1
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Musaoğlu D, Avcı Özbek H, Demirhan F. Heck coupling reactions of aryl halides catalyzed by saturated ferrocenylmethylimidazolinium salts/palladium. JOURNAL OF THE IRANIAN CHEMICAL SOCIETY 2022. [DOI: 10.1007/s13738-022-02689-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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2
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Chauhan RS, Nagar S, Chatterjee S, Goswami D, Cordes DB, Slawin AMZ, Tawde T. Synthesis of Palladium complexes derived from Amido linked N‐Heterocyclic Carbenes and their use in Suzuki cross coupling reactions. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Rohit Singh Chauhan
- Department of Chemistry K. J. Somaiya College of Science & Commerce Mumbai 400077
| | - Suryakant Nagar
- Department of Chemistry K. J. Somaiya College of Science & Commerce Mumbai 400077
| | - Sucheta Chatterjee
- Bio-Organic Division Bhabha Atomic Research Centre, Anushakti Nagar Mumbai 400094
| | - Dibakar Goswami
- Bio-Organic Division Bhabha Atomic Research Centre, Anushakti Nagar Mumbai 400094
- HomiBhabha National Institute Training School Complex, Anushakti Nagar Mumbai 400094 India
| | - David B. Cordes
- East CHEM School of Chemistry University of St Andrews St Andrews, Fife KY16 9ST
| | | | - Trupti Tawde
- Department of Chemistry K. J. Somaiya College of Science & Commerce Mumbai 400077
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3
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Seah JWK, Li Y, Pullarkat SA, Leung PH. Access to a Chiral Phosphine–NHC Palladium(II) Complex via the Asymmetric Hydrophosphination of Achiral Vinyl Azoles. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00262] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Jeffery Wee Kiong Seah
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
| | - Yongxin Li
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
| | - Sumod A. Pullarkat
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
| | - Pak-Hing Leung
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, 637371 Singapore
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4
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Honegger P, Roller A, Widhalm M. Synthesis and characterization of enantiopure planar-chiral phosphorus-linked diferrocenes. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2021; 77:152-160. [PMID: 33664166 PMCID: PMC7941264 DOI: 10.1107/s2053229621001996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/27/2020] [Accepted: 02/19/2021] [Indexed: 11/24/2022]
Abstract
Six new homochiral diferrocenyl derivatives have been synthesized, one of which is purely planar–chiral. Even if the two diferrocene subunits are identical, they are distinguished due to their positions relative to the substituents at the phosphorous prochiral centre. In the course of an ongoing synthetic project on cyclic diferrocenylphosphines, we obtained a group of planar–chiral diferrocenyl compounds useful as precursors for subsequent cyclization. Here we report the crystal structures of two symmetric compounds [(FcA)2(Ph)P], one of which contains four stereogenic centres (two C chiral and two planar chiral centres), i.e. 1,1′-(phenylphosphanediyl)bis{(2Sp)-2-[(1R)-1-(acetyloxy)ethyl]ferrocene}, [Fe2(C5H5)2(C24H25O4P)], and the other phosphine sulfide is a purely planar–chiral compound (two planar chiral centres), i.e. bis[(2Sp)--2-ethenylferrocen-1-yl]phenylphosphane sulfide, [Fe2(C5H5)2(C20H17PS)]. Owing to the stereocentres present, reactions performed on [(FcA)2(Ph)P]-type compounds strongly favour one ferrocene unit over the other due to diastereoselectivity. Furthermore, we present four related structures where the ferrocene units are not identical [(FcA)(FcB)(Ph)P]. These are {(2Sp)-2-[(1R)-1-(acetyloxy)ethyl]ferrocen-1-yl}[(2Sp)-2-ethenylferrocen-1-yl]phenyl-(S)-phosphine sulfide, [Fe2(C5H5)2(C22H21O2PS)], [(2Sp)-2-ethenylferrocen-1-yl]{(2Sp)-2-[(1R)-1-hydroxyethyl]ferrocen-1-yl}phenyl-(S)-phosphine sulfide, [Fe2(C5H5)2(C20H19OPS)], {(2Sp)-2-[(1R)-1-(acetyloxy)ethyl]ferrocen-1-yl}{(2Sp)-2-[(1R)-1-hydroxyethyl]ferrocen-1-yl}phenyl-(R)-phosphine sulfide, [Fe2(C5H5)2(C22H23O3PS)], and {(2Sp)-2-[(1R)-1-benzylamino)ethyl]ferrocen-1-yl}[(2Sp)-2-ethenylferrocen-1-yl]phenyl-(S)-phosphine sulfide, [Fe2(C5H5)2(C27H26NPS)]. All of the structures are accessible in one step from known precursors.
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Affiliation(s)
- Philipp Honegger
- Department of Computational Biological Chemistry, University of Vienna, Waehringer Strasse 17, A-1090 Vienna, Austria
| | - Alexander Roller
- Department of Inorganic Chemistry, Faculty of Chemistry, University of Vienna, Waehringer Strasse 42, A-1090 Vienna, Austria
| | - Michael Widhalm
- Department of Chemical Catalysis, Faculty of Chemistry, University of Vienna, Waehringer Strasse 38, A-1090 Vienna, Austria
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5
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Zhai Y, Xu W, Wang D, Zheng P, Zhao X, XU T. A Novel Bisoxazoline-Imidazolium Salt in Ytterbium-Catalyzed Asymmetric Reduction of Ketone. European J Org Chem 2020. [DOI: 10.1002/ejoc.202000816] [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)
- Yujie Zhai
- Shanghai Key Laboratory of Chemical Assessment and Sustainability; School of Chemical Science and Engineering; Tongji University; 1239 Siping Road 200092 Shanghai P. R. of China
| | - Wenhao Xu
- Shanghai Key Laboratory of Chemical Assessment and Sustainability; School of Chemical Science and Engineering; Tongji University; 1239 Siping Road 200092 Shanghai P. R. of China
| | - Dong Wang
- Shanghai Key Laboratory of Chemical Assessment and Sustainability; School of Chemical Science and Engineering; Tongji University; 1239 Siping Road 200092 Shanghai P. R. of China
| | - Purui Zheng
- Shanghai Key Laboratory of Chemical Assessment and Sustainability; School of Chemical Science and Engineering; Tongji University; 1239 Siping Road 200092 Shanghai P. R. of China
| | - Xiaoming Zhao
- Shanghai Key Laboratory of Chemical Assessment and Sustainability; School of Chemical Science and Engineering; Tongji University; 1239 Siping Road 200092 Shanghai P. R. of China
| | - Tao XU
- Shanghai Key Laboratory of Chemical Assessment and Sustainability; School of Chemical Science and Engineering; Tongji University; 1239 Siping Road 200092 Shanghai P. R. of China
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6
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Abstract
We describe the synthesis of planar-chiral diferrocene compounds 4, 7 and 12, intended as key precursors for a new family of asymmetric catalyst ligands with less complex structures than their popular equivalents. In contrast to conventional 1,2-disubstituted ferrocenes containing center-chiral and planar-chiral elements, these compounds are purely planar-chiral due to the absence of α-substiuted ethyl groups. The title compounds 4, 7 and 12 were obtained from known precursors in 87%, 59% and 60% yields, respectively.
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7
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Yoshida K, Yasue R. <i>N</i>-Heterocyclic Carbene Ligands Having Planar Chiral Ferrocene Structure. J SYN ORG CHEM JPN 2020. [DOI: 10.5059/yukigoseikyokaishi.78.28] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Kazuhiro Yoshida
- Department of Chemistry, Graduate School of Science, Chiba University
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8
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Chiral N-heterocyclic carbene ligands with additional chelating group(s) applied to homogeneous metal-mediated asymmetric catalysis. Coord Chem Rev 2019. [DOI: 10.1016/j.ccr.2019.05.003] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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9
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Škoch K, Schulz J, Císařová I, Štěpnička P. Pd(II) Complexes with Chelating Phosphinoferrocene Diaminocarbene Ligands: Synthesis, Characterization, and Catalytic Use in Pd-Catalyzed Borylation of Aryl Bromides. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00398] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Karel Škoch
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 128 40 Prague, Czech Republic
| | - Jiří Schulz
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 128 40 Prague, Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 128 40 Prague, Czech Republic
| | - Petr Štěpnička
- Department of Inorganic Chemistry, Faculty of Science, Charles University, Hlavova 2030, 128 40 Prague, Czech Republic
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10
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Yoshida K, Yasue R. Planar-Chiral Ferrocene-Based N-Heterocyclic Carbene Ligands. Chemistry 2018; 24:18575-18586. [PMID: 30277615 DOI: 10.1002/chem.201803903] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2018] [Indexed: 12/18/2022]
Abstract
In the last few decades, N-heterocyclic carbene (NHC) ligands, characterized by attractive features, have increased their presence in transition-metal catalysis. However, chiral NHC ligands still require further design enhancement to realize far more exciting synthetic applications. This review documents advances in chiral NHC ligands, focusing on planar-chiral ferrocene-based NHCs. As the basic shape of most classes of NHC rings is planar, it seems rational to employ a planar-chiral element in the design of chiral NHC ligands.
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Affiliation(s)
- Kazuhiro Yoshida
- Department of Chemistry, Graduate School of Science, Chiba University, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan.,Molecular Chirality Research Center, Chiba University, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan
| | - Risa Yasue
- Department of Chemistry, Graduate School of Science, Chiba University, Yayoi-cho, Inage-ku, Chiba, 263-8522, Japan
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11
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Braun C, Bräse S, Schafer LL. Planar-Chiral [2.2]Paracyclophane-Based Amides as Proligands for Titanium- and Zirconium-Catalyzed Hydroamination. European J Org Chem 2017. [DOI: 10.1002/ejoc.201700101] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Carolin Braun
- Institute of Organic Chemistry; Karlsruhe Institute of Technology (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
| | - Stefan Bräse
- Institute of Organic Chemistry; Karlsruhe Institute of Technology (KIT); Fritz-Haber-Weg 6 76131 Karlsruhe Germany
- Institute of Toxicology and Genetics; Karlsruhe Institute of Technology (KIT); Hermann-von-Helmholtz-Platz 1 76344 Eggenstein-Leopoldshafen Germany
| | - Laurel L. Schafer
- Department of Chemistry; University of British Columbia; 2036 Main Mall V6T 1Z1 Vancouver BC Canada
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12
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Zirakzadeh A, Stöger B, Kirchner K. Crystal structure of bis-{( S)-1-[2-(di-phenyl-phosphan-yl)ferrocen-yl]-( R)-eth-yl}ammonium bromide di-chloro-methane monosolvate. Acta Crystallogr E Crystallogr Commun 2017; 73:152-154. [PMID: 28217331 PMCID: PMC5290554 DOI: 10.1107/s2056989016020417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2016] [Accepted: 12/22/2016] [Indexed: 11/15/2022]
Abstract
During the synthesis of an FeBr2 complex with the PNP ligand (R,R,SFc,SFc)-[Fe2(C5H5)2(C38H35NP2)] (1), single crystals of the di-chloro-methane monosolvate of the Br- salt of the protonated ligand 1H+ were obtained serendipitously, i.e. [Fe2(C5H5)2(C38H36NP2)]Br·CH2Cl2. The crystal structure of 1H·Br·CH2Cl2 was determined by single-crystal X-ray diffraction. The mean bond lengths in the ferrocene units are Fe-C = 2.049 (3) Å and C-C = 1.422 (4) Å within the cyclo-penta-dienyl rings. The mean C-N bond length is 1.523 (4) Å. The inter-planar angle between the two connected cyclo-penta-dienyl rings is 49.2 (2)°. One ferrocene moiety adopts a staggered conformation, whereas the other is between staggered and eclipsed. The Br- ions and the CH2Cl2 mol-ecules are located in channels extending along <100>. One ammonium H atom forms a hydrogen bond with the Br- ion [H⋯Br = 2.32 (4) Å and C-H⋯Br = 172 (3)°]. The second ammonium H atom is not involved in hydrogen bonding.
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Affiliation(s)
- Afrooz Zirakzadeh
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163, A-1060 Vienna, Austria
| | - Berthold Stöger
- X-Ray Centre, TU Wien, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163, A-1060 Vienna, Austria
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13
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Bouché M, Mordan M, Kariuki BM, Coles SJ, Christensen J, Newman PD. Mono- and dimeric complexes of an asymmetric heterotopic P,CNHC,pyr ligand. Dalton Trans 2016; 45:13347-60. [PMID: 27461718 DOI: 10.1039/c6dt02476a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An asymmetric heterotopic ligand (S-N(Me)CP) containing a central bicyclic, expanded-ring NHC with one pyridyl and one phosphine exo-substituent has been synthesised and its coordination chemistry with selected late transition metals investigated. The amidinium precursor [S-N(Me)CHP]PF6 shows variable coordination modes with Ag(i), Cu(i) and Au(i) depending on the L : M ratio. The reaction of two mols of [S-N(Me)CHP]PF6 with [Cu(MeCN)4]BF4, AgBF4 or Au(THT)Cl gives the bis-ligand complexes [Cu(κ-P-N(Me)CHP)2(CH3CN)2]BF4·(PF6)2, 1, and [M(κ-P-N(Me)CHP)2]X·(PF6)2 (3: M = Ag, X = BF4; 6: M = Au, X = Cl) respectively. The 1 : 1 reaction of [S-N(Me)CHP]PF6 with AgOTf gave the head-to-tail dimer H,T-[Ag2(μ-N,P-N(Me)CHP)2(μ-OTf)2](PF6)2, 2, whereas the analogous reaction with Au(THT)Cl gave monomeric [Au(κ-P-N(Me)CHP)Cl]PF6, 5. Complex 2 was converted to H,T-[Ag2(μ-C,P-N(Me)CP)2](PF6)2, 4, upon addition of base, while 6 gave [Au(κ-C-N(Me)CP)2]Cl, 8, when treated likewise. Reaction of [S-N(Me)CHP]PF6 with Ni(1,5-COD)2 gave the oxidative addition/insertion product [Ni(κ(3)-N,C,P-N(Me)CP)(η(3)-C8H13)]PF6, 9, which converted to [Ni(κ(3)-N,C,P-N(Me)CP)Cl]PF6, 10, upon exposure of a CHCl3 solution to air. Complex 10 showed conformational isomerism that was also present in [Rh(κ(3)-N,C,P-N(Me)CP)(CO)]PF6, 14, prepared from the precursor complex [Rh(κ-P-N(Me)CHP)(acac)(CO)]PF6, 13, upon heating in C6H5Cl. [Pt(κ(3)-N,C,P-N(Me)CP)(Cl)]PF6, 12, derived from trans-[Pt(κ-P-N(Me)CHP)2(Cl)2](PF6)2, 11, was isolated as a single conformer.
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Affiliation(s)
- Mathilde Bouché
- School of Chemistry, Cardiff University, Cardiff, CF10 3AT, UK.
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14
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Trivedi M, Bhaskaran, Singh G, Kumar A, Rath NP. Silver(I) and palladium(II) complexes of new pentamethylene-functionalized bis-imidazolium dication ligands and its application in Heck and Suzuki–Miyaura coupling reaction. Inorganica Chim Acta 2016. [DOI: 10.1016/j.ica.2016.04.039] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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15
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Phelan JP, Ellman JA. Conjugate addition-enantioselective protonation reactions. Beilstein J Org Chem 2016; 12:1203-28. [PMID: 27559372 PMCID: PMC4979737 DOI: 10.3762/bjoc.12.116] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 05/31/2016] [Indexed: 12/20/2022] Open
Abstract
The addition of nucleophiles to electron-deficient alkenes represents one of the more general and commonly used strategies for the convergent assembly of more complex structures from simple precursors. In this review the addition of diverse protic and organometallic nucleophiles to electron-deficient alkenes followed by enantioselective protonation is summarized. Reactions are first categorized by the type of electron-deficient alkene and then are further classified according to whether catalysis is achieved with chiral Lewis acids, organocatalysts, or transition metals.
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Affiliation(s)
- James P Phelan
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT 06520, USA
| | - Jonathan A Ellman
- Department of Chemistry, Yale University, 225 Prospect Street, New Haven, CT 06520, USA
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16
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Yang Z, Liu D, Liu Y, Sugiya M, Imamoto T, Zhang W. Synthesis and Structural Characterization of Nickel Complexes Possessing P-Stereogenic Pincer Scaffolds and Their Application in Asymmetric Aza-Michael Reactions. Organometallics 2015. [DOI: 10.1021/om501287k] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
| | | | | | - Masashi Sugiya
- Organic R&D Department, Nippon Chemical Industrial Co., Ltd., Kameido, Koto-ku, Tokyo 136-8515, Japan
| | - Tsuneo Imamoto
- Organic R&D Department, Nippon Chemical Industrial Co., Ltd., Kameido, Koto-ku, Tokyo 136-8515, Japan
- Department
of Chemistry, Graduate School of Science, Chiba University, Yayoi-cho, Inage-ku, Chiba 263-8522, Japan
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17
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Nickel(II) complex incorporating methylene bridged tetradentate dicarbene ligand as an efficient catalyst toward CC and CN bond formation reactions. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.molcata.2014.10.031] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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18
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Das R, Hepp A, Daniliuc CG, Hahn FE. Synthesis of Complexes with Protic NH,NH-NHC Ligands via Oxidative Addition of 2-Halogenoazoles to Zero-Valent Transition Metals. Organometallics 2014. [DOI: 10.1021/om501120u] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Rajorshi Das
- Institut
für Anorganische und Analytische Chemie and NRW Graduate School
of Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse
30, D-48149 Münster, Germany
| | - Alexander Hepp
- Institut
für Anorganische und Analytische Chemie and NRW Graduate School
of Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse
30, D-48149 Münster, Germany
| | - Constantin G. Daniliuc
- Organisch-Chemisches
Institut, Westfälische Wilhelms-Universität Münster, Corrensstrasse 40, D-48149 Münster, Germany
| | - F. Ekkehardt Hahn
- Institut
für Anorganische und Analytische Chemie and NRW Graduate School
of Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse
30, D-48149 Münster, Germany
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19
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Synthesis, structure, electrochemical and antimicrobial properties of N , N ′-bis(ferrocenylmethyl)imidazolinium salts. Inorganica Chim Acta 2014. [DOI: 10.1016/j.ica.2014.08.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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20
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Bernhammer JC, Chong NX, Jothibasu R, Zhou B, Huynh HV. Palladium(II) Complexes Bearing an Indazole-Derived N-Heterocyclic Carbene and Phosphine Coligands as Catalysts for the Sonogashira Coupling and the Hydroamination of Alkynes. Organometallics 2014. [DOI: 10.1021/om500566n] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jan C. Bernhammer
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Ning Xi Chong
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Ramasamy Jothibasu
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Binbin Zhou
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
| | - Han Vinh Huynh
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543
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21
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Fuku-en SI, Yamamoto J, Kojima S, Yamamoto Y. Synthesis and Application of New Dipyrido-annulated N-Heterocyclic Carbene with Phosphorus Substituents. CHEM LETT 2014. [DOI: 10.1246/cl.131074] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Shin-ichi Fuku-en
- Department of Chemistry, Graduate School of Science, Hiroshima University
| | - Junki Yamamoto
- Department of Chemistry, Graduate School of Science, Hiroshima University
| | - Satoshi Kojima
- Department of Chemistry, Graduate School of Science, Hiroshima University
| | - Yohsuke Yamamoto
- Department of Chemistry, Graduate School of Science, Hiroshima University
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Bernhammer JC, Huynh HV. Benzimidazolin-2-ylidene Complexes of Palladium(II) Featuring a Thioether Moiety: Synthesis, Characterization, Molecular Dynamics, and Catalytic Activities. Organometallics 2014. [DOI: 10.1021/om500083r] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Jan C. Bernhammer
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
| | - Han Vinh Huynh
- Department
of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore 117543, Singapore
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23
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Das R, Daniliuc CG, Hahn FE. Oxidative Addition von 2-Halogenazolen - direkte Synthese von Palladium(II)-Komplexen mit protischen NH,NH-funktionalisierten NHC-Liganden. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201308269] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Oxidative Addition of 2-Halogenoazoles-Direct Synthesis of Palladium(II) Complexes Bearing Protic NH,NH-Functionalized NHC Ligands. Angew Chem Int Ed Engl 2013; 53:1163-6. [DOI: 10.1002/anie.201308269] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Indexed: 11/07/2022]
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25
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El-Zoghbi I, Kebdani M, Whitehorne TJJ, Schaper F. Selective and Nonselective Aza-Michael Additions Catalyzed by a Chiral Zirconium Bis-Diketiminate Complex. Organometallics 2013. [DOI: 10.1021/om400544z] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Ibrahim El-Zoghbi
- Centre in
Green Chemistry and
Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ.
Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Myriam Kebdani
- Centre in
Green Chemistry and
Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ.
Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Todd J. J. Whitehorne
- Centre in
Green Chemistry and
Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ.
Centre-Ville, Montréal, Québec H3T 3J7, Canada
| | - Frank Schaper
- Centre in
Green Chemistry and
Catalysis, Department of Chemistry, Université de Montréal, C. P. 6128 Succ.
Centre-Ville, Montréal, Québec H3T 3J7, Canada
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26
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Milosevic S, Togni A. Enantioselective 1,3-Dipolar Cycloaddition of C,N-Cyclic Azomethine Imines to Unsaturated Nitriles Catalyzed by NiII–Pigiphos. J Org Chem 2013; 78:9638-46. [DOI: 10.1021/jo401247d] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Sandra Milosevic
- Department of Chemistry and
Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Antonio Togni
- Department of Chemistry and
Applied Biosciences, Swiss Federal Institute of Technology, ETH Zürich, CH-8093 Zürich, Switzerland
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27
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Liu X, Braunstein P. Complexes with Hybrid Phosphorus-NHC Ligands: Pincer-Type Ir Hydrides, Dinuclear Ag and Ir and Tetranuclear Cu and Ag Complexes. Inorg Chem 2013; 52:7367-79. [DOI: 10.1021/ic302854t] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xianghao Liu
- Laboratoire de Chimie de
Coordination, Institut de Chimie, UMR 7177 CNRS, Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, 67081
Strasbourg Cedex, France
| | - Pierre Braunstein
- Laboratoire de Chimie de
Coordination, Institut de Chimie, UMR 7177 CNRS, Université de Strasbourg, 4 rue Blaise Pascal, CS 90032, 67081
Strasbourg Cedex, France
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28
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Gaillard S, Renaud JL. When phosphorus and NHC (N-heterocyclic carbene) meet each other. Dalton Trans 2013; 42:7255-70. [DOI: 10.1039/c2dt32789a] [Citation(s) in RCA: 120] [Impact Index Per Article: 10.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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29
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Kühnel E, Shishkov IV, Rominger F, Oeser T, Hofmann P. Synthesis and Structures of Copper(I) Complexes with Phosphino-Functionalized N-Heterocyclic Carbenes (NHCP) and Bis-N-Heterocyclic Carbenes (Bis-NHC). Organometallics 2012. [DOI: 10.1021/om300701u] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Erik Kühnel
- Organisch-Chemisches
Institut, University of Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Igor V. Shishkov
- Organisch-Chemisches
Institut, University of Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Frank Rominger
- Organisch-Chemisches
Institut, University of Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Thomas Oeser
- Organisch-Chemisches
Institut, University of Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
| | - Peter Hofmann
- Organisch-Chemisches
Institut, University of Heidelberg, Im Neuenheimer Feld 270, D-69120 Heidelberg, Germany
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30
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Siemeling U. Singlet Carbenes Derived from Ferrocene and Closely Related Sandwich Complexes. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201200443] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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31
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32
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Reitsamer C, Stallinger S, Schuh W, Kopacka H, Wurst K, Obendorf D, Peringer P. Novel access to carbodiphosphoranes in the coordination sphere of group 10 metals: template synthesis and protonation of PCP pincer carbodiphosphorane complexes of C(dppm)2. Dalton Trans 2012; 41:3503-14. [PMID: 22322243 DOI: 10.1039/c2dt11949h] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In a novel template synthesis of carbodiphosphoranes (CDPs), the phosphine functionalized CDP ligand C(dppm)(2) (dppm = Ph(2)PCH(2)PPh(2)) is formed in the coordination sphere of group 10 metals from CS(2) and 4 equivalents of dppm. The products are the PCP pincer complexes [M(Cl)(C(dppm)(2)-κ3P,C,P)]Cl (M = Ni, Pd, Pt) and 2 equivalents of dppmS. The compound C(dppm)(2), which is composed of a divalent carbon atom and two dppm subunits, represents a new PCP-type pincer ligand with the formally neutral carbon Lewis base of the CDP functionality as the central carbon. Treatment of [M(Cl)(C(dppm)(2)-κ3P,C,P)]Cl (M = Pd, Pt) with hydrochloric acid results in protonation at the CDP carbon atom and the formation of the PCP pincer complexes [M(Cl)(CH(dppm)(2)-κ3P,C,P)]Cl(2) (M = Pd, Pt). The PCP pincer ligand [CH(dppm)(2)](+) involves a formally cationic central carbon donor. The reaction of [Ni(Cl)(C(dppm)(2)-κ3P,C,P)]Cl with HCl leads to the extrusion of NiCl(2) and formation of the diprotonated CDP compound [CH(2)(dppm)(2)]Cl(2), from which the monoprotonated conjugate base [CH(dppm)(2)]Cl is obtained upon addition of bases, such as NH(3). The crystal structures of [M(Cl)(C(dppm)(2)-κ3P,C,P)]Cl (M = Ni, Pd, Pt), [Ni(Cl)(C(dppm)(2)-κ3P,C,P)](2)[NiCl(4)], [M(Cl)(CH(dppm)(2)-κ3P,C,P)]Cl(2) (M = Pd, Pt) as well as [CH(2)(dppm)(2)]Cl(2) and [CH(dppm)(2)]Cl are presented. A comparison of the solid state structures reveals interesting features, e.g. infinite supramolecular networks mediated by C-H···Cl hydrogen bond interactions and an unexpected loss of molecular symmetry upon protonation in the complexes [M(CH(dppm)(2)-κ3P,C,P)(Cl)]Cl(2) (M = Pd, Pt) as a result of the flexible ligand backbone. Additionally the new compounds were characterized comprehensively in solution by multinuclear (31)P, (13)C and (1)H NMR spectroscopy: Several spectroscopic parameters show a striking variability in particular regarding the carbodiphosphorane functionality. Furthermore the compound [Ni(Cl)(C(dppm)(2)-κ3P,C,P)]Cl was examined by cyclic voltammetry (CV) and could be shown to display quasi-reversible oxidative as well as reductive behaviour.
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Affiliation(s)
- Christian Reitsamer
- Institut für Allgemeine, Anorganische und Theoretische Chemie der Universität Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria
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33
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Sulfur-functionalized N-heterocyclic carbene complexes of Pd(II): syntheses, structures and catalytic activities. Molecules 2012; 17:2491-517. [PMID: 22382527 PMCID: PMC6268575 DOI: 10.3390/molecules17032491] [Citation(s) in RCA: 77] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2012] [Revised: 02/20/2012] [Accepted: 02/23/2012] [Indexed: 11/18/2022] Open
Abstract
N-heterocyclic carbenes (NHCs) can be easily modified by introducing functional groups at the nitrogen atoms, which leads to versatile coordination chemistry as well as diverse catalytic applications of the resulting complexes. This article summarizes our contributions to the field of NHCs bearing different types of sulfur functions, i.e., thioether, sulfoxide, thiophene, and thiolato. The experimental evidence for the truly hemilabile coordination behavior of a Pd(II) thioether-NHC complex has been reported as well. In addition, complexes bearing rigid CSC-pincer ligands have been synthesized and the reasons for pincer versus pseudo-pincer formation investigated. Incorporation of the electron-rich thiolato function resulted in the isolation of structurally diverse complexes. The catalytic activities of selected complexes have been tested in Suzuki-Miyaura, Mizoroki-Heck and hydroamination reactions.
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34
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Daran JC, Demirhan F, Yıldırım Ö, Çetinkaya B. 1-Ferrocenylmethyl-3-(2,4,6-trimethylbenzyl)-1H-imidazolidin-3-ium iodide and trans-bis(3-benzyl-1-ferrocenylmethyl-1H-imidazolidin-2-ylidene)diiodidopalladium(II). Acta Crystallogr C 2012; 68:m48-52. [PMID: 22307249 DOI: 10.1107/s0108270112000601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Accepted: 01/06/2012] [Indexed: 11/10/2022] Open
Abstract
Owing to increasing interest in the use of N-heterocyclic carbenes (NHCs) based on imidazolidinium ions as ligands in the design of highly efficient transition-metal-based homogeneous catalysts, the characterizations of the 1-ferrocenylmethyl-3-(2,4,6-trimethylbenzyl)imidazolidin-3-ium iodide salt, [Fe(C(5)H(5))(C(19)H(24)N(2))]I, (I), and the palladium complex trans-bis(3-benzyl-1-ferrocenylmethyl-1H-imidazolidin-2-ylidene)diiodidopalladium(II), [Fe(2)Pd(C(5)H(5))(2)(C(16)H(17)N(2))(2)I(2)], (II), are reported. Compound (I) has two iodide anions and two imidazolidinium cations within the asymmetric unit (Z' = 2). The two cations have distinctly different conformations, with the ferrocene groups orientated exo and endo with respect to the N-heterocyclic carbene. Weak C-H donor hydrogen bonds to both the iodide anions and the π system of the mesitylene group combine to form two-dimensional layers perpendicular to the crystallographic c direction. Only one of the formally charged imidazolidinium rings forms a near-linear hydrogen bond with an iodide anion. Complex (II) shows square-planar coordination around the Pd(II) metal, which is located on an inversion centre (Z' = 0.5). The ferrocene and benzyl substituents are in a trans-anti arrangement. The Pd-C bond distance between the N-heterocyclic carbene ligands and the metal atom is 2.036 (7) Å. A survey of related structures shows that the lengthening of the N-C bonds and the closure of the N-C-N angle seen here on metal complexation is typical of similar NHCs and their complexes.
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Affiliation(s)
- Jean-Claude Daran
- Laboratoire de Chimie de Coordination, CNRS UPR8241, 205 route de Narbonne, 31077 Toulouse, France.
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35
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Pan S, Endo K, Shibata T. Ir(I)-Catalyzed Intermolecular Regio- and Enantioselective Hydroamination of Alkenes with Heteroaromatic Amines. Org Lett 2012; 14:780-3. [DOI: 10.1021/ol203318z] [Citation(s) in RCA: 80] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shiguang Pan
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo, 169-8555, Japan, and Waseda Institute for Advanced Study, Shinjuku, Tokyo, 169-8050, Japan
| | - Kohei Endo
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo, 169-8555, Japan, and Waseda Institute for Advanced Study, Shinjuku, Tokyo, 169-8050, Japan
| | - Takanori Shibata
- Department of Chemistry and Biochemistry, School of Advanced Science and Engineering, Waseda University, Shinjuku, Tokyo, 169-8555, Japan, and Waseda Institute for Advanced Study, Shinjuku, Tokyo, 169-8050, Japan
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36
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Newman PD, Cavell KJ, Kariuki BM. Variable coordination of a chiral diphosphine containing an amidinium/NHC group within its backbone: μ-P,P′, κ2-P,P′ and κ3-P,C,P′ coordination modes. Dalton Trans 2012; 41:12395-407. [DOI: 10.1039/c2dt31475d] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Gu S, Liu B, Chen J, Wu H, Chen W. Synthesis, structures, and properties of ruthenium(ii) complexes of N-(1,10-phenanthrolin-2-yl)imidazolylidenes. Dalton Trans 2012; 41:962-70. [DOI: 10.1039/c1dt11269d] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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38
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Cabeza JA, Damonte M, García-Álvarez P, Hernández-Cruz MG, Kennedy AR. Reactivity of Phosphine- and Thioether-Tethered N-Heterocyclic Carbenes with Ruthenium Carbonyl. Organometallics 2011. [DOI: 10.1021/om200954w] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Javier A. Cabeza
- Departamento de Química
Orgánica e Inorgánica-IUQOEM, Universidad de Oviedo−-CSIC, E-33071 Oviedo, Spain
| | - Marina Damonte
- Departamento de Química
Orgánica e Inorgánica-IUQOEM, Universidad de Oviedo−-CSIC, E-33071 Oviedo, Spain
| | - Pablo García-Álvarez
- Departamento de Química
Orgánica e Inorgánica-IUQOEM, Universidad de Oviedo−-CSIC, E-33071 Oviedo, Spain
| | | | - Alan R. Kennedy
- WestCHEM, Department of Pure
and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, U.K
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39
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Cabeza JA, Damonte M, García-Álvarez P, Kennedy AR, Pérez-Carreño E. Reactivity of [Ru3(CO)12] with a Phosphine-Functionalized Imidazol-2-ylidene and Its Imidazolium Salt. Organometallics 2011. [DOI: 10.1021/om101021s] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Javier A. Cabeza
- Departamento de Química Orgánica e Inorgánica-IUQOEM, Universidad de Oviedo-CSIC, E-33071 Oviedo, Spain
| | - Marina Damonte
- Departamento de Química Orgánica e Inorgánica-IUQOEM, Universidad de Oviedo-CSIC, E-33071 Oviedo, Spain
| | - Pablo García-Álvarez
- Departamento de Química Orgánica e Inorgánica-IUQOEM, Universidad de Oviedo-CSIC, E-33071 Oviedo, Spain
| | - Alan R. Kennedy
- WestCHEM, Department of Pure and Applied Chemistry, University of Strathclyde, Glasgow G1 1XL, U.K
| | - Enrique Pérez-Carreño
- Departamento de Química Física y Analítica, Universidad de Oviedo, E-33071 Oviedo, Spain
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40
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Yuan D, Tang H, Xiao L, Huynh HV. CSC-pincer versus pseudo-pincer complexes of palladium(ii): a comparative study on complexation and catalytic activities of NHC complexes. Dalton Trans 2011; 40:8788-95. [DOI: 10.1039/c1dt10269a] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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41
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Zhang F, Song H, Zi G. Synthesis and catalytic activity of group 5 metal amides with chiral biaryldiamine-based ligands. Dalton Trans 2011; 40:1547-66. [DOI: 10.1039/c0dt01229g] [Citation(s) in RCA: 84] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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42
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Newman PD, Cavell KJ, Hallett AJ, Kariuki BM. Rhodium and iridium complexes of an asymmetric bicyclic NHC bearing secondary pyridyl donors. Dalton Trans 2011; 40:8807-13. [DOI: 10.1039/c1dt10582e] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Zi G. Asymmetric hydroamination/cyclization catalyzed by group 4 metal complexes with chiral biaryl-based ligands. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2010.07.034] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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44
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Jahnke MC, Ekkehardt Hahn F. Introduction to N-Heterocyclic Carbenes: Synthesis and Stereoelectronic Parameters. N-HETEROCYCLIC CARBENES 2010. [DOI: 10.1039/9781849732161-00001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
N-Heterocyclic carbenes (NHCs) are cyclic compounds containing a divalent carbon atom bound to at least one nitrogen atom within the heterocycle. Variation of the size of the carbene ring, the substituents on the nitrogen atoms or the additional atoms within the heterocycle lead to an array of different NHCs exhibiting a broad range of electronic properties. Their ability to act as donors and the resulting stable bounds to most transition metals make them excellent ligands in coordination chemistry. In addition, free NHCs have found applications as organocatalysts in metal free chemical transformations. In this Chapter synthetic procedures leading to different NHCs and important structural and electronic features of this class of compounds are discussed.
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Affiliation(s)
- Mareike C. Jahnke
- Institut für Anorganische und Analytische Chemie Westfälische Wilhelms-Universität Münster, Corrensstrasse 30 D-48149 Münster Germany
| | - F. Ekkehardt Hahn
- Institut für Anorganische und Analytische Chemie Westfälische Wilhelms-Universität Münster, Corrensstrasse 30 D-48149 Münster Germany
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45
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Hildebrandt B, Reiß G, Ganter C. The first structurally characterized N-heterocyclic carbene complex with a ligand derived from pyrimidine. J Organomet Chem 2010. [DOI: 10.1016/j.jorganchem.2009.10.049] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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46
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Zi G, Zhang F, Xiang L, Chen Y, Fang W, Song H. Synthesis and characterization of group 4 metal amides with new C2-symmetric binaphthyldiamine-based ligands and their use as catalysts for asymmetric hydroamination/cyclization. Dalton Trans 2010; 39:4048-61. [DOI: 10.1039/b923457h] [Citation(s) in RCA: 86] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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47
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Dash C, Shaikh MM, Butcher RJ, Ghosh P. A comparison between nickel and palladium precatalysts of 1,2,4-triazole based N-heterocyclic carbenes in hydroamination of activated olefins. Dalton Trans 2010; 39:2515-24. [DOI: 10.1039/b917892a] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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48
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Díez-González S, Marion N, Nolan SP. N-heterocyclic carbenes in late transition metal catalysis. Chem Rev 2009; 109:3612-76. [PMID: 19588961 DOI: 10.1021/cr900074m] [Citation(s) in RCA: 2580] [Impact Index Per Article: 172.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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49
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Varnado CD, Lynch VM, Bielawski CW. 1,1'-Bis(N-benzimidazolylidene)ferrocene: synthesis and study of a novel ditopic ligand and its transition metal complexes. Dalton Trans 2009:7253-61. [PMID: 20449170 DOI: 10.1039/b908696j] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Diiridum complexes containing 1,1'-bis(N-benzimidazolylidene)ferrocene, a novel ditopic ligand comprised of two N-heterocyclic carbenes (NHCs) linked directly via their N-substituents to each cyclopentadienyl ring of a ferrocene moiety, were synthesized. Crystallographic analyses of these C(2)-symmetric bimetallic complexes revealed the benzimidazolylidene moieties were intramolecularly stacked in nearly opposing orientations, effectively forming Janus-type bis(NHC) structures in the solid state. Using a variety of electrochemical techniques, the oxidation potentials of the ferrocenyl groups in these complexes were found to depend on the auxillary ligands coordinated to the Ir centers (i.e., 1,5-cyclooctadiene vs. carbonyl). Similarly, the nu(CO) of carbonyls ligated to the Ir centers varied in accord with the oxidation state of the ferrocene contained with the bis(NHC) ligand. These results suggest that the Ir and Fe centers in these complexes are electronically coupled and that the electron donating ability of the bis(NHC) ligand reported herein can be tuned electrochemically.
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Affiliation(s)
- C Daniel Varnado
- Department of Chemistry and Biochemistry, University of Texas at Austin, 1 University Station A5300, Austin, TX 78712, USA
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50
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Ho CC, Chatterjee S, Wu TL, Chan KT, Chang YW, Hsiao TH, Lee HM. Direct Arylation Mediated by Palladium Complexes with Rigid Phosphine-Functionalized N-Heterocyclic Carbenes. Organometallics 2009. [DOI: 10.1021/om900112y] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chien-Chang Ho
- Department of Chemistry, National Changhua University of Education,
Changhua 50058, Taiwan, Republic of China
| | - Sandipan Chatterjee
- Department of Chemistry, National Changhua University of Education,
Changhua 50058, Taiwan, Republic of China
| | - Tzu-Liang Wu
- Department of Chemistry, National Changhua University of Education,
Changhua 50058, Taiwan, Republic of China
| | - Kai-Ting Chan
- Department of Chemistry, National Changhua University of Education,
Changhua 50058, Taiwan, Republic of China
| | - Yu-Wei Chang
- Department of Chemistry, National Changhua University of Education,
Changhua 50058, Taiwan, Republic of China
| | - Tsun-Hung Hsiao
- Department of Chemistry, National Changhua University of Education,
Changhua 50058, Taiwan, Republic of China
| | - Hon Man Lee
- Department of Chemistry, National Changhua University of Education,
Changhua 50058, Taiwan, Republic of China
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