germany
| | - Estefanía del Horno
- Departamento de Química Orgánica y Química Inorgánica, Universidad de Alcalá, 28805 Alcalá de Henares-Madrid, Spain
| | - Marc Schmidtmann
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Germany
| | - Rüdiger Beckhaus
- Institut für Chemie, Carl von Ossietzky Universität Oldenburg, D-26111 Oldenburg, Germany
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Abstract
By changing the dimethylamino to a nitro group, a novel synthetic access to the spirocyclic opioid analgesic cebranopadol was developed that is much more efficient compared with the established route. On the basis of the α-acidity of α-nitrotoluene, the two-fold Michael addition to acrylate gave an acyclic precursor compound, which was easily transformed by Dieckmann condensation and decarboxylation to the cyclohexanone derivative needed for the annulation of the indole ring by an oxa-Pictet-Spengler reaction. As an additional benefit, the reduction of the nitro group furnished an amine, which could be late-stage-diversified to carboxamides, sulfonamides, ureas, and N-alkyl congeners. The transformation of the nitro group at the spirocyclic scaffold to the dimethylamino function of the actual title compound was achieved in one step with zinc/formic acid/formaldehyde in 83% yield.
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Affiliation(s)
- Daniel Wachtendorf
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Str. 9-11, D-26111 Oldenburg, Germany
| | - Marc Schmidtmann
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Str. 9-11, D-26111 Oldenburg, Germany
| | - Jens Christoffers
- Institut für Chemie, Universität Oldenburg, Carl-von-Ossietzky-Str. 9-11, D-26111 Oldenburg, Germany
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Abstract
The first examples of titanium-catalyzed hydroaminoalkylation reactions of ethylene with secondary amines are presented. The reactions can be achieved with various titanium catalysts and they do not require the use of high pressure equipment. In addition, the first solid-state structure of a titanapyrrolidine that is formed by insertion of an alkene into the Ti-C bond of a titanaaziridine is reported.
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Affiliation(s)
- Michael Rosien
- Institut für ChemieUniversität OldenburgCarl-von-Ossietzky-Straße 9–1126129OldenburgGermany
| | - Iris Töben
- Institut für ChemieUniversität OldenburgCarl-von-Ossietzky-Straße 9–1126129OldenburgGermany
| | - Marc Schmidtmann
- Institut für ChemieUniversität OldenburgCarl-von-Ossietzky-Straße 9–1126129OldenburgGermany
| | - Rüdiger Beckhaus
- Institut für ChemieUniversität OldenburgCarl-von-Ossietzky-Straße 9–1126129OldenburgGermany
| | - Sven Doye
- Institut für ChemieUniversität OldenburgCarl-von-Ossietzky-Straße 9–1126129OldenburgGermany
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Abstract
The reactions of dipotassium germacyclopentadienediide with two Group 13 dichlorides, Cp*BCl2 and Cp*AlCl2, yield two structurally different products. In the case of boron a borole complex of germanium(ii) is obtained. The aluminium halide gives an unprecedented neutral germaaluminocene. Both compounds were fully characterised by multinuclear NMR spectroscopy supported by DFT computations. The molecular structure of the germaaluminocene was determined by XRD.
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Affiliation(s)
- Lena Albers
- Institute of Chemistry, Carl von Ossietzky University Oldenburg Carl von Ossietzky-Straße 9-11 D-26129 Oldenburg Federal Republic of Germany
| | - Patrik Tholen
- Institute of Chemistry, Carl von Ossietzky University Oldenburg Carl von Ossietzky-Straße 9-11 D-26129 Oldenburg Federal Republic of Germany
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg Carl von Ossietzky-Straße 9-11 D-26129 Oldenburg Federal Republic of Germany
| | - Thomas Müller
- Institute of Chemistry, Carl von Ossietzky University Oldenburg Carl von Ossietzky-Straße 9-11 D-26129 Oldenburg Federal Republic of Germany
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Ossinger S, Näther C, Buchholz A, Schmidtmann M, Mangelsen S, Beckhaus R, Plass W, Tuczek F. Spin Transition of an Iron(II) Organoborate Complex in Different Polymorphs and in Vacuum-Deposited Thin Films: Influence of Cooperativity. Inorg Chem 2020; 59:7966-7979. [PMID: 32036663 DOI: 10.1021/acs.inorgchem.9b03354] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
Two polymorphic modifications (1-I and 1-II) of the new spin crossover (SCO) complex [Fe{H2B(pz)(pypz)}2] (pz = pyrazole, pypz = pyridylpyrazole; 1) were prepared and investigated by differential scanning calorimetry (DSC), magnetic measurements, Mößbauer, vibrational, and absorption spectroscopy as well as single-crystal and X-ray powder diffraction. DSC measurements reveal that upon heating the thermodynamically metastable form 1-II to ∼178 °C it transforms into 1-I in an exothermic reaction, which proves that these modifications are related by monotropism. Both forms show thermal SCO with T1/2 values of 390 K (1-II) and 270 K (1-I). An analysis of the crystal structures of 1-II and the corresponding Zn(II) (2) and Co(II) (3) complexes that are isotypic with 1-I reveals that form II consists of dimers coupled by strong intramolecular π···π interactions, which is not the case for 1-I. In agreement with these findings, investigations of thin films of 1, where significant π···π interactions should be absent, reveal SCO behavior similar to that of 1-I. These results underscore the importance of cooperativity for the spin-transition behavior of this class of complexes.
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Affiliation(s)
- Sascha Ossinger
- Institute of Inorganic Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Str.2, 24118 Kiel, Germany
| | - Christian Näther
- Institute of Inorganic Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Str.2, 24118 Kiel, Germany
| | - Axel Buchholz
- Institute of Inorganic and Analytical Chemistry, Friedrich-Schiller-University, 07743 Jena, Germany
| | - Marc Schmidtmann
- Institute for Chemistry, Carl von Ossietzky University Oldenburg, 26111 Oldenburg, Germany
| | - Sebastian Mangelsen
- Institute of Inorganic Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Str.2, 24118 Kiel, Germany
| | - Rüdiger Beckhaus
- Institute for Chemistry, Carl von Ossietzky University Oldenburg, 26111 Oldenburg, Germany
| | - Winfried Plass
- Institute of Inorganic and Analytical Chemistry, Friedrich-Schiller-University, 07743 Jena, Germany
| | - Felix Tuczek
- Institute of Inorganic Chemistry, Christian-Albrechts-University Kiel, Max-Eyth-Str.2, 24118 Kiel, Germany
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