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Reactions of Dihaloboranes with Electron-Rich 1,4-Bis(trimethylsilyl)-1,4-diaza-2,5-cyclohexadienes. Molecules 2020; 25:molecules25122875. [PMID: 32580464 PMCID: PMC7356994 DOI: 10.3390/molecules25122875] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2020] [Revised: 06/14/2020] [Accepted: 06/16/2020] [Indexed: 11/16/2022] Open
Abstract
The reactions of electron-rich organosilicon compounds 1,4-bis(trimethylsilyl)-1,4-diaza-2,5-cyclohexadiene (1), 2,3,5,6-tetramethyl-1,4-bis(trimethylsilyl)-1,4-diaza-2,5-cyclohexadiene (2), and 1,1'-bis(trimethylsilyl)-1,1'-dihydro-4,4'-bipyridine (12) with B-amino and B-aryl dihaloboranes afforded a series of novel B=N-bond-containing compounds 3-11 and 13. The B=N rotational barriers of 7 (>71.56 kJ/mol), 10 (58.79 kJ/mol), and 13 (58.65 kJ/mol) were determined by variable-temperature 1H-NMR spectroscopy, thus reflecting different degrees of B=N double bond character in the corresponding compounds. In addition, ring external olefin isomers 11 were obtained by a reaction between 2 and DurBBr2. All obtained B=N-containing products were characterized by multinuclear NMR spectroscopy. Compounds 5, 9, 10a, 11, and 13a were also characterized by single-crystal X-ray diffraction analysis.
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Ordyszewska A, Szynkiewicz N, Perzanowski E, Chojnacki J, Wiśniewska A, Grubba R. Structural and spectroscopic analysis of a new family of monomeric diphosphinoboranes. Dalton Trans 2019; 48:12482-12495. [PMID: 31361287 DOI: 10.1039/c9dt02195g] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We present a series of amino- and aryl(diphosphino)boranes R2PB(R'')PR'2, where R2P, R'2P = tBu2P, tBuPhP, Ph2P, Cy2P, and R'' = iPr2N, Ph, which were obtained via the metathesis reaction of iPr2NBBr2 or PhBBr2 with selected lithium phosphides. The structures of isolated diphosphinoboranes were characterized in the solid state and in solution by means of X-ray diffraction and NMR spectroscopy, respectively. The utility of these P-B-P species as ligands for transition metal complexes was tested in the reaction with [(COD)PtMe2]. Moreover, we carried out DFT calculations to elucidate bonding interactions and philicity of the reactive centers as well as to analyze conformations of the studied species. Electronic and steric properties of substituents on P and B atoms were found to have a strong influence on the structures of the obtained compounds. Three main types of diphosphinoboranes were distinguished, based on the strength of P-B π-interaction within the molecule: (i) application of strong electron-donating substituents on P-atoms and electron-accepting phenyl groups on B atoms led to the structure with one double P[double bond, length as m-dash]B and one single P-B bond and diverse planar and pyramidal geometry of phosphanyl groups; (ii) reduction of the donor ability of phosphanyl groups gave diphosphanylboranes with delocalized P-B-P π-interactions; (iii) introduction of amino groups with strong donor abilities on B atoms canceled P-B π-interactions and allowed compounds with two very long P-B bonds and two pyramidal phosphanyl groups to be obtained.
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Affiliation(s)
- Anna Ordyszewska
- Department of Inorganic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, G. Narutowicza St. 11/12, PL-80-233, Gdansk, Poland.
| | - Natalia Szynkiewicz
- Department of Inorganic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, G. Narutowicza St. 11/12, PL-80-233, Gdansk, Poland.
| | - Emil Perzanowski
- Department of Inorganic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, G. Narutowicza St. 11/12, PL-80-233, Gdansk, Poland.
| | - Jarosław Chojnacki
- Department of Inorganic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, G. Narutowicza St. 11/12, PL-80-233, Gdansk, Poland.
| | - Aleksandra Wiśniewska
- Department of Inorganic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, G. Narutowicza St. 11/12, PL-80-233, Gdansk, Poland.
| | - Rafał Grubba
- Department of Inorganic Chemistry, Faculty of Chemistry, Gdańsk University of Technology, G. Narutowicza St. 11/12, PL-80-233, Gdansk, Poland.
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Bellham P, Hill MS, Kociok-Köhn G, Liptrot DJ. Alkaline earth alkyl insertion chemistry of in situ generated aminoboranes. Dalton Trans 2013; 42:737-45. [DOI: 10.1039/c2dt31849k] [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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Braunschweig H, Ye Q, Damme A, Kupfer T, Radacki K, Wolf J. Synthesis of 1-Aza-2-borabutatriene Rhodium Complexes by Thermal Borylene Transfer from [(OC)5MoBN(SiMe3)2]. Angew Chem Int Ed Engl 2011; 50:9462-6. [DOI: 10.1002/anie.201104026] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2011] [Indexed: 11/08/2022]
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Braunschweig H, Ye Q, Damme A, Kupfer T, Radacki K, Wolf J. Synthese von 1-Aza-2-borabutatrien-Rhodiumkomplexen durch thermischen Borylentransfer von [(OC)5MoBN(SiMe3)2]. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201104026] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Braunschweig H, Herbst T, Rais D, Ghosh S, Kupfer T, Radacki K, Crawford AG, Ward RM, Marder TB, Fernández I, Frenking G. Borylene-Based Direct Functionalization of Organic Substrates: Synthesis, Characterization, and Photophysical Properties of Novel π-Conjugated Borirenes. J Am Chem Soc 2009; 131:8989-99. [DOI: 10.1021/ja902198z] [Citation(s) in RCA: 78] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | | | | | | | | | | | | | | | | | - Israel Fernández
- Dpto. Química Orgánica I, Universidad Complutense de Madrid, 28040 Madrid, Spain
| | - Gernot Frenking
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Strasse, 35043 Marburg, Germany
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Braunschweig H, Ye Q, Radacki K. Borylene-based functionalization of Pt–alkynyl complexes by photochemical borylene transfer from [(OC)5CrBN(SiMe3)2]. Chem Commun (Camb) 2009:6979-81. [DOI: 10.1039/b915926f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Bieller S, Bolte M, Lerner HW, Wagner M. Modular Approach to Tridentate N,O,N′ Ligands Using Pyrazolylborate Chemistry. Chemistry 2006; 12:4735-42. [PMID: 16710866 DOI: 10.1002/chem.200600142] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Two anionic tridentate N,O,N' chelators, [pz(Ph)B(mu-pz)(mu-O)B(Ph)pz](-) (3(-)) and [pz(Ph)(Ph)B(mu-pz)(mu-O)B(Ph)pz(Ph)](-) (4(-)), as well as the corresponding complexes [Fe(3)(py)Cl], [Fe(3)Cl(2)] and [Cu(3)Cl], have been synthesised and structurally characterised by X-ray crystallography (pz: pyrazolyl, pz(Ph): 3-phenylpyrazolyl, py: pyridine). Since our synthesis approach takes advantage of the highly modular pyrazolylborate chemistry, inexpensive and relatively resistant N,O,N' ligands of varying steric demand are readily accessible. The complexes [Fe(3)(py)Cl] and [Fe(3)Cl(2)] possess a distorted trigonal-bipyramidal configuration with the pyrazolyl rings occupying equatorial positions and the oxygen donor being located at an apical position. The complex [Cu(3)Cl] crystallises as chloro-bridged dimers featuring Cu(II) ions with ligand environments that are intermediate between a square-planar and a trigonal-bipyramidal geometry.
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Affiliation(s)
- Susanne Bieller
- Institut für Anorganische Chemie, Johann Wolfgang Goethe-Universität Frankfurt am Main, Max-von-Laue-Strasse 7, 60438 Frankfurt, Germany
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Ashe AJ, Fang X, Kampf JW. 1,3-Thiaborolide: A New Heteroaromatic Surrogate for Cyclopentadienide. Organometallics 1999. [DOI: 10.1021/om990110i] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Arthur J. Ashe
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055
| | - Xinggao Fang
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055
| | - Jeff W. Kampf
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055
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Affiliation(s)
- Arthur J. Ashe
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055
| | - Xinggao Fang
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055
| | - Jeff W. Kampf
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055
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Minyaev RM, Wales DJ, Walsh TR. Gradient Line Reaction Paths for Hindered Internal Rotation in H2BNH2 and Inversion in PF3. J Phys Chem A 1997. [DOI: 10.1021/jp9628343] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ruslan M. Minyaev
- Institute of Physical and Organic Chemistry, Rostov State University, 194/2 Stachka Avenue, Rostov-on-Don 344090, Russian Federation, and University of Cambridge, University Chemical Laboratories, Lensfield Road, Cambridge CB2 1EW, U.K
| | - David J. Wales
- Institute of Physical and Organic Chemistry, Rostov State University, 194/2 Stachka Avenue, Rostov-on-Don 344090, Russian Federation, and University of Cambridge, University Chemical Laboratories, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Tiffany R. Walsh
- Institute of Physical and Organic Chemistry, Rostov State University, 194/2 Stachka Avenue, Rostov-on-Don 344090, Russian Federation, and University of Cambridge, University Chemical Laboratories, Lensfield Road, Cambridge CB2 1EW, U.K
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Ashe AJ, Kampf JW, Müller C, Schneider M. Aminoboratabenzenes. An Evaluation of the Exocyclic B−N Interaction. Organometallics 1996. [DOI: 10.1021/om9506330] [Citation(s) in RCA: 50] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Arthur J. Ashe
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055
| | - Jeff W. Kampf
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055
| | - Christian Müller
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055
| | - Manuela Schneider
- Department of Chemistry, The University of Michigan, Ann Arbor, Michigan 48109-1055
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Glaser B, Nöth H. Beiträge zur Chemie des Bors, 179. Synthese, Konformation und Molekülstruktur sterisch anspruchsvoller Aminomethylenboran-Vorstufen. ACTA ACUST UNITED AC 1986. [DOI: 10.1002/cber.19861191107] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Restricted rotation about the BN bond in aminoboranes: the determination of activation parameters using 13C NMR. J Organomet Chem 1985. [DOI: 10.1016/0022-328x(85)80375-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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