1
|
Sanderson HJ, Kociok-Köhn G, McMullin CL, Hintermair U. Twinned versus linked organometallics - bimetallic "half-baguette" pentalenide complexes of Rh(I). Dalton Trans 2024; 53:5881-5899. [PMID: 38446046 DOI: 10.1039/d3dt04325h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2024]
Abstract
The application of Mg[Ph4Pn] and Li·K[Ph4Pn] in transmetalation reactions to a range of Rh(I) precursors led to the formation of "half-baguette" anti-[RhI(L)n]2[μ:η5:η5Ph4Pn] (L = 1,5-cyclooctadiene, norbornadiene, ethylene; n = 1, 2) and syn-[RhI(CO)2]2[μ:η5:η5Ph4Pn] complexes as well as the related iridium complex anti-[IrI(COD)]2[μ:η5:η5Ph4Pn]. With CO exclusive syn metalation was obtained even when using mono-nuclear Rh(I) precursors, indicating an electronic preference for syn metalation. DFT analysis showed this to be the result of π overlap between the adjacent M(CO)2 units which overcompensates for dz2 repulsion of the metals, an effect which can be overridden by steric clash of the auxiliary ligands to yield anti-configuration as seen in the larger olefin complexes. syn-[RhI(CO)2]2[μ:η5:η5Ph4Pn] is a rare example of a twinned organometallic where the two metals are held flexibly in close proximity, but the two d8 Rh(I) centres did not show signs of M-M bonding interactions or exhibit Lewis basic behaviour as in some related mono-nuclear Cp complexes due to the acceptor properties of the ligands. The ligand substitution chemistry of syn-[RhI(CO)2]2[μ:η5:η5Ph4Pn] was investigated with a series of electronically and sterically diverse donor ligands (P(OPh)3, P(OMe)3, PPh3, PMe3, dppe) yielding new mono- and bis-substituted complexes, with E-syn-[RhI(CO)(P{OR})3]2[μ:η5:η5Ph4Pn] (R = Me, Ph) characterised by XRD.
Collapse
Affiliation(s)
- Hugh J Sanderson
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
| | - Gabriele Kociok-Köhn
- Material and Chemical Characterisation Facility, University of Bath, Claverton Down, Bath BA2 7AY, UK
| | - Claire L McMullin
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
| | - Ulrich Hintermair
- Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK.
- Institute for Sustainability, University of Bath, Claverton Down, Bath, BA2 7AY, UK
| |
Collapse
|
2
|
Werra JA, Wurst K, Löwe P, Dielmann F. Facile One-Step Access to Pyrrole-Based 1,4-Diphosphabarrelenes. Chempluschem 2023; 88:e202200458. [PMID: 36727496 DOI: 10.1002/cplu.202200458] [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: 12/22/2022] [Revised: 02/01/2023] [Accepted: 02/02/2023] [Indexed: 02/03/2023]
Abstract
1,4-Diphosphabarrelenes are bicyclic diphosphines relevant, for example, for the generation of polymetallic coordination compounds. However, current synthetic protocols either suffer from low yields or require multiple reaction steps. Herein, we report the one-step synthesis of pyrrole-based 1,4-diphosphabarrelenes that are obtained in very good yields from the reaction of 1,2,5-trimethylpyrrole with 1,2-bis(dichlorophosphino)ethane or 1,2-bis(dichlorophosphino)benzene. The new caged diphosphines are strong donor ligands and act as bridging ligand in nickel(0), rhodium(I), iridium(I) and copper(I) coordination compounds.
Collapse
Affiliation(s)
- Janina A Werra
- Institute of General, Inorganic and Theoretical Chemistry, Leopold-Franzens-Universität Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria.,Institute of Inorganic and Analytical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 28/30, 48149, Münster, Germany
| | - Klaus Wurst
- Institute of General, Inorganic and Theoretical Chemistry, Leopold-Franzens-Universität Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria
| | - Pawel Löwe
- Institute of Inorganic and Analytical Chemistry, Westfälische Wilhelms-Universität Münster, Corrensstrasse 28/30, 48149, Münster, Germany
| | - Fabian Dielmann
- Institute of General, Inorganic and Theoretical Chemistry, Leopold-Franzens-Universität Innsbruck, Innrain 80-82, 6020, Innsbruck, Austria
| |
Collapse
|
3
|
Jung HJ, Nyamayaro K, Baalbaki HA, Goonesinghe C, Mehrkhodavandi P. Cooperative Initiation in a Dinuclear Indium Complex for CO 2 Epoxide Copolymerization. Inorg Chem 2023; 62:1968-1977. [PMID: 36688644 DOI: 10.1021/acs.inorgchem.2c03192] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Dinuclear indium complexes have been synthesized and characterized. These include neutral and cationic indium complexes supported by a Schiff base ligand bearing a binaphthol linker. The new compounds were investigated for alternating copolymerization of CO2 and cyclohexene oxide. In particular, the neutral indium chloride complex (±)-[(ONapNiN)InCl2]2 (4) showed high conversion of cyclohexene oxide and selectivity for poly(cyclohexene carbonate) formation without cocatalysts at 80 °C under various CO2 pressures (2-30 bar). Importantly, the reactivity of the dinuclear indium chloride complex 4 is drastically different from that of the mononuclear indium chloride complex (±)-(NNiOtBu)InCl2 (5), suggesting a cooperative initiation mechanism involving the two indium centers in 4.
Collapse
Affiliation(s)
- Hyuk-Joon Jung
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| | - Kudzanai Nyamayaro
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| | - Hassan A Baalbaki
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| | - Chatura Goonesinghe
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| | - Parisa Mehrkhodavandi
- Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver V6T 1Z1, British Columbia, Canada
| |
Collapse
|
4
|
Lam RH, Keaveney ST, Messerle BA, Pernik I. Bimetallic Rhodium Complexes: Precatalyst Activation-Triggered Bimetallic Enhancement for the Hydrosilylation Transformation. ACS Catal 2023. [DOI: 10.1021/acscatal.2c04388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Raphael H. Lam
- School of Natural Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
| | - Sinead T. Keaveney
- School of Chemistry and Molecular Bioscience, University of Wollongong, Wollongong, New South Wales 2522, Australia
| | - Barbara A. Messerle
- School of Natural Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
- School of Chemistry, The University of New South Wales, Sydney, New South Wales 2052, Australia
| | - Indrek Pernik
- School of Natural Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
- School of Chemistry, The University of Sydney, Sydney, New South Wales 2006, Australia
| |
Collapse
|
5
|
|
6
|
Maity R, Birenheide BS, Breher F, Sarkar B. Cooperative Effects in Multimetallic Complexes Applied in Catalysis. ChemCatChem 2021. [DOI: 10.1002/cctc.202001951] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Ramananda Maity
- Department of Chemistry University of Calcutta 92, A. P. C. Road Kolkata 700009 India
| | - Bernhard S. Birenheide
- Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT) Engesserstr. 15 76131 Karlsruhe Germany
| | - Frank Breher
- Institute of Inorganic Chemistry Karlsruhe Institute of Technology (KIT) Engesserstr. 15 76131 Karlsruhe Germany
| | - Biprajit Sarkar
- Lehrstuhl für Anorganische Koordinationschemie Institut für Anorganische Chemie Universität Stuttgart Pfaffenwaldring 55 D 70569 Stuttgart Germany
| |
Collapse
|
7
|
Sato Y, Kawata Y, Yasui S, Kayaki Y, Ikariya T. New Bifunctional Bis(azairidacycle) with Axial Chirality via Double Cyclometalation of 2,2'-Bis(aminomethyl)-1,1'-binaphthyl. Molecules 2021; 26:molecules26041165. [PMID: 33671758 PMCID: PMC7926664 DOI: 10.3390/molecules26041165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2021] [Revised: 02/16/2021] [Accepted: 02/18/2021] [Indexed: 11/21/2022] Open
Abstract
As a candidate for bifunctional asymmetric catalysts containing a half-sandwich C–N chelating Ir(III) framework (azairidacycle), a dinuclear Ir complex with an axially chiral linkage is newly designed. An expedient synthesis of chiral 2,2′-bis(aminomethyl)-1,1′-binaphthyl (1) from 1,1-bi-2-naphthol (BINOL) was accomplished by a three-step process involving nickel-catalyzed cyanation and subsequent reduction with Raney-Ni and KBH4. The reaction of (S)-1 with an equimolar amount of [IrCl2Cp*]2 (Cp* = η5–C5(CH3)5) in the presence of sodium acetate in acetonitrile at 80 °C gave a diastereomeric mixture of new dinuclear dichloridodiiridium complexes (5) through the double C–H bond cleavage, as confirmed by 1H NMR spectroscopy. A loss of the central chirality on the Ir centers of 5 was demonstrated by treatment with KOC(CH3)3 to generate the corresponding 16e amidoiridium complex 6. The following hydrogen transfer from 2-propanol to 6 provided diastereomers of hydrido(amine)iridium retaining the bis(azairidacycle) architecture. The dinuclear chlorido(amine)iridium 5 can serve as a catalyst precursor for the asymmetric transfer hydrogenation of acetophenone with a substrate to a catalyst ratio of 200 in the presence of KOC(CH3)3 in 2-propanol, leading to (S)-1-phenylethanol with up to an enantiomeric excess (ee) of 67%.
Collapse
Affiliation(s)
- Yasuhiro Sato
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan; (Y.S.); (Y.K.); (S.Y.)
- Hazardous Materials Laboratory, Research and Development Division, National Research Institute of Fire and Disaster, Jindaiji-higashimachi 4-35-3, Chofu, Tokyo 182-8508, Japan
| | - Yuichi Kawata
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan; (Y.S.); (Y.K.); (S.Y.)
| | - Shungo Yasui
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan; (Y.S.); (Y.K.); (S.Y.)
| | - Yoshihito Kayaki
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan; (Y.S.); (Y.K.); (S.Y.)
- Correspondence: ; Tel.: +81-3-5734-2881
| | - Takao Ikariya
- Department of Chemical Science and Engineering, School of Materials and Chemical Technology, Tokyo Institute of Technology, 2-12-1-E4-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan; (Y.S.); (Y.K.); (S.Y.)
| |
Collapse
|
8
|
Tandem α/β-alkylation and transfer hydrogenation by heterodimetallic ruthenium-iridium complex. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119796] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
9
|
Zhang Y, Chen ZN, Zhang X, Deng X, Zhuang W, Su W. Iodide-enhanced palladium catalysis via formation of iodide-bridged binuclear palladium complex. Commun Chem 2020; 3:41. [PMID: 36703411 PMCID: PMC9814094 DOI: 10.1038/s42004-020-0287-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2019] [Accepted: 02/18/2020] [Indexed: 01/29/2023] Open
Abstract
The prevalence of metalloenzymes with multinuclear metal complexes in their active sites inspires chemists' interest in the development of multinuclear catalysts. Studies in this area commonly focus on binuclear catalysts containing either metal-metal bond or electronically discrete, conformationally advantageous metal centres connected by multidentate ligands, while in many multinuclear metalloenzymes the metal centres are bridged through μ2-ligands without a metal-metal bond. We report herein a μ2-iodide-bridged binuclear palladium catalyst which accelerates the C-H nitrosation/annulation reaction and significantly enhances its yield compared with palladium acetate catalyst. The superior activity of this binuclear palladium catalyst is attributed to the trans effect-relay through the iodide bridge from one palladium sphere to the other palladium sphere, which facilitates dissociation of the stable six-membered chelating ring in palladium intermediate and accelerates the catalytic cycle. Such a trans effect-relay represents a bimetallic cooperation mode and may open an avenue to design and develop multinuclear catalysts.
Collapse
Affiliation(s)
- Yuanfei Zhang
- grid.9227.e0000000119573309State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002 PR China
| | - Zhe-Ning Chen
- grid.9227.e0000000119573309State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002 PR China
| | - Xiaofeng Zhang
- grid.9227.e0000000119573309State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002 PR China
| | - Xi Deng
- grid.9227.e0000000119573309State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002 PR China
| | - Wei Zhuang
- grid.9227.e0000000119573309State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002 PR China
| | - Weiping Su
- grid.9227.e0000000119573309State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 155 Yangqiao Road West, Fuzhou, 350002 PR China ,grid.9227.e0000000119573309Center for Excellence in Molecular Synthesis, Chinese Academy of Sciences, Shanghai, 200032 PR China
| |
Collapse
|
10
|
Barry KL, Grimmer CD, Munro OQ, Akerman MP. Self-assembled supramolecular structures of O, N, N' tridentate imidazole-phenol Schiff base compounds. RSC Adv 2020; 10:7867-7878. [PMID: 35492155 PMCID: PMC9049879 DOI: 10.1039/c9ra10488g] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2019] [Accepted: 02/16/2020] [Indexed: 01/25/2023] Open
Abstract
Three imidazole-derived Schiff base compounds comprising an N-methyl imidazole group coupled to a phenol ring through an imine bond were synthesised. The structures differ by the substituent on the phenol ring at the 4-position: methyl (1), tert-butyl (2) and hydrogen (3). The compounds were synthesised using both a traditional reflux in solvent as well as an environmentally friendly solid-state reaction. Compounds (1)–(3) as well as the hemihydrate of (3) were all studied by single crystal X-ray diffraction. The asymmetric unit of compound (1) consists of two nominally planar molecules linked by hydrogen bonds to form a dimeric supramolecular structure. This dimeric structure was ubiquitous for the anhydrous forms of (1)–(3). The complementary hydrogen bonding motif between the imidazole N atoms and the phenol OH results in a stable 16-membered hydrogen-bonded ring. The asymmetric unit of (3) comprises two symmetry-independent molecules one of which has co-planar imidazole and phenol rings while the other shows a significantly oblique orientation. The hemihydrate of (3) similarly forms extensive hydrogen bonds, though in the form of a water-bridged dimeric structure. The hydrogen bond lengths (D⋯A) for compounds (1)–(3) are relatively short, ranging from 2.662(1) to 2.688(1) Å. DFT was used to understand the relative stability of the monomeric and dimeric species. These showed the hydrogen-bonded supramolecular structures were ca. 101 kJ mol−1 lower in energy than the non-interacting monomers. Scan simulations were used to calculate the total energy of the molecule as a function of phenyl ring rotation and showed why the expected planar configuration for a conjugated π-system was not observed experimentally. The barrier to rotation was found to be relatively low, 7.97(6) kJ mol−1, with the lowest energy conformations subtending dihedral angles of 22.319, 24.265 and 25.319° for molecules (1), (2) and (3), respectively. The electrostatic potential maps are able to succinctly explain the stability of the hydrogen bonds through the partial charges of the interacting atoms. TD-DFT simulations and analysis of the simulated and experimental UV/visible spectra suggest that the dimeric supramolecular structure is a stable species in solution. This was confirmed through 1H NMR titrations and an equilibrium constant of 0.16(5) M−1 was estimated. Three imidazole-derived Schiff base compounds comprising an N-methyl imidazole group coupled to a phenol ring through an imine bond were synthesised. The solid state and solution state supramolecular structures as well as energetics are explored.![]()
Collapse
Affiliation(s)
- Kristy-Lyn Barry
- School of Chemistry and Physics, University of KwaZulu-Natal Private Bag X01, Scottsville Pietermaritzburg 3209 South Africa
| | - Craig D Grimmer
- School of Chemistry and Physics, University of KwaZulu-Natal Private Bag X01, Scottsville Pietermaritzburg 3209 South Africa
| | - Orde Q Munro
- Molecular Sciences Institute, School of Chemistry, WITS University Johannesburg South Africa
| | - Matthew P Akerman
- School of Chemistry and Physics, University of KwaZulu-Natal Private Bag X01, Scottsville Pietermaritzburg 3209 South Africa
| |
Collapse
|
11
|
Xiong N, Zhang G, Sun X, Zeng R. Metal‐Metal Cooperation in Dinucleating Complexes Involving Late Transition Metals Directed towards Organic Catalysis. CHINESE J CHEM 2020. [DOI: 10.1002/cjoc.201900371] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Ni Xiong
- Department of ChemistrySchool of Science, Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University Xi'an Shaanxi 710049 China
| | - Guoxiang Zhang
- Department of ChemistrySchool of Science, Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University Xi'an Shaanxi 710049 China
| | - Xiaolong Sun
- The Key Laboratory of Biomedical Information Engineering of Ministry of Education, School of Life Science and TechnologyXi'an Jiaotong University Xi'an Shaanxi 710049 China
| | - Rong Zeng
- Department of ChemistrySchool of Science, Xi'an Key Laboratory of Sustainable Energy Materials Chemistry, Xi'an Jiaotong University Xi'an Shaanxi 710049 China
| |
Collapse
|
12
|
Visbal R, Herrera RP, Gimeno MC. Thiolate Bridged Gold(I)–NHC Catalysts: New Approach for Catalyst Design and its Application to Trapping Catalytic Intermediates. Chemistry 2019; 25:15837-15845. [DOI: 10.1002/chem.201903494] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2019] [Revised: 09/16/2019] [Indexed: 11/08/2022]
Affiliation(s)
- Renso Visbal
- Departamento de Química InorgánicaInstituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza C/ Pedro Cerbuna 12 50009 Zaragoza Spain
- Departamento de QuímicaFacultad de Ciencias Naturales y Exactas, Universidad del Valle, A.A. 25360 Cali Colombia
| | - Raquel P. Herrera
- Departamento de Química Orgánica, Laboratorio de Organocatálisis AsimétricaInstituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - M. Concepción Gimeno
- Departamento de Química InorgánicaInstituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC-Universidad de Zaragoza C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| |
Collapse
|
13
|
Butler PWV, Ward JS. The Synthesis of Quinoline-based Tin Complexes with Pendant Schiff Bases. Z Anorg Allg Chem 2019. [DOI: 10.1002/zaac.201900063] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Patrick W. V. Butler
- Research School of Chemistry; Australian National University; Canberra, ACT Australia
| | - Jas S. Ward
- Research School of Chemistry; Australian National University; Canberra, ACT Australia
- Department of Chemistry, Nanoscience Center; University of Jyvaskyla; 40014 Jyvaskyla Finland
| |
Collapse
|
14
|
Fong CW, Yu HY, Gros CP, Chan KS. Hydrogenolysis of carbon–carbon σ-bonds using water catalysed by semi-rigid diiridium( iii) porphyrins. NEW J CHEM 2019. [DOI: 10.1039/c8nj05664a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Semi-rigid diiridium(iii) porphyrins alkyls with m-xylyl and p-xylyl diether linkers were synthesized. They were found to be catalysts for the carbon–carbon σ-bond hydrogenolysis of [2.2]paracyclophane in neutral conditions using water as the hydrogen source.
Collapse
Affiliation(s)
- Ching Wai Fong
- Department of Chemistry
- The Chinese University of Hong Kong
- New Territories
- People's Republic of China
| | - Ho Yin Yu
- Department of Chemistry
- The Chinese University of Hong Kong
- New Territories
- People's Republic of China
| | - Claude P. Gros
- ICMUB (UMR CNRS 6302)
- Université de Bourgogne Franche-Comté
- 21 000 Dijon
- France
| | - Kin Shing Chan
- Department of Chemistry
- The Chinese University of Hong Kong
- New Territories
- People's Republic of China
| |
Collapse
|
15
|
Günnaz S, Gökçe AG, Türkmen H. Synthesis of bimetallic complexes bridged by 2,6-bis(benzimidazol-2-yl) pyridine derivatives and their catalytic properties in transfer hydrogenation. Dalton Trans 2018; 47:17317-17328. [PMID: 30475380 DOI: 10.1039/c8dt03178a] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
A series of binuclear rhodium(i) and iridium(i) complexes with 2,6-bis(benzimidazol-2-yl) pyridine (bzimpy) derivatives were synthesized and characterized by elemental analysis and spectroscopic methods. The molecular and crystal structures of complex 3d were determined by the single crystal X-ray diffraction technique. Their monometallic analogues were prepared to compare the catalytic properties of the bimetallic complexes. To determine the catalyst properties that result in a cooperative, bimetallic enhancement of the reaction rate, the systematic variation of the intermetallic distance and the ligand donor properties of the bimetallic complexes were explored based on the transfer hydrogenation reactions of ketones.
Collapse
Affiliation(s)
- Salih Günnaz
- Ege University, Department of Chemistry, 35100 Izmir, Turkey.
| | | | - Hayati Türkmen
- Ege University, Department of Chemistry, 35100 Izmir, Turkey.
| |
Collapse
|
16
|
Binding SC, Pernik I, Gonçales VR, Wong CM, Webster RF, Cheong S, Tilley RD, Garcia-Bennett AE, Gooding JJ, Messerle BA. Simultaneous Functionalization of Carbon Surfaces with Rhodium and Iridium Organometallic Complexes: Hybrid Bimetallic Catalysts for Hydroamination. Organometallics 2018. [DOI: 10.1021/acs.organomet.8b00726] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Samantha C. Binding
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
| | - Indrek Pernik
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
| | | | - Chin M. Wong
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
| | | | | | | | - Alfonso E. Garcia-Bennett
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
| | | | - Barbara A. Messerle
- Department of Chemistry and Biomolecular Sciences, Macquarie University, Sydney, New South Wales 2109, Australia
| |
Collapse
|
17
|
Matsinha LC, Makhubela BCE. Synthesis, characterization and evaluation of heterobimetallic Fe(II)/Rh(I) and Fe(II)/Ru(II) complexes as catalyst precursors for hydroformylation of 1-octene. J COORD CHEM 2018. [DOI: 10.1080/00958972.2018.1535111] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Affiliation(s)
- Leah C. Matsinha
- Department of Chemistry, University of Johannesburg, Auckland Park, South Africa
| | | |
Collapse
|
18
|
Synthesis of Rh(I) alkylated-PTA complexes as catalyst precursors in the aqueous-biphasic hydroformylation of 1-octene. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.05.019] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
19
|
Sung S, Ang A, Hill AF, Ma C, Kong RY, Ward JS, Young RD. Bimetallic Complexes of Group 8, 9, and 11 Metals Bridged by RB(NCH
2
PPh
2
)
2
C
6
H
4
(R = H, 4‐C
6
H
4
X; X = H, Me, F) Ligands. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800448] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Simon Sung
- Department of Chemistry National University of Singapore 12 Science Drive 2 117549 Singapore Singapore
| | - Angelina Ang
- Department of Chemistry National University of Singapore 12 Science Drive 2 117549 Singapore Singapore
| | - Anthony F. Hill
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Chenxi Ma
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Richard Y. Kong
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Jas S. Ward
- Research School of Chemistry Australian National University 2601 Canberra Australia
| | - Rowan D. Young
- Department of Chemistry National University of Singapore 12 Science Drive 2 117549 Singapore Singapore
| |
Collapse
|
20
|
Gatus MRD, Bhadbhade M, Messerle BA. Highly versatile heteroditopic ligand scaffolds for accommodating group 8, 9 & 11 heterobimetallic complexes. Dalton Trans 2017; 46:14406-14419. [PMID: 29034915 DOI: 10.1039/c7dt02854g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Two highly versatile xanthene scaffolds containing pairs of heteroditopic ligands were found to be capable of accommodating a range of transition metal ions, including Au(i), Ir(i), Ir(iii), Rh(i), and Ru(ii) to generate an array of heterobimetallic complexes. The metal complexes were fully characterised and proved to be stable in the solid and solution state, with no observed metal-metal scrambling. Heterobimetallic complexes containing the Rh(i)/Ir(i) combinations were tested as catalysts for the two-step dihydroalkoxylation reaction of alkynediols and sequential hydroamination/hydrosilylation reaction of alkynamines.
Collapse
Affiliation(s)
- Mark R D Gatus
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | | | | |
Collapse
|
21
|
Govender P, Ngubane S, Therrien B, Smith GS. Monometallic and mixed-valence bimetallic Rh(I/III) complexes: Synthesis, structure, electrochemistry and application in 1-octene hydroformylation. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.07.037] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
22
|
Liu H, Fridman N, Tamm M, Eisen MS. Catalytic Addition of Alcohols to Carbodiimides Mediated by Benzimidazolin-2-iminato Actinide Complexes. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00432] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Heng Liu
- Schulich
Faculty of Chemistry, Technion − Israel Institute of Technology, Haifa City 32000, Israel
| | - Natalia Fridman
- Schulich
Faculty of Chemistry, Technion − Israel Institute of Technology, Haifa City 32000, Israel
| | - Matthias Tamm
- Institut
für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
| | - Moris S. Eisen
- Schulich
Faculty of Chemistry, Technion − Israel Institute of Technology, Haifa City 32000, Israel
| |
Collapse
|
23
|
Gatus MRD, McBurney RT, Bhadbhade M, Messerle BA. Enhancements in catalytic reactivity and selectivity of homobimetallic complexes containing heteroditopic ligands. Dalton Trans 2017; 46:7457-7466. [PMID: 28561096 DOI: 10.1039/c7dt01294b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Rh(i) and Ir(i) homobimetallic complexes were synthesised using a heteroditopic ligand system on a xanthene scaffold containing a monodentate N-heterocyclic carbene ligand and a bidentate bis(pyrazol-1-yl)methane ligand. The complexes were tested as catalysts for the two-step dihydroalkoxylation and two-step hydroamination/hydrosilylation reactions. This is the first known report of an organometallic group 9 complex, Ir(i) bimetallic complex, 13, to selectively favour the opposite spirocyclisation product from that reported in the literature, 14cvs.14b. The Ir(i) homobimetallic complex catalyses the intramolecular hydroamination reaction of alkynamines efficiently and proved to be a highly active catalyst for promoting the subsequent hydrosilylation of the pyrrolines; completing the hydrosilylation reactions in less than 40 seconds. A chloro-bridged bimetallic species was observed in the solid state, revealing that the COD co-ligands present underwent an oxidation.
Collapse
Affiliation(s)
- Mark R D Gatus
- School of Chemistry, University of New South Wales, Sydney, NSW 2052, Australia
| | | | | | | |
Collapse
|
24
|
Liu Z, Guo J, Song C, Hu W, Dang Y, Wang ZX. The Origins of the Differences between Alkyne Hydroalkoxylations Catalyzed by 8-Quinolinolato- and Dipyrrinato-Ligated RhI
Complexes: A DFT Mechanistic Study. Eur J Inorg Chem 2017. [DOI: 10.1002/ejic.201700181] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Zheyuan Liu
- Department of Chemistry; Tianjin Key Laboratory of Molecular Optoelectronic Sciences; Tianjin University; and Collaborative Innovation Center of Chemical Science and Engineering; 300072 Tianjin China
- School of Chemistry and Chemical Engineering; University of the Chinese Academy of Sciences; 100049 Beijing China
| | - Jiandong Guo
- School of Chemistry and Chemical Engineering; University of the Chinese Academy of Sciences; 100049 Beijing China
| | - Chunyu Song
- School of Chemistry and Chemical Engineering; University of the Chinese Academy of Sciences; 100049 Beijing China
| | - Wenping Hu
- Department of Chemistry; Tianjin Key Laboratory of Molecular Optoelectronic Sciences; Tianjin University; and Collaborative Innovation Center of Chemical Science and Engineering; 300072 Tianjin China
| | - Yanfeng Dang
- Department of Chemistry; Tianjin Key Laboratory of Molecular Optoelectronic Sciences; Tianjin University; and Collaborative Innovation Center of Chemical Science and Engineering; 300072 Tianjin China
- School of Chemistry and Chemical Engineering; University of the Chinese Academy of Sciences; 100049 Beijing China
| | - Zhi-Xiang Wang
- School of Chemistry and Chemical Engineering; University of the Chinese Academy of Sciences; 100049 Beijing China
| |
Collapse
|
25
|
|
26
|
Schmidt M, Görls H, Plass W. Facile high-yield synthesis of unsymmetric end-off compartmental double Schiff-base ligands: easy access to mononuclear precursor and unsymmetric dinuclear complexes. RSC Adv 2016. [DOI: 10.1039/c6ra16870a] [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] Open
Abstract
Novel approach to unsymmetric end-off compartmental ligands with a selective high-yield synthesis and access to unsymmetric dinuclear complexes.
Collapse
Affiliation(s)
- Markus Schmidt
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Helmar Görls
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| | - Winfried Plass
- Institut für Anorganische und Analytische Chemie
- Friedrich-Schiller-Universität Jena
- 07743 Jena
- Germany
| |
Collapse
|
27
|
Diachenko V, Page MJ, Gatus MRD, Bhadbhade M, Messerle BA. Bimetallic N-Heterocyclic Carbene Rh(I) Complexes: Probing the Cooperative Effect for the Catalyzed Hydroelementation of Alkynes. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00594] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Vera Diachenko
- School of Chemistry and ‡Mark
Wainwright Analytical
Centre, University of New South Wales, Sydney, Kensington, New
South Wales 2051, Australia
| | - Michael J. Page
- School of Chemistry and ‡Mark
Wainwright Analytical
Centre, University of New South Wales, Sydney, Kensington, New
South Wales 2051, Australia
| | - Mark R. D. Gatus
- School of Chemistry and ‡Mark
Wainwright Analytical
Centre, University of New South Wales, Sydney, Kensington, New
South Wales 2051, Australia
| | - Mohan Bhadbhade
- School of Chemistry and ‡Mark
Wainwright Analytical
Centre, University of New South Wales, Sydney, Kensington, New
South Wales 2051, Australia
| | - Barbara A. Messerle
- School of Chemistry and ‡Mark
Wainwright Analytical
Centre, University of New South Wales, Sydney, Kensington, New
South Wales 2051, Australia
| |
Collapse
|
28
|
Lam RH, Walker DB, Tucker MH, Gatus MRD, Bhadbhade M, Messerle BA. Intermolecular Hydroalkoxylation of Terminal Alkynes Catalyzed by a Dipyrrinato Rhodium(I) Complex with Unusual Selectivity. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00561] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Raphael H. Lam
- School
of Chemistry, The University of New South Wales, Sydney 2052, Australia
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, 2109, Australia
| | - D. Barney Walker
- School
of Chemistry, The University of New South Wales, Sydney 2052, Australia
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, 2109, Australia
| | - Matthew H. Tucker
- School
of Chemistry, The University of New South Wales, Sydney 2052, Australia
| | - Mark R. D. Gatus
- School
of Chemistry, The University of New South Wales, Sydney 2052, Australia
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, 2109, Australia
| | - Mohan Bhadbhade
- Mark
Wainwright Analytical Centre, The University of New South Wales, Sydney 2052, Australia
| | - Barbara A. Messerle
- School
of Chemistry, The University of New South Wales, Sydney 2052, Australia
- Department
of Chemistry and Biomolecular Sciences, Macquarie University, North Ryde, 2109, Australia
| |
Collapse
|
29
|
Karunananda MK, Parmelee SR, Waldhart GW, Mankad NP. Experimental and Computational Characterization of the Transition State for C–X Bimetallic Oxidative Addition at a Cu–Fe Reaction Center. Organometallics 2015. [DOI: 10.1021/acs.organomet.5b00476] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Malkanthi K. Karunananda
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607, United States
| | - Sean R. Parmelee
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607, United States
| | - Greyson W. Waldhart
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607, United States
| | - Neal P. Mankad
- Department of Chemistry, University of Illinois at Chicago, 845 W. Taylor Street, Chicago, Illinois 60607, United States
| |
Collapse
|
30
|
Parmelee SR, Mazzacano TJ, Zhu Y, Mankad NP, Keith JA. A Heterobimetallic Mechanism for C–H Borylation Elucidated from Experimental and Computational Data. ACS Catal 2015. [DOI: 10.1021/acscatal.5b00275] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Sean R. Parmelee
- Department
of Chemistry, University of Illinois at Chicago, 845 West Taylor
Street, Chicago, Illinois 60607, United States
| | - Thomas J. Mazzacano
- Department
of Chemistry, University of Illinois at Chicago, 845 West Taylor
Street, Chicago, Illinois 60607, United States
| | - Yaqun Zhu
- Department of Chemical & Petroleum Engineering, University of Pittsburgh, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
| | - Neal P. Mankad
- Department
of Chemistry, University of Illinois at Chicago, 845 West Taylor
Street, Chicago, Illinois 60607, United States
| | - John A. Keith
- Department of Chemical & Petroleum Engineering, University of Pittsburgh, 3700 O’Hara Street, Pittsburgh, Pennsylvania 15261, United States
| |
Collapse
|
31
|
|
32
|
McCready MS, Puddephatt RJ. The Platinum Center is a Stronger Nucleophile than the Free Nitrogen Donors in a Dimethylplatinum Complex with a Dipyridylpyridazine Ligand. Organometallics 2014. [DOI: 10.1021/om501023r] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Matthew S. McCready
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7
| | - Richard J. Puddephatt
- Department of Chemistry, University of Western Ontario, London, Ontario, Canada N6A 5B7
| |
Collapse
|
33
|
Timpa SD, Pell CJ, Zhou J, Ozerov OV. Fate of Aryl/Amido Complexes of Rhodium(III) Supported by a POCOP Pincer Ligand: C–N Reductive Elimination, β-Hydrogen Elimination, and Relevance to Catalysis. Organometallics 2014. [DOI: 10.1021/om500577w] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Samuel D. Timpa
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Christopher J. Pell
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Jia Zhou
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| | - Oleg V. Ozerov
- Department of Chemistry, Texas A&M University, 3255 TAMU, College Station, Texas 77842, United States
| |
Collapse
|
34
|
Karunananda MK, Vázquez FX, Alp EE, Bi W, Chattopadhyay S, Shibata T, Mankad NP. Experimental determination of redox cooperativity and electronic structures in catalytically active Cu–Fe and Zn–Fe heterobimetallic complexes. Dalton Trans 2014; 43:13661-71. [DOI: 10.1039/c4dt01841a] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
35
|
Vuong KQ, Wong CM, Bhadbhade M, Messerle BA. Bi- and tri-metallic Rh and Ir complexes containing click derived bis- and tris-(pyrazolyl-1,2,3-triazolyl) N-N' donor ligands and their application as catalysts for the dihydroalkoxylation of alkynes. Dalton Trans 2014; 43:7540-53. [PMID: 24699761 DOI: 10.1039/c3dt53295j] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of bi-topic and tri-topic pyrazolyl-1,2,3-triazolyl donor ligands (; = 1,X-bis((4-((1H-pyrazol-1-yl)methyl)-1H-1,2,3-triazol-1-yl)methyl)benzene (X = 2, 3 and 4; o-C6H4(PyT)2, m-C6H4(PyT)2 and p-C6H4(PyT)2) and = 1,3,5-tris((4-((1H-pyrazol-1-yl)methyl)-1H-1,2,3-triazol-1-yl)methyl)benzene, 1,3,5-C6H3(PyT)3) were conveniently synthesised in 'one pot' reactions using the Cu(i) catalysed 'click' reaction. Rh(i), Ir(i), Rh(iii) and Ir(iii) complexes with ligands of the general formulae C6H6-n[(PyT)M(CO)2]n[BAr]n (M = Rh, Ir; n = 2, 3; ; ) and C6H6-n[(PyT)MCp*Cl]n[BAr]n (M = Rh, Ir; n = 2, 3; ; ) were synthesised and fully characterised. In solution each of the bi- or tri-metallic complexes and exists as a mixture of two (, ) or three ( and ) diastereomers due to the presence of a chiral centre at each metal centre in these complexes. The solid state structures of complexes and were determined by single crystal X-ray crystallography and showed that each bidentate arm of these multitopic ligands coordinates to the Rh or Ir centre in a bidentate fashion via the pyrazolyl-N2 and 1,2,3-triazolyl N3' donors. The intermetallic distances in these solid state structures vary from 8.66 Å to 15.17 Å. These complexes were assessed as catalysts for the dihydroalkoxylation of alkynes using the cyclisation of 2-(5-hydroxypent-1-ynyl)benzyl alcohol, , to a mixture of two spiroketals, 2,3,4,5-tetrahydro-spirol[furan-2,3'-isochroman], , and 3',4',5',6'-tetrahydro-spiro[isobenzofuran-1(3H),2'(2H)pyran], , as the model reaction. The Rh(i) complexes (), with the highest TOF of 2052 h(-1) for complex , were the most active catalysts when compared with the other complexes under investigation here. The Ir(i) complexes () were moderately active as catalysts for the same transformation. No significant enhancement in catalytic reactivity was observed with the Rh(i) series bi- and trimetallic complexes () when compared with their monometallic analogues. The bi- and trimetallic Ir(i) complexes () were much more efficient as catalysts for this transformation than their monometallic analogues, suggesting some intermetallic cooperativity. Rh(iii), , and Ir(iii), , complexes were not active as catalysts for this transformation.
Collapse
Affiliation(s)
- Khuong Q Vuong
- School of Chemistry, The University of New South Wales, Kensington, NSW 2052, Australia
| | | | | | | |
Collapse
|