1
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Race JJ, Heyam A, Wiebe MA, Diego-Garcia Hernandez J, Ellis CE, Lei S, Manners I, Weller AS. Polyphosphinoborane Block Copolymer Synthesis Using Catalytic Reversible Chain-Transfer Dehydropolymerization. Angew Chem Int Ed Engl 2023; 62:e202216106. [PMID: 36394131 PMCID: PMC10107156 DOI: 10.1002/anie.202216106] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2022] [Revised: 11/15/2022] [Accepted: 11/17/2022] [Indexed: 11/19/2022]
Abstract
An amphiphilic block copolymer of polyphosphinoborane has been prepared by a mechanism-led strategy of the sequential catalytic dehydropolymerization of precursor monomers, H3 B ⋅ PRH2 (R=Ph, n-hexyl), using the simple pre-catalyst [Rh(Ph2 PCH2 CH2 PPh2 )2 ]Cl. Speciation, mechanism and polymer chain growth studies support a step-growth process where reversible chain transfer occurs, i.e. H3 B ⋅ PRH2 /oligomer/polymer can all coordinate with, and be activated by, the catalyst. Block copolymer [H2 BPPhH]110 -b-[H2 BP(n-hexyl)H]11 can be synthesized and self-assembles in solution to form either rod-like micelles or vesicles depending on solvent polarity.
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Affiliation(s)
- James J Race
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK.,Chemistry Research Laboratories, University of Oxford, Oxford, OX1 3TA, UK
| | - Alex Heyam
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
| | - Matthew A Wiebe
- Department of Chemistry, University of Victoria, Victoria, BC, V8P 5C2, Canada
| | | | - Charlotte E Ellis
- Department of Chemistry, University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Shixing Lei
- Department of Chemistry, University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Ian Manners
- Department of Chemistry, University of Victoria, Victoria, BC, V8P 5C2, Canada.,Centre for Advanced Materials and Related Technology (CAMTEC), University of Victoria, Victoria, BC, V8P 5C2, Canada
| | - Andrew S Weller
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, UK
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2
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Wang WP, Cui XH, Li M, Wang XC, Quan Z. Synthesis of P‐Arylphosphinecarboxamide Derivatives by Addition of N‐Arylphosphinecarboxamides with Aryne Precursors. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200124] [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]
Affiliation(s)
- Wen peng Wang
- Northwest Normal University College of Chemistry and Chemical Engineering CHINA
| | - Xing hao Cui
- Northwest Normal University College of Chemistry and Chemical Engineering CHINA
| | - Ming Li
- Northwest Normal University College of Chemistry and Chemical Engineering CHINA
| | - Xi cun Wang
- Northwest Normal University College of Chemistry and Chemical Engineering CHINA
| | - Zhengjun Quan
- Northwest Normal University College of Chemistry and Chemical Engineering Anning East Road 967 730070 Lanzhou CHINA
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3
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Perutz RN, Sabo‐Etienne S, Weller AS. Metathesis by Partner Interchange in σ‐Bond Ligands: Expanding Applications of the σ‐CAM Mechanism. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202111462] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
| | - Sylviane Sabo‐Etienne
- CNRS LCC (Laboratoire de Chimie de Coordination) 205 route de Narbonne, BP 44099 F-31077 Toulouse Cedex 4 France
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4
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Perutz RN, Sabo-Etienne S, Weller AS. Metathesis by Partner Interchange in σ-Bond Ligands: Expanding Applications of the σ-CAM Mechanism. Angew Chem Int Ed Engl 2021; 61:e202111462. [PMID: 34694734 PMCID: PMC9299125 DOI: 10.1002/anie.202111462] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2021] [Indexed: 12/13/2022]
Abstract
In 2007 two of us defined the σ‐Complex Assisted Metathesis mechanism (Perutz and Sabo‐Etienne, Angew. Chem. Int. Ed. 2007, 46, 2578–2592), that is, the σ‐CAM concept. This new approach to reaction mechanisms brought together metathesis reactions involving the formation of a variety of metal–element bonds through partner‐interchange of σ‐bond complexes. The key concept that defines a σ‐CAM process is a single transition state for metathesis that is connected by two intermediates that are σ‐bond complexes while the oxidation state of the metal remains constant in precursor, intermediates and product. This mechanism is appropriate in situations where σ‐bond complexes have been isolated or computed as well‐defined minima. Unlike several other mechanisms, it does not define the nature of the transition state. In this review, we highlight advances in the characterization and dynamic rearrangements of σ‐bond complexes, most notably alkane and zincane complexes, but also different geometries of silane and borane complexes. We set out a selection of catalytic and stoichiometric examples of the σ‐CAM mechanism that are supported by strong experimental and/or computational evidence. We then draw on these examples to demonstrate that the scope of the σ‐CAM mechanism has expanded to classes of reaction not envisaged in 2007 (additional σ‐bond ligands, agostic complexes, sp2‐carbon, surfaces). Finally, we provide a critical comparison to alternative mechanisms for metathesis of metal–element bonds.
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Affiliation(s)
- Robin N Perutz
- Department of Chemistry, University of York, York, YO10 5DD, UK
| | - Sylviane Sabo-Etienne
- CNRS, LCC (Laboratoire de Chimie de Coordination), 205 route de Narbonne, BP 44099, F-31077, Toulouse Cedex 4, France
| | - Andrew S Weller
- Department of Chemistry, University of York, York, YO10 5DD, UK
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5
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Fetrow TV, Daly SR. Mechanochemical synthesis and structural analysis of trivalent lanthanide and uranium diphenylphosphinodiboranates. Dalton Trans 2021; 50:11472-11484. [PMID: 34346459 DOI: 10.1039/d1dt01932e] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Phosphinodiboranates (H3BPR2BH3-) are a class of borohydrides that have merited a reputation as weakly coordinating anions, which is attributed in part to the dearth of coordination complexes known with transition metals, lanthanides, and actinides. We recently reported how K(H3BPtBu2BH3) exhibits sluggish salt elimination reactivity with f-metal halides in organic solvents such as Et2O and THF. Here we report how this reactivity appears to be further attenuated in solution when the tBu groups attached to phosphorus are exchanged for R = Ph or H, and we describe how mechanochemistry was used to overcome limited solution reactivity with K(H3BPPh2BH3). Grinding three equivalents of K(H3BPPh2BH3) with UI3(THF)4 or LnI3 (Ln = Ce, Pr, Nd) allowed homoleptic complexes with the empirical formulas U(H3BPPh2BH3)3 (1), Ce(H3BPPh2BH3)3 (2), Pr(H3BPPh2BH3)3 (3), and Nd(H3BPPh2BH3)3 (4) to be prepared and subsequently crystallized in good yields (50-80%). Single-crystal XRD studies revealed that all four complexes exist as dimers or coordination polymers in the solid-state, whereas 1H and 11B NMR spectra showed that they exist as a mixture of monomers and dimers in solution. Treating 4 with THF breaks up the dimer to yield the monomeric complex Nd(H3BPPh2BH3)3(THF)3 (4-THF). XRD studies revealed that 4-THF has one chelating and two dangling H3BPPh2BH3- ligands bound to the metal to accommodate binding of THF. In contrast to the results with K(H3BPPh2BH3), attempting the same mechanochemical reactions with Na(H3BPH2BH3) containing the simplest phosphinodiboranate were unsuccessful; only the partial metathesis product U(H3BPH2BH3)I2(THF)3 (5) was isolated in poor yields. Despite these limitations, our results offer new examples showing how mechanochemistry can be used to rapidly synthesize molecular coordination complexes that are otherwise difficult to prepare using more traditional solution methods.
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Affiliation(s)
- Taylor V Fetrow
- Department of Chemistry, The University of Iowa, E331 Chemistry Building, Iowa City, Iowa 52242, USA.
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6
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Faria EN, Jupp AR, Goicoechea JM. Novel primary phosphinecarboxamides derived from diamines. Dalton Trans 2021; 50:6991-6996. [PMID: 33949541 DOI: 10.1039/d1dt01198g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We describe the synthesis of N-functionalised phosphinecarboxamides obtained by reaction of the 2-phosphaethynolate anion (PCO-) with diamines, specifically hydrazine, methylenediamine and ethylenediamine, in the presence of acid. The resulting neutral compounds can be deprotonated to generate phosphide anions that, when further reacted with electrophiles, form secondary phosphines.
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Affiliation(s)
- Erica N Faria
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Andrew R Jupp
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
| | - Jose M Goicoechea
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA, UK.
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7
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Resendiz-Lara DA, Annibale VT, Knights AW, Chitnis SS, Manners I. High Molar Mass Poly(alkylphosphinoboranes) via Iron-Catalyzed Dehydropolymerization. Macromolecules 2020. [DOI: 10.1021/acs.macromol.0c02082] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Vincent T. Annibale
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
- Department of Chemistry, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada
| | - Alastair W. Knights
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Saurabh S. Chitnis
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
| | - Ian Manners
- School of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, U.K
- Department of Chemistry, University of Victoria, 3800 Finnerty Road, Victoria, British Columbia V8P 5C2, Canada
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8
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Morris LJ, Hill MS, Mahon MF, Manners I, Patrick BO. Alkaline-Earth Derivatives of Diphenylphosphine–Borane. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00008] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Louis J. Morris
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Michael S. Hill
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Mary F. Mahon
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, U.K
| | - Ian Manners
- Department of Chemistry, University of Victoria, Victoria, British Columbia V8P 5C2, Canada
| | - Brian O. Patrick
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, British Columbia V6T 1Z1, Canada
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9
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Arz MI, Knights AW, Manners I. Synthesis and Post-Polymerization Functionalization of Halogen-Substituted Polyphosphinoboranes to Access Alkyne-Functionalized Derivatives. Macromol Rapid Commun 2019; 41:e1900468. [PMID: 31880037 DOI: 10.1002/marc.201900468] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Revised: 10/19/2019] [Indexed: 01/12/2023]
Abstract
Catalytic dehydropolymerization of halogen-functionalized phosphine-boranes (4-X-C6 H4 )PH2 ⋅BH3 (1a: X = Br, 1b: X = I) with [CpFe(CO)2 (OTf)] at 100 °C provides convenient access to halogen-functionalized polyphosphinoboranes [(4-X-C6 H4 )PH-BH2 ]n (2a: X = Br, 2b: X = I). These polymers are useful precursors for post-polymerization functionalization, which is demonstrated by Sonogashira coupling under mild conditions to yield the alkynyl-functionalized polyphosphinoborane [(4-PhCC-C6 H4 )PH-BH2 ]n (3).
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Affiliation(s)
- Marius I Arz
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Alastair W Knights
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK
| | - Ian Manners
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS8 1TS, UK.,Department of Chemistry, University of Victoria, 3800 Finnerty Road, Victoria, BC, V8P 5C2, Canada
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10
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Han D, Anke F, Trose M, Beweries T. Recent advances in transition metal catalysed dehydropolymerisation of amine boranes and phosphine boranes. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2018.09.016] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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11
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Vondung L, Alig L, Ballmann M, Langer R. Umpolung at Boron: Ancillary-Ligand-Induced Formation of Boron-Based Donor Ligands from Phosphine-Boranes. Chemistry 2018; 24:12346-12353. [DOI: 10.1002/chem.201705847] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Lisa Vondung
- Fachbereich Chemie; Philipps-Universität; Hans-Meerwein-Strasse 4 35032 Marburg Germany
| | - Lukas Alig
- Fachbereich Chemie; Philipps-Universität; Hans-Meerwein-Strasse 4 35032 Marburg Germany
| | - Monika Ballmann
- Fachbereich Chemie; Philipps-Universität; Hans-Meerwein-Strasse 4 35032 Marburg Germany
| | - Robert Langer
- Fachbereich Chemie; Philipps-Universität; Hans-Meerwein-Strasse 4 35032 Marburg Germany
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12
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Paul USD, Braunschweig H, Radius U. Iridium-catalysed dehydrocoupling of aryl phosphine-borane adducts: synthesis and characterisation of high molecular weight poly(phosphinoboranes). Chem Commun (Camb) 2018; 52:8573-6. [PMID: 27320239 DOI: 10.1039/c6cc04363a] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The thermal dehydrogenative coupling of aryl phosphine-borane adducts with iridium complexes bearing a bis(phosphinite) pincer ligand is reported. This catalysis produces high molecular weight poly(phosphinoboranes) [ArPH-BH2]n (Ar = Ph, (p)Tol, Mes). Furthermore, we investigated the reactivity of these pincer complexes towards primary phosphines and their respective borane adducts on a stoichiometric scale.
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Affiliation(s)
- Ursula S D Paul
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
| | - Holger Braunschweig
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
| | - Udo Radius
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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13
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Marquardt C, Hegen O, Vogel A, Stauber A, Bodensteiner M, Timoshkin AY, Scheer M. Depolymerization of Poly(phosphinoboranes): From Polymers to Lewis Base Stabilized Monomers. Chemistry 2017; 24:360-363. [PMID: 29166549 DOI: 10.1002/chem.201705510] [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: 11/20/2017] [Indexed: 01/10/2023]
Abstract
We report on depolymerization reactions of poly(phosphinoboranes). The cleavage of the polymers [H2 PBH2 ]n (2 a), [tBuHPBH2 ]n (2 c), [PhHPBH2 ]n (2 e) and the oligomer [Ph2 PBH2 ]n (2 b), with strong Lewis bases (LBs), in particular with NHCs, leads to the corresponding monomeric phosphanylboranes R1 R2 PBH2 LB. It is observed that the depolymerization depends on the strength and stability of the LBs as well as on the substitution pattern of the poly(phosphinoboranes). The solid state structures of the monomeric phosphinoboranes H2 PBH2 NHCMe (NHC=N-heterocyclic carbene) (4 a), H2 PBH2 NHCdipp (5 a) and tBuHPBH2 NHCMe (4 c) were determined. DFT calculations support the experimentally observed reaction behavior.
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Affiliation(s)
- Christian Marquardt
- Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany
| | - Oliver Hegen
- Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany
| | - Ariane Vogel
- Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany
| | - Andreas Stauber
- Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany
| | - Michael Bodensteiner
- Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany
| | - Alexey Y Timoshkin
- Institute of Chemistry, St. Petersburg State University, 199034 Universitetskaya emb. 7/9, St. Petersburg, Russia
| | - Manfred Scheer
- Institut für Anorganische Chemie, Universität Regensburg, 93040, Regensburg, Germany
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14
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Wu YH, Li ZF, Wang WP, Wang XC, Quan ZJ. Mechanochemical Synthesis of Phosphinecarboxamides by Reaction of 2-Phosphaethynolate Anion and Amines under Acid-Free Conditions: A Combined Scope and Mechanism Investigation. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700867] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yong-Hui Wu
- Laboratory of Eco-Environment-Related Polymer Materials; Ministry of Education, China; Gansu Key Laboratory of Polymer Materials; College of Chemistry and Chemical Engineering; Northwest Normal University; 730070 Lanzhou Gansu People's Republic of China
| | - Zhi-Feng Li
- College of Chemical Engineering and Technology; Key Laboratory for New Molecule Design and Function of Gansu Universities; Tianshui Normal University; 741001 Tianshui People's Republic of China
| | - Wen-Peng Wang
- Laboratory of Eco-Environment-Related Polymer Materials; Ministry of Education, China; Gansu Key Laboratory of Polymer Materials; College of Chemistry and Chemical Engineering; Northwest Normal University; 730070 Lanzhou Gansu People's Republic of China
| | - Xi-Cun Wang
- Laboratory of Eco-Environment-Related Polymer Materials; Ministry of Education, China; Gansu Key Laboratory of Polymer Materials; College of Chemistry and Chemical Engineering; Northwest Normal University; 730070 Lanzhou Gansu People's Republic of China
| | - Zheng-Jun Quan
- Laboratory of Eco-Environment-Related Polymer Materials; Ministry of Education, China; Gansu Key Laboratory of Polymer Materials; College of Chemistry and Chemical Engineering; Northwest Normal University; 730070 Lanzhou Gansu People's Republic of China
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15
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Hill AF, Ward JS. Synthetic and structural studies of phosphine coordinated boronium salts. Dalton Trans 2017; 46:7291-7308. [PMID: 28540968 DOI: 10.1039/c7dt01023k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of BrH2B·SMe2 with primary and secondary phosphines affords a range of boronium salts of the form [H2B(PR3)2]Br (PR3 = PHCy21; PHPh2, 2; PH2Cy, 3), which have been fully characterised including solid-state determinations. Reactions of bulky tertiary phosphines, e.g., PCy3 and PPh3, with BrH2B·SMe2 do not proceed beyond the phosphine-stabilised bromoborane adducts, however, the smaller tertiary phosphine PMe2Ph readily proceeds to form [H2B(PMe2Ph)2]Br (4). The formation of the unsymmetrical boronium salts [H2B(PH2Cy)(PHCy2)]Br (5) and [H2B(PHCy2)(PHPh2)]Br (6) was observed by in situ NMR spectroscopy, however, the compounds were found to spontaneously disproportionate to their respective homophosphine boronium cations, even on prolonged storage in solution at -78 °C. Di- and triphosphines were found to form ring-closed boronium salts to afford [H2B(κ2-P,P'-diphosphine)]Br (diphosphine = dppe, 7; dcpe, 8; dmpe, 9; dppf, 10; dppf with [AsF6]- counterion, 11; amphos, 12). The analogous methodology with Br2HB·SMe2 proved less generally applicable due to an accessible decomposition pathway being available to boronium salts bearing primary and secondary phosphines, leading to the formation of phosphonium salts, although [BrHB(dcpe)]Br (13), [BrHB(PMe2Ph)2]Br (14) and [BrHB(amphos)]Br (15) were synthesised with varying degrees of success. Reaction of BrH2B·SMe2 with diphars afforded the boronium salt [H2B(κ2-P,P'-diphars)]Br (16), which featured two pendant arsine arms. Similarly, triphos was found to react with BrH2B·SMe2 to give [H2B(κ2-P,P'-triphos)]Br (17), which featured a pendant phosphine arm. Substitution of the bromide counter anion with either hexafluoroarsenate or hexfluoroantimonate anions revealed weak hydrogen bonds between the P-H bonds of the boronium cations and the anions, that appeared through NMR studies to be retained in solution (where hydrogen bonding order was determined to be Br- > [SbF6]-/[AsF6]-). This was further demonstrated by comparison of solid-state structures and solution NMR data of 1 with [H2B(PHCy2)2][SbF6] (18), 4 with [H2B(PMe2Ph)2][AsF6] (19) and 17 with [H2B(triphos)][AsF6] (20).
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Affiliation(s)
- Anthony F Hill
- Research School of Chemistry, The Australian National University, Canberra, ACT 2601, Australia.
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16
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Marquardt C, Hegen O, Kahoun T, Scheer M. Oxidation of Substituted Phosphanylboranes with Chalcogens. Chemistry 2017; 23:4397-4404. [DOI: 10.1002/chem.201605625] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2016] [Indexed: 11/06/2022]
Affiliation(s)
- Christian Marquardt
- Institut für Anorganische Chemie; Universität Regensburg; 93040 Regensburg Germany
| | - Oliver Hegen
- Institut für Anorganische Chemie; Universität Regensburg; 93040 Regensburg Germany
| | - Tobias Kahoun
- Institut für Anorganische Chemie; Universität Regensburg; 93040 Regensburg Germany
| | - Manfred Scheer
- Institut für Anorganische Chemie; Universität Regensburg; 93040 Regensburg Germany
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17
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Pike SD, Crimmin MR, Chaplin AB. Organometallic chemistry using partially fluorinated benzenes. Chem Commun (Camb) 2017; 53:3615-3633. [DOI: 10.1039/c6cc09575e] [Citation(s) in RCA: 72] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Fluorobenzenes, in particular fluorobenzene (FB) and 1,2-difluorobenzene (1,2-DiFB), are versatile solvents for conducting organometallic chemistry and transition-metal-based catalysis.
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Affiliation(s)
| | - Mark R. Crimmin
- Department of Chemistry
- Imperial College London
- London SW7 2AZ
- UK
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18
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Stauber A, Jurca T, Marquardt C, Fleischmann M, Seidl M, Whittell GR, Manners I, Scheer M. A Convenient Route to Monoalkyl‐Substituted Phosphanylboranes (HRP–BH2–NMe3): Prospective Precursors to Poly[(alkylphosphino)boranes]. Eur J Inorg Chem 2016. [DOI: 10.1002/ejic.201600226] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Andreas Stauber
- Institut für Anorganische ChemieUniversity of Regensburg93040RegensburgGermany
| | - Titel Jurca
- School of ChemistryBristol UniversityCantock's CloseBS8 1TSBristolUK
| | - Christian Marquardt
- Institut für Anorganische ChemieUniversity of Regensburg93040RegensburgGermany
| | - Martin Fleischmann
- Institut für Anorganische ChemieUniversity of Regensburg93040RegensburgGermany
| | - Michael Seidl
- Institut für Anorganische ChemieUniversity of Regensburg93040RegensburgGermany
| | | | - Ian Manners
- School of ChemistryBristol UniversityCantock's CloseBS8 1TSBristolUK
| | - Manfred Scheer
- Institut für Anorganische ChemieUniversity of Regensburg93040RegensburgGermany
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19
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Serrano ÁL, Casado MA, Ciriano MA, de Bruin B, López JA, Tejel C. Nucleophilicity and P-C Bond Formation Reactions of a Terminal Phosphanido Iridium Complex. Inorg Chem 2016; 55:828-39. [PMID: 26695592 DOI: 10.1021/acs.inorgchem.5b02301] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The diiridium complex [{Ir(ABPN2)(CO)}2(μ-CO)] (1; [ABPN2](-) = [(allyl)B(Pz)2(CH2PPh2)](-)) reacts with diphenylphosphane affording [Ir(ABPN2)(CO)(H) (PPh2)] (2), the product of the oxidative addition of the P-H bond to the metal. DFT studies revealed a large contribution of the terminal phosphanido lone pair to the HOMO of 2, indicating nucleophilic character of this ligand, which is evidenced by reactions of 2 with typical electrophiles such as H(+), Me(+), and O2. Products from the reaction of 2 with methyl chloroacetate were found to be either [Ir(ABPN2)(CO)(H)(PPh2CH2CO2Me)][PF6] ([6]PF6) or [Ir(ABPN2)(CO)(Cl)(H)] (7) and the free phosphane (PPh2CH2CO2Me), both involving P-C bond formation, depending on the reaction conditions. New complexes having iridacyclophosphapentenone and iridacyclophosphapentanone moieties result from reactions of 2 with dimethyl acetylenedicarboxylate and dimethyl maleate, respectively, as a consequence of a further incorporation of the carbonyl ligand. In this line, the terminal alkyne methyl propiolate gave a mixture of a similar iridacyclophosphapentanone complex and [Ir(ABPN2){CH═C(CO2Me)-CO}{PPh2-CH═CH(CO2Me)}] (10), which bears the functionalized phosphane PPh2-CH═CH(CO2Me) and an iridacyclobutenone fragment. Related model reactions aimed to confirm mechanistic proposals are also studied.
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Affiliation(s)
- Ángel L Serrano
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza , Pedro Cerbuna 12, 50009-Zaragoza, Spain
| | - Miguel A Casado
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza , Pedro Cerbuna 12, 50009-Zaragoza, Spain
| | - Miguel A Ciriano
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza , Pedro Cerbuna 12, 50009-Zaragoza, Spain
| | - Bas de Bruin
- Homogeneous and Supramolecular Catalysis, van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam , Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - José A López
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza , Pedro Cerbuna 12, 50009-Zaragoza, Spain
| | - Cristina Tejel
- Departamento de Química Inorgánica, Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza , Pedro Cerbuna 12, 50009-Zaragoza, Spain
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Hooper TN, Weller AS, Beattie NA, Macgregor SA. Dehydrocoupling of phosphine-boranes using the [RhCp*Me(PMe 3)(CH 2Cl 2)][BAr F4] precatalyst: stoichiometric and catalytic studies. Chem Sci 2015; 7:2414-2426. [PMID: 29997783 PMCID: PMC6003611 DOI: 10.1039/c5sc04150c] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Accepted: 12/19/2015] [Indexed: 01/08/2023] Open
Abstract
Detailed experimental and computational studies are reported on the fundamental B–H and P–H bond activation steps involved in the dehydrocoupling/dehydropolymerization of primary and secondary phosphine–boranes, H3B·PPhR′H (R = Ph, H), using the [RhCp*(PMe3)Me(ClCH2Cl)][BArF4] catalyst.
We report a detailed, combined experimental and computational study on the fundamental B–H and P–H bond activation steps involved in the dehydrocoupling/dehydropolymerization of primary and secondary phosphine–boranes, H3B·PPhR′H (R = Ph, H), using [RhCp*(PMe3)Me(ClCH2Cl)][BArF4], to either form polyphosphino-boranes [H2B·PPhH]n (Mn ∼ 15 000 g mol–1, PDI = 2.2) or the linear diboraphosphine H3B·PPh2BH2·PPh2H. A likely polymer-growth pathway of reversible chain transfer step-growth is suggested for H3B·PPhH2. Using secondary phosphine–boranes as model substrates a combined synthesis, structural (X-ray crystallography), labelling and computational approach reveals: initial bond activation pathways (B–H activation precedes P–H activation); key intermediates (phosphido-boranes, α-B-agostic base-stabilized boryls); and a catalytic route to the primary diboraphosphine (H3B·PPhHBH2·PPhH2). It is also shown that by changing the substituent at phosphorus (Ph or Cy versustBu) different final products result (phosphido-borane or base stabilized phosphino-borane respectively). These studies provide detailed insight into the pathways that are operating during dehydropolymerization.
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Affiliation(s)
- Thomas N Hooper
- Department of Chemistry , Chemistry Research Laboratories , University of Oxford , Mansfield Road , Oxford , OX1 3TA , UK .
| | - Andrew S Weller
- Department of Chemistry , Chemistry Research Laboratories , University of Oxford , Mansfield Road , Oxford , OX1 3TA , UK .
| | - Nicholas A Beattie
- Institute of Chemical Sciences , Heriot Watt University , Edinburgh , EH14 4AS , UK .
| | - Stuart A Macgregor
- Institute of Chemical Sciences , Heriot Watt University , Edinburgh , EH14 4AS , UK .
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Marquardt C, Jurca T, Schwan KC, Stauber A, Virovets AV, Whittell GR, Manners I, Scheer M. Metal-Free Addition/Head-to-Tail Polymerization of Transient Phosphinoboranes, RPH-BH2: A Route to Poly(alkylphosphinoboranes). Angew Chem Int Ed Engl 2015; 54:13782-6. [PMID: 26427911 PMCID: PMC4648028 DOI: 10.1002/anie.201507084] [Citation(s) in RCA: 77] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Indexed: 11/12/2022]
Abstract
Mild thermolysis of Lewis base stabilized phosphinoborane monomers R(1)R(2)P-BH2⋅NMe3 (R(1),R(2)=H, Ph, or tBu/H) at room temperature to 100 °C provides a convenient new route to oligo- and polyphosphinoboranes [R(1)R(2)P-BH2]n. The polymerization appears to proceed via the addition/head-to-tail polymerization of short-lived free phosphinoborane monomers, R(1)R(2)P-BH2. This method offers access to high molar mass materials, as exemplified by poly(tert-butylphosphinoborane), that are currently inaccessible using other routes (e.g. catalytic dehydrocoupling).
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Affiliation(s)
- Christian Marquardt
- Universität Regensburg, Institut für Anorganische Chemie93040 Regensburg (Germany) E-mail:
| | - Titel Jurca
- School of Chemistry, Bristol UniversityCantock's Close, BS8 1TS, Bristol (UK) E-mail:
| | - Karl-Christian Schwan
- Universität Regensburg, Institut für Anorganische Chemie93040 Regensburg (Germany) E-mail:
| | - Andreas Stauber
- Universität Regensburg, Institut für Anorganische Chemie93040 Regensburg (Germany) E-mail:
| | - Alexander V Virovets
- Universität Regensburg, Institut für Anorganische Chemie93040 Regensburg (Germany) E-mail:
| | - George R Whittell
- School of Chemistry, Bristol UniversityCantock's Close, BS8 1TS, Bristol (UK) E-mail:
| | - Ian Manners
- School of Chemistry, Bristol UniversityCantock's Close, BS8 1TS, Bristol (UK) E-mail:
| | - Manfred Scheer
- Universität Regensburg, Institut für Anorganische Chemie93040 Regensburg (Germany) E-mail:
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Marquardt C, Jurca T, Schwan KC, Stauber A, Virovets AV, Whittell GR, Manners I, Scheer M. Metallfreie Additions-/Kopf-Schwanz-Polymerisation von intermediär gebildeten Phosphanylboranen, RPH-BH2: ein Weg zu Poly(alkylphosphanylboranen). Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201507084] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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Drover MW, Johnson HC, Schafer LL, Love JA, Weller AS. Reactivity of an Unsaturated Iridium(III) Phosphoramidate Complex, [Cp*Ir{κ2-N,O}][BArF4]. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00397] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Marcus W. Drover
- Department
of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
- Chemistry Research
Laboratories, Department of Chemistry, The University of Oxford, Mansfield Road, Oxford, U.K. OX1 3TA
| | - Heather C. Johnson
- Chemistry Research
Laboratories, Department of Chemistry, The University of Oxford, Mansfield Road, Oxford, U.K. OX1 3TA
| | - Laurel L. Schafer
- Department
of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Jennifer A. Love
- Department
of Chemistry, The University of British Columbia, 2036 Main Mall, Vancouver, British Columbia, Canada V6T 1Z1
| | - Andrew S. Weller
- Chemistry Research
Laboratories, Department of Chemistry, The University of Oxford, Mansfield Road, Oxford, U.K. OX1 3TA
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Jupp AR, Trott G, Payen de la Garanderie É, Holl JDG, Carmichael D, Goicoechea JM. Exploiting the Brønsted acidity of phosphinecarboxamides for the synthesis of new phosphides and phosphines. Chemistry 2015; 21:8015-8. [PMID: 25892576 PMCID: PMC4515089 DOI: 10.1002/chem.201501174] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2015] [Indexed: 11/24/2022]
Abstract
We demonstrate that the synthesis of new N-functionalized phosphinecarboxamides is possible by reaction of primary and secondary amines with PCO(-) in the presence of a proton source. These reactions proceed with varying degrees of success, and although primary amines generally afford the corresponding phosphinecarboxamides in good yields, secondary amines react more sluggishly and often give rise to significant decomposition of the 2-phosphaethynolate precursor. Of the new N-derivatized phosphinecarboxamides available, PH2C(O)NHCy (Cy = cyclohexyl) can be obtained in sufficiently high yields to allow for the exploration of its Brønsted acidity. Thus, deprotonating PH2C(O)NHCy with one equivalent of potassium bis(trimethylsilyl)amide (KHMDS) gave the new phosphide [PHC(O)NHCy](-). In contrast, deprotonation with half of an equivalent gives rise to [P{C(O)NHCy}2](-) and PH3. These phosphides can be employed to give new phosphines by reactions with electrophiles, thus demonstrating their enormous potential as chemical building blocks.
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Affiliation(s)
- Andrew R Jupp
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA (UK)
| | - Gemma Trott
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA (UK)
| | | | - James D G Holl
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA (UK)
| | - Duncan Carmichael
- Laboratoire de Chimie Moléculaire, École Polytechnique, CNRS, 91128 Palaiseau cedex (France)
| | - Jose M Goicoechea
- Department of Chemistry, University of Oxford, Chemistry Research Laboratory, 12 Mansfield Road, Oxford, OX1 3TA (UK).
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25
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Relative binding affinities of fluorobenzene ligands in cationic rhodium bisphosphine η6–fluorobenzene complexes probed using collision-induced dissociation. J Organomet Chem 2015. [DOI: 10.1016/j.jorganchem.2014.08.012] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Schäfer A, Jurca T, Turner J, Vance JR, Lee K, Du VA, Haddow MF, Whittell GR, Manners I. Iron-Catalyzed Dehydropolymerization: A Convenient Route to Poly(phosphinoboranes) with Molecular-Weight Control. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411957] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Schäfer A, Jurca T, Turner J, Vance JR, Lee K, Du VA, Haddow MF, Whittell GR, Manners I. Iron-catalyzed dehydropolymerization: a convenient route to poly(phosphinoboranes) with molecular-weight control. Angew Chem Int Ed Engl 2015; 54:4836-41. [PMID: 25712707 DOI: 10.1002/anie.201411957] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2014] [Revised: 01/29/2015] [Indexed: 01/21/2023]
Abstract
The catalyst loading is the key to control the molecular weight of the polymer in the iron-catalyzed dehydropolymerization of phosphine-borane adducts. Studies showed that the reaction proceeds through a chain-growth coordination-insertion mechanism.
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Affiliation(s)
- André Schäfer
- School of Chemistry, Bristol University, Cantock's Close, BS8 1TS, Bristol (UK); Current adress: Saarland University, Department 8.1-Chemistry, 66123 Saarbrücken (Germany)
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28
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Riddlestone IM, Abdalla JA, Aldridge S. Coordination and Activation of EH Bonds (E=B, Al, Ga) at Transition Metal Centers. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2015. [DOI: 10.1016/bs.adomc.2015.02.003] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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Johnson HC, Leitao EM, Whittell GR, Manners I, Lloyd-Jones GC, Weller AS. Mechanistic Studies of the Dehydrocoupling and Dehydropolymerization of Amine–Boranes Using a [Rh(Xantphos)]+ Catalyst. J Am Chem Soc 2014; 136:9078-93. [DOI: 10.1021/ja503335g] [Citation(s) in RCA: 118] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Heather C. Johnson
- Department
of Chemistry, Chemistry Research Laboratories, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
| | - Erin M. Leitao
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - George R. Whittell
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Ian Manners
- School
of Chemistry, University of Bristol, Cantock’s Close, Bristol BS8 1TS, United Kingdom
| | - Guy C. Lloyd-Jones
- School
of Chemistry, University of Edinburgh, West Mains Road, Edinburgh EH9 3JJ, United Kingdom
| | - Andrew S. Weller
- Department
of Chemistry, Chemistry Research Laboratories, University of Oxford, Mansfield Road, Oxford OX1 3TA, United Kingdom
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31
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Johnson HC, Torry-Harris R, Ortega L, Theron R, McIndoe JS, Weller AS. Exploring the mechanism of the hydroboration of alkenes by amine–boranes catalysed by [Rh(xantphos)]+. Catal Sci Technol 2014. [DOI: 10.1039/c4cy00597j] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The [Rh(xantphos)]+ fragment acts as an effective catalyst for the hydroboration of the alkene TBE (tert-butyl ethene) using the amine–borane H3B·NMe3 at low (0.5 mol%) catalyst loadings to give the linear product.
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Affiliation(s)
| | | | - Laura Ortega
- Visiting Student from Departamento de Química Inorgańica
- Instituto de Investigaciones Químicas (IIQ)
- Universidad de Sevilla
- Consejo Superior de Investigaciones Científicas
- 41092 Sevilla, Spain
| | - Robin Theron
- Department of Chemistry
- University of Victoria
- Victoria, Canada
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