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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; 63:e202403652. [PMID: 38578658 DOI: 10.1002/anie.202403652] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 03/20/2024] [Accepted: 03/21/2024] [Indexed: 04/06/2024]
Abstract
Germaaluminocenes are formed by salt metathesis reactions of dipotassium germacyclopentadienediides with pentamethylcyclopentadienylaluminum 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
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, D-26129, Oldenburg, Germany
| | - Lukas Bührmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, D-26129, Oldenburg, Germany
| | - Lena Albers
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, D-26129, Oldenburg, Germany
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, D-26129, Oldenburg, Germany
| | - Alexander Weiz
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, D-26129, Oldenburg, Germany
| | - Thomas Müller
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky-Str. 9-11, D-26129, Oldenburg, Germany
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2
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Lamač M, Urbán B, Horáček M, Bůžek D, Leonová L, Stýskalík A, Vykydalová A, Škoch K, Kloda M, Mahun A, Kobera L, Lang K, Londesborough MGS, Demel J. "Activated Borane": A Porous Borane Cluster Polymer as an Efficient Lewis Acid-Based Catalyst. ACS Catal 2023; 13:14614-14626. [PMID: 38026813 PMCID: PMC10660343 DOI: 10.1021/acscatal.3c04011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 10/14/2023] [Accepted: 10/16/2023] [Indexed: 12/01/2023]
Abstract
Borane cluster-based porous covalent networks, named activated borane (ActB), were prepared by cothermolysis of decaborane(14) (nido-B10H14) and selected hydrocarbons (toluene, ActB-Tol; cyclohexane, ActB-cyHx; and n-hexane, ActB-nHx) under anaerobic conditions. These amorphous solid powders exhibit different textural and Lewis acid (LA) properties that vary depending on the nature of the constituent organic linker. For ActB-Tol, its LA strength even approaches that of the commonly used molecular LA, B(C6F5)3. Most notably, ActBs can act as heterogeneous LA catalysts in hydrosilylation/deoxygenation reactions with various carbonyl substrates as well as in the gas-phase dehydration of ethanol. These studies reveal the potential of ActBs in catalytic applications, showing (a) the possibility for tuning catalytic reaction outcomes (selectivity) in hydrosilylation/deoxygenation reactions by changing the material's composition and (b) the very high activity toward ethanol dehydration that exceeds the commonly used γ-Al2O3 by achieving a stable conversion of ∼93% with a selectivity for ethylene production of ∼78% during a 17 h continuous period on stream at 240 °C.
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Affiliation(s)
- Martin Lamač
- Department
of Molecular Electrochemistry and Catalysis, J. Heyrovsky Institute of Physical Chemistry of the Czech Academy
of Sciences Dolejškova 2155, 182 00 Prague 8, Czech Republic
| | - Béla Urbán
- Department
of Molecular Electrochemistry and Catalysis, J. Heyrovsky Institute of Physical Chemistry of the Czech Academy
of Sciences Dolejškova 2155, 182 00 Prague 8, Czech Republic
| | - Michal Horáček
- Department
of Molecular Electrochemistry and Catalysis, J. Heyrovsky Institute of Physical Chemistry of the Czech Academy
of Sciences Dolejškova 2155, 182 00 Prague 8, Czech Republic
| | - Daniel Bůžek
- Department
of Materials Chemistry, Institute of Inorganic
Chemistry of the Czech Academy of Sciences, Husinec-Řež 1001, 250 68 Řež, Czech Republic
| | - Lucie Leonová
- Department
of Chemistry, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
| | - Aleš Stýskalík
- Department
of Chemistry, Masaryk University, Kotlářská 2, 611 37 Brno, Czech Republic
| | - Anna Vykydalová
- Department
of Materials Chemistry, Institute of Inorganic
Chemistry of the Czech Academy of Sciences, Husinec-Řež 1001, 250 68 Řež, Czech Republic
| | - Karel Škoch
- Department
of Materials Chemistry, Institute of Inorganic
Chemistry of the Czech Academy of Sciences, Husinec-Řež 1001, 250 68 Řež, Czech Republic
| | - Matouš Kloda
- Department
of Materials Chemistry, Institute of Inorganic
Chemistry of the Czech Academy of Sciences, Husinec-Řež 1001, 250 68 Řež, Czech Republic
| | - Andrii Mahun
- Department
of Structural Analysis, Institute of Macromolecular
Chemistry of the Czech Academy of Sciences, Heyrovského nám. 2, 162 06 Prague 6, Czech Republic
| | - Libor Kobera
- Department
of Structural Analysis, Institute of Macromolecular
Chemistry of the Czech Academy of Sciences, Heyrovského nám. 2, 162 06 Prague 6, Czech Republic
| | - Kamil Lang
- Department
of Materials Chemistry, Institute of Inorganic
Chemistry of the Czech Academy of Sciences, Husinec-Řež 1001, 250 68 Řež, Czech Republic
| | - Michael G. S. Londesborough
- Department
of Materials Chemistry, Institute of Inorganic
Chemistry of the Czech Academy of Sciences, Husinec-Řež 1001, 250 68 Řež, Czech Republic
| | - Jan Demel
- Department
of Materials Chemistry, Institute of Inorganic
Chemistry of the Czech Academy of Sciences, Husinec-Řež 1001, 250 68 Řež, Czech Republic
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3
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Milinkovic A, Dupé A, Belaj F, Mösch-Zanetti NC. Molybdenum(VI) Bis(imido) Complexes: From Frustrated Lewis Pairs to Weakly Coordinating Cations. Chemistry 2022; 28:e202201867. [PMID: 35775999 DOI: 10.1002/chem.202201867] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2022] [Indexed: 01/07/2023]
Abstract
Molybdenum(VI) bis(imido) complexes [Mo(NtBu)2 (LR )2 ] (R=H 1 a; R=CF3 1 b) combined with B(C6 F5 )3 (1 a/B(C6 F5 )3 , 1 b/B(C6 F5 )3 ) exhibit a frustrated Lewis pair (FLP) character that can heterolytically split H-H, Si-H and O-H bonds. Cleavage of H2 and Et3 SiH affords ion pairs [Mo(NtBu)(NHtBu)(LR )2 ][HB(C6 F5 )3 ] (R=H 2 a; R=CF3 2 b) composed of a Mo(VI) amido imido cation and a hydridoborate anion, while reaction with H2 O leads to [Mo(NtBu)(NHtBu)(LR )2 ][(HO)B(C6 F5 )3 ] (R=H 3 a; R=CF3 3 b). Ion pairs 2 a and 2 b are catalysts for the hydrosilylation of aldehydes with triethylsilane, with 2 b being more active than 2 a. Mechanistic elucidation revealed insertion of the aldehyde into the B-H bond of [HB(C6 F5 )3 ]- . We were able to isolate and fully characterize, including by single-crystal X-ray diffraction analysis, the inserted products Mo(NtBu)(NHtBu)(LR )2 ][{PhCH2 O}B(C6 F5 )3 ] (R=H 4 a; R=CF3 4 b). Catalysis occurs at [HB(C6 F5 )3 ]- while [Mo(NtBu)(NHtBu)(LR )2 ]+ (R=H or CF3 ) act as the cationic counterions. However, the striking difference in reactivity gives ample evidence that molybdenum cations behave as weakly coordinating cations (WCC).
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Affiliation(s)
- Angela Milinkovic
- Institute of Chemistry - Inorganic Chemistry, University of Graz, Schubertstraße 1, 8010, Graz
| | - Antoine Dupé
- Institute of Chemistry - Inorganic Chemistry, University of Graz, Schubertstraße 1, 8010, Graz
| | - Ferdinand Belaj
- Institute of Chemistry - Inorganic Chemistry, University of Graz, Schubertstraße 1, 8010, Graz
| | - Nadia C Mösch-Zanetti
- Institute of Chemistry - Inorganic Chemistry, University of Graz, Schubertstraße 1, 8010, Graz
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4
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Dankert F, Fischer M, Hering-Junghans C. Modulating the reactivity of phosphanylidenephosphoranes towards water with Lewis acids. Dalton Trans 2022; 51:11267-11276. [DOI: 10.1039/d2dt01575g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Phosphanylidenephosphoranes of the type R−P(PR’3), also known as phospha-Wittig reagents, can be utilized in a variety of bond activation reactions exploiting their phosphinidenoid reactivity. In here, we thoroughly show that...
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5
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Berry DBG, Clegg I, Codina A, Lyall CL, Lowe JP, Hintermair U. Convenient and accurate insight into solution-phase equilibria from FlowNMR titrations. REACT CHEM ENG 2022. [DOI: 10.1039/d2re00123c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Solution phase titrations are made easy by multi-nuclear FlowNMR spectroscopy with automated, continuous titre addition to give accurate insights into Brønsted acid/base, hydrogen bonding, Lewis acid/base and metal/ligand binding equilibria under native conditions.
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Affiliation(s)
- Daniel B. G. Berry
- Department of Chemistry, University of Bath, Claverton Down, BA2 7AY Bath, UK
- Dynamic Reaction Monitoring Facility, University of Bath, Claverton Down, BA2 7AY Bath, UK
| | - Ian Clegg
- Bruker UK Ltd, Banner Lane, CV4 9GH Coventry, UK
| | - Anna Codina
- Bruker UK Ltd, Banner Lane, CV4 9GH Coventry, UK
| | - Catherine L. Lyall
- Department of Chemistry, University of Bath, Claverton Down, BA2 7AY Bath, UK
- Dynamic Reaction Monitoring Facility, University of Bath, Claverton Down, BA2 7AY Bath, UK
| | - John P. Lowe
- Department of Chemistry, University of Bath, Claverton Down, BA2 7AY Bath, UK
- Dynamic Reaction Monitoring Facility, University of Bath, Claverton Down, BA2 7AY Bath, UK
| | - Ulrich Hintermair
- Department of Chemistry, University of Bath, Claverton Down, BA2 7AY Bath, UK
- Dynamic Reaction Monitoring Facility, University of Bath, Claverton Down, BA2 7AY Bath, UK
- Centre for Sustainable and Circular Technologies, University of Bath, Claverton Down, BA2 7AY Bath, UK
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6
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Holtrop F, Jupp AR, Kooij BJ, van Leest NP, de Bruin B, Slootweg JC. Single-Electron Transfer in Frustrated Lewis Pair Chemistry. Angew Chem Int Ed Engl 2020; 59:22210-22216. [PMID: 32840947 PMCID: PMC7756365 DOI: 10.1002/anie.202009717] [Citation(s) in RCA: 37] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Indexed: 02/05/2023]
Abstract
Frustrated Lewis pairs (FLPs) are well known for their ability to activate small molecules. Recent reports of radical formation within such systems indicate single-electron transfer (SET) could play an important role in their chemistry. Herein, we investigate radical formation upon reacting FLP systems with dihydrogen, triphenyltin hydride, or tetrachloro-1,4-benzoquinone (TCQ) both experimentally and computationally to determine the nature of the single-electron transfer (SET) events; that is, being direct SET to B(C6 F5 )3 or not. The reactions of H2 and Ph3 SnH with archetypal P/B FLP systems do not proceed via a radical mechanism. In contrast, reaction with TCQ proceeds via SET, which is only feasible by Lewis acid coordination to the substrate. Furthermore, SET from the Lewis base to the Lewis acid-substrate adduct may be prevalent in other reported examples of radical FLP chemistry, which provides important design principles for radical main-group chemistry.
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Affiliation(s)
- Flip Holtrop
- Van't Hoff Institute for Molecular SciencesUniversity of AmsterdamPO Box 941571090 GDAmsterdamThe Netherlands
| | - Andrew R. Jupp
- Van't Hoff Institute for Molecular SciencesUniversity of AmsterdamPO Box 941571090 GDAmsterdamThe Netherlands
| | - Bastiaan J. Kooij
- Van't Hoff Institute for Molecular SciencesUniversity of AmsterdamPO Box 941571090 GDAmsterdamThe Netherlands
| | - Nicolaas P. van Leest
- Van't Hoff Institute for Molecular SciencesUniversity of AmsterdamPO Box 941571090 GDAmsterdamThe Netherlands
| | - Bas de Bruin
- Van't Hoff Institute for Molecular SciencesUniversity of AmsterdamPO Box 941571090 GDAmsterdamThe Netherlands
| | - J. Chris Slootweg
- Van't Hoff Institute for Molecular SciencesUniversity of AmsterdamPO Box 941571090 GDAmsterdamThe Netherlands
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7
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Holtrop F, Jupp AR, Kooij BJ, Leest NP, Bruin B, Slootweg JC. Single‐Electron Transfer in Frustrated Lewis Pair Chemistry. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202009717] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Flip Holtrop
- Van't Hoff Institute for Molecular Sciences University of Amsterdam PO Box 94157 1090 GD Amsterdam The Netherlands
| | - Andrew R. Jupp
- Van't Hoff Institute for Molecular Sciences University of Amsterdam PO Box 94157 1090 GD Amsterdam The Netherlands
| | - Bastiaan J. Kooij
- Van't Hoff Institute for Molecular Sciences University of Amsterdam PO Box 94157 1090 GD Amsterdam The Netherlands
| | - Nicolaas P. Leest
- Van't Hoff Institute for Molecular Sciences University of Amsterdam PO Box 94157 1090 GD Amsterdam The Netherlands
| | - Bas Bruin
- Van't Hoff Institute for Molecular Sciences University of Amsterdam PO Box 94157 1090 GD Amsterdam The Netherlands
| | - J. Chris Slootweg
- Van't Hoff Institute for Molecular Sciences University of Amsterdam PO Box 94157 1090 GD Amsterdam The Netherlands
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8
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Miyamoto N, Ikeda Y, Tsukahara T. Multinuclear NMR Studies on Lewis Acid-Lewis Base Interactions between Bis(pentafluorophenyl)borinic Acid and Uranyl β-Diketonato Complexes in Toluene. Inorg Chem 2020; 59:11347-11356. [PMID: 32799480 DOI: 10.1021/acs.inorgchem.0c00979] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
In order to examine the possibility of Lewis acid-Lewis base (LA-LB) interactions between the boron atom of B(C6F5)2OH and the oxo groups ("yl" oxygen atoms) of uranyl β-diketonato complexes, we have measured the 1H, 11B, 17O, 19F NMR and IR spectra of toluene solutions containing β-diketonato complexes [UO2(acac)2DMSO or UO2(dfh)2DMSO, where acac = 2,4-pentanedionate, dfh = 1,1,1,2,2,6,6,7,7,7-decafluoroheptane-3,5-dionate, and DMSO = dimethyl sulfoxide] and B(C6F5)2OH. 11B and 17O NMR spectra of solutions containing UO2(dfh)2DMSO and B(C6F5)2OH showed no change in their chemical shifts regardless of the [B(C6F5)2OH]/[UO2(dfh)2DMSO] ratio. This indicates that there were no apparent interactions between B(C6F5)2OH and UO2(dfh)2DMSO. On the other hand, in the corresponding NMR spectra of solutions containing UO2(acac)2DMSO and B(C6F5)2OH, new signals were observed at a higher field than signals observed in the solutions containing only B(C6F5)2OH or UO2(acac)2DMSO, and their intensity changed with the [B(C6F5)2OH]/[UO2(acac)2DMSO] ratio. These results reveal that a complex with LA-LB interaction (B···O═U) between the boron atom of B(C6F5)2OH and the "yl" oxygen atom of UO2(acac)2DMSO was formed. IR spectra also supported such complex formation; i.e., the asymmetric O═U═O stretching band of UO2(acac)2DMSO was observed to shift from 897 to 810 cm-1 with the addition of B(C6F5)2OH. Moreover, 19F NMR spectra indicated that 1:1 and 2:1 LA-LB complexes exist in equilibrium, UO{OB(C6F5)2OH}(acac)2DMSO + B(C6F5)2OH = U{OB(C6F5)2OH}2(acac)2DMSO. The thermodynamic parameters for this equilibrium were obtained as K = (2.5 ± 0.6) × 102 M-1 (at 25 °C), ΔH = -42.4 ± 5.2 kJ mol-1, and ΔS = -96.7 ± 19.4 J K-1 mol-1. In 1H NMR spectra, the signal due to -CH groups of UO2(acac)2DMSO disappeared, and three signals due to the corresponding -CH groups newly appeared with an increase in the [B(C6F5)2OH]/[UO2(acac)2DMSO] ratio. From these phenomena, it is proposed that 1:1 and 2:1 LA-LB complexes having interactions between the -CH groups of acac and the -OH group of coordinated B(C6F5)2OH are formed depending on the [B(C6F5)2OH]/[UO2(acac)2DMSO] ratio.
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Affiliation(s)
- Naomi Miyamoto
- Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1-N1-6 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Yasuhisa Ikeda
- Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1-N1-6 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
| | - Takehiko Tsukahara
- Laboratory for Advanced Nuclear Energy, Institute of Innovative Research, Tokyo Institute of Technology, 2-12-1-N1-6 Ookayama, Meguro-ku, Tokyo 152-8550, Japan
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9
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Swisher NA, Grubbs RH. Synthesis and Characterization of 3,5-Bis(di- tert-butylphosphinito)pyridine Pincer Complexes. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00270] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Nicholas A. Swisher
- Arnold and Mabel Beckman Laboratory for Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, United States
| | - Robert H. Grubbs
- Arnold and Mabel Beckman Laboratory for Chemical Synthesis, California Institute of Technology, Pasadena, California 91125, United States
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10
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Diether D, Meermann-Zimmermann M, Törnroos KW, Maichle-Mössmer C, Anwander R. Rare-earth metal-promoted (double) C–H-bond activation of a lutidinyl-functionalized alkoxy ligand: formation of [ONC] pincer-type ligands and implications for isoprene polymerization. Dalton Trans 2020; 49:2004-2013. [DOI: 10.1039/c9dt04742e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Steric pressure enforces the formation of dianionic and trianionic pincer-type ligands involving a rare alkylidene moiety in the latter case.
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Affiliation(s)
- Dominic Diether
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- Germany
| | - Melanie Meermann-Zimmermann
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- Germany
- Department of Chemistry
- University of Bergen
| | | | | | - Reiner Anwander
- Institut für Anorganische Chemie
- Eberhard Karls Universität Tübingen
- Germany
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11
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Zaccaria F, Sian L, Zuccaccia C, Macchioni A. Ion pairing in transition metal catalyzed olefin polymerization. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2020. [DOI: 10.1016/bs.adomc.2019.08.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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12
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Fischer M, Schmidtmann M. B(C 6F 5) 3- and HB(C 6F 5) 2-mediated transformations of isothiocyanates. Chem Commun (Camb) 2020; 56:6205-6208. [PMID: 32364554 DOI: 10.1039/d0cc02626c] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
This contribution reports on the reactivity of isothiocyanates towards the boranes B(C6F5)3 and HB(C6F5)2. The reactions of alkyl-substituted isothiocyanates with B(C6F5)3 were found to result in rearrangement reactions to yield stable thiocyanate-B(C6F5)3 adducts. Treatment of isothiocyanates with HB(C6F5)2 leads to 1,2-hydroboration and thus, B,N,C,S heterocycles are formed, which react further under non-inert conditions. Hydrolysis of the hydroboration products leads to a new access to thioformamides.
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Affiliation(s)
- Malte Fischer
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky Straße 9-11, D-26129 Oldenburg, Germany.
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University Oldenburg, Carl von Ossietzky Straße 9-11, D-26129 Oldenburg, Germany.
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13
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Guru MM, Thorve PR, Maji B. Boron-Catalyzed N-Alkylation of Arylamines and Arylamides with Benzylic Alcohols. J Org Chem 2019; 85:806-819. [PMID: 31804079 DOI: 10.1021/acs.joc.9b02816] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
A sustainable boron-based catalytic approach for chemoselective N-alkylation of primary and secondary aromatic amines and amides with primary, secondary, and tertiary benzylic alcohols has been presented. The metal-free protocol operates at low catalyst loading, tolerates several functional groups, and generates H2O as the sole byproduct. Preliminary mechanistic studies were performed to demonstrate the crucial role of boron catalyst for the activation of the intermediate dibenzyl ether and to identify the rate-determining step.
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Affiliation(s)
- Murali Mohan Guru
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur 741246 , India
| | - Pradip Ramdas Thorve
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur 741246 , India
| | - Biplab Maji
- Department of Chemical Sciences , Indian Institute of Science Education and Research Kolkata , Mohanpur 741246 , India
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14
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Künzler S, Rathjen S, Merk A, Schmidtmann M, Müller T. An Experimental Acidity Scale for Intramolecularly Stabilized Silyl Lewis Acids. Chemistry 2019; 25:15123-15130. [PMID: 31469201 PMCID: PMC6899571 DOI: 10.1002/chem.201903241] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Indexed: 01/15/2023]
Abstract
A new NMR-based Lewis acidity scale is suggested and its application is demonstrated for a family of silyl Lewis acids. The reaction of p-fluorobenzonitrile (FBN) with silyl cations that are internally stabilized by interaction with a remote chalcogenyl or halogen donor yields silylated nitrilium ions with the silicon atom in a trigonal bipyramidal coordination environment. The 19 F NMR chemical shifts and the 1 J(CF) coupling constants of these nitrilium ions vary in a predictable manner with the donor capability of the stabilizing group. The spectroscopic parameters are suitable probes for scaling the acidity of Lewis acids. These new probes allow for the discrimination between very similar Lewis acids, which is not possible with conventional NMR tests, such as the well-established Gutmann-Beckett method.
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Affiliation(s)
- Sandra Künzler
- Carl von Ossietzky Universität OldenburgCarl von Ossietzky-Str. 9–1126129OldenburgGermany, European Union
| | - Saskia Rathjen
- Carl von Ossietzky Universität OldenburgCarl von Ossietzky-Str. 9–1126129OldenburgGermany, European Union
| | - Anastasia Merk
- Carl von Ossietzky Universität OldenburgCarl von Ossietzky-Str. 9–1126129OldenburgGermany, European Union
| | - Marc Schmidtmann
- Carl von Ossietzky Universität OldenburgCarl von Ossietzky-Str. 9–1126129OldenburgGermany, European Union
| | - Thomas Müller
- Carl von Ossietzky Universität OldenburgCarl von Ossietzky-Str. 9–1126129OldenburgGermany, European Union
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15
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Baraniak MK, Lalancette RA, Jäkle F. Electron‐Deficient Borinic Acid Polymers: Synthesis, Supramolecular Assembly, and Examination as Catalysts in Amide Bond Formation. Chemistry 2019; 25:13799-13810. [DOI: 10.1002/chem.201903196] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2019] [Revised: 08/10/2019] [Indexed: 12/19/2022]
Affiliation(s)
- Monika K. Baraniak
- Department of ChemistryRutgers University-Newark 73 Warren Street Newark NJ 07102 USA
| | - Roger A. Lalancette
- Department of ChemistryRutgers University-Newark 73 Warren Street Newark NJ 07102 USA
| | - Frieder Jäkle
- Department of ChemistryRutgers University-Newark 73 Warren Street Newark NJ 07102 USA
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16
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Correa SA, Daniliuc CG, Stark HS, Rojas RS. Nickel Catalysts Activated by rGO Modified with a Boron Lewis Acid To Produce rGO-Hyperbranched PE Nanocomposites. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00397] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sebastián A. Correa
- Laboratorio de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Santiago-22 6094411, Chile
| | - Constantin G. Daniliuc
- Organisch-Chemisches Institut, Westfälische Wilhelm-Universität, D-48149 Münster, Germany
| | - H. Sophia Stark
- Department of Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraβe 4, D-85747 Garching, Germany
| | - René S. Rojas
- Laboratorio de Química Inorgánica, Facultad de Química, Pontificia Universidad Católica de Chile, Casilla 306, Santiago-22 6094411, Chile
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17
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Fischer M, Barbul D, Schmidtmann M, Beckhaus R. Unexpected Selective Methyl Group Abstractions from SiMe
3
Moieties of CH
2
SiMe
3
Ligands To Give New Cationic Titanium Complexes. Chemistry 2019; 25:7119-7130. [DOI: 10.1002/chem.201900599] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Malte Fischer
- Institut für ChemieFakultät für Mathematik und NaturwissenschaftenCarl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Daniel Barbul
- Institut für ChemieFakultät für Mathematik und NaturwissenschaftenCarl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für ChemieFakultät für Mathematik und NaturwissenschaftenCarl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
| | - Ruediger Beckhaus
- Institut für ChemieFakultät für Mathematik und NaturwissenschaftenCarl von Ossietzky Universität Oldenburg Postfach 2503 26111 Oldenburg Germany
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18
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Fischer M, Schmidtmann M, Beckhaus R. To Coordinate or not to Coordinate: The Special Role of Chalcogen Ether Functionalities in the Design of Twofold Functionalized Cyclopentadienyl Ligands [Cp,O,Ch
(Ch
= S, Se)]. Z Anorg Allg Chem 2019. [DOI: 10.1002/zaac.201900012] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Malte Fischer
- Institut für Chemie; Fakultät für Mathematik und Naturwissenschaften; Carl von Ossietzky Universität Oldenburg; 26111 Oldenburg Germany
| | - Marc Schmidtmann
- Institut für Chemie; Fakultät für Mathematik und Naturwissenschaften; Carl von Ossietzky Universität Oldenburg; 26111 Oldenburg Germany
| | - Ruediger Beckhaus
- Institut für Chemie; Fakultät für Mathematik und Naturwissenschaften; Carl von Ossietzky Universität Oldenburg; 26111 Oldenburg Germany
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19
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Fischer M, Schwitalla K, Baues S, Schmidtmann M, Beckhaus R. FLP behaviour of cationic titanium complexes with tridentate Cp,O,N-ligands: highly efficient syntheses and activation reactions of C–X bonds (X = Cl, F). Dalton Trans 2019; 48:1516-1523. [DOI: 10.1039/c8dt04707c] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Titanium FLPs! Solvent- and catalyst-free Aza-Michael reaction provides β-amino ketones which were employed as ligand precursors for the convenient synthesis of novel cationic titanium complexes with tridentate Cp,O,N-ligand frameworks, which activate C–X bonds in a FLP-like manner.
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Affiliation(s)
- Malte Fischer
- Institut fuer Chemie
- Fakultaet für Mathematik und Naturwissenschaften
- Carl von Ossietzky Universitaet Oldenburg
- 26111 Oldenburg
- Germany
| | - Kevin Schwitalla
- Institut fuer Chemie
- Fakultaet für Mathematik und Naturwissenschaften
- Carl von Ossietzky Universitaet Oldenburg
- 26111 Oldenburg
- Germany
| | - Svenja Baues
- Institut fuer Chemie
- Fakultaet für Mathematik und Naturwissenschaften
- Carl von Ossietzky Universitaet Oldenburg
- 26111 Oldenburg
- Germany
| | - Marc Schmidtmann
- Institut fuer Chemie
- Fakultaet für Mathematik und Naturwissenschaften
- Carl von Ossietzky Universitaet Oldenburg
- 26111 Oldenburg
- Germany
| | - Ruediger Beckhaus
- Institut fuer Chemie
- Fakultaet für Mathematik und Naturwissenschaften
- Carl von Ossietzky Universitaet Oldenburg
- 26111 Oldenburg
- Germany
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20
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Dong Z, Cramer HH, Schmidtmann M, Paul LA, Siewert I, Müller T. Evidence for a Single Electron Shift in a Lewis Acid–Base Reaction. J Am Chem Soc 2018; 140:15419-15424. [DOI: 10.1021/jacs.8b09214] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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, European Union
| | - Hanna H. Cramer
- Institute of Chemistry, Carl von Ossietzky University of Oldenburg, Carl von Ossietzky-Str. 9-11, D-26129 Oldenburg, Federal Republic of Germany, European Union
| | - Marc Schmidtmann
- Institute of Chemistry, Carl von Ossietzky University of Oldenburg, Carl von Ossietzky-Str. 9-11, D-26129 Oldenburg, Federal Republic of Germany, European Union
| | - Lucas A. Paul
- Institute of Inorganic Chemistry, Göttingen University, Tammannstr. 4, D-37077 Göttingen, Federal Republic of Germany, European Union
| | - Inke Siewert
- Institute of Inorganic Chemistry, Göttingen University, Tammannstr. 4, D-37077 Göttingen, Federal Republic of Germany, European Union
| | - Thomas Müller
- Institute of Chemistry, Carl von Ossietzky University of Oldenburg, Carl von Ossietzky-Str. 9-11, D-26129 Oldenburg, Federal Republic of Germany, European Union
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21
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Chen L, Liu R, Yan Q. Polymer Meets Frustrated Lewis Pair: Second-Generation CO2
-Responsive Nanosystem for Sustainable CO2
Conversion. Angew Chem Int Ed Engl 2018; 57:9336-9340. [DOI: 10.1002/anie.201804034] [Citation(s) in RCA: 66] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Indexed: 01/14/2023]
Affiliation(s)
- Liang Chen
- State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science; Fudan University; Shanghai 200433 China
| | - Renjie Liu
- State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science; Fudan University; Shanghai 200433 China
| | - Qiang Yan
- State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science; Fudan University; Shanghai 200433 China
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22
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Chen L, Liu R, Yan Q. Polymer Meets Frustrated Lewis Pair: Second-Generation CO2
-Responsive Nanosystem for Sustainable CO2
Conversion. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804034] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Liang Chen
- State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science; Fudan University; Shanghai 200433 China
| | - Renjie Liu
- State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science; Fudan University; Shanghai 200433 China
| | - Qiang Yan
- State Key Laboratory of Molecular Engineering of Polymers; Department of Macromolecular Science; Fudan University; Shanghai 200433 China
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23
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Li W, Wang MM, Hu Y, Werner T. B(C 6F 5) 3-Catalyzed Regioselective Deuteration of Electron-Rich Aromatic and Heteroaromatic Compounds. Org Lett 2018; 19:5768-5771. [PMID: 29052995 DOI: 10.1021/acs.orglett.7b02701] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Deuterium labeled compounds find widespread application in life science. Herein, the deuteration of electron-rich (hetero)aromatic compounds employing B(C6F5)3 as the catalyst and D2O as the deuterium source is reported. This protocol is highly efficient, simply manipulated, and successfully applied in the deuteration of 23 substrates including natural neurotransmitter-like melatonin. It is assumed that the weakening of the O-D bond ultimately results in the formation of electrophilic D+.
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Affiliation(s)
- Wu Li
- Leibniz Institute for Catalysis at the University of Rostock , Albert-Einstein-Straße 29a, 18059 Rostock, Germany
| | - Ming-Ming Wang
- Leibniz Institute for Catalysis at the University of Rostock , Albert-Einstein-Straße 29a, 18059 Rostock, Germany
| | - Yuya Hu
- Leibniz Institute for Catalysis at the University of Rostock , Albert-Einstein-Straße 29a, 18059 Rostock, Germany
| | - Thomas Werner
- Leibniz Institute for Catalysis at the University of Rostock , Albert-Einstein-Straße 29a, 18059 Rostock, Germany
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24
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Wang S, Chen SY, Yu XQ. C-H functionalization by high-valent Cp*Co(iii) catalysis. Chem Commun (Camb) 2018; 53:3165-3180. [PMID: 28261721 DOI: 10.1039/c6cc09651d] [Citation(s) in RCA: 190] [Impact Index Per Article: 31.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Significant progress has been accomplished in directed C-H functionalization through the use of earth-abundant and inexpensive first-row transition metals. Among these base metals, Co is especially attractive in view of its versatile applications in C-H functionalization, in both low- and high-valent states. In this vein, catalytic Co(iii) species can be generated from the dissociation of a Cp*Co(iii) catalyst or through the oxidation of a low-valent cobalt catalyst in the presence of an oxidant. In this feature article, we will discuss the breakthroughs in Cp*Co(iii)-promoted C-H functionalization. In this field, C(sp2)-H functionalization has been extensively studied and developed. In contrast, few C(sp3)-H functionalization reactions have been reported.
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Affiliation(s)
- Shan Wang
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P. R. China.
| | - Shan-Yong Chen
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P. R. China.
| | - Xiao-Qi Yu
- Key Laboratory of Green Chemistry and Technology, Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, P. R. China.
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25
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Gozdalik JT, Adamczyk-Woźniak A, Sporzyński A. Influence of fluorine substituents on the properties of phenylboronic compounds. PURE APPL CHEM 2017. [DOI: 10.1515/pac-2017-1009] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Abstract
Rapid development of research on the chemistry of boronic acids is connected with their applications in organic synthesis, analytical chemistry, materials’ chemistry, biology and medicine. In many applications Lewis acidity of boron atoms plays an important role. Special group of arylboronic acids are fluoro-substituted compounds, in which the electron withdrawing character of fluorine atoms influences their properties. The present paper deals with fluoro-substituted boronic acids and their derivatives: esters, benzoxaboroles and boroxines. Properties of these compounds, i.e. acidity, hydrolytic stability, structures in crystals and in solution as well as spectroscopic properties are discussed. In the next part examples of important applications are given.
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Affiliation(s)
- Jan T. Gozdalik
- Faculty of Chemistry, Warsaw University of Technology , Noakowskiego 3 , 00-664 Warsaw , Poland
| | | | - Andrzej Sporzyński
- Faculty of Chemistry, Warsaw University of Technology , Noakowskiego 3 , 00-664 Warsaw , Poland
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26
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Summerscales OT, Moore CM, Scott BL, Wilkerson MP, Sutton AD. Cerium(III) Carbonate Formation from {CeCp*2H}2 and Carbon Dioxide: Structure and Mechanistic Insights. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00639] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Owen T. Summerscales
- Chemistry Division and ‡Materials and Physics Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Cameron M. Moore
- Chemistry Division and ‡Materials and Physics Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Brian L. Scott
- Chemistry Division and ‡Materials and Physics Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Marianne P. Wilkerson
- Chemistry Division and ‡Materials and Physics Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
| | - Andrew D. Sutton
- Chemistry Division and ‡Materials and Physics Applications Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, United States
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27
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Zhang J, Park S, Chang S. Selective C−O Bond Cleavage of Sugars with Hydrosilanes Catalyzed by Piers’ Borane Generated In Situ. Angew Chem Int Ed Engl 2017; 56:13757-13761. [DOI: 10.1002/anie.201708109] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Revised: 08/29/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Jianbo Zhang
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Sehoon Park
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon Functionalizations; Institute for Basic Science (IBS); Daejeon 305-701 South Korea
- Department of Chemistry; Korea Advanced Institute of Science & Technology (KAIST); Daejeon 305-701 South Korea
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28
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Selective C−O Bond Cleavage of Sugars with Hydrosilanes Catalyzed by Piers’ Borane Generated In Situ. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201708109] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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29
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Drover MW, Bowes EG, Love JA, Schafer LL. Accessing δ-B–H Coordinated Complexes of Rh(I) and Ir(I) Using Mono- and Dihydroboranes: Cooperative Stabilization by a Phosphoramidate Coligand. Organometallics 2016. [DOI: 10.1021/acs.organomet.6b00784] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marcus W. Drover
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Eric G. Bowes
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Jennifer A. Love
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Laurel L. Schafer
- Department of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
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30
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Pyziak J, Walkowiak J, Marciniec B. Recent Advances in Boron-Substituted 1,3-Dienes Chemistry: Synthesis and Application. Chemistry 2016; 23:3502-3541. [DOI: 10.1002/chem.201602124] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2016] [Indexed: 12/25/2022]
Affiliation(s)
- Jadwiga Pyziak
- Centre for Advanced Technologies; Adam Mickiewicz University in Poznań; Umultowska 89c 61-614 Poznań Poland
| | - Jędrzej Walkowiak
- Centre for Advanced Technologies; Adam Mickiewicz University in Poznań; Umultowska 89c 61-614 Poznań Poland
| | - Bogdan Marciniec
- Centre for Advanced Technologies; Adam Mickiewicz University in Poznań; Umultowska 89c 61-614 Poznań Poland
- Faculty of Chemistry; Adam Mickiewicz University in Poznań; Umultowska 89c 61-614 Poznań Poland
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31
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Kim JH, Greßies S, Glorius F. Cooperative Lewis Acid/Cp*Co
III
Catalyzed C−H Bond Activation for the Synthesis of Isoquinolin‐3‐ones. Angew Chem Int Ed Engl 2016; 55:5577-81. [DOI: 10.1002/anie.201601003] [Citation(s) in RCA: 170] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Indexed: 01/08/2023]
Affiliation(s)
- Ju Hyun Kim
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstrasse 40 48149 Münster Germany
| | - Steffen Greßies
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstrasse 40 48149 Münster Germany
| | - Frank Glorius
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstrasse 40 48149 Münster Germany
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32
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Kim JH, Greßies S, Glorius F. Kooperative Lewis‐Säure/Cp*Co
III
‐katalysierte C‐H‐Bindungsaktivierung zur Synthese von Isochinolin‐3‐onen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201601003] [Citation(s) in RCA: 59] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ju Hyun Kim
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Deutschland
| | - Steffen Greßies
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Deutschland
| | - Frank Glorius
- Organisch-Chemisches Institut Westfälische Wilhelms-Universität Münster Corrensstraße 40 48149 Münster Deutschland
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33
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Körte LA, Blomeyer S, Heidemeyer S, Nissen JH, Mix A, Neumann B, Stammler HG, Mitzel NW. Intramolecular Lewis pairs with two acid sites – reactivity differences between P- and N-based systems. Dalton Trans 2016; 45:17319-17328. [DOI: 10.1039/c6dt03490j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Unlike the aniline PhN[(CH2)3B(C6F5)2]2 the doubly hydroborated species (tBu/Ph)P[(CH2)3B(C6F5)2]2 show no dynamic exchange of the boron Lewis acid functions in solution and are not catalytically active in terms of H/D-scrambling as well as hydrogenation reactions.
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Affiliation(s)
- Leif A. Körte
- Anorganische Chemie und Strukturchemie
- Centrum für molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
| | - Sebastian Blomeyer
- Anorganische Chemie und Strukturchemie
- Centrum für molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
| | - Shari Heidemeyer
- Anorganische Chemie und Strukturchemie
- Centrum für molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
| | - Jan Hendrick Nissen
- Anorganische Chemie und Strukturchemie
- Centrum für molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
| | - Andreas Mix
- Anorganische Chemie und Strukturchemie
- Centrum für molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
| | - Beate Neumann
- Anorganische Chemie und Strukturchemie
- Centrum für molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
| | - Hans-Georg Stammler
- Anorganische Chemie und Strukturchemie
- Centrum für molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
| | - Norbert W. Mitzel
- Anorganische Chemie und Strukturchemie
- Centrum für molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
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34
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Chen GQ, Türkyilmaz F, Daniliuc CG, Bannwarth C, Grimme S, Kehr G, Erker G. Enamine/butadienylborane cycloaddition in the frustrated Lewis pair regime. Org Biomol Chem 2015; 13:10477-86. [PMID: 26330093 DOI: 10.1039/c5ob01602a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The dienylborane 2a was prepared by regioselective alkyne hydroboration of the conjugated enyne 1a with Piers' borane [HB(C6F5)2]. Its reaction with a series of acetophenone derived enamines 3 resulted in the formation of the strong enamine β-carbon adduct with the borane Lewis acid (4). In contrast B-C adduct formation between the dienylborane 2a and a series of much more bulky cyclohexanone derived enamines (6) is rapidly reversible above ca.-30 °C and then leads to the formation of the [4 + 2]cycloaddition products 8. A DFT study revealed that this reaction is probably taking a stepwise route, proceeding by means of enamine addition to the dienylborane terminus to generate a zwitterionic borata-alkene/iminium ion intermediate that undergoes rapid subsequent ring closure. Heating of the products 8 led to amidoborane elimination from the vicinal amino/borane pair at the product framework to give the respective hexahydronaphthalene product 10. Subsequent treatment with TEMPO (2 equiv.) resulted in selective oxidation of the unsaturated ring to give the respective tetrahydronaphthalene derivative 12.
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Affiliation(s)
- Guo-Qiang Chen
- Organisch-Chemisches Institut, Universität Münster, Corrensstraβe 40, 48149 Münster, Germany.
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35
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Ge F, Türkyilmaz F, Daniliuc CG, Siedow M, Eckert H, Kehr G, Erker G. A 1,1-Carboboration Route to Bora-Nazarov Systems. Chem Asian J 2015. [PMID: 26223464 DOI: 10.1002/asia.201500636] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Hydroboration of the conjugated enynes 1 a and 1 b with Piers' borane [HB(C6F5)2] gave the respective dienylboranes trans-2 c and trans-2 d. Their photolysis resulted in the formation of the dihydroborole products 3 c and 3 d. Both were converted to their pyridine adducts 5 c and 5 d, respectively. Compounds 3 c and 5 c,d were characterized by X-ray diffraction. The reaction of the bis(enynyl)boranes 6 a and 6 b with B(C6F5)3 resulted in the formation of the dihydroboroles 7 a and 7 b, respectively. This reaction is thought to proceed by 1,1-carboboration of one of the enynyl substituents at boron to generate the dienylborane intermediates 8 a/8 b, followed by thermally induced bora-Nazarov ring-closure and subsequent stabilizing 1,2-pentafluorophenyl group migration from boron to carbon. Compound 7 a was characterized by X-ray diffraction and solid-state (11)B NMR spectroscopy.
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Affiliation(s)
- Fang Ge
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149, Münster, Germany
| | - Fatma Türkyilmaz
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149, Münster, Germany
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149, Münster, Germany
| | - Melanie Siedow
- Institut für Physikalische Chemie, Universität Münster, Corrensstraße 30, 48149, Münster, Germany
| | - Hellmut Eckert
- Institut für Physikalische Chemie, Universität Münster, Corrensstraße 30, 48149, Münster, Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149, Münster, Germany
| | - Gerhard Erker
- Organisch-Chemisches Institut, Universität Münster, Corrensstrasse 40, 48149, Münster, Germany.
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36
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Chen GQ, Kehr G, Daniliuc CG, Erker G. 1,1-Alkenylboration of diarylphosphino-enynes: convenient synthetic entry to vicinal P/B Lewis pairs at extended conjugated π-frameworks. Org Biomol Chem 2015; 13:764-9. [DOI: 10.1039/c4ob02134g] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Alkenylboranes R-CHCH-B(C6F5)2 undergo carbon–carbon coupling by means of 1,1-alkenylboration with diarylphosphino-enynes to give conjugated hexatriene derivatives that bear a vicinal pair of B(C6F5)2 and PAr2 functionalities at the framework.
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Affiliation(s)
- Guo-Qiang Chen
- Organisch-Chemisches Institut
- Universität Münster
- Münster
- Germany
| | - Gerald Kehr
- Organisch-Chemisches Institut
- Universität Münster
- Münster
- Germany
| | | | - Gerhard Erker
- Organisch-Chemisches Institut
- Universität Münster
- Münster
- Germany
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37
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Körte LA, Warner R, Vishnevskiy YV, Neumann B, Stammler HG, Mitzel NW. Intramolecular pyridine-based frustrated Lewis-pairs. Dalton Trans 2015; 44:9992-10002. [DOI: 10.1039/c5dt01068c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Besides a series of pyridine-based Lewis pairs with B(C6F5)2 groups with varying electronic and steric situations and strong intramolecular B–N bonds, 2-[(CH2)4B(C6F5)2]-6-tBu-pyridine was found to behave as a frustrated Lewis pair.
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Affiliation(s)
- Leif A. Körte
- Bielefeld University
- Faculty of Chemistry
- Chair of Inorganic and Structural Chemistry
- Centre for Molecular Materials CM2
- 33615 Bielefeld
| | - Robin Warner
- Bielefeld University
- Faculty of Chemistry
- Chair of Inorganic and Structural Chemistry
- Centre for Molecular Materials CM2
- 33615 Bielefeld
| | - Yury V. Vishnevskiy
- Bielefeld University
- Faculty of Chemistry
- Chair of Inorganic and Structural Chemistry
- Centre for Molecular Materials CM2
- 33615 Bielefeld
| | - Beate Neumann
- Bielefeld University
- Faculty of Chemistry
- Chair of Inorganic and Structural Chemistry
- Centre for Molecular Materials CM2
- 33615 Bielefeld
| | - Hans-Georg Stammler
- Bielefeld University
- Faculty of Chemistry
- Chair of Inorganic and Structural Chemistry
- Centre for Molecular Materials CM2
- 33615 Bielefeld
| | - Norbert W. Mitzel
- Bielefeld University
- Faculty of Chemistry
- Chair of Inorganic and Structural Chemistry
- Centre for Molecular Materials CM2
- 33615 Bielefeld
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38
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Frömel S, Radermacher G, Wibbeling B, Daniliuc CG, Warren TH, Kehr G, Erker G. P/B Ketene Adduct Formation from Acyl Chlorides at a Vicinal Phosphane/Borane Frustrated Lewis Pair. Isr J Chem 2014. [DOI: 10.1002/ijch.201400133] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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40
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Melen RL. Applications of pentafluorophenyl boron reagents in the synthesis of heterocyclic and aromatic compounds. Chem Commun (Camb) 2014; 50:1161-74. [PMID: 24292326 DOI: 10.1039/c3cc48036d] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Recently, main group reagents have attracted a lot of attention in bond-forming reactions in organic synthesis. This article highlights the use of pentafluorophenyl substituted boron reagents in their reactions with C=C and C≡C π-bonds for the synthesis of heterocyclic and aromatic compounds. These cyclisation reactions fall into four general classes although there is some overlap between classes and often combinations of these different types of reactivity are observed in the formation of the final heterocyclic product: (i) 1,2- (and 1,4-) additions of nucleophile and Lewis-acidic boron centre, (ii) 1,1-carboboration, (iii) carbocation rearrangements and (iv) cycloaddition chemistry. In addition, the prospect of using such boron reagents catalytically in the synthesis of aromatic compounds such as oxazoles and dibenzopentalene derivatives is emphasised.
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Affiliation(s)
- Rebecca L Melen
- Department of Chemistry, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada.
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41
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Winkelhaus D, Stephan DW. Boron Perturbed Click Reactions Prompt Aromatic CH Activations. Angew Chem Int Ed Engl 2014; 53:5414-7. [DOI: 10.1002/anie.201402567] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2014] [Indexed: 11/09/2022]
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42
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Winkelhaus D, Stephan DW. Boron Perturbed Click Reactions Prompt Aromatic CH Activations. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/ange.201402567] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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43
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Wrackmeyer B, Thoma P, Marx S, Bauer T, Kempe R. Selective Synthesis of Stannoles by 1,1‐Carboboration of Bis(trimethylsilylethynyl)tin Compounds Using Weakly and Strongly Electrophilic Triorganoboranes: Characterization of a Zwitterionic Intermediate. Eur J Inorg Chem 2014. [DOI: 10.1002/ejic.201400028] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bernd Wrackmeyer
- Anorganische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany, http://www.ac2.uni‐bayreuth.de/catalyst‐design.php
| | - Peter Thoma
- Anorganische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany, http://www.ac2.uni‐bayreuth.de/catalyst‐design.php
| | - Simone Marx
- Anorganische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany, http://www.ac2.uni‐bayreuth.de/catalyst‐design.php
| | - Tobias Bauer
- Anorganische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany, http://www.ac2.uni‐bayreuth.de/catalyst‐design.php
| | - Rhett Kempe
- Anorganische Chemie II, Universität Bayreuth, 95440 Bayreuth, Germany, http://www.ac2.uni‐bayreuth.de/catalyst‐design.php
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44
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Mohr J, Durmaz M, Irran E, Oestreich M. Tris(5,6,7,8-tetrafluoronaphthalen-2-yl)borane, a Partially Fluorinated Boron Lewis Acid with Fluorination Distal to the Boron Atom. Organometallics 2014. [DOI: 10.1021/om500128a] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jens Mohr
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623 Berlin, Germany
| | - Mustafa Durmaz
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623 Berlin, Germany
| | - Elisabeth Irran
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623 Berlin, Germany
| | - Martin Oestreich
- Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623 Berlin, Germany
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45
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Hansmann MM, Melen RL, Rominger F, Hashmi ASK, Stephan DW. Activation of alkynes with B(C₆F₅)₃--boron allylation reagents derived from propargyl esters. J Am Chem Soc 2014; 136:777-82. [PMID: 24354408 DOI: 10.1021/ja4110842] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Novel allyl boron compounds are readily synthesized via rearrangement reactions between Lewis acidic B(C6F5)3 and propargyl esters. These reactions proceed through an initial cyclization followed by ring-opening and concurrent C6F5-group migration. In the absence of disubstitution adjacent to the ester oxygen atom, an allyl boron migration rearrangement leads to formal 1,3-carboboration products. These allyl boron compounds act as allylation reagents with aldehydes introducing both a C3-allyl fragment and a C6F5-unit as a single anti-diastereomer. In these reactions, B(C6F5)3 activates the alkynes, prompting the rearrangement processes and enabling installations of C6F5 and R-groups.
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Affiliation(s)
- Max M Hansmann
- Organisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg , Im Neuenheimer Feld 270, 69120 Heidelberg, Germany
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46
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Sattler W, Ruccolo S, Parkin G. Synthesis, Structure, and Reactivity of a Terminal Organozinc Fluoride Compound: Hydrogen Bonding, Halogen Bonding, and Donor–Acceptor Interactions. J Am Chem Soc 2013; 135:18714-7. [DOI: 10.1021/ja408733f] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Wesley Sattler
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
| | - Serge Ruccolo
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
| | - Gerard Parkin
- Department
of Chemistry, Columbia University, New York, New York 10027, United States
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47
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Sakata K, Fujimoto H. Quantum Chemical Study of B(C6F5)3-Catalyzed Hydrosilylation of Carbonyl Group. J Org Chem 2013; 78:12505-12. [DOI: 10.1021/jo402195x] [Citation(s) in RCA: 121] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Ken Sakata
- Faculty
of Pharmaceutical Sciences, Hoshi University, Ebara, Shinagawa-ku, Tokyo 142-8501, Japan
| | - Hiroshi Fujimoto
- Department
of Molecular Engineering, Graduate School
of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto 615-8510, Japan
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Liberman-Martin AL, Bergman RG, Tilley TD. A remote Lewis acid trigger dramatically accelerates biaryl reductive elimination from a platinum complex. J Am Chem Soc 2013; 135:9612-5. [PMID: 23789917 DOI: 10.1021/ja404339u] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A strategy for the control of electron density at a metal center is reported, which uses a remote chemical switch involving second-sphere Lewis acid binding that modulates electron density in the first coordination sphere. Binding of the Lewis acid B(C6F5)3 at remote nitrogen positions of a bipyrazine-diarylplatinum(II) complex accelerates biaryl reductive elimination by a factor of 64,000.
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50
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Thilagar P, Murillo D, Chen J, Jäkle F. Synthesis and supramolecular assembly of the bifunctional borinic acid [1,2-fcB(OH)]2. Dalton Trans 2013; 42:665-70. [DOI: 10.1039/c2dt31625k] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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