51
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Kinder TA, Pior R, Blomeyer S, Neumann B, Stammler H, Mitzel NW. A Neutral Germanium/Phosphorus Frustrated Lewis Pair and Its Contrasting Reactivity Compared to Its Silicon Analogue. Chemistry 2019; 25:5899-5903. [PMID: 30843630 DOI: 10.1002/chem.201901068] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2019] [Indexed: 11/06/2022]
Affiliation(s)
- Timo A. Kinder
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für, Molekulare Materialien CM2Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - René Pior
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für, Molekulare Materialien CM2Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Sebastian Blomeyer
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für, Molekulare Materialien CM2Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Beate Neumann
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für, Molekulare Materialien CM2Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Hans‐Georg Stammler
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für, Molekulare Materialien CM2Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
| | - Norbert W. Mitzel
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für, Molekulare Materialien CM2Universität Bielefeld Universitätsstraße 25 33615 Bielefeld Germany
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52
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Holtkamp P, Friedrich F, Stratmann E, Mix A, Neumann B, Stammler H, Mitzel NW. Ein neutrales geminales frustriertes Zinn/Phosphor‐Lewis‐Paar. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201901037] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Philipp Holtkamp
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für Molekulare Materialien CM2Fakultät für ChemieUniversität Bielefeld Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Felix Friedrich
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für Molekulare Materialien CM2Fakultät für ChemieUniversität Bielefeld Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Erik Stratmann
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für Molekulare Materialien CM2Fakultät für ChemieUniversität Bielefeld Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Andreas Mix
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für Molekulare Materialien CM2Fakultät für ChemieUniversität Bielefeld Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Beate Neumann
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für Molekulare Materialien CM2Fakultät für ChemieUniversität Bielefeld Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Hans‐Georg Stammler
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für Molekulare Materialien CM2Fakultät für ChemieUniversität Bielefeld Universitätsstraße 25 33615 Bielefeld Deutschland
| | - Norbert W. Mitzel
- Lehrstuhl für Anorganische Chemie und Strukturchemie und Centrum für Molekulare Materialien CM2Fakultät für ChemieUniversität Bielefeld Universitätsstraße 25 33615 Bielefeld Deutschland
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53
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Ma G, Song G, Li ZH. Designing Metal-Free Frustrated Lewis Pairs Catalyst for the Efficient Dehydrogenation of Ammonia Borane. Chemistry 2018; 24:13238-13245. [PMID: 29938854 DOI: 10.1002/chem.201801932] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2018] [Revised: 06/13/2018] [Indexed: 01/08/2023]
Abstract
Ammonia borane (AB) has been in the spotlight for the chemical storage of hydrogen over the past decade. However, the development of methods for efficient and controlled hydrogen release from AB under mild conditions is still underway. Herein, using density functional theory (DFT) computations, we designed a metal-free frustrated Lewis pair (FLP) catalyst o-(BPh2 )C6 H4 (NiPr2 ) (M1) that can efficiently dehydrogenate AB to release more than two equivalents of H2 under mild conditions. Catalyst M1 can dehydrogenate not only AB to H2 N=BH2 (AOB) and H2 , but also oligomers of AOB with rather low free-energy barriers. The high dehydrogenation activity of M1 is the key of new oligomerization routes to the efficient dehydrogenation of AB to borazine (BZ) or H2 B-(NH=BH)n -NH2 (PIB) and finally to polyborazylene (PBZ) so that more than two equivalents of H2 can be released. A first-principle kinetic Monte Carlo (KMC) study reveals that the activity of our catalytic system can be tuned by varying the initial concentration of M1 and AB. This work can guide the design of catalyst for the highly efficient utilization of AB as a hydrogen storage material.
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Affiliation(s)
- Gongli Ma
- Collaborative Innovation Center of Chemistry for Energy Material, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, P.R. China
| | - Guoliang Song
- Collaborative Innovation Center of Chemistry for Energy Material, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, P.R. China
| | - Zhen Hua Li
- Collaborative Innovation Center of Chemistry for Energy Material, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 200438, Shanghai, P.R. China
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54
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Norbert W. Mitzel. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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55
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Norbert W. Mitzel. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/anie.201712874] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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56
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Jian Z, Kehr G, Daniliuc CG, Wibbeling B, Erker G. A hydroboration route to geminal P/B frustrated Lewis pairs with a bulky secondary phosphane component and their reaction with carbon dioxide. Dalton Trans 2018; 46:11715-11721. [PMID: 28828440 DOI: 10.1039/c7dt02315d] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The secondary aryl-P(H) phosphanyl substituted tert-butylacetylenes 7a,b (aryl: Mes or Mes*) undergo hydroboration with [HB(C6F5)2] to give the geminal vinylidene-bridged P/B Lewis pairs 8a,b. The treatment of 8a,b with benzonitrile, N-sulfinylaniline, and phenyl isothiocyanate, respectively, gives the addition products 12a,b, 13a,b, and 14 with proton transfer from the phosphorus to the more basic nitrogen site. The reaction of the FLPs 8a,b with carbon dioxide yields a doubly boron bonded addition product. The reaction of 8b with a conjugated ynone formally proceeded by trans-1,2-hydrophosphination of the alkyne at the geminal FLP framework to give the seven-membered heterocycle 21.
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Affiliation(s)
- Zhongbao Jian
- Organisch-Chemisches Institut, Universität Münster, Corrensstr. 40, 48149 Münster, Germany.
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57
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Maskey R, Schädler M, Legler C, Greb L. Bis(perchlorocatecholato)silane-A Neutral Silicon Lewis Super Acid. Angew Chem Int Ed Engl 2018; 57:1717-1720. [PMID: 29240282 DOI: 10.1002/anie.201712155] [Citation(s) in RCA: 76] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2017] [Indexed: 01/26/2023]
Abstract
No neutral silicon Lewis super acids are known to date. We report on the synthesis of bis(perchlorocatecholato)silane and verify its Lewis super acidity by computation (DLPNO-CCSD(T)) and experiment (fluoride abstraction from SbF6- ). The exceptional affinity towards donors is further demonstrated by, for example, the characterization of an unprecedented SiO4 F2 dianion and applied in the first hydrodefluorination reaction catalyzed by a neutral silicon Lewis acid. Given the strength and convenient access to this new Lewis acid, versatile applications might be foreseen.
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Affiliation(s)
- Rezisha Maskey
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Marcel Schädler
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Claudia Legler
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
| | - Lutz Greb
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 270, 69120, Heidelberg, Germany
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58
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Maskey R, Schädler M, Legler C, Greb L. Bis(perchlorocatecholato)silan - eine neutrale Silicium-Lewis-Supersäure. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712155] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Rezisha Maskey
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
| | - Marcel Schädler
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
| | - Claudia Legler
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
| | - Lutz Greb
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Deutschland
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59
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Noroozi-Shad N, Gholizadeh M, Izadyar M, Eshghi H. Theoretical Evaluation of the Efficiency of Novel Frustrated Lewis Pairs in the cis-Hydrogenation Reaction of Dimethylacetylene. PROGRESS IN REACTION KINETICS AND MECHANISM 2017. [DOI: 10.3184/146867817x14954764850469] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
Frustrated Lewis pairs (FLPs) are the combination of Lewis acid and base motifs where steric hindrance prevents strong adduct formation. Accordingly, the ability of FLPs in small molecule activation and their capability in hydrogen cleavage led to their use in the hydrogenation of a wide range of unsaturated substrates. Here, we investigated theoretically the ability of three intramolecular phosphorus/boron FLPs as bifunctional catalysts in the metal-free hydrogenation of dimethylacetylene to cis-alkene. The mechanism of this hydrogenation reaction, based on the boron acceptor [including –OR substituents (B(OR)2), where R is an aliphatic or aromatic branch] and phosphorus donor, has been explored. Based on the results obtained, it was confirmed that the H2 splitting reaction and the formation of the phosphonium–borohydride motifs for these FLPs are endothermic. It has been shown that these FLPs have a moderate ability in H–H bond splitting. Also, the capability of the boron atom in FLPs on the hydrogenation reaction was investigated. The reduction steps of the mechanism showed an exothermic nature. This result revealed that the presence of the boron as a Lewis acid, with a very limited Lewis acidity, improves the catalytic hydrogenation reaction significantly. Finally, it was confirmed that the proposed FLPs in the cis-hydrogenation of alkynes will be effective.
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Affiliation(s)
- Nazanin Noroozi-Shad
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mostafa Gholizadeh
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mohammad Izadyar
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Hossein Eshghi
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad, Mashhad, Iran
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60
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Kramer N, Jöst C, Mackenroth A, Greb L. Synthesis of Electron-Rich, Planarized Silicon(IV) Species and a Theoretical Analysis of Dimerizing Aminosilanes. Chemistry 2017; 23:17764-17774. [DOI: 10.1002/chem.201703649] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Indexed: 12/31/2022]
Affiliation(s)
- Nina Kramer
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Christoph Jöst
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Alexandra Mackenroth
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Lutz Greb
- Anorganisch-Chemisches Institut; Ruprecht-Karls-Universität Heidelberg; Im Neuenheimer Feld 270 69120 Heidelberg Germany
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61
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Devillard M, de Bruin B, Siegler MA, van der Vlugt JI. Transition-Metal-Free Cleavage of CO. Chemistry 2017; 23:13628-13632. [PMID: 28816371 PMCID: PMC5656908 DOI: 10.1002/chem.201703798] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Indexed: 11/20/2022]
Abstract
Tertiary silane 1H , 2-[(diphenylsilyl)methyl]-6-methylpyridine, reacts with tris(pentafluorophenyl)borane (BCF) to form the intramolecular pyridine-stabilized silylium 1+ -HBCF. The corresponding 2-[(diphenylsilyl)methyl]pyridine, lacking the methyl-group on the pyridine ring, forms classic N(py)→B adduct 2H -BCF featuring an intact silane Si-H fragment. Complex 1+ -HBCF promotes cleavage of the C≡O triple bond in carbon monoxide with double C-Csp2 bond formation, leading to complex 3 featuring a B-(diarylmethyl)-B-aryl-boryloxysilane fragment. Reaction with pinacol generates bis(pentafluorophenyl)methane 4 as isolable product, proving the transition-metal-free deoxygenation of carbon monoxide by this main-group system. Experimental data and DFT calculations support the existence of an equilibrium between the silylium-hydroborate ion pair and the silane-borane mixture that is responsible for the observed reactivity.
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Affiliation(s)
- Marc Devillard
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
| | - Bas de Bruin
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
| | - Maxime A. Siegler
- Small Molecule X-ray CrystallographyJohn Hopkins University3400 N Charles StBaltimoreMD21218USA
| | - J. I. van der Vlugt
- van ‘t Hoff Institute for Molecular SciencesUniversity of AmsterdamScience Park 9041098 XHAmsterdamThe Netherlands
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62
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Kordts N, Künzler S, Rathjen S, Sieling T, Großekappenberg H, Schmidtmann M, Müller T. Silyl Chalconium Ions: Synthesis, Structure and Application in Hydrodefluorination Reactions. Chemistry 2017; 23:10068-10079. [DOI: 10.1002/chem.201700995] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Natalie Kordts
- Institute of Chemistry; Carl von Ossietzky University Oldenburg; Carl von Ossietzky Str. 9-11 26211 Oldenburg Germany
| | - Sandra Künzler
- Institute of Chemistry; Carl von Ossietzky University Oldenburg; Carl von Ossietzky Str. 9-11 26211 Oldenburg Germany
| | - Saskia Rathjen
- Institute of Chemistry; Carl von Ossietzky University Oldenburg; Carl von Ossietzky Str. 9-11 26211 Oldenburg Germany
| | - Thorben Sieling
- Institute of Chemistry; Carl von Ossietzky University Oldenburg; Carl von Ossietzky Str. 9-11 26211 Oldenburg Germany
| | - Henning Großekappenberg
- Institute of Chemistry; Carl von Ossietzky University Oldenburg; Carl von Ossietzky Str. 9-11 26211 Oldenburg Germany
| | - Marc Schmidtmann
- Institute of Chemistry; Carl von Ossietzky University Oldenburg; Carl von Ossietzky Str. 9-11 26211 Oldenburg Germany
| | - Thomas Müller
- Institute of Chemistry; Carl von Ossietzky University Oldenburg; Carl von Ossietzky Str. 9-11 26211 Oldenburg Germany
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63
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Dong Z, Li Z, Liu X, Yan C, Wei N, Kira M, Müller T. Dihydrogen Splitting Using Dialkylsilylene-Based Frustrated Lewis Pairs. Chem Asian J 2017; 12:1204-1207. [DOI: 10.1002/asia.201700143] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Zhaowen Dong
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; No. 2318 Yuhangtang Rd. Hangzhou 311121 Zhejiang China
- Institute of Chemistry; Carl von Ossietzky Universität Oldenburg; Carl-von-Ossietzky-Str. 9-11 26129 Oldenburg Germany
| | - Zhifang Li
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; No. 2318 Yuhangtang Rd. Hangzhou 311121 Zhejiang China
| | - Xupeng Liu
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; No. 2318 Yuhangtang Rd. Hangzhou 311121 Zhejiang China
| | - Chenting Yan
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; No. 2318 Yuhangtang Rd. Hangzhou 311121 Zhejiang China
| | - Ningka Wei
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; No. 2318 Yuhangtang Rd. Hangzhou 311121 Zhejiang China
| | - Mitsuo Kira
- Key Laboratory of Organosilicon Chemistry and Material Technology of Ministry of Education; Hangzhou Normal University; No. 2318 Yuhangtang Rd. Hangzhou 311121 Zhejiang China
| | - Thomas Müller
- Institute of Chemistry; Carl von Ossietzky Universität Oldenburg; Carl-von-Ossietzky-Str. 9-11 26129 Oldenburg Germany
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64
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Nzahou Ottou W, Conde-Mendizabal E, Pascual A, Wirotius AL, Bourichon D, Vignolle J, Robert F, Landais Y, Sotiropoulos JM, Miqueu K, Taton D. Organic Lewis Pairs Based on Phosphine and Electrophilic Silane for the Direct and Controlled Polymerization of Methyl Methacrylate: Experimental and Theoretical Investigations. Macromolecules 2017. [DOI: 10.1021/acs.macromol.6b02205] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Winnie Nzahou Ottou
- Université
de Bordeaux, LCPO, UMR 5629, F-33600 Pessac, France
- CNRS, LCPO, UMR 5629, F-33600 Pessac, France
| | - Egoitz Conde-Mendizabal
- Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux, Université de PAU & des Pays de l’Adour, CNRS, UNIV PAU & PAYS ADOUR, IPREM UMR 5254, 64000 PAU, France
| | - Ana Pascual
- Université
de Bordeaux, LCPO, UMR 5629, F-33600 Pessac, France
- CNRS, LCPO, UMR 5629, F-33600 Pessac, France
| | - Anne-Laure Wirotius
- Université
de Bordeaux, LCPO, UMR 5629, F-33600 Pessac, France
- CNRS, LCPO, UMR 5629, F-33600 Pessac, France
| | - Damien Bourichon
- Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux, Université de PAU & des Pays de l’Adour, CNRS, UNIV PAU & PAYS ADOUR, IPREM UMR 5254, 64000 PAU, France
| | - Joan Vignolle
- Université
de Bordeaux, LCPO, UMR 5629, F-33600 Pessac, France
- CNRS, LCPO, UMR 5629, F-33600 Pessac, France
| | - Frédéric Robert
- Université
de Bordeaux, ISM, UMR 5255, 33400 Talence, France
- CNRS, ISM, UMR 5255, 33400 Talence, France
| | - Yannick Landais
- Université
de Bordeaux, ISM, UMR 5255, 33400 Talence, France
- CNRS, ISM, UMR 5255, 33400 Talence, France
| | - Jean-Marc Sotiropoulos
- Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux, Université de PAU & des Pays de l’Adour, CNRS, UNIV PAU & PAYS ADOUR, IPREM UMR 5254, 64000 PAU, France
| | - Karinne Miqueu
- Institut des Sciences Analytiques et de Physico-Chimie pour l’Environnement et les Matériaux, Université de PAU & des Pays de l’Adour, CNRS, UNIV PAU & PAYS ADOUR, IPREM UMR 5254, 64000 PAU, France
| | - Daniel Taton
- Université
de Bordeaux, LCPO, UMR 5629, F-33600 Pessac, France
- CNRS, LCPO, UMR 5629, F-33600 Pessac, France
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65
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Habraken ERM, Mens LC, Nieger M, Lutz M, Ehlers AW, Slootweg JC. Reactivity of the geminal phosphinoborane tBu2PCH2BPh2 towards alkynes, nitriles, and nitrilium triflates. Dalton Trans 2017; 46:12284-12292. [DOI: 10.1039/c7dt02570j] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
The reactivity of the geminal phosphinoborane tBu2PCH2BPh2 towards terminal alkynes, nitriles and nitrilium salts is investigated.
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Affiliation(s)
- Evi R. M. Habraken
- Van ‘t Hoff Institute for Molecular Sciences
- University of Amsterdam
- 1090 GD Amsterdam
- The Netherlands
| | - Lars C. Mens
- Van ‘t Hoff Institute for Molecular Sciences
- University of Amsterdam
- 1090 GD Amsterdam
- The Netherlands
| | - Martin Nieger
- Department of Chemistry
- University of Helsinki
- Helsinki
- Finland
| | - Martin Lutz
- Crystal and Structural Chemistry
- Bijvoet Center for Biomolecular Research
- Utrecht University
- 3584 CH Utrecht
- The Netherlands
| | - Andreas W. Ehlers
- Van ‘t Hoff Institute for Molecular Sciences
- University of Amsterdam
- 1090 GD Amsterdam
- The Netherlands
- Department of Chemistry
| | - J. Chris Slootweg
- Van ‘t Hoff Institute for Molecular Sciences
- University of Amsterdam
- 1090 GD Amsterdam
- The Netherlands
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66
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Sato K, Tan TTY, Schäfers F, Hahn FE, Stephan DW. Imidazole-stabilized, electron-deficient boron cations. Dalton Trans 2017; 46:16404-16407. [DOI: 10.1039/c7dt04030j] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly Lewis acidic borenium cations were prepared and are shown to activate H2 and effect 1,1-carborations of alkynes.
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Affiliation(s)
- Kaoko Sato
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
- Department of chemistry
| | - Tristan Tsai Yuan Tan
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - Felix Schäfers
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
| | - F. Ekkehardt Hahn
- Institut für Anorganische und Analytische Chemie
- Westfälische Wilhelms-Universität Münster
- D-48149 Münster
- Germany
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67
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Wilkins LC, Günther BAR, Walther M, Lawson JR, Wirth T, Melen RL. Contrasting Frustrated Lewis Pair Reactivity with Selenium- and Boron-Based Lewis Acids. Angew Chem Int Ed Engl 2016; 55:11292-5. [PMID: 27484052 PMCID: PMC5113806 DOI: 10.1002/anie.201605239] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2016] [Indexed: 01/11/2023]
Abstract
The activation of π-bonds in diynyl esters has been investigated by using soft and hard Lewis acids. In the case of the soft selenium Lewis acid PhSeCl, sequential activation of the alkyne bonds leads initially to an isocoumarin (1 equiv PhSeCl) and then to a tetracyclic conjugated structure with the isocoumarin subunit fused to a benzoselenopyran (3 equiv PhSeCl). Conversely, the reaction with the hard Lewis acidic borane B(C6 F5 )3 initiates a cascade reaction to yield a complex π-conjugated system containing phthalide and indene subunits.
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Affiliation(s)
- Lewis C Wilkins
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Cymru/Wales, CF10 3AT, UK
| | - Benjamin A R Günther
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Cymru/Wales, CF10 3AT, UK
| | - Melanie Walther
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Cymru/Wales, CF10 3AT, UK
| | - James R Lawson
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Cymru/Wales, CF10 3AT, UK
| | - Thomas Wirth
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Cymru/Wales, CF10 3AT, UK
| | - Rebecca L Melen
- School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff, Cymru/Wales, CF10 3AT, UK.
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68
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Blagg RJ, Simmons TR, Hatton GR, Courtney JM, Bennett EL, Lawrence EJ, Wildgoose GG. Novel B(Ar')2(Ar'') hetero-tri(aryl)boranes: a systematic study of Lewis acidity. Dalton Trans 2016; 45:6032-43. [PMID: 26541517 DOI: 10.1039/c5dt03854e] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A series of homo- and hetero-tri(aryl)boranes incorporating pentafluorophenyl, 3,5-bis(trifluoromethyl)phenyl, and pentachlorophenyl groups, four of which are novel species, have been studied as the acidic component of frustrated Lewis pairs for the heterolytic cleavage of H2. Under mild conditions eight of these will cleave H2; the rate of cleavage depending on both the electrophilicity of the borane and the steric bulk around the boron atom. Electrochemical studies allow comparisons of the electrophilicity with spectroscopic measurements of Lewis acidity for different series of boranes. Discrepancies in the correlation between these two types of measurements, combined with structural characterisation of each borane, reveal that the twist of the aryl rings with respect to the boron-centred trigonal plane is significant from both a steric and electronic perspective, and is an important consideration in the design of tri(aryl)boranes as Lewis acids.
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Affiliation(s)
- Robin J Blagg
- School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK.
| | - Trevor R Simmons
- School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK.
| | - Georgina R Hatton
- School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK.
| | - James M Courtney
- School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK.
| | - Elliot L Bennett
- School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK.
| | - Elliot J Lawrence
- School of Chemistry, University of East Anglia, Norwich, NR4 7TJ, UK.
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69
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Körte LA, Blomeyer S, Heidemeyer S, Mix A, Neumann B, Mitzel NW. Intramolecular cooperativity in frustrated Lewis pairs. Chem Commun (Camb) 2016; 52:9949-52. [DOI: 10.1039/c6cc05228b] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The doubly Lewis-acid functionalised aniline PhN[(CH2)3B(C6F5)2]2 features two competing boron functions in fast exchange for binding to the central Lewis base. In contrast to the mono acid-functionalised PhMeN[(CH2)3B(C6F5)2], it is an active frustrated Lewis pair.
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Affiliation(s)
- Leif A. Körte
- Lehrstuhl für Anorganische Chemie und Strukturchemie and Centrum für Molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
- Germany
| | - Sebastian Blomeyer
- Lehrstuhl für Anorganische Chemie und Strukturchemie and Centrum für Molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
- Germany
| | - Shari Heidemeyer
- Lehrstuhl für Anorganische Chemie und Strukturchemie and Centrum für Molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
- Germany
| | - Andreas Mix
- Lehrstuhl für Anorganische Chemie und Strukturchemie and Centrum für Molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
- Germany
| | - Beate Neumann
- Lehrstuhl für Anorganische Chemie und Strukturchemie and Centrum für Molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
- Germany
| | - Norbert W. Mitzel
- Lehrstuhl für Anorganische Chemie und Strukturchemie and Centrum für Molekulare Materialien CM2
- Fakultät für Chemie
- Universität Bielefeld
- 33615 Bielefeld
- Germany
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70
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Zhivonitko VV, Sorochkina K, Chernichenko K, Kótai B, Földes T, Pápai I, Telkki VV, Repo T, Koptyug I. Nuclear spin hyperpolarization with ansa-aminoboranes: a metal-free perspective for parahydrogen-induced polarization. Phys Chem Chem Phys 2016; 18:27784-27795. [DOI: 10.1039/c6cp05211h] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A series of new ansa-aminoboranes was analyzed experimentally and theoretically for metal-free production of parahydrogen-induced polarization.
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Affiliation(s)
- Vladimir V. Zhivonitko
- Laboratory of Magnetic Resonance Microimaging
- International Tomography Center SB RAS
- 630090 Novosibirsk
- Russia
- Department of Natural Sciences
| | | | | | - Bianka Kótai
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1117 Budapest
- Hungary
| | - Tamás Földes
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1117 Budapest
- Hungary
| | - Imre Pápai
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1117 Budapest
- Hungary
| | | | - Timo Repo
- Department of Chemistry
- University of Helsinki
- 00014 Helsinki
- Finland
| | - Igor Koptyug
- Laboratory of Magnetic Resonance Microimaging
- International Tomography Center SB RAS
- 630090 Novosibirsk
- Russia
- Department of Natural Sciences
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