1
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Kundu G, Amrutha PR, Tothadi S, Sen SS. Access to NHC-Boryl Mono- and Bis-Selenide and Utility as Mild Selenium Transfer Reagent Including to the C-F Bond. Chemistry 2024; 30:e202302984. [PMID: 37943498 DOI: 10.1002/chem.202302984] [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: 09/14/2023] [Revised: 11/09/2023] [Accepted: 11/09/2023] [Indexed: 11/10/2023]
Abstract
Reactions of 5-SIDipp ⋅ BH3 (5-SIDipp=1,3-bis(2,6-diisopropylphenyl)-imidazolin-2-ylidene) (1) with diphenyldiselenide provide access to 5-SIDipp-boryl mono- (5-SIDipp ⋅ BH2 SePh) (2) and bis-selenide (5-SIDipp ⋅ BH(SePh)2 ) (3). The facile cleavage of the B-Se bond makes 2 a neutral source of selenium nucleophiles in substitutions reactions with benzyl bromides, and provide access to the corresponding selenoethers. The direct transformations of one of the C(sp2 )-F bonds of C5 F5 N and C6 F5 CF3 to C-Se bonds have also been achieved by the use of 2 without employing transition-metal catalysts. While it was previously established that C6 F6 could undergo complete defluoroselenation under harsh conditions, we successfully achieved partial defluorination of C6 F6 by employing 2 as a mild selenide transfer reagent. During the formation of C-Se bonds through the cleavage of C-F bonds, the potential by-product NHC ⋅ BH2 F undergoes ring expansion of the NHC, leading to the formation of the six-membered diaazafluoroborinane (7).
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Affiliation(s)
- Gargi Kundu
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, 411008, Pashan, Pune, India
- Academy of Scientific and Innovative Research (AcSIR), 201002, Ghaziabad, India
| | - P R Amrutha
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, 411008, Pashan, Pune, India
- Academy of Scientific and Innovative Research (AcSIR), 201002, Ghaziabad, India
| | - Srinu Tothadi
- Academy of Scientific and Innovative Research (AcSIR), 201002, Ghaziabad, India
- Analytical and Environmental Sciences Division and Centralized Instrumentation Facility, CSIR-Central Salt and Marine Chemicals Research Institute, Gijubhai Badheka Marg, 364002, Bhavnagar, India
| | - Sakya S Sen
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, 411008, Pashan, Pune, India
- Academy of Scientific and Innovative Research (AcSIR), 201002, Ghaziabad, India
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2
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Kundu G, Ajithkumar VS, Raj KV, Vanka K, Tothadi S, Sen SS. Substitution at sp 3 boron of a six-membered NHC·BH 3: convenient access to a dihydroxyborenium cation. Chem Commun (Camb) 2022; 58:3783-3786. [PMID: 35229841 DOI: 10.1039/d1cc06816d] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we have undertaken the synthesis and investigated the reactivity of a 6-membered saturated NHC borane adduct (1). Direct electrophilic halogenation of 1 with a stoichiometric amount of I2 led to NHC boryl iodides, 6-SIDipp·BH2I (2) and 6-SIDipp·BHI2 (3), which were further reacted with various nucleophiles to give novel 6-SIDipp based mono and disubstituted boranes with OTf (4 and 6) or ONO2 (5 and 7) functional groups. The addition of Br2/H2O to 1 smoothly results in a dihydroxyborenium cation (8).
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Affiliation(s)
- Gargi Kundu
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune 411008, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - V S Ajithkumar
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune 411008, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - K Vipin Raj
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India.,Physical and Material Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
| | - Kumar Vanka
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India.,Physical and Material Chemistry Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
| | - Srinu Tothadi
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India.,Analytical and Environmental Sciences Division and Centralized Instrumentation Facility, CSIR-Central Salt and Marine Chemicals Research Institute, Gijubhai Badheka Marg, Bhavnagar-364002, India
| | - Sakya S Sen
- Inorganic Chemistry and Catalysis Division, CSIR-National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune 411008, India. .,Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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3
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Kundu G, Dixit R, Tothadi S, Vanka K, Sen SS. Versatile chemistry of six-membered NHC with boranes: bromination at sp3 borane, activation of B–H bond of HBpin, and ring expansion of NHC. Dalton Trans 2022; 51:14452-14457. [DOI: 10.1039/d2dt01707e] [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
The NHC•borane chemistry has been majorly restricted to imidazol-2-ylidene classes of carbenes. In our previous communication, we have reported the synthesis of 6-SIDipp•BH3 [6-SIDipp = 1,3-di(2,6-diisopropylphenyl) tetrahydropyrimidine-2-ylidene] and its electrophilic...
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4
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Arrowsmith M, Endres S, Heinz M, Nestler V, Holthausen MC, Braunschweig H. Probing the Boundaries between Lewis-Basic and Redox Behavior of a Parent Borylene. Chemistry 2021; 27:17660-17668. [PMID: 34596278 PMCID: PMC9299150 DOI: 10.1002/chem.202103256] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2021] [Indexed: 11/09/2022]
Abstract
The parent borylene (CAAC)(Me3P)BH, 1 (CAAC=cyclic alkyl(amino)carbene), acts both as a Lewis base and one‐electron reducing agent towards group 13 trichlorides (ECl3, E=B, Al, Ga, In), yielding the adducts 1‐ECl3 and increasing proportions of the radical cation [1]•+ for the heavier group 13 analogues. With boron trihalides (BX3, X=F, Cl, Br, I) 1 undergoes sequential adduct formation and halide abstraction reactions to yield borylboronium cations and shows an increasing tendency towards redox processes for the heavier halides. Calculations confirm that 1 acts as a strong Lewis base towards EX3 and show a marked increase in the B−E bond dissociation energies down both group 13 and the halide group.
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Affiliation(s)
- Merle Arrowsmith
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Sara Endres
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Myron Heinz
- Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Str. 7, 60438, Frankfurt am Main, Germany
| | - Vincent Nestler
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Max C Holthausen
- Institut für Anorganische und Analytische Chemie, Goethe-Universität Frankfurt am Main, Max-von-Laue-Str. 7, 60438, Frankfurt am Main, Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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5
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Bonding in M(NHBMe)2 and M[Mn(CO)5]2 complexes (M=Zn, Cd, Hg; NHBMe=(HCNMe)2B): divalent group 12 metals with zero oxidation state. Theor Chem Acc 2021. [DOI: 10.1007/s00214-021-02751-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
AbstractQuantum chemical studies using density functional theory were carried out on M(NHBMe)2 and M[Mn(CO)5]2 (M=Zn, Cd, Hg) complexes. The calculations suggest that M(NHBMe)2 and M[Mn(CO)5]2 have D2d and D4d symmetry, respectively, with a 1A1 electronic ground state. The bond dissociation energies of the ligands have the order of Zn > Cd > Hg. A thorough bonding analysis using charge and energy decomposition methods suggests that the title complexes are best represented as NHBMe⇆M0⇄NHBMe and Mn(CO)5⇆M0⇄Mn(CO)5 where the metal atom M in the electronic ground state with an ns2 electron configuration is bonded to the (NHBMe)2 and [Mn(CO)5]2 ligands through donor–acceptor interaction. These experimentally known complexes are the first examples of mononuclear complexes with divalent group 12 metals with zero oxidation state that are stable at ambient condition. These complexes represent the rare situation where the ligands act as a strong acceptor and the metal center acts as strong donor. The relativistic effect of Hg leads to a weaker electron donating strength of the 6s orbital, which explains the trend of the bond dissociation energy.
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6
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Shere H, Hill MS, Pécharman AF, Mahon MF. Reactivity of a magnesium diboranate with organic nitriles. Dalton Trans 2021; 50:1283-1292. [PMID: 33393542 DOI: 10.1039/d0dt04016a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A series of complexes generated through reactions of the β-diketiminato magnesium diboranate species, [(BDI)Mg{(n-Bu)pinB-Bpin}] (BDI = HC{(Me)CNDipp}2; Dipp = 2,6-di-iso-propylphenyl), and a variety of organic nitriles are reported. Although, in every case, the diboranate anion acts as a surrogate source of the {Bpin} nucleophile, resulting in B-C bond formation at the electrophilic sp-hydridised nitrile carbon, the resultant compounds display a variable propensity to undergo subsequent reaction with additional nitrile equivalents. This behaviour is rationalised to be a consequence of substituent-dependent modulation in the basicity and resultant electrophilicity of magnesium-coordinated nitrile intermediates.
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Affiliation(s)
- Henry Shere
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
| | - Michael S Hill
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
| | | | - Mary F Mahon
- Department of Chemistry, University of Bath, Claverton Down, Bath, BA2 7AY, UK.
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7
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Koshino K, Kinjo R. Construction of σ-Aromatic AlB 2 Ring via Borane Coupling with a Dicoordinate Cyclic (Alkyl)(Amino)Aluminyl Anion. J Am Chem Soc 2020; 142:9057-9062. [PMID: 32321239 DOI: 10.1021/jacs.0c03179] [Citation(s) in RCA: 104] [Impact Index Per Article: 26.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Since the groundbreaking discovery in 2018 that the synthesis of a bottleable nucleophilic aluminyl anion is feasible, a handful of derivatives have been developed to date, which are, however, limited to diamino- and dialkyl-substituted species. Herein, we report the synthesis of a cyclic (alkyl)(amino)aluminyl anion based on a five-membered framework. The dicoordinate aluminum center features both a lone pair of electrons and an unoccupied 3p orbital, thus genuinely making it isoelectronic with carbenes. We show the bond formation and bond activation at the Al sphere: thus, not only does it undergo electron redistribution with borane to furnish a heteroatomic group 13 ring exhibiting a σ-aromatic nature concomitant with a three-center two-electron AlB2 bond but also the ambiphilic nature allows for oxidative addition of Si-H, N-H, and even C-C bonds at the aluminum center.
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Affiliation(s)
- Kota Koshino
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore
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8
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Gilmer J, Budy H, Kaese T, Bolte M, Lerner H, Wagner M. The 9H-9-Borafluorene Dianion: A Surrogate for Elusive Diarylboryl Anion Nucleophiles. Angew Chem Int Ed Engl 2020; 59:5621-5625. [PMID: 31834978 PMCID: PMC7155136 DOI: 10.1002/anie.201914219] [Citation(s) in RCA: 31] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2019] [Indexed: 11/13/2022]
Abstract
Double reduction of the THF adduct of 9H-9-borafluorene (1⋅THF) with excess alkali metal affords the dianion salts M2 [1] in essentially quantitative yields (M=Li-K). Even though the added charge is stabilized through π delocalization, [1]2- acts as a formal boron nucleophile toward organoboron (1⋅THF) and tetrel halide electrophiles (MeCl, Et3 SiCl, Me3 SnCl) to form B-B/C/Si/Sn bonds. The substrate dependence of open-shell versus closed-shell pathways has been investigated.
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Affiliation(s)
- Jannik Gilmer
- Institut für Anorganische ChemieGoethe-Universität FrankfurtMax-von-Laue-Strasse 760438Frankfurt (Main)Germany
| | - Hendrik Budy
- Institut für Anorganische ChemieGoethe-Universität FrankfurtMax-von-Laue-Strasse 760438Frankfurt (Main)Germany
| | - Thomas Kaese
- Institut für Anorganische ChemieGoethe-Universität FrankfurtMax-von-Laue-Strasse 760438Frankfurt (Main)Germany
| | - Michael Bolte
- Institut für Anorganische ChemieGoethe-Universität FrankfurtMax-von-Laue-Strasse 760438Frankfurt (Main)Germany
| | - Hans‐Wolfram Lerner
- Institut für Anorganische ChemieGoethe-Universität FrankfurtMax-von-Laue-Strasse 760438Frankfurt (Main)Germany
| | - Matthias Wagner
- Institut für Anorganische ChemieGoethe-Universität FrankfurtMax-von-Laue-Strasse 760438Frankfurt (Main)Germany
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9
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Gilmer J, Budy H, Kaese T, Bolte M, Lerner H, Wagner M. The 9
H
‐9‐Borafluorene Dianion: A Surrogate for Elusive Diarylboryl Anion Nucleophiles. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914219] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Jannik Gilmer
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Hendrik Budy
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Thomas Kaese
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Michael Bolte
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Hans‐Wolfram Lerner
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
| | - Matthias Wagner
- Institut für Anorganische Chemie Goethe-Universität Frankfurt Max-von-Laue-Strasse 7 60438 Frankfurt (Main) Germany
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10
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Saha R, Pan S, Chattaraj PK, Merino G. Filling the void: controlled donor-acceptor interaction facilitates the formation of an M-M single bond in the zero oxidation state of M (M = Zn, Cd, Hg). Dalton Trans 2020; 49:1056-1064. [PMID: 31848549 DOI: 10.1039/c9dt04213j] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The intriguing question of whether it is possible to form a genuine M0-M0 single bond for the M2 species (M = Zn, Cd, Hg) is addressed here. So far, all the bonds reported in the literature are exclusively MI-MI. Herein, we present viable M2(NHBMe)2 (M = Zn, Cd, Hg; NHBMe = (HCNMe)2B) complexes in which the controlled donor-acceptor interaction leads to an M0-M0 single bond. In these complexes, M2 in the 1∑g ground state with the (nσg+)2(nσu+)2 (n = 7, 10 and 14 for M = Zn, Cd and Hg, respectively) valence electron configuration forms donor-acceptor bonding with singlet 2NHBMe ligands where a combined effect of dominant (+,-) σ-backdonation from the antibonding (nσu+)2 orbital of M2 to the 2NHBMe ligands and a somewhat weaker (+,+) σ-donation from the 2NHBMe ligands to the bonding (n + 1)σg+ orbital leads to the unorthodox bonding situation of forming an M-M single bond in the zero oxidation state by eventually nullifying one effect by another. This is an unprecedented situation in the sense that the NHBMe ligand acts as a strong σ-acceptor and a weaker σ-donor. A comparison with the experimentally reported M2(PhDipp)2 complexes reveals the uniqueness of the NHBMe ligand in exhibiting such a bonding scenario. The M2(NHBMe)2 complex is thermochemically viable with respect to possible dissociation channels at room temperature, except for metal extrusion processes, M2(NHBMe)2 → M + M(NHBMe)2 and M2(NHBMe)2 → M2 + (NHBMe)2. Although the latter two processes are exergonic, they are kinetically protected by a high free energy barrier of 26.5-39.5 kcal mol-1. The experimental characterization of M2(PhDipp)2 despite similar exergonic channels reveals such kinetic stability to be enough for the viability of the M2(NHBMe)2 complexes. Furthermore, the ligand exchange reaction considering M2(PhMe)2 as the starting material also turned out to be feasible. Therefore, the M2(NHBMe)2 complexes are the first cases that feature a neutral M2 moiety with a single M0-M0 covalent bond, where M is a Group 12 metal.
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Affiliation(s)
- Ranajit Saha
- Department of Chemistry, Indian Institute of Technology Kharagpur, Kharagpur 721302, India.
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11
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Reddy GN, Parida R, Inostroza-Rivera R, Chakraborty A, Jena P, Giri S. Unique reactivity of B in B[Ge 9Y 3] 3 (Y = H, CH 3, BO, CN): formation of a Lewis base. Phys Chem Chem Phys 2019; 21:23301-23304. [PMID: 31490523 DOI: 10.1039/c9cp04361f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Boron compounds usually exhibit Lewis acidity at the boron center due to the presence of vacant p-orbitals. We show that this chemistry can be altered by an appropriate choice of ligands to decorate the boron center. To elucidate this effect, we studied the interactions of boron with two classes of ligands, one based on penta-substituted phenyl species (C6X5, X = F, BO, CN) and the other based on Zintl-ion-based groups (Ge9Y3, Y = H, CH3, BO, CN). An in-depth analysis of the charges and Fukui function values at the local atomic sites of the substituted boron derivatives B(C6X5)3 and B[Ge9Y3]3 shows that the B-center in the former is electrophilic, while it is nucleophilic in the latter. The chemical stability of the B[Ge9Y3]3 species is shown to be due to the presence of strong 2c-2e bonds between the B and Ge centers. Thus, the general notion of the Lewis acid nature of a boron center depends upon the choice of the ligand.
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Affiliation(s)
- G Naaresh Reddy
- School of Applied Sciences and Humanities, Haldia Institute of Technology, Haldia, 721657, India.
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12
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Brückner T, Dewhurst RD, Dellermann T, Müller M, Braunschweig H. Mild synthesis of diboryldiborenes by diboration of B-B triple bonds. Chem Sci 2019; 10:7375-7378. [PMID: 31489159 PMCID: PMC6713863 DOI: 10.1039/c9sc02544h] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2019] [Accepted: 06/08/2019] [Indexed: 01/30/2023] Open
Abstract
A set of diboryldiborenes are prepared by the mild, catalyst-free, room-temperature diboration of the B–B triple bonds of doubly base-stabilized diborynes.
A set of diboryldiborenes are prepared by the mild, catalyst-free, room-temperature diboration of the B–B triple bonds of doubly base-stabilized diborynes. Two of the product diboryldiborenes are found to be air- and water-stable in the solid state, an effect that is attributed to their high crystallinity and extreme insolubility in a wide range of solvents.
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Affiliation(s)
- Tobias Brückner
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . .,Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany
| | - Rian D Dewhurst
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . .,Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany
| | - Theresa Dellermann
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . .,Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany
| | - Marcel Müller
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . .,Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany
| | - Holger Braunschweig
- Institut für Anorganische Chemie , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . .,Institute for Sustainable Chemistry & Catalysis with Boron , Julius-Maximilians-Universität Würzburg , Am Hubland , 97074 Würzburg , Germany
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13
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Saha R, Pan S, Merino G, Chattaraj PK. Unprecedented Bonding Situation in Viable E
2
(NHB
Me
)
2
(E=Be, Mg; NHB
Me
=(HCN
Me
)
2
B) Complexes: Neutral E
2
Forms a Single E−E Covalent Bond. Angew Chem Int Ed Engl 2019; 58:8372-8377. [DOI: 10.1002/anie.201900992] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2019] [Indexed: 11/09/2022]
Affiliation(s)
- Ranajit Saha
- Department of ChemistryIndian Institute of Technology Kharagpur Kharagpur 721302 India
| | - Sudip Pan
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Gabriel Merino
- Departamento de Física AplicadaCentro de Investigación y de Estudios Avanzados Unidad Mérida. Km 6 Antigua Carretera a Progreso.Apdo. Postal 73, Cordemex 97310 Mérida Yuc. México
| | - Pratim K. Chattaraj
- Department of ChemistryIndian Institute of Technology Kharagpur Kharagpur 721302 India
- Department of Chemistry and Center for Theoretical StudiesIndian Institute of Technology Bombay Mumbai 400076 India
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14
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Saha R, Pan S, Merino G, Chattaraj PK. Unprecedented Bonding Situation in Viable E 2(NHB Me) 2(E=Be, Mg; NHB Me=(HCN Me) 2B) Complexes: Neutral E 2Forms a Single E−E Covalent Bond. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201900992] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Ranajit Saha
- Department of ChemistryIndian Institute of Technology Kharagpur Kharagpur 721302 India
| | - Sudip Pan
- Institute of Advanced SynthesisSchool of Chemistry and Molecular EngineeringNanjing Tech University Nanjing 211816 China
| | - Gabriel Merino
- Departamento de Física AplicadaCentro de Investigación y de Estudios Avanzados Unidad Mérida. Km 6 Antigua Carretera a Progreso.Apdo. Postal 73, Cordemex 97310 Mérida Yuc. México
| | - Pratim K. Chattaraj
- Department of ChemistryIndian Institute of Technology Kharagpur Kharagpur 721302 India
- Department of Chemistry and Center for Theoretical StudiesIndian Institute of Technology Bombay Mumbai 400076 India
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15
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Affiliation(s)
- Wei Lu
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
| | - Yongxin Li
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University, 637371, Singapore
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16
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Zhao Q, Dewhurst RD, Braunschweig H, Chen X. Boranchemie aus einer neuen Perspektive: Nukleophilie der B-H-Bindungselektronen. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201809733] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Qianyi Zhao
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials; School of Chemistry and Chemical Engineering; Henan Normal University; 46 E. Jianshe Rd. Xinxiang Henan 453007 China
| | - Rian D. Dewhurst
- Institut für Anorganische Chemie und Institut für nachhaltige Chemie und Katalyse mit Bor; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Holger Braunschweig
- Institut für Anorganische Chemie und Institut für nachhaltige Chemie und Katalyse mit Bor; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Xuenian Chen
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials; School of Chemistry and Chemical Engineering; Henan Normal University; 46 E. Jianshe Rd. Xinxiang Henan 453007 China
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou Henan 450001 China
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17
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Zhao Q, Dewhurst RD, Braunschweig H, Chen X. A New Perspective on Borane Chemistry: The Nucleophilicity of the B−H Bonding Pair Electrons. Angew Chem Int Ed Engl 2019; 58:3268-3278. [DOI: 10.1002/anie.201809733] [Citation(s) in RCA: 58] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2018] [Revised: 10/22/2018] [Indexed: 12/13/2022]
Affiliation(s)
- Qianyi Zhao
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials; School of Chemistry and Chemical Engineering; Henan Normal University; 46 E. Jianshe Rd. Xinxiang Henan 453007 China
| | - Rian D. Dewhurst
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Holger Braunschweig
- Institute for Inorganic Chemistry and Institute for Sustainable Chemistry & Catalysis with Boron; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Xuenian Chen
- Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials; School of Chemistry and Chemical Engineering; Henan Normal University; 46 E. Jianshe Rd. Xinxiang Henan 453007 China
- College of Chemistry and Molecular Engineering; Zhengzhou University; Zhengzhou Henan 450001 China
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18
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Nava P, Toure M, Abdou Mohamed A, Parrain JL, Chuzel O. Investigation of the rhodium-catalyzed hydroboration of NHC-boranes: the role of alkene coordination and the origin of enantioselectivity. Dalton Trans 2019; 48:17605-17611. [DOI: 10.1039/c9dt03660a] [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
The mechanism of the intramolecular enantioselective rhodium(i)-catalyzed hydroboration of NHC-boranes is investigated by experiments and calculations, using Density Functional Theory and Random Phase Approximation methods.
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Affiliation(s)
- Paola Nava
- Aix Marseille University
- CNRS
- Marseille
- France
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19
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Roy DK, Krummenacher I, Stennett TE, Lenczyk C, Thiess T, Welz E, Engels B, Braunschweig H. Selective one- and two-electron reductions of a haloborane enabled by a π-withdrawing carbene ligand. Chem Commun (Camb) 2018; 54:9015-9018. [PMID: 30046799 DOI: 10.1039/c8cc03433h] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
A carbene-stabilised neutral boryl radical and a boryl anion are isolated via selective one- and two-electron reduction of a diamidocarbene (DAC) adduct of dibromo(pentafluorophenyl)borane. Both the radical and the anion have been characterised by various spectroscopic techniques in solution, while the structures have been ascertained by single-crystal X-ray diffraction. In contrast, the reduction of the analogous cyclic (alkyl)(amino) carbene (CAAC) adduct yields a C-H activation product.
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Affiliation(s)
- Dipak Kumar Roy
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Ivo Krummenacher
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Tom E Stennett
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Carsten Lenczyk
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Torsten Thiess
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Eileen Welz
- Institute for Physical and Theoretical Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Bernd Engels
- Institute for Physical and Theoretical Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Holger Braunschweig
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany. and Institute for Sustainable Chemistry & Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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20
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Pécharman A, Hill MS, Mahon MF. Synthesis of Unsymmetrical Diboranes by Diborane Metathesis. Angew Chem Int Ed Engl 2018; 57:10688-10691. [DOI: 10.1002/anie.201803607] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2018] [Indexed: 12/24/2022]
Affiliation(s)
| | | | - Mary F. Mahon
- Department of ChemistryUniversity of Bath Bath BA2 7AY UK
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21
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Pécharman A, Hill MS, Mahon MF. Synthesis of Unsymmetrical Diboranes by Diborane Metathesis. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201803607] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
| | | | - Mary F. Mahon
- Department of ChemistryUniversity of Bath Bath BA2 7AY UK
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22
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Pécharman AF, Hill MS, Mahon MF. Diborane heterolysis: breaking and making B-B bonds at magnesium. Dalton Trans 2018; 47:7300-7305. [PMID: 29770411 DOI: 10.1039/c8dt01451e] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Reaction of the dimeric β-diketiminato magnesium hydride [(BDI)MgH]2 (BDI = HC{(Me)CN-2,6-i-Pr2C6H3}2) with bis-pinacolatodiborane (B2pin2) resulted in B-O bond activation and formation of a magnesium complex of an unusual borylborohydride anion. In contrast, similar treatment of the mononuclear organomagnesium [{BDI}Mg(n-Bu)] with 4,4,4',4',6,6'-hexamethyl-2,2'-bi(1,3,2-dioxaborinane) (B2hex2) provided a B(sp2)-B(sp3) diborane anion, [(hex)BB(n-Bu)(hex)]-, with a constitution which is analogous to that formed in the previously reported reaction with bis(pinacolato)diboron (B2pin2). Subsequent addition of 4-dimethylaminopyridine to a solution of this compound induced alkylborane displacement and provided a magnesium boryl derivative containing a terminal Mg-B(hex) interaction (Mg-B 2.319(3) Å), a result which reinforces the generality of this approach for the synthesis of boryl anions by B-B bond heterolysis. Further studies of the reactivity of the initially formed B(sp2)-B(sp3) anions with diborane small molecules also resulted in alkylborane displacement and the production of triboron anions, which are propagated by contiguous and electron precise (2c-2e) B-B-B interactions.
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23
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Himmel H. Nucleophilic Neutral Diborane(4) Compounds with sp
3
–sp
3
‐Hybridized Boron Atoms. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800031] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Hans‐Jörg Himmel
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
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24
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Wang H, Zhang J, Lee HK, Xie Z. Borylene Insertion into Cage B–H Bond: A Route to Electron-Precise B–B Single Bond. J Am Chem Soc 2018; 140:3888-3891. [DOI: 10.1021/jacs.8b01795] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hao Wang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Jiji Zhang
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Hung Kay Lee
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
| | - Zuowei Xie
- Department of Chemistry and State Key Laboratory of Synthetic Chemistry, The Chinese University of Hong Kong, Shatin, New Territories, Hong Kong, China
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25
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Pécharman AF, Hill MS, McMullin CL, Mahon MF. Magnesium Boryl Reactivity with 9-BBN and Ph3
B: Rational B−B′ Bond Formation and Diborane Isomerization. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201709902] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | - Michael S. Hill
- Department of Chemistry; University of Bath; Bath BA2 7AY UK
| | | | - Mary F. Mahon
- Department of Chemistry; University of Bath; Bath BA2 7AY UK
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26
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Pécharman AF, Hill MS, McMullin CL, Mahon MF. Magnesium Boryl Reactivity with 9-BBN and Ph 3 B: Rational B-B' Bond Formation and Diborane Isomerization. Angew Chem Int Ed Engl 2017; 56:16363-16366. [PMID: 29115736 PMCID: PMC5767756 DOI: 10.1002/anie.201709902] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Indexed: 12/19/2022]
Abstract
Reactions of a magnesium‐based pinacolatoboryl nucleophile with the electrophilic organoboranes, 9‐BBN and Ph3B, provide facile B−B′ single bond formation. Although the Ph3B derivative is thermally stable, when heated, the unsymmetrical diborane(5) anion derived from 9‐BBN is found to isomerize to two regioisomeric species via a proposed mechanism involving dehydroboration of the borabicyclo[3.3.1]nonane and syn‐diboration of the resultant alkenyl carbocycle.
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Affiliation(s)
| | - Michael S Hill
- Department of Chemistry, University of Bath, Bath, BA2 7AY, UK
| | | | - Mary F Mahon
- Department of Chemistry, University of Bath, Bath, BA2 7AY, UK
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27
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Landmann J, Hennig PT, Ignat'ev NV, Finze M. Borylation of fluorinated arenes using the boron-centred nucleophile B(CN) 32- - a unique entry to aryltricyanoborates. Chem Sci 2017; 8:5962-5968. [PMID: 28989626 PMCID: PMC5620525 DOI: 10.1039/c7sc02249b] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Accepted: 06/24/2017] [Indexed: 01/07/2023] Open
Abstract
The potassium salt of the boron-centred nucleophile B(CN)32- (1) readily reacts with perfluorinated arenes, such as hexafluorobenzene, decafluorobiphenyl, octafluoronaphthalene and pentafluoropyridine, which results in KF and the K+ salts of the respective borate anions with one {B(CN)3} unit bonded to the (hetero)arene. An excess of K21 leads to the successive reaction of two or, in the case of perfluoropyridine, even three C-F moieties and the formation of di- and trianions, respectively. Moreover, all of the 11 partially fluorinated benzene derivatives, C6F6-n H n (n = 1-5), generally react with K21 to give new tricyano(phenyl)borate anions with high chemo- and regioselectivity. A decreasing number of fluorine substituents on benzene results in a decrease in the reaction rate. In the cases of partially fluorinated benzenes, the addition of LiCl is advantageous or even necessary to facilitate the reaction. Also, pentafluorobenzenes R-C6F5 (R = -CN, -OMe, -Me, or -CF3) react via C-F/C-B exchange that mostly occurs in the para position and to a lesser extent in the meta or ortho positions. Most of the reactions proceed via an SNAr mechanism. The reaction of 1,4-F2C6H4 with K21 shows that an aryne mechanism has to be considered in some cases as well. In summary, a wealth of new stable tricyano(aryl)borates have been synthesised and fully characterized using multi-NMR spectroscopy and most of them were characterised using single-crystal X-ray diffraction.
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Affiliation(s)
- Johannes Landmann
- Institut für Anorganische Chemie , Institut für nachhaltige Chemie & Katalyse mit Bor (ICB) , Julius-Maximilians Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . https://go.uniwue.de/finze-group ;
| | - Philipp T Hennig
- Institut für Anorganische Chemie , Institut für nachhaltige Chemie & Katalyse mit Bor (ICB) , Julius-Maximilians Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . https://go.uniwue.de/finze-group ;
| | | | - Maik Finze
- Institut für Anorganische Chemie , Institut für nachhaltige Chemie & Katalyse mit Bor (ICB) , Julius-Maximilians Universität Würzburg , Am Hubland , 97074 Würzburg , Germany . https://go.uniwue.de/finze-group ;
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28
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Cao LL, Stephan DW. Homolytic Cleavage Reactions of a Neutral Doubly Base Stabilized Diborane(4). Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00522] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Levy L. Cao
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
| | - Douglas W. Stephan
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, Canada M5S 3H6
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29
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Stephan DW. Eine Geschichte über zwei Elemente: die Umpolung der Lewis-Acidität/Basizität von Bor und Phosphor. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700721] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Douglas W. Stephan
- Department of Chemistry; University of Toronto; 80 St. George St Toronto Ontario M5S3H6 Kanada
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30
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Stephan DW. A Tale of Two Elements: The Lewis Acidity/Basicity Umpolung of Boron and Phosphorus. Angew Chem Int Ed Engl 2017; 56:5984-5992. [DOI: 10.1002/anie.201700721] [Citation(s) in RCA: 54] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Indexed: 11/07/2022]
Affiliation(s)
- Douglas W. Stephan
- Department of Chemistry; University of Toronto; 80 St. George St Toronto Ontario M5S3H6 Canada
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31
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Arrowsmith M, Braunschweig H, Radacki K, Thiess T, Turkin A. Facile Access to Unprecedented Electron-Precise Monohydrodiboranes(4), cis-1,2-Dihydrodiboranes(4), and a 1,1-Dihydrodiborane(5). Chemistry 2017; 23:2179-2184. [PMID: 27935652 DOI: 10.1002/chem.201605270] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2016] [Indexed: 11/07/2022]
Abstract
2,3-Bis(dimethylamino)-substituted B2 N2 C2 heterocycles underwent selective dimethylamino/hydride exchange with either one or two equivalents of BH3 ⋅SMe2 to give the corresponding cyclic monohydrido- or (cis)1,2-dihydridodiboranes(4), respectively. Upon either heating or irradiation in solution, the latter underwent ring contraction to the corresponding five-membered BN2 C2 heterocycles, whereas irradiation of the 1,2-dimethylaminoethene-supported 1,2-dihydridodiborane(4) in the presence of PEt3 gave an unprecedented unsymmetrical 1,1-dihydrodiborane(5) phosphine adduct.
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Affiliation(s)
- Merle Arrowsmith
- Institute for Sustainable Chemistry and Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Holger Braunschweig
- Institute for Sustainable Chemistry and Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Krzysztof Radacki
- Institute for Sustainable Chemistry and Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Torsten Thiess
- Institute for Sustainable Chemistry and Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
| | - Arthur Turkin
- Institute for Sustainable Chemistry and Catalysis with Boron, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany.,Institute for Inorganic Chemistry, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074, Würzburg, Germany
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32
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Asami SS, Ishida S, Iwamoto T, Suzuki K, Yamashita M. Isolation and Characterization of Radical Anions Derived from a Boryl-Substituted Diphosphene. Angew Chem Int Ed Engl 2017; 56:1658-1662. [PMID: 28106347 DOI: 10.1002/anie.201611762] [Citation(s) in RCA: 55] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Indexed: 11/08/2022]
Abstract
Radical anions of a diphosphene with two boryl substituents were isolated and characterized by single-crystal X-ray diffraction, electron spin resonance (ESR), and UV/Vis absorption spectroscopy as well as DFT calculations. Structural analysis of the radical anions revealed an elongation of the P=P bond and a contraction of the B-P bonds relative to the neutral diphosphene. The UV/Vis spectra of these radical anions showed a strong absorption in the visible region, which was assigned to SOMO-related transitions on the basis of DFT calculations. The ESR spectra revealed that the hyperfine coupling constant with the phosphorus nuclei is the smallest that has been reported thus far. The results of the DFT calculations furthermore suggest that this should be attributed to a soaking of electron spin to the vacant p orbitals of the boryl substituents.
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Affiliation(s)
- Shun-Suke Asami
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Shintaro Ishida
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan
| | - Takeaki Iwamoto
- Department of Chemistry, Graduate School of Science, Tohoku University, Sendai, 980-8578, Japan
| | - Katsunori Suzuki
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Makoto Yamashita
- Department of Applied Chemistry, Graduate School of Engineering, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, Aichi, 464-8603, Japan.,Research Development Initiative, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, T, okyo, 112-8551, Japan
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33
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Kong L, Lu W, Yongxin L, Ganguly R, Kinjo R. Formation of Boron–Main-Group Element Bonds by Reactions with a Tricoordinate Organoboron L2PhB: (L = Oxazol-2-ylidene). Inorg Chem 2017; 56:5586-5593. [DOI: 10.1021/acs.inorgchem.6b02993] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Lingbing Kong
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, Singapore 637371, Singapore
| | - Wei Lu
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, Singapore 637371, Singapore
| | - Li Yongxin
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, Singapore 637371, Singapore
| | - Rakesh Ganguly
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, Singapore 637371, Singapore
| | - Rei Kinjo
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, Singapore 637371, Singapore
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34
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Asami SS, Ishida S, Iwamoto T, Suzuki K, Yamashita M. Isolation and Characterization of Radical Anions Derived from a Boryl-Substituted Diphosphene. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201611762] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Shun-suke Asami
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
| | - Shintaro Ishida
- Department of Chemistry; Graduate School of Science; Tohoku University; Sendai 980-8578 Japan
| | - Takeaki Iwamoto
- Department of Chemistry; Graduate School of Science; Tohoku University; Sendai 980-8578 Japan
| | - Katsunori Suzuki
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
| | - Makoto Yamashita
- Department of Applied Chemistry; Graduate School of Engineering; Nagoya University; Furo-cho, Chikusa-ku, Nagoya Aichi 464-8603 Japan
- Research Development Initiative; Chuo University; 1-13-27 Kasuga, Bunkyo-ku, T okyo 112-8551 Japan
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35
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Arrowsmith M, Braunschweig H, Stennett TE. Formation and Reactivity of Electron-Precise B−B Single and Multiple Bonds. Angew Chem Int Ed Engl 2016; 56:96-115. [DOI: 10.1002/anie.201610072] [Citation(s) in RCA: 185] [Impact Index Per Article: 23.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Indexed: 01/25/2023]
Affiliation(s)
- Merle Arrowsmith
- Julius Maximilians Universität Würzburg; Department of Chemistry; Am Hubland Würzburg 97074 Germany
| | - Holger Braunschweig
- Julius Maximilians Universität Würzburg; Department of Chemistry; Am Hubland Würzburg 97074 Germany
| | - Tom E. Stennett
- Julius Maximilians Universität Würzburg; Department of Chemistry; Am Hubland Würzburg 97074 Germany
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36
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Synthese und Reaktivität von Verbindungen mit elektronenpräzisen B‐B‐Einfach‐ und B‐B‐Mehrfachbindungen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201610072] [Citation(s) in RCA: 106] [Impact Index Per Article: 13.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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37
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Vondung L, Frank N, Fritz M, Alig L, Langer R. Phosphine-Stabilized Borylenes and Boryl Anions as Ligands? Redox Reactivity in Boron-Based Pincer Complexes. Angew Chem Int Ed Engl 2016; 55:14450-14454. [DOI: 10.1002/anie.201605838] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2016] [Revised: 08/12/2016] [Indexed: 11/11/2022]
Affiliation(s)
- Lisa Vondung
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Strasse 35032 Marburg Germany
| | - Nicolas Frank
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Strasse 35032 Marburg Germany
| | - Maximilian Fritz
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Strasse 35032 Marburg Germany
| | - Lukas Alig
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Strasse 35032 Marburg Germany
| | - Robert Langer
- Department of Chemistry; Philipps-Universität Marburg; Hans-Meerwein-Strasse 35032 Marburg Germany
- Lehn Institute of Functional Material (LIFM); Sun Yat-Sen University Guangzhou (SYSU); Xingang Road West Guangzhou 510275 PR China
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38
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Vondung L, Frank N, Fritz M, Alig L, Langer R. Phosphan-stabilisierte Borylene und Boryl-Anionen als Liganden? Redoxaktivität in Bor-basierten Pinzetten-Komplexen. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201605838] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Lisa Vondung
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Straße 35032 Marburg Deutschland
| | - Nicolas Frank
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Straße 35032 Marburg Deutschland
| | - Maximilian Fritz
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Straße 35032 Marburg Deutschland
| | - Lukas Alig
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Straße 35032 Marburg Deutschland
| | - Robert Langer
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Straße 35032 Marburg Deutschland
- Lehn Institute of Functional Material (LIFM); Sun Yat-Sen University Guangzhou (SYSU); Xingang Road West Guangzhou 510275 PR China
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39
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Asami SS, Okamoto M, Suzuki K, Yamashita M. A Boryl-Substituted Diphosphene: Synthesis, Structure, and Reaction with n-Butyllithium To Form a Stabilized Adduct by pπ-pπ Interaction. Angew Chem Int Ed Engl 2016; 55:12827-31. [PMID: 27629120 DOI: 10.1002/anie.201607995] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2016] [Indexed: 11/12/2022]
Abstract
A boryl-substituted diphosphene was synthesized through the nucleophilic borylation of PCl3 with a borylzinc reagent, followed by a reduction with Mg. A combined analysis of the resulting diboryldiphosphene by single-crystal X-ray diffraction, DFT calculations, and UV/Vis spectroscopy revealed a σ-electron-donating effect for the boryl substituent that was slightly weaker than that of the 2,4,6-tri-tert-butylphenyl (Mes*) ligand. The reaction of this diboryldiphosphene with (n) BuLi afforded a boryl-substituted phosphinophosphide that was, in comparison with the thermally unstable Mes*-substituted diaryldiphosphene, stabilized by a π-electron-accepting effect of the boryl substituent.
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Affiliation(s)
- Shun-Suke Asami
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Masafumi Okamoto
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Katsunori Suzuki
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan
| | - Makoto Yamashita
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University, 1-13-27 Kasuga, Bunkyo-ku, Tokyo, 112-8551, Japan.
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40
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Asami SS, Okamoto M, Suzuki K, Yamashita M. A Boryl-Substituted Diphosphene: Synthesis, Structure, and Reaction withn-Butyllithium To Form a Stabilized Adduct by pπ-pπ Interaction. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201607995] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Shun-suke Asami
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
| | - Masafumi Okamoto
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
| | - Katsunori Suzuki
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
| | - Makoto Yamashita
- Department of Applied Chemistry; Faculty of Science and Engineering; Chuo University; 1-13-27 Kasuga, Bunkyo-ku Tokyo 112-8551 Japan
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41
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Litters S, Kaifer E, Himmel H. Formation of a Radical Tricationic Tetraborane(4) by Hydride Abstraction from sp
3
–sp
3
‐Hybridized Diboranes. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600629] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Sebastian Litters
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Elisabeth Kaifer
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
| | - Hans‐Jörg Himmel
- Anorganisch‐Chemisches Institut Ruprecht‐Karls‐Universität Heidelberg Im Neuenheimer Feld 270 69120 Heidelberg Germany
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42
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Kong L, Lu W, Li Y, Ganguly R, Kinjo R. Isolation of a Diborane(6) Dication: Formation and Cleavage of an Electron-Precise B(sp3)–B(sp3) Bond. J Am Chem Soc 2016; 138:8623-9. [DOI: 10.1021/jacs.6b04858] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Lingbing Kong
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Wei Lu
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Yongxin Li
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Rakesh Ganguly
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Rei Kinjo
- Division
of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences, and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
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43
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Lu W, Hu H, Li Y, Ganguly R, Kinjo R. Isolation of 1,2,4,3-Triazaborol-3-yl-metal (Li, Mg, Al, Au, Zn, Sb, Bi) Derivatives and Reactivity toward CO and Isonitriles. J Am Chem Soc 2016; 138:6650-61. [DOI: 10.1021/jacs.6b03432] [Citation(s) in RCA: 95] [Impact Index Per Article: 11.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Wei Lu
- Division of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Haitao Hu
- Division of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Yongxin Li
- Division of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Rakesh Ganguly
- Division of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
| | - Rei Kinjo
- Division of Chemistry and Biological Chemistry, School of Physical
and Mathematical Sciences and ‡NTU-CBC Crystallography Facility, Nanyang Technological University, 637371, Singapore
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44
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Yamashita M. The Organometallic Chemistry of Boron-Containing Pincer Ligands based on Diazaboroles and Carboranes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2016. [DOI: 10.1246/bcsj.20150355] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Makoto Yamashita
- Department of Applied Chemistry, Faculty of Science and Engineering, Chuo University
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45
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Kisu H, Sakaino H, Ito F, Yamashita M, Nozaki K. A Qualitative Analysis of a “Bora-Brook Rearrangement”: The Ambident Reactivity of Boryl-Substituted Alkoxide Including the Carbon-to-Oxygen Migration of a Boryl Group. J Am Chem Soc 2016; 138:3548-52. [DOI: 10.1021/jacs.6b00283] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Haruki Kisu
- Department of Applied Chemistry, Faculty
of Science and Engineering, Chuo University, 1-13-27 Kasuga,
Bunkyo-ku, 112-8551 Tokyo, Japan
| | - Hirotoshi Sakaino
- Department of Chemistry and Biotechnology, Graduate School
of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan
| | - Fumihiro Ito
- Department of Chemistry and Biotechnology, Graduate School
of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan
| | - Makoto Yamashita
- Department of Applied Chemistry, Faculty
of Science and Engineering, Chuo University, 1-13-27 Kasuga,
Bunkyo-ku, 112-8551 Tokyo, Japan
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School
of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, 113-8656 Tokyo, Japan
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46
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Braunschweig H, Dewhurst RD, Pentecost L, Radacki K, Vargas A, Ye Q. Dative Bonding between Group 13 Elements Using a Boron-Centered Lewis Base. Angew Chem Int Ed Engl 2015; 55:436-40. [PMID: 26768824 DOI: 10.1002/anie.201509289] [Citation(s) in RCA: 50] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2015] [Indexed: 11/09/2022]
Abstract
An electron-rich monovalent boron compound is used as a Lewis base to prepare adducts with Group 13 Lewis acids using both its boron and nitrogen sites. The hard Lewis acid AlCl3 binds through a nitrogen atom of the Lewis base, while softer Lewis acids GaX3 (Cl, Br, I) bind at the boron atom. The latter are the first noncluster Lewis adducts between a boron-centered Lewis base and a main-group Lewis acid.
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Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany) http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/.
| | - Rian D Dewhurst
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany) http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/
| | - Leanne Pentecost
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton BN1 9QJ, Sussex (UK)
| | - Krzysztof Radacki
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany) http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/
| | - Alfredo Vargas
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton BN1 9QJ, Sussex (UK)
| | - Qing Ye
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg (Germany) http://www-anorganik.chemie.uni-wuerzburg.de/Braunschweig/
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47
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Braunschweig H, Dewhurst RD, Pentecost L, Radacki K, Vargas A, Ye Q. Dative Wechselwirkungen einer Bor-zentrierten Lewis-Base mit Gruppe-13-Elementen. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201509289] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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48
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Campos J, Aldridge S. Catalytic Borylation using an Air‐Stable Zinc Boryl Reagent: Systematic Access to Elusive Acylboranes. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507627] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Jesús Campos
- Inorganic Chemistry Laboratory, Dept. of Chemistry, University of Oxford, South Parks Rd, Oxford (UK) OX1 3QR
| | - Simon Aldridge
- Inorganic Chemistry Laboratory, Dept. of Chemistry, University of Oxford, South Parks Rd, Oxford (UK) OX1 3QR
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49
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Campos J, Aldridge S. Catalytic Borylation using an Air-Stable Zinc Boryl Reagent: Systematic Access to Elusive Acylboranes. Angew Chem Int Ed Engl 2015; 54:14159-63. [DOI: 10.1002/anie.201507627] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Indexed: 12/11/2022]
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50
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Dewhurst RD, Neeve EC, Braunschweig H, Marder TB. sp(2)-sp(3) diboranes: astounding structural variability and mild sources of nucleophilic boron for organic synthesis. Chem Commun (Camb) 2015; 51:9594-607. [PMID: 25912808 DOI: 10.1039/c5cc02316e] [Citation(s) in RCA: 202] [Impact Index Per Article: 22.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Despite the widespread use of organoborane reagents in organic synthesis and catalysis, a major challenge still remains: very few boron-centered nucleophiles exist for the direct construction of B-C bonds. Perhaps the most promising emerging solution to this problem is the use of sp(2)-sp(3) diboranes, in which one boron atom of a conventional diborane(4) is quaternised by either a neutral or anionic nucleophile. These compounds, either isolated or generated in situ, serve as relatively mild and convenient sources of the boryl anion [BR2](-) for use in organic synthesis and have already proven their efficacy in metal-free as well as metal-catalysed borylation reactions. This Feature article documents the history of sp(2)-sp(3) diborane synthesis, their properties and surprising structural variability, and their burgeoning utility in organic synthesis.
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Affiliation(s)
- Rian D Dewhurst
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
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