1
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Bauer JO. Influence of Amino Functions on the Coordination Ability of Silyl Ethers and Disiloxanes. Organometallics 2022. [DOI: 10.1021/acs.organomet.1c00663] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jonathan O. Bauer
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie, Universität Regensburg, Universitätsstraße 31, Regensburg D-93053, Germany
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2
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Kirchhoff JL, Brieger L, Strohmann C. Crystal structure and Hirshfeld surface analysis of ( S)- N-methyl-1-phenyl-ethan-1-aminium chloride. Acta Crystallogr E Crystallogr Commun 2022; 78:130-134. [PMID: 35145738 PMCID: PMC8819438 DOI: 10.1107/s2056989021013645] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2021] [Accepted: 12/28/2021] [Indexed: 12/03/2022]
Abstract
The title compound C9H14N+·Cl-, (1), can be synthesized starting from (S)-N-methyl-1-phenyl-ethan-1-amine (2). Compound 2 upon addition of HCl·Et2O leads to crystallization of compound 1 as colorless blocks. The configuration of compound 1 is stable as well as preserved in space group P212121. Ammonium chlorides, like the title compound, are often observed as undesirable by-products in amino-silylation of chloro-silanes. Additionally, these by-products are usually soluble in selected organic solvents, which require difficult separation steps. Therefore, detailed studies on structural features and inter-molecular inter-actions performed by Hirshfeld atom refinement (HAR) using NoSpherA2 [Kleemiss et al. (2021 ▸). Chem. Sci. 12, 1675-1692] and Hirshfeld surface analysis were used to address structural issues on that separation problem.
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Affiliation(s)
- Jan-Lukas Kirchhoff
- Technische Universität Dortmund, Fakultät Chemie und Chemische Biologie, Otto-Hahn-Strasse 6, 44227 Dortmund, Germany
| | - Lukas Brieger
- Technische Universität Dortmund, Fakultät Chemie und Chemische Biologie, Otto-Hahn-Strasse 6, 44227 Dortmund, Germany
| | - Carsten Strohmann
- Technische Universität Dortmund, Fakultät Chemie und Chemische Biologie, Otto-Hahn-Strasse 6, 44227 Dortmund, Germany
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3
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Götz T, Falk A, Bauer JO. Molecular Scissors for Tailor-Made Modification of Siloxane Scaffolds. Chemistry 2021; 28:e202103531. [PMID: 34761842 PMCID: PMC9299477 DOI: 10.1002/chem.202103531] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2021] [Indexed: 01/07/2023]
Abstract
The controlled design of functional oligosiloxanes is an important topic in current research. A consecutive Si−O−Si bond cleavage/formation using siloxanes that are substituted with 1,2‐diaminobenzene derivatives acting as molecular scissors is presented. The method allows to cut at certain positions of a siloxane scaffold forming a cyclic diaminosilane or ‐siloxane intermediate and then to introduce new functional siloxy units. The procedure could be extended to a direct one‐step cleavage of chlorooligosiloxanes. Both siloxane formation and cleavage proceed with good to excellent yields, high regioselectivity, and great variability of the siloxy units. Control of the selectivity is achieved by the choice of the amino substituent. Insight into the mechanism was provided by low temperature NMR studies and the isolation of a lithiated intermediate.
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Affiliation(s)
- Tobias Götz
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie, Universität Regensburg, Universitätsstraße 31, D-93053, Regensburg, Germany
| | - Alexander Falk
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie, Universität Regensburg, Universitätsstraße 31, D-93053, Regensburg, Germany
| | - Jonathan O Bauer
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie, Universität Regensburg, Universitätsstraße 31, D-93053, Regensburg, Germany
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4
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Achternbosch M, Zibula L, Kirchhoff JL, Bauer JO, Strohmann C. Primary Amine Functionalization of Alkoxysilanes: Synthesis, Selectivity, and Mechanistic Insights. Inorg Chem 2021; 60:11562-11568. [PMID: 34240858 DOI: 10.1021/acs.inorgchem.1c01529] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We report a highly selective substitution of silicon-bound methoxy groups by primary lithium amides. This unusual reactivity is possible because of the formation of particularly stable lithium methoxide, which compensates for the decreased Si-N bond enthalpy compared to Si-O bonds. In contrast to substitution reactions on halosilanes, highly selective monosubstitutions under mild conditions are possible, even in the presence of further reactive methoxy groups. A combination of experiments and density functional theory calculations was carried out in order to get an extensive understanding of the reaction. The calculations reveal a possible reaction mechanism with considerably low activation barriers and the entry of the nucleophile to be the rate-determining step. The low activation energies allow for the substitutions to be carried out at low temperatures, therefore preventing side reactions from occurring. The presented investigations expand the view of fundamental transformation processes on silicon and give access to a wide variety of functionalized silicon-based building blocks for various fields of chemistry.
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Affiliation(s)
- Moritz Achternbosch
- Institut für Anorganische Chemie, Fakultät für Chemie und Chemische Biologie Technische Universität Dortmund Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany
| | - Lukas Zibula
- Institut für Anorganische Chemie, Fakultät für Chemie und Chemische Biologie Technische Universität Dortmund Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany
| | - Jan-Lukas Kirchhoff
- Institut für Anorganische Chemie, Fakultät für Chemie und Chemische Biologie Technische Universität Dortmund Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany
| | - Jonathan O Bauer
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstrasse 31, D-93053 Regensburg, Germany
| | - Carsten Strohmann
- Institut für Anorganische Chemie, Fakultät für Chemie und Chemische Biologie Technische Universität Dortmund Otto-Hahn-Strasse 6, D-44227 Dortmund, Germany
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Abstract
Abstract
C23H28OSi, monoclinic, P21/c (no. 14), a = 14.2882(11) Å, b = 17.8169(10) Å, c = 7.6201(6) Å, β = 103.780(8)°, V = 1884.0(2) Å3, Z = 4, R
gt
(F) = 0.0538, wR
ref
(F
2) = 0.1241, T = 173(2) K.
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Affiliation(s)
- Jonathan O. Bauer
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie, Universität Regensburg , Universitätsstraße 31, D-93053 Regensburg , Germany
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6
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Bauer JO, Espinosa‐Jalapa NA, Fontana N, Götz T, Falk A. Functional Group Variation in
tert
‐Butyldiphenylsilanes (TBDPS): Syntheses, Reactivities, and Effects on the Intermolecular Interaction Pattern in the Molecular Crystalline State. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100342] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Jonathan O. Bauer
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
| | - Noel Angel Espinosa‐Jalapa
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
| | - Nicolò Fontana
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
| | - Tobias Götz
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
| | - Alexander Falk
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
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7
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Bauer JO. Crystal Structure and Hirshfeld Surface Analysis of Trimethoxy(1‐naphthyl)silane – Intermolecular Interactions in a One‐Component Single‐Crystalline Trimethoxysilane. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100027] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Jonathan O. Bauer
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 D-93053 Regensburg Germany
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8
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Chloropentaphenyldisiloxane—Model Study on Intermolecular Interactions in the Crystal Structure of a Monofunctionalized Disiloxane. CHEMISTRY 2021. [DOI: 10.3390/chemistry3020033] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Small functional siloxane units have gained great interest as molecular model systems for mimicking more complex silicate structures both in nature and in materials chemistry. The crystal structure of chloropentaphenyldisiloxane, which was synthesized for the first time, was elucidated by single-crystal X-ray diffraction analysis. The molecular crystal packing was studied in detail using state-of-the-art Hirshfeld surface analysis together with a two-dimensional fingerprint mapping of the intermolecular interactions. It was found that the phenyl C–H bonds act as donors for both weak C–H···π and C–H···Cl hydrogen bond interactions. The influence of intramolecular Si–O–Si bond parameters on the acceptor capability of functional groups in intermolecular hydrogen bond interactions is discussed.
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9
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Bauer JO, Strohmann C. Unusual Coordination Pattern of the Lithium Center in a Chiral α-Lithiated Silicon Compound. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00756] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jonathan O. Bauer
- Institut für Anorganische Chemie, Fakultät für Chemie und Pharmazie, Universität Regensburg, Universitätsstraße 31, D-93053 Regensburg, Germany
| | - Carsten Strohmann
- Institut für Anorganische Chemie, Fakultät für Chemie und Chemische Biologie, Technische Universität Dortmund, Otto-Hahn-Straße 6, D-44227 Dortmund, Germany
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10
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Zibula L, Achternbosch M, Wattenberg J, Otte F, Strohmann C. Influences of Steric Factors on the Reactivity and Structure of Diorganoalkoxysilylamides. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000039] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lukas Zibula
- Institute of Inorganic Chemistry TU Dortmund University Otto‐Hahn‐Str. 6 44227 Dortmund Germany
| | - Moritz Achternbosch
- Institute of Inorganic Chemistry TU Dortmund University Otto‐Hahn‐Str. 6 44227 Dortmund Germany
| | - Jonathan Wattenberg
- Institute of Inorganic Chemistry TU Dortmund University Otto‐Hahn‐Str. 6 44227 Dortmund Germany
| | - Felix Otte
- Institute of Inorganic Chemistry TU Dortmund University Otto‐Hahn‐Str. 6 44227 Dortmund Germany
| | - Carsten Strohmann
- Institute of Inorganic Chemistry TU Dortmund University Otto‐Hahn‐Str. 6 44227 Dortmund Germany
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11
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Espinosa‐Jalapa NA, Bauer JO. Controlled Synthesis and Molecular Structures of Methoxy‐, Amino‐, and Chloro‐Functionalized Disiloxane Building Blocks. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000049] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Noel Angel Espinosa‐Jalapa
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
| | - Jonathan O. Bauer
- Institut für Anorganische Chemie Fakultät für Chemie und Pharmazie Universität Regensburg Universitätsstraße 31 93053 Regensburg Germany
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12
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Espinosa-Jalapa NA, Berg N, Seidl M, Shenderovich IG, Gschwind RM, Bauer JO. Complexation behaviour of LiCl and LiPF6– model studies in the solid-state and in solution using a bidentate picolyl-based ligand. Chem Commun (Camb) 2020; 56:13335-13338. [DOI: 10.1039/d0cc05682k] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Using a new bulky bidentate ligand and combining various structure elucidation methods, coordination modes of [ligand·LiX] (X = Cl, PF6) complexes both in solid-state and in solution have been revealed.
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Affiliation(s)
- Noel Angel Espinosa-Jalapa
- Institut für Anorganische Chemie
- Fakultät für Chemie und Pharmazie
- Universität Regensburg
- D-93053 Regensburg
- Germany
| | - Nele Berg
- Institut für Organische Chemie
- Fakultät für Chemie und Pharmazie
- Universität Regensburg
- D-93053 Regensburg
- Germany
| | - Michael Seidl
- Institut für Anorganische Chemie
- Fakultät für Chemie und Pharmazie
- Universität Regensburg
- D-93053 Regensburg
- Germany
| | - Ilya G. Shenderovich
- Institut für Organische Chemie
- Fakultät für Chemie und Pharmazie
- Universität Regensburg
- D-93053 Regensburg
- Germany
| | - Ruth M. Gschwind
- Institut für Organische Chemie
- Fakultät für Chemie und Pharmazie
- Universität Regensburg
- D-93053 Regensburg
- Germany
| | - Jonathan O. Bauer
- Institut für Anorganische Chemie
- Fakultät für Chemie und Pharmazie
- Universität Regensburg
- D-93053 Regensburg
- Germany
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13
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Bauer JO, Strohmann C. Synthesis and molecular structure of a zwitterionic ZnI2 silanolate. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.09.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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14
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Koller SG, Bauer JO, Strohmann C. Selektive Si-C(sp3
)-Bindungsspaltung in (Aminomethyl)silanen durch carbanionische Nucleophile und ihr stereochemischer Verlauf. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201702410] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Stephan G. Koller
- Anorganische Chemie; Technische Universität Dortmund; Otto-Hahn-Straße 6 44227 Dortmund Deutschland
| | - Jonathan O. Bauer
- Anorganische Chemie; Technische Universität Dortmund; Otto-Hahn-Straße 6 44227 Dortmund Deutschland
- Institut für Anorganische Chemie; Universität Regensburg; Deutschland
| | - Carsten Strohmann
- Anorganische Chemie; Technische Universität Dortmund; Otto-Hahn-Straße 6 44227 Dortmund Deutschland
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15
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Koller SG, Bauer JO, Strohmann C. Selective Si−C(sp3
) Bond Cleavage in (Aminomethyl)silanes by Carbanionic Nucleophiles and Its Stereochemical Course. Angew Chem Int Ed Engl 2017; 56:7991-7994. [DOI: 10.1002/anie.201702410] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2017] [Indexed: 11/05/2022]
Affiliation(s)
- Stephan G. Koller
- Anorganische Chemie; Technische Universität Dortmund; Otto-Hahn-Strasse 6 44227 Dortmund Germany
| | - Jonathan O. Bauer
- Anorganische Chemie; Technische Universität Dortmund; Otto-Hahn-Strasse 6 44227 Dortmund Germany
- Current address: Institut für Anorganische Chemie; Universität Regensburg; Germany
| | - Carsten Strohmann
- Anorganische Chemie; Technische Universität Dortmund; Otto-Hahn-Strasse 6 44227 Dortmund Germany
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16
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Bauer JO, Strohmann C. Recent Progress in Asymmetric Synthesis and Application of Difunctionalized Silicon-Stereogenic Silanes. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600100] [Citation(s) in RCA: 85] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Jonathan O. Bauer
- Anorganische Chemie; Technische Universität Dortmund; Otto-Hahn-Straße 6 44227 Dortmund Germany
- Department of Organic Chemistry; The Weizmann Institute of Science; P. O. Box 26 76100 Rehovot Israel
| | - Carsten Strohmann
- Anorganische Chemie; Technische Universität Dortmund; Otto-Hahn-Straße 6 44227 Dortmund Germany
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17
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Hydrogen bonding principles in inclusion compounds of triphenylsilanol and pyrrolidine: Synthesis and structural features of [(Ph3SiOH)4·HN(CH2)4] and [Ph3SiOH·HN(CH2)4·CH3CO2H]. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2015.07.026] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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18
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Bauer JO, Strohmann C. Stereocontrol in Nucleophilic Substitution Reactions at Silicon: The Role of Permutation in Generating Silicon-Centered Chirality. J Am Chem Soc 2015; 137:4304-7. [PMID: 25803673 DOI: 10.1021/jacs.5b00861] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jonathan O. Bauer
- Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44227 Dortmund, Germany
| | - Carsten Strohmann
- Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Straße 6, 44227 Dortmund, Germany
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19
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Bauer JO, Strohmann C. From an α-functionalized silicon-stereogenic N,O-silane to a monomeric and tetracoordinate tBuLi adduct with lithium-centered chirality. Angew Chem Int Ed Engl 2014; 53:8167-71. [PMID: 24939015 DOI: 10.1002/anie.201404255] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2014] [Indexed: 11/09/2022]
Abstract
Donor-functionalized silanes with stereogenic silicon centers are extremely rare. A convenient stereocontrolled route to a nitrogen-oxygen-functionalized silicon-chiral compound with an additional aminomethyl function is presented. This silane was directly achieved in stereochemically pure form by a simple nucleophilic substitution reaction. Owing to the unique asymmetry of this silane and the presence of three donor functions, the first monomeric butyllithium compound with lithium-centered chirality could be isolated; the configuration was assigned by X-ray crystallography. This [silane⋅ tBuLi] complex undergoes an unexpected deprotonation/stereospecific substitution sequence in toluene, leading to the development of a convenient one-pot synthesis of a functionalized silicon-chiral benzylsilane, which proceeds with inversion of configuration and complete preservation of the stereochemical integrity at silicon.
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Affiliation(s)
- Jonathan O Bauer
- Anorganische Chemie, Technische Universität Dortmund, Otto-Hahn-Strasse 6, 44227 Dortmund (Germany)
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20
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Bauer JO, Strohmann C. Von einem α-funktionalisierten siliciumstereogenen N,O-Silan zu einem monomeren tetrakoordiniertentBuLi-Addukt mit lithiumzentrierter Chiralität. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201404255] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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21
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Bauer JO, Strohmann C. Stereoselektive Synthese siliciumstereogener Aminomethoxysilane: ein einfacher Zugang zu hoch enantiomerenangereicherten Siloxanen. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201307826] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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22
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Bauer JO, Strohmann C. Stereoselective Synthesis of Silicon-Stereogenic Aminomethoxysilanes: Easy Access to Highly Enantiomerically Enriched Siloxanes. Angew Chem Int Ed Engl 2013; 53:720-4. [DOI: 10.1002/anie.201307826] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2013] [Indexed: 11/12/2022]
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23
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Hoffmann F, Wagler J, Roewer G. Transition-Metal Complexes Containing Alkynylsilyl Functionalized η6-Arene Ligands. Organometallics 2013. [DOI: 10.1021/om400378s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Florian Hoffmann
- Institut für
Anorganische Chemie, Technische Universität Bergakademie Freiberg, Leipziger Straße 29, 09596
Freiberg, Germany
| | - Jörg Wagler
- Institut für
Anorganische Chemie, Technische Universität Bergakademie Freiberg, Leipziger Straße 29, 09596
Freiberg, Germany
| | - Gerhard Roewer
- Institut für
Anorganische Chemie, Technische Universität Bergakademie Freiberg, Leipziger Straße 29, 09596
Freiberg, Germany
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