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Hall MR, Korb M, Moggach SA, Low PJ. Oxidative Coupling of Ruthenium Alkenyl Acetylide Complexes as a Route to Dinuclear Complexes Featuring Carbon-Rich Bridging Ligands. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00402] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Michael R. Hall
- School of Molecular Sciences, University of Western Australia, 35 Stirling Highway, 6009 Crawley, Western Australia, Australia
| | - Marcus Korb
- School of Molecular Sciences, University of Western Australia, 35 Stirling Highway, 6009 Crawley, Western Australia, Australia
| | - Stephen A. Moggach
- School of Molecular Sciences, University of Western Australia, 35 Stirling Highway, 6009 Crawley, Western Australia, Australia
| | - Paul J. Low
- School of Molecular Sciences, University of Western Australia, 35 Stirling Highway, 6009 Crawley, Western Australia, Australia
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Panda S, Baliyan R, Dhara S, Huang KW, Lahiri GK. Redox induced oxidative C-C coupling of non-innocent bis(heterocyclo)methanides. Dalton Trans 2021; 50:16647-16659. [PMID: 34755157 DOI: 10.1039/d1dt03310g] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Redox driven C-C bond formation has gained recent attention over the traditional sequence of oxidative addition, insertion and reductive elimination reactions. In this regard, the transient radical mediated diverse reactivity profile of bis(heterocyclo)methanes (H-BHM: HL1-HL4) has been demonstrated as a function of varying metal ions and ligand backbones. It highlighted the following events: (a) redox induced homocoupling of deprotonated HL1 and HL4 on coordination to M(OAc)2 precursors (M = CuII, ZnII, PdII, AgI), including the effective role of molecular oxygen in the transformation process; (b) steric inhibition of C-C coupling of HL1 or HL4 on inserting the substituent at the bridged methylene centre (Ph in HL2 or CH3 in HL3); (c) competitive C-C coupling versus oxygenation of free HL1 with varying concentrations of PdII(OAc)2 as the ease of oxygenation over dimerisation of the deprotonated HL1 was corroborated by the DFT calculated lower activation barrier and greater thermodynamic stability of the former; and (d) redox non-innocence of BHMs on a coordinatively inert ruthenium platform, which in turn favored the involvement of a radical pathway for the aforestated coupling or oxygenation process. A combined structural, spectroscopic and DFT calculated transition state analysis demonstrated the mechanistic outline for the metal assisted oxidative coupling of BHMs.
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Affiliation(s)
- Sanjib Panda
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, Powai, 400076, India. .,KAUST Catalysis Centre and Division of Chemical and Life Sciences and Engineering, KAUST, Saudi Arabia
| | - Rupal Baliyan
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, Powai, 400076, India.
| | - Suman Dhara
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, Powai, 400076, India.
| | - Kuo-Wei Huang
- KAUST Catalysis Centre and Division of Chemical and Life Sciences and Engineering, KAUST, Saudi Arabia
| | - Goutam Kumar Lahiri
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, Powai, 400076, India.
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Sowden MJ, Ward JS, Sherburn MS. Synthesis and Properties of 2,3-Diethynyl-1,3-Butadienes. Angew Chem Int Ed Engl 2020; 59:4145-4153. [PMID: 31872518 DOI: 10.1002/anie.201914807] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Indexed: 11/08/2022]
Abstract
The first general preparative access to compounds of the 2,3-diethynyl-1,3-butadiene (DEBD) class is reported. The synthesis involves a one-pot, twofold Sonogashira-type, Pd0 -catalyzed coupling of two terminal alkynes and a carbonate derivative of a 2-butyne-1,4-diol. The synthesis is broad in scope and members of this structural family are kinetically stable enough to be handled using standard laboratory techniques at ambient temperature. They decompose primarily through heat-promoted cyclodimerizations, which are impeded by alkyl substitution and accelerated by aryl or alkenyl substitution. An iterative sequence of these unprecedented Sonogashira-type couplings generates a new type of expanded dendralene. A suitably substituted DEBD carrying two terminal alkyne groups undergoes Glaser-Eglinton cyclo-oligomerization to produce a new class of expanded radialenes, which are chiral due to restricted rotation about their 1,3-butadiene units. The structural features giving rise to atropisomerism in these compounds are distinct from those reported previously.
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Affiliation(s)
- Madison J Sowden
- Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
| | - Jas S Ward
- Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
| | - Michael S Sherburn
- Research School of Chemistry, Australian National University, Canberra, ACT, 2601, Australia
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Hill AF, Manzano RA. Synthesis and reactivity of an anionic allenylidene complex. Dalton Trans 2018; 47:1412-1416. [PMID: 29327750 DOI: 10.1039/c7dt04576j] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reaction of [W([triple bond, length as m-dash]CC[triple bond, length as m-dash]CSiMe3)(CO)2(Tp*)] (Tp* = hydrotris(dimethylpyrazolyl)borate) with MeLi generates the first example of an anionic allenylidene complex Li[W([double bond, length as m-dash]C[double bond, length as m-dash]C[double bond, length as m-dash]CMeSiMe3)(CO)2(Tp*)] which reacts with electrophiles (H+, Me+) at the β-carbon to afford vinylcarbyne (allylidyne) complexes [W([triple bond, length as m-dash]CCE[double bond, length as m-dash]CMeSiMe3)(CO)2(Tp*)] (E = H, Me), and with bromine provides the unprecedented binuclear bis(carbyne) complex {C([double bond, length as m-dash]CMeSiMe3)C[triple bond, length as m-dash]W(CO)2(Tp*)}2via oxidative C-C coupling at the β-carbon.
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Affiliation(s)
- Anthony F Hill
- Research School of Chemistry, Australian National University, Canberra, Australian Capital Territory ACT 2601, Australia.
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Burgun A, Gendron F, Roisnel T, Sinbandhit S, Costuas K, Halet JF, Bruce MI, Lapinte C. Oxidative Activation of Aryldiynyl–Iron Complexes: Regioselective Dimerization. Organometallics 2013. [DOI: 10.1021/om400014g] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alexandre Burgun
- Institut des Sciences Chimiques
de Rennes, UMR CNRS
6226, Université de Rennes 1, Campus
de Beaulieu, F-35042 Rennes, France
| | - Frédéric Gendron
- Institut des Sciences Chimiques
de Rennes, UMR CNRS
6226, Université de Rennes 1, Campus
de Beaulieu, F-35042 Rennes, France
| | - Thierry Roisnel
- Institut des Sciences Chimiques
de Rennes, UMR CNRS
6226, Université de Rennes 1, Campus
de Beaulieu, F-35042 Rennes, France
| | | | - Karine Costuas
- Institut des Sciences Chimiques
de Rennes, UMR CNRS
6226, Université de Rennes 1, Campus
de Beaulieu, F-35042 Rennes, France
| | - Jean-François Halet
- Institut des Sciences Chimiques
de Rennes, UMR CNRS
6226, Université de Rennes 1, Campus
de Beaulieu, F-35042 Rennes, France
| | - Michael I. Bruce
- School of Chemistry & Physics, University of Adelaide, South Australia 5005, Australia
| | - Claude Lapinte
- Institut des Sciences Chimiques
de Rennes, UMR CNRS
6226, Université de Rennes 1, Campus
de Beaulieu, F-35042 Rennes, France
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Bruce MI, Costuas K, Gendron F, Halet JF, Jevric M, Skelton BW. Oxidative Dimerization of Aryldiynyl–Ruthenium Complexes. Organometallics 2012. [DOI: 10.1021/om3005146] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Michael I. Bruce
- School of Chemistry & Physics, University of Adelaide, South Australia 5005, Australia
| | - Karine Costuas
- Institut des Sciences Chimiques de Rennes, UMR 6226
CNRS, Université de Rennes 1, 35042
Rennes, France
| | - Frédéric Gendron
- Institut des Sciences Chimiques de Rennes, UMR 6226
CNRS, Université de Rennes 1, 35042
Rennes, France
| | - Jean-François Halet
- Institut des Sciences Chimiques de Rennes, UMR 6226
CNRS, Université de Rennes 1, 35042
Rennes, France
| | - Martyn Jevric
- School of Chemistry & Physics, University of Adelaide, South Australia 5005, Australia
| | - Brian W. Skelton
- School of Biomedical, Biomolecular & Chemical Sciences, Chemistry M313, University of Western Australia, Crawley, Western Australia 6009, Australia
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Bruce MI, Büschel S, Cole ML, Scoleri N, Skelton BW, White AH, Zaitseva NN. Some chemistry of trans-Ru(CCCCH)2(dppe)2: Syntheses of bi- and tri-metallic derivatives and cycloaddition of tcne. Inorganica Chim Acta 2012. [DOI: 10.1016/j.ica.2011.09.051] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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Coletti C, Marrone A, Re N. Metal complexes containing allenylidene and higher cumulenylidene ligands: a theoretical perspective. Acc Chem Res 2012; 45:139-49. [PMID: 21899273 DOI: 10.1021/ar200009u] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Transition metal complexes containing unsaturated carbenes have enjoyed a recent surge in research interest. In addition to showing potential as molecular wires and as components of opto-electronic materials, they provide multifaceted reactive sites for organic synthesis. In this Account, we describe results of recent theoretical studies that delineate the main features of electronic structure and bonding in allenylidenes and higher cumulenylidene complexes, [L(m)M]═C(═C)(n)═CR(1)R(2) (where L represents the ligand, M the metal, and n ≥ 1). Although free cumulenylidene ligands, :C(═C)(n)═CR(1)R(2), are extremely unstable and reactive species, they can be stabilized by coordination to a transition metal. The σ-donation of the electron lone pair on the terminal carbon atom to an empty metal d-orbital, together with the simultaneous π back-donation from filled metal d(π)-orbitals to empty cumulene π* system orbitals, leads to the formation of a strong M═C bond with multiple character. Density functional theory studies on the model systems [(CO)(5)Cr(═C)(n)CH(2)] and [trans-Cl(PH(3))(4)Ru(═C)(n)CH(2)](+) (where n = 1-9) have been useful in interpreting the structural and spectroscopic properties and the reactivity of this class of complexes. Geometry optimizations significantly contributed to the generalization of the sparse structural data available for allenylidene, butatrienylidene, and pentatetraenylidene complexes to higher cumulenylidene complexes (with up to eight carbon atoms in the chain), which show a clear structural trend. In particular, the geometries of all even-chain cumulenes are consistent with an almost purely cumulenic structure, whereas the geometries of odd-chain cumulenes present a significant polyyne-like carbon-carbon bond length alternation. The calculated bond dissociation energies (BDEs) of the cumulenylidene ligand remain almost constant on lengthening the cumulene chain. These BDEs indicate that there is no thermodynamic upper limit to the cumulene chain length and suggest that the synthetic difficulties in preparing higher cumulenylidenes are due to an increase in reactivity. The calculated charges on the carbon atoms show no significant polarization along the cumulene chain, indicating that charge distribution is not important in determining the regioselectivity of either electrophilic or nucleophilic attack, which is instead determined by frontier orbital factors. The breakdown of the contributions from the metal and the carbon atoms along the chain to the HOMO and LUMO shows that the HOMO has contributions mainly from the metal and the carbon atoms in even positions along the chain (C(2), C(4), C(6), and higher). In contrast, the LUMO has contributions mainly from the carbon atoms in odd positions along the chain (C(1), C(3), C(5), and higher), thus explaining the experimentally observed regioselectivity of electrophilic and nucleophilic attacks, which are directed, respectively, to even and odd positions of the cumulenylidene chain. The study of the electronic structure of cumulenylidenes has allowed us not only to give a consistent rationale for the main structural and spectroscopic properties and for the reactivity of this emerging class of compounds but also to predict the effect of ancillary ligands on the metal center or substituents on the carbon end. The result is a useful guide to new developments in the still-underexplored fields of this fascinating class of compounds.
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Affiliation(s)
- Cecilia Coletti
- Dipartimento Scienze del Farmaco, Università G. D’Annunzio, I-66100 Chieti, Italy
| | - Alessandro Marrone
- Dipartimento Scienze del Farmaco, Università G. D’Annunzio, I-66100 Chieti, Italy
| | - Nazzareno Re
- Dipartimento Scienze del Farmaco, Università G. D’Annunzio, I-66100 Chieti, Italy
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Bruce MI, Jevric M, Skelton BW, White AH. Dimerisation and reactivity of HCCCCFc at ruthenium centres. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2010.09.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Herndon JW. The chemistry of the carbon–transition metal double and triple bond: Annual survey covering the year 2009. Coord Chem Rev 2011. [DOI: 10.1016/j.ccr.2010.07.003] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Kovacik I, Werner H. Vinylidene and pentatetraenediyl rhodium complexes obtained from a bulky rhodium(i) dimer and a functionalized 1,3-diyne. NEW J CHEM 2011. [DOI: 10.1039/c1nj20392d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Semenov SN, Blacque O, Fox T, Venkatesan K, Berke H. [W(CO)(dppe)2] Cumulenylidene and Acetylide Complexes Accessed via Stannylated Acetylenes and Butadiynes. Organometallics 2010. [DOI: 10.1021/om100702x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Sergey N. Semenov
- Department of Inorganic Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Olivier Blacque
- Department of Inorganic Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Thomas Fox
- Department of Inorganic Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Koushik Venkatesan
- Department of Inorganic Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Heinz Berke
- Department of Inorganic Chemistry, University of Zürich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
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