251
|
Cervantes‐Reyes A, Rominger F, Hashmi ASK. Sterically Demanding Ag I and Cu I N-Heterocyclic Carbene Complexes: Synthesis, Structures, Steric Parameters, and Catalytic Activity. Chemistry 2020; 26:5530-5540. [PMID: 32104933 PMCID: PMC7216994 DOI: 10.1002/chem.202000600] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2020] [Revised: 02/27/2020] [Indexed: 12/13/2022]
Abstract
The synthesis and full characterization of new air-stable AgI and CuI complexes bearing structurally bulky expanded-ring N-heterocyclic carbene (erNHC) ligands is presented. The condensation of protonated NHC salts with Ag2 O afforded a collection of AgI complexes, and their first use as ligand transfer reagents led to novel isostructural CuI or AuI complexes. In situ deprotonation of the NHC salts in the presence of a copper(I) source, provides a library of new CuI complexes. The solid-state structures feature large N-CNHC -N angles (118-128°) and almost identical angles between the aryl groups on the nitrogen atoms and the plane of the N-C-N unit of the carbene (i.e. torsion angles close to 0°). Among the steric parameters, the percent buried volume (%Vbur ) values span easily in the 50-57 % range, and that one of (9-Dipp)CuBr complex (%Vbur =57.5) overcomes to other known erNHC-metal complexes reported to date. Preliminary catalytic experiments in the copper-catalyzed coupling between N-tosylhydrazone and phenylacetylene, afforded 76-93 % product at the 0.5-2.5 mol % catalyst loading, proving the stability of CuI erNHC complexes at elevated temperatures (100 °C).
Collapse
Affiliation(s)
| | - Frank Rominger
- Organisch-Chemisches InstitutHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
| | - A. Stephen K. Hashmi
- Organisch-Chemisches InstitutHeidelberg UniversityIm Neuenheimer Feld 27069120HeidelbergGermany
- Chemistry DepartmentFaculty of ScienceKing Abdulaziz UniversityJeddah21589Saudi Arabia
| |
Collapse
|
252
|
Asada T, Hoshimoto Y, Ogoshi S. Rotation-Triggered Transmetalation on a Heterobimetallic Cu/Al N-Phosphine-Oxide-Substituted Imidazolylidene Complex. J Am Chem Soc 2020; 142:9772-9784. [DOI: 10.1021/jacs.0c03252] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Takahiro Asada
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Yoichi Hoshimoto
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Sensuke Ogoshi
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| |
Collapse
|
253
|
Dong Z, Pezzato C, Sienkiewicz A, Scopelliti R, Fadaei-Tirani F, Severin K. SET processes in Lewis acid-base reactions: the tritylation of N-heterocyclic carbenes. Chem Sci 2020; 11:7615-7618. [PMID: 34094138 PMCID: PMC8159480 DOI: 10.1039/d0sc01278e] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
Abstract
Reactions between N-heterocyclic carbenes (NHCs) and the trityl cation, [Ph3C]+, give covalent adducts of type [NHC-CPh3]+ and/or [NHC-C6H5-CPh2]+. EPR spectroscopy, UV-Vis analyses, and trapping experiments imply that adduct formation involves carbene radical cations and the trityl radical. The results demonstrate that single electron transfer (SET) processes should be considered for reaction of NHCs with oxidizing Lewis acids.
Collapse
Affiliation(s)
- Zhaowen Dong
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Cristian Pezzato
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | | | - Rosario Scopelliti
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Farzaneh Fadaei-Tirani
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| | - Kay Severin
- Institut des Sciences et Ingénierie Chimiques, École Polytechnique Fédérale de Lausanne (EPFL) 1015 Lausanne Switzerland
| |
Collapse
|
254
|
Bockfeld D, Tamm M. Isolation of N‐Heterocyclic Carbene‐Stabilized Phosphorus and Arsenic Mononitride. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000094] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Dirk Bockfeld
- Institut für Anorganische und Analytische Chemie Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie Technische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| |
Collapse
|
255
|
Wang Y, Tope CA, Xie Y, Wei P, Urbauer JL, Schaefer HF, Robinson GH. Carbene‐Stabilized Disilicon as a Silicon‐Transfer Agent: Synthesis of a Dianionic Silicon Tris(dithiolene) Complex. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201916395] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yuzhong Wang
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Cynthia A. Tope
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Yaoming Xie
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Pingrong Wei
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Jeffrey L. Urbauer
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Henry F. Schaefer
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| | - Gregory H. Robinson
- Department of Chemistry and the Center for Computational Chemistry The University of Georgia Athens GA 30602-2556 USA
| |
Collapse
|
256
|
Buzsáki D, Kelemen Z, Nyulászi L. Stretching the P-C Bond. Variations on Carbenes and Phosphanes. J Phys Chem A 2020; 124:2660-2671. [PMID: 32159965 PMCID: PMC7307921 DOI: 10.1021/acs.jpca.0c00641] [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: 01/23/2020] [Revised: 03/10/2020] [Indexed: 11/28/2022]
Abstract
The stability and the structure of adducts formed between four substituted phosphanes (PX3, X:H, F, Cl, and NMe2) and 11 different carbenes have been investigated by DFT calculations. In most cases, the structure of the adducts depends strongly on the stability of the carbene itself, exhibiting a linear correlation with the increasing dissociation energy of the adduct. Carbenes of low stability form phosphorus ylides (F), which can be described as phosphane → carbene adducts supported with some back-bonding. The most stable carbenes, which have high energy lone pair, do not form stable F-type structures but carbene → phosphane adducts (E-type structure), utilizing the low-lying lowest unoccupied molecular orbital (LUMO) of the phosphane (with electronegative substituents), benefiting also from the carbene-pnictogen interaction. Especially noteworthy is the case of PCl3, which has an extremely low energy LUMO in its T-shaped form. Although this PCl3 structure is a transition state of rather high energy, the large stabilization energy of the complex makes this carbene-phosphane adduct stable. Most interestingly, in case of carbenes with medium stability both F- and E-type structures could be optimized, giving rise to bond-stretch isomerism. Likewise, for phosphorus ylides (F), the stability of the adducts G formed from carbenes with hypovalent phosphorus (PX-phosphinidene) is in a linear relationship with the stabilization of the carbene. Adducts of carbenes with hypervalent phosphorus (PX5) are the most stable when X is electronegative, and the carbene is highly nucleophilic.
Collapse
Affiliation(s)
- Dániel Buzsáki
- Department
of Inorganic and Analytical Chemistry, Budapest
University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary
| | - Zsolt Kelemen
- Department
of Inorganic and Analytical Chemistry, Budapest
University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary
| | - László Nyulászi
- Department
of Inorganic and Analytical Chemistry, Budapest
University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary
- MTA-BME
Computation Driven Chemistry Research Group, Szent Gellért tér 4, H-1111 Budapest, Hungary
| |
Collapse
|
257
|
Hansmann MM, Antoni PW, Pesch H. Stable Mesoionic N-Heterocyclic Olefins (mNHOs). Angew Chem Int Ed Engl 2020; 59:5782-5787. [PMID: 31863704 PMCID: PMC7154647 DOI: 10.1002/anie.201914571] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Revised: 12/16/2019] [Indexed: 01/07/2023]
Abstract
We report a new class of stable mesoionic N-heterocyclic olefins, featuring a highly polarized (strongly ylidic) double bond. The ground-state structure cannot be described through an uncharged mesomeric Lewis-structure, thereby structurally distinguishing them from traditional N-heterocyclic olefins (NHOs). mNHOs can easily be obtained through deprotonation of the corresponding methylated N,N'-diaryl-1,2,3-triazolium and N,N'-diaryl-imidazolium salts, respectively. In their reactivity, they represent strong σ-donor ligands as shown by their coordination complexes of rhodium and boron. Their calculated proton affinities, their experimentally derived basicities (competition experiments), as well as donor abilities (Tolman electronic parameter; TEP) exceed the so far reported class of NHOs.
Collapse
Affiliation(s)
- Max M. Hansmann
- Fakultät für Chemie und Chemische BiologieTechnische Universität DortmundOtto-Hahn-Str. 644227DortmundGermany
- Georg-August Universität GöttingenInstitut für Organische und Biomolekulare ChemieTammannstr. 237077GöttingenGermany
| | - Patrick W. Antoni
- Georg-August Universität GöttingenInstitut für Organische und Biomolekulare ChemieTammannstr. 237077GöttingenGermany
| | - Henner Pesch
- Georg-August Universität GöttingenInstitut für Organische und Biomolekulare ChemieTammannstr. 237077GöttingenGermany
| |
Collapse
|
258
|
Plaza‐Lozano D, Morales‐Martínez D, González FJ, Olguín J. Homoleptic Mononuclear Tris‐Chelate Complexes of Fe
II
, Co
II
, Ni
II
, and Zn
II
Based on a Redox‐Active Imidazolyl‐2‐thione Ligand: Structural and Electrochemical Correlation. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000120] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Diego Plaza‐Lozano
- Departamento de Química Centro de Investigación y de Estudios Avanzados del IPN (Cinvestav) Avenida IPN 2508, Col. San Pedro Zacatenco 07360 Ciudad de México México
| | - Daniel Morales‐Martínez
- Departamento de Química Centro de Investigación y de Estudios Avanzados del IPN (Cinvestav) Avenida IPN 2508, Col. San Pedro Zacatenco 07360 Ciudad de México México
| | - Felipe J. González
- Departamento de Química Centro de Investigación y de Estudios Avanzados del IPN (Cinvestav) Avenida IPN 2508, Col. San Pedro Zacatenco 07360 Ciudad de México México
| | - Juan Olguín
- Departamento de Química Centro de Investigación y de Estudios Avanzados del IPN (Cinvestav) Avenida IPN 2508, Col. San Pedro Zacatenco 07360 Ciudad de México México
| |
Collapse
|
259
|
Recent Progress in N-Heterocyclic Carbene Gold-Catalyzed Reactions of Alkynes Involving Oxidation/Amination/Cycloaddition. Catalysts 2020. [DOI: 10.3390/catal10030350] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
Recent rapid development in homogeneous gold catalysis affords an alternative and particularly thriving strategy for the generation of gold carbenes through gold-catalyzed oxidation/amination/cycloaddition of alkynes, while it avoids the employment of hazardous and potentially explosive diazo compounds as starting materials for carbene generation. In addition to facile and secure operation, gold carbenes generated in this strategy display good chemoselectivity distinct from other metal carbenes produced from the related diazo approach. N-heterocyclic carbene (NHC) gold is a special metal complex that can be used as ancillary ligands, which provides enhanced stability and can also act as an efficient chiral directing group. In this review, we will present an overview of these recent advances in alkyne oxidation/amination/cycloaddition by highlighting their specificity and applicability, aiming to facilitate progress in this very exciting area of research.
Collapse
|
260
|
Barthes C, Duhayon C, Canac Y, César V. N-Cyclopropenio-imidazol-2-ylidene: An N-heterocyclic carbene bearing an N-cationic substituent. Chem Commun (Camb) 2020; 56:3305-3308. [PMID: 32073051 DOI: 10.1039/d0cc00477d] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A cationic NHC 1+ bearing an N-bound 2,3-bis(diisopropylamino)cyclopropenium group is reported. From an easily available dicationic imidazolium precursor, the coordination abilities and stereo-electronic properties of 1+ are evaluated by the formation of Pd(ii), Rh(i) and Au(i) complexes. The cationic gold(i) complex is implemented in representative intramolecular Au(i)-catalyzed cyclizations.
Collapse
Affiliation(s)
- Cécile Barthes
- LCC-CNRS, Université de Toulouse, CNRS, 31400 Toulouse, France.
| | - Carine Duhayon
- LCC-CNRS, Université de Toulouse, CNRS, 31400 Toulouse, France.
| | - Yves Canac
- LCC-CNRS, Université de Toulouse, CNRS, 31400 Toulouse, France.
| | - Vincent César
- LCC-CNRS, Université de Toulouse, CNRS, 31400 Toulouse, France.
| |
Collapse
|
261
|
Ho LP, Anders L, Tamm M. Group 13 Element Trihalide Complexes of Anionic N-Heterocyclic Carbenes. Chem Asian J 2020; 15:845-851. [PMID: 32011782 PMCID: PMC7154526 DOI: 10.1002/asia.201901774] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2019] [Indexed: 11/30/2022]
Abstract
A series of group 13 complexes of the general type [{(WCA-IDipp)EX3 }Li(solv)] (E=B, Al, Ga, In; X=Cl, Br) that bear an anionic N-heterocyclic carbene ligand with a weakly coordinating borate moiety (WCA-IDipp, WCA=B(C6 F5 )3 and IDipp=1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene) were prepared by the reaction of the respective group 13 trihalides (EX3 ) with the lithium salt [(WCA-IDipp)Li ⋅ toluene]. The molecular structures of the BBr3 , AlCl3 , AlBr3 , GaCl3 and InCl3 adducts were established by X-ray diffraction analyses, revealing the formation of coordination polymers linked by halide-lithium interactions, except for the indium derivative, which consists of isolated [Li(THF)4 ]+ and [(WCA-IDipp)InCl3 ]- ions in the solid state.
Collapse
Affiliation(s)
- Luong Phong Ho
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Lisa Anders
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Matthias Tamm
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| |
Collapse
|
262
|
Merschel A, Rottschäfer D, Neumann B, Stammler HG, Ghadwal RS. Quantifying the Electronic and Steric Properties of 1,3-Imidazole-Based Mesoionic Carbenes (iMICs). Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00045] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Arne Merschel
- Anorganische Molekülchemie und Katalyse, Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
| | - Dennis Rottschäfer
- Anorganische Molekülchemie und Katalyse, Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
| | - Beate Neumann
- Anorganische Molekülchemie und Katalyse, Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
| | - Hans-Georg Stammler
- Anorganische Molekülchemie und Katalyse, Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
| | - Rajendra S. Ghadwal
- Anorganische Molekülchemie und Katalyse, Lehrstuhl für Anorganische Chemie und Strukturchemie, Centrum für Molekulare Materialien, Fakultät für Chemie, Universität Bielefeld, Universitätsstraße 25, D-33615 Bielefeld, Germany
| |
Collapse
|
263
|
C S cross-coupling catalyzed by a series of easily accessible, well defined Ni(II) complexes of the type [(NHC)Ni(Cp)(Br)]. J Catal 2020. [DOI: 10.1016/j.jcat.2020.01.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
|
264
|
Naz NR, Schnakenburg G, Mikeházi A, Kelemen Z, Nyulászi L, Boeré RT, Streubel R. Janus bis(NHCs) tuned by heteroatom-bridge oxidation states. Chem Commun (Camb) 2020; 56:2646-2649. [PMID: 32022028 DOI: 10.1039/c9cc08468a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Synthesis of the first tricyclic bis(carbenes) with facially opposed imidazole-2-ylidenes and two linking phosphorus centres in different oxidation states is presented using a modular, high-yield synthetic route. The formation of homo bimetallic coinage metal complexes provides a glimpse on their potential use.
Collapse
Affiliation(s)
- Nabila Rauf Naz
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany.
| | - Gregor Schnakenburg
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany.
| | - Antal Mikeházi
- Department of Inorganic and Analytical Chemistry and MTA-BME Computation Driven Chemistry Research Group, Budapest University of Technology and Economics, Szt Gellert ter 4, 1111 Budapest, Hungary.
| | - Zsolt Kelemen
- Department of Inorganic and Analytical Chemistry and MTA-BME Computation Driven Chemistry Research Group, Budapest University of Technology and Economics, Szt Gellert ter 4, 1111 Budapest, Hungary.
| | - László Nyulászi
- Department of Inorganic and Analytical Chemistry and MTA-BME Computation Driven Chemistry Research Group, Budapest University of Technology and Economics, Szt Gellert ter 4, 1111 Budapest, Hungary.
| | - René T Boeré
- Department of Chemistry and Biochemistry, University of Lethbridge, 4401 University Drive West, Lethbridge, AB T1K3M4, Canada.
| | - Rainer Streubel
- Institut für Anorganische Chemie der Rheinischen Friedrich-Wilhelms-Universität Bonn, Gerhard-Domagk-Strasse 1, 53121 Bonn, Germany.
| |
Collapse
|
265
|
Chan SC, Ang ZZ, Gupta P, Ganguly R, Li Y, Ye S, England J. Carbodicarbene Ligand Redox Noninnocence in Highly Oxidized Chromium and Cobalt Complexes. Inorg Chem 2020; 59:4118-4128. [PMID: 32101411 DOI: 10.1021/acs.inorgchem.0c00153] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Carbodicarbenes (CDCs) possess two lone pairs of electrons on their central carbone C atom (Ccarbone). Coordination to a transition metal via a σ bond leaves one pair of electrons with appropriate symmetry for π donation to the metal. However, the high energy of the latter also renders the CDC ligand potentially redox-active. Herein, we explore these alternatives in the redox series [Cr(L)2]n+ and [Co(L)2]n+ (n = 2-5), where L is a tridentate ligand comprised of a central CDC and two flanking pyridine donors. To this end, all members of both redox series were synthesized and their electronic structures were investigated by using a combination of 1H NMR, Evans' NMR, IR, UV-vis, and EPR spectroscopies, SQUID magnetometry, X-ray crystallography, and density functional theory studies. Whereas [CoII(L)2]2+ is a straightforward low-spin (S = 1/2) cobalt(II) complex, the corresponding chromium complex was found to feature an electronic structure that is intermediate between the two limiting resonance forms [CrIII(L•-)(L)]2+ and [CrII(L)2]2+. In the case of the tri-, tetra-, and pentacationic complexes, the qualitatively identical electronic structures [MIII(L)2]3+, [MIII(L•+)(L)]4+, and [MIII(L•+)2]5+ were observed for both metals. Thus, the metal ions retain a 3+ oxidation state throughout, and the higher redox states contain oxidized ligands. The majority of the unpaired spin on the cation radical ligands was calculated to be localized in π-symmetry orbitals on the coordinated Ccarbone atoms. Analogous behavior was previously reported for the corresponding iron redox series and, as such, redox noninnocence in oxidized CDC and, more broadly, carbone complexes is likely widely accessible.
Collapse
Affiliation(s)
- Siu-Chung Chan
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University (NTU), 21 Nanyang Link, 637371, Singapore
| | - Zhi Zhong Ang
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University (NTU), 21 Nanyang Link, 637371, Singapore
| | - Puneet Gupta
- Max-Plank-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr D-45470, Germany
| | - Rakesh Ganguly
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University (NTU), 21 Nanyang Link, 637371, Singapore
| | - Yongxin Li
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University (NTU), 21 Nanyang Link, 637371, Singapore
| | - Shengfa Ye
- Max-Plank-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, Mülheim an der Ruhr D-45470, Germany.,State Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Jason England
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University (NTU), 21 Nanyang Link, 637371, Singapore
| |
Collapse
|
266
|
Danés S, Müller C, Wirtz L, Huch V, Block T, Pöttgen R, Schäfer A, Andrada DM. Bonding Situation in Stannocene and Plumbocene N-Heterocyclic Carbene Complexes. Organometallics 2020. [DOI: 10.1021/acs.organomet.9b00667] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Sergi Danés
- Saarland University, Faculty of Natural Sciences and Technology, Department of Chemistry, Campus Saarbrücken, 66123 Saarbrücken, Federal Republic of Germany
| | - Carsten Müller
- Saarland University, Faculty of Natural Sciences and Technology, Department of Chemistry, Campus Saarbrücken, 66123 Saarbrücken, Federal Republic of Germany
| | - Lisa Wirtz
- Saarland University, Faculty of Natural Sciences and Technology, Department of Chemistry, Campus Saarbrücken, 66123 Saarbrücken, Federal Republic of Germany
| | - Volker Huch
- Saarland University, Faculty of Natural Sciences and Technology, Department of Chemistry, Campus Saarbrücken, 66123 Saarbrücken, Federal Republic of Germany
| | - Theresa Block
- University of Münster, Faculty of Chemistry and Pharmacy, Institute of Inorganic and Analytical Chemistry, Corrensstrasse 30, 48149 Münster, Federal Republic of Germany
| | - Rainer Pöttgen
- University of Münster, Faculty of Chemistry and Pharmacy, Institute of Inorganic and Analytical Chemistry, Corrensstrasse 30, 48149 Münster, Federal Republic of Germany
| | - André Schäfer
- Saarland University, Faculty of Natural Sciences and Technology, Department of Chemistry, Campus Saarbrücken, 66123 Saarbrücken, Federal Republic of Germany
| | - Diego M. Andrada
- Saarland University, Faculty of Natural Sciences and Technology, Department of Chemistry, Campus Saarbrücken, 66123 Saarbrücken, Federal Republic of Germany
| |
Collapse
|
267
|
Shen Y, Zheng Q, Zhu H, Tu T. Hierarchical Porous Organometallic Polymers Fabricated by Direct Knitting: Recyclable Single-Site Catalysts with Enhanced Activity. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e1905950. [PMID: 31808591 DOI: 10.1002/adma.201905950] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2019] [Revised: 11/13/2019] [Indexed: 06/10/2023]
Abstract
Porous organometallic polymers (POMPs) with hierarchical pore structures, high specific surface areas, and atomically dispersed metal (Ir, Pd, Ru) centers are successfully fabricated by a facile one-pot method through direct knitting of diverse N-heterocyclic carbene metal (NHC-M) complexes. These polymers can function as recyclable solid single-site catalysts and exhibit excellent catalytic activity and selectivity in both dehydrogenation and hydrogenation reactions even at ppm-level catalyst loadings. Remarkably, a record turnover number (TON) of 1.01 × 106 is achieved in the hydrogenation of levulinic acid to γ-valerolactone, which is 750 times higher than that attained with corresponding bis-NHC-Ir complex.
Collapse
Affiliation(s)
- Yajing Shen
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai, 200438, China
| | - Qingshu Zheng
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai, 200438, China
| | - Haibo Zhu
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai, 200438, China
| | - Tao Tu
- Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Department of Chemistry, Fudan University, 2005 Songhu Road, Shanghai, 200438, China
- State Key Laboratory of Organometallic Chemistry, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences, Shanghai, 200032, China
- College of Chemistry and Molecular Engineering, Zhengzhou University, 100 Kexue Avenue, Zhengzhou, 450001, China
| |
Collapse
|
268
|
Luo K, Li J, Cao Y, Liu C, Ge J, Chen H, Zare RN. Reaction of chloroauric acid with histidine in microdroplets yields a catalytic Au-(His) 2 complex. Chem Sci 2020; 11:2558-2565. [PMID: 34084419 PMCID: PMC8157187 DOI: 10.1039/c9sc06221a] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 01/29/2020] [Indexed: 01/17/2023] Open
Abstract
An aqueous solution containing histidine (His, 100 μM) and chloroauric acid (HAuCl4, 10 μM) is electrosprayed (-4.5 kV) from a capillary (50 μm in diameter) with N2 nebulizing gas (120 psi). The resulting microdroplets entered a mass spectrometer with a 2 cm flight path. The mass spectrum recorded in negative ion mode showed several peaks including the Au5 nanocluster with the major one being [Au + 2His-2H]-, which is a catalytically active species. The reaction time was less 1 ms, and the yield of [Au + 2His-2H]- was 76%. In contrast, the bulk reaction for the same concentration run at room temperature for 2 h did not produce this species but instead formed Au10 nanocluster. When a solution of water and acetonitrile (1 : 1) containing indoline (100 mM) and the phenylacetylene (200 mM) as well as histidine and chloroauric acid at the same concentrations as above was electrosprayed, the mass spectrum showed the formation of the intermediate [Au + 2His + phenylacetylene + H]+. Upon collecting the microdroplets, the 4-methyl-4,6-diphenyl-1,2-dihydro-4H-pyrrolo[3,2,1-ij] quinolone product was observed by 1H nuclear magnetic resonance and liquid chromatography with a yield of 44%. The microdroplet synthesis using the Au-(His)2 complex as a catalyst was scaled up using room-temperature ultrasonic nebulization to produce the product at the rate of 35 mg min-1, which is semi-preparative and demonstrates the promise of using microdroplet reactions for chemical synthesis.
Collapse
Affiliation(s)
- Kai Luo
- Department of Chemistry, Fudan University Shanghai 200438 China
| | - Jia Li
- Department of Chemistry, Fudan University Shanghai 200438 China
| | - Yufei Cao
- Department of Chemical Engineering, Key Lab for Industrial Biocatalysis, Ministry of Education, Tsinghua University Beijing 100084 China
| | - Chengyuan Liu
- Department of Chemistry, Fudan University Shanghai 200438 China
| | - Jun Ge
- Department of Chemical Engineering, Key Lab for Industrial Biocatalysis, Ministry of Education, Tsinghua University Beijing 100084 China
| | - Hao Chen
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology Newark NJ 07102 USA
| | - Richard N Zare
- Department of Chemistry, Fudan University Shanghai 200438 China
| |
Collapse
|
269
|
Affiliation(s)
- Harrison J. Barnett
- Research School of Chemistry The Australian National University Canberra ACT 2601 Australia
| | - Anthony F. Hill
- Research School of Chemistry The Australian National University Canberra ACT 2601 Australia
| |
Collapse
|
270
|
Barnett HJ, Hill AF. A Dirhoda‐Heterocyclic Carbene. Angew Chem Int Ed Engl 2020; 59:4274-4277. [DOI: 10.1002/anie.201912650] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/22/2019] [Indexed: 12/25/2022]
Affiliation(s)
- Harrison J. Barnett
- Research School of Chemistry The Australian National University Canberra ACT 2601 Australia
| | - Anthony F. Hill
- Research School of Chemistry The Australian National University Canberra ACT 2601 Australia
| |
Collapse
|
271
|
Dhara D, Das S, Kalita P, Maiti A, Pati SK, Scheschkewitz D, Chandrasekhar V, Jana A. Influence of N-heterocyclic carbenes (NHCs) on the hydrolysis of a diphosphene. Dalton Trans 2020; 49:993-997. [PMID: 31913377 DOI: 10.1039/c9dt04690a] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
We report the influence of N-heterocyclic carbenes (NHCs) on the hydrolysis of a diphosphene TerP[double bond, length as m-dash]PTer (1; Ter = 2,6-Mes2C6H3; Mes = 2,4,6-Me3C6H2), a phosphorus-analogue of an alkene. The diphosphene 1 itself is completely inert towards water. However, NHCs have been found to activate 1 towards ready hydrolysis. While sterically less-encumbered NHCs react with 1 affording NHC-adducts which are in equilibrium with 1 in solution, sterically encumbered NHCs do not bind to 1 at all. Interestingly, in both of these situations hydrolysis of the P[double bond, length as m-dash]P motif proceeds efficiently. At low temperatures, sterically less-encumbered NHCs are catalytic while the sterically encumbered NHCs play a catalytic role at room temperature. To gain insight on this striking influence of NHCs on the hydrolysis of diphosphene detailed low-temperature 31P-NMR studies along with theoretical calculations have been carried out. In addition, systematic hydrolysis studies of all the NHCs used in this study have also been performed.
Collapse
Affiliation(s)
- Debabrata Dhara
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500107, India.
| | - Shubhajit Das
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore-560064, India.
| | - Pankaj Kalita
- National Institute of Science Education and Research, Bhimpur-Padanpur, Jatni, Khurda, Bhubaneswar-752050, Odisha, India
| | - Avijit Maiti
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500107, India.
| | - Swapan K Pati
- New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research, Bangalore-560064, India.
| | - David Scheschkewitz
- Krupp-Chair of General and Inorganic Chemistry, Saarland University, 66123, Saarbrücken, Germany.
| | - Vadapalli Chandrasekhar
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500107, India. and Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India.
| | - Anukul Jana
- Tata Institute of Fundamental Research Hyderabad, Gopanpally, Hyderabad-500107, India.
| |
Collapse
|
272
|
Hansmann MM, Antoni PW, Pesch H. Stable Mesoionic N‐Heterocyclic Olefins (mNHOs). Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.201914571] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Max M. Hansmann
- Fakultät für Chemie und Chemische Biologie Technische Universität Dortmund Otto-Hahn-Str. 6 44227 Dortmund Germany
- Georg-August Universität Göttingen Institut für Organische und Biomolekulare Chemie Tammannstr. 2 37077 Göttingen Germany
| | - Patrick W. Antoni
- Georg-August Universität Göttingen Institut für Organische und Biomolekulare Chemie Tammannstr. 2 37077 Göttingen Germany
| | - Henner Pesch
- Georg-August Universität Göttingen Institut für Organische und Biomolekulare Chemie Tammannstr. 2 37077 Göttingen Germany
| |
Collapse
|
273
|
Goettel JT, Gao H, Dotzauer S, Braunschweig H. Me CAAC=N - : A Cyclic (Alkyl)(Amino)Carbene Imino Ligand. Chemistry 2020; 26:1136-1143. [PMID: 31777982 PMCID: PMC7027825 DOI: 10.1002/chem.201904715] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Indexed: 12/27/2022]
Abstract
A cyclic (alkyl)(amino)carbene (CAAC) has been shown to react with a covalent azide similar to the Staudinger reaction. The reaction of Me CAAC with trimethylsilyl azide afforded the N-silylated 2-iminopyrrolidine (Me CAAC=NSiMe3 ), which was fully characterized. This compound undergoes hydrolysis to afford the 2-iminopyrrolidine and trimethylsiloxane which co-crystallize as a hydrogen-bonded adduct. The N-silylated 2-iminopyrrolidine was used to transfer the novel pyrrolidine-2-iminato ligand onto both main-group and transition-metal centers. The reaction of the tetrabromodiborane bis(dimethyl sulfide) adduct with two equivalents of Me CAAC=NSiMe3 afforded the disubstituted diborane. The reaction of Me CAAC=NSiMe3 with TiCl4 and CpTiCl3 afforded Me CAAC=NTiCl3 and Me CAAC=NTiCl2 Cp, respectively.
Collapse
Affiliation(s)
- James T. Goettel
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Haopeng Gao
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Simon Dotzauer
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Holger Braunschweig
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| |
Collapse
|
274
|
Deev S, Batsyts S, Sheina E, Shestakova TS, Khalimbadzha I, Kiskin MA, Charushin V, Chupakhin O, Paramonov AS, Shenkarev ZO, Namyslo JC, Schmidt A. Betaine–N‐Heterocyclic Carbene Interconversions of Quinazolin‐4‐One Imidazolium Mesomeric Betaines. Sulfur, Selenium, and Borane Adduct Formation. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901622] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Sergey Deev
- Ural Federal University 19 Mira Street 620002 Yekaterinburg Russia
| | - Sviatoslav Batsyts
- Institute of Organic Chemistry Clausthal University of Technology Leibnizstrasse 6 38678 Clausthal‐Zellerfeld Germany
| | - Ekaterina Sheina
- Ural Federal University 19 Mira Street 620002 Yekaterinburg Russia
| | | | | | - Mikhail A. Kiskin
- N. S. Kurnakov Institute of General and Inorganic Chemistry, RAS 31 Leninsky Av. 119991 Moscow Russia
| | - Valery Charushin
- Ural Federal University 19 Mira Street 620002 Yekaterinburg Russia
- E I. Ya. Postovsky Institute of Organic Synthesis Ural Branch of the Russian Academy of Sciences 22 S. Kovalevskoy Street 620219 Yekaterinburg Russia
| | - Oleg Chupakhin
- Ural Federal University 19 Mira Street 620002 Yekaterinburg Russia
- E I. Ya. Postovsky Institute of Organic Synthesis Ural Branch of the Russian Academy of Sciences 22 S. Kovalevskoy Street 620219 Yekaterinburg Russia
| | - Alexander S. Paramonov
- Shemyakin‐Ovchinnikov Institute of Bioorganic Chemistry Russian Academy of Sciences 16/10 Miklukho‐Maklaya Street 117997 Moscow Russia
| | - Zakhar O. Shenkarev
- Shemyakin‐Ovchinnikov Institute of Bioorganic Chemistry Russian Academy of Sciences 16/10 Miklukho‐Maklaya Street 117997 Moscow Russia
| | - Jan C. Namyslo
- Institute of Organic Chemistry Clausthal University of Technology Leibnizstrasse 6 38678 Clausthal‐Zellerfeld Germany
| | - Andreas Schmidt
- Institute of Organic Chemistry Clausthal University of Technology Leibnizstrasse 6 38678 Clausthal‐Zellerfeld Germany
| |
Collapse
|
275
|
Rouf AM, Dai C, Xu F, Zhu J. Dinitrogen Activation by Tricoordinated Boron Species: A Systematic Design. ADVANCED THEORY AND SIMULATIONS 2020. [DOI: 10.1002/adts.201900205] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Alvi Muhammad Rouf
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen University Xiamen 361005 P. R. China
| | - Chenshu Dai
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen University Xiamen 361005 P. R. China
| | - Fangzhou Xu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen University Xiamen 361005 P. R. China
| | - Jun Zhu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry Department of ChemistryCollege of Chemistry and Chemical EngineeringXiamen University Xiamen 361005 P. R. China
| |
Collapse
|
276
|
Asada T, Hoshimoto Y, Kawakita T, Kinoshita T, Ogoshi S. Axial Chirality around N–P Bonds Induced by Complexation between E(C6F5)3 (E = B, Al) and an N-Phosphine Oxide-Substituted Imidazolinylidene: A Key Intermediate in the Catalytic Phosphinoylation of CO2. J Org Chem 2020; 85:14333-14341. [DOI: 10.1021/acs.joc.9b03210] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Takahiro Asada
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Yoichi Hoshimoto
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Takahiro Kawakita
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Takuya Kinoshita
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Sensuke Ogoshi
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| |
Collapse
|
277
|
Recent Advances in Rare Earth Complexes Containing N-Heterocyclic Carbenes: Synthesis, Reactivity, and Applications in Polymerization. Catalysts 2020. [DOI: 10.3390/catal10010071] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
N-heterocyclic carbenes (NHCs) are ubiquitous ancillary ligands employed in metal-catalyzed homogeneous reactions and polymerization reactions. Of significance is the use of NHCs as the supporting ligand in second- and third-generation Grubbs catalysts for their application in olefin metathesis and ring-opening metathesis polymerization. While the applications of transition metal catalysts ligated with NHCs in polymerization chemistry are well-documented, the use of analogous rare earth (Ln = Sc, Y, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, and Lu) catalysts in this area remains under-developed, despite the unique role of rare earth elements in regio- and stereo-specific (co)polymerization reactions. By using hetero-atom-tethered chelating NHCs and, more recently, the employment of other structurally related NHCs, NHC-ligated Ln complexes have proven to be promising and fruitful catalysts for selective polymerization reactions. This review summarizes the recent developments in the coordination chemistry of Ln complexes containing NHCs and their catalytic performance in polymerization.
Collapse
|
278
|
Balmer M, Franzke YJ, Weigend F, von Hänisch C. Low-Valent Group 14 Phosphinidenide Complexes [({SIDipp}P) 2 M] Exhibit P-M pπ-pπ Interaction (M=Ge, Sn, Pb). Chemistry 2020; 26:192-197. [PMID: 31702848 PMCID: PMC6972534 DOI: 10.1002/chem.201905061] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/06/2019] [Indexed: 11/10/2022]
Abstract
Herein, the synthesis of new low-valent Group 14 phosphinidenide complexes [({SIDipp}P)2 M] exhibiting P-M pπ-pπ interactions (SIDipp=1,3-bis(2,6-diisopropylphenyl)-imidazolidin-2-ylidene, M=Ge, Sn, Pb), is presented. These compounds were investigated by means of structural, spectroscopic, and quantum-chemical methods. Furthermore, the monosubstituted compounds [(SIDippP)MX]2 (M=Sn, X=Cl; M=Pb, X=Br) are presented, which show dimeric structures instead of multiple bonding interaction.
Collapse
Affiliation(s)
- Markus Balmer
- Fachbereich Chemie and Wissenschaftliches Zentrum für, Materialwissenschaften (WZMW)Philipps-Universität MarburgHans-Meerwein-Strasse 435032MarburgGermany
| | - Yannick J. Franzke
- Institute of Physical ChemistryKarlsruhe Institute of Technology (KIT)Kaiserstrasse 1276131KarlsruheGermany
| | - Florian Weigend
- Institute of NanotechnologyKarlsruhe Institute of Technology (KIT)Hermann-von-Helmholtz-Platz 176344Eggenstein-LeopoldshafenGermany
| | - Carsten von Hänisch
- Fachbereich Chemie and Wissenschaftliches Zentrum für, Materialwissenschaften (WZMW)Philipps-Universität MarburgHans-Meerwein-Strasse 435032MarburgGermany
| |
Collapse
|
279
|
Zhang ZF, Li TL, Su MD. Understanding the reactivity of carbene-analogous phosphane complexes with group 13 elements as a central atom: a theoretical investigation. NEW J CHEM 2020. [DOI: 10.1039/d0nj01708f] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The reactions of carbenic cations (PtBu3)2M+ (M = B, Al, Ga, In, and Tl) with methane and ethene are studied using density functional theory.
Collapse
Affiliation(s)
- Zheng-Feng Zhang
- Department of Applied Chemistry
- National Chiayi University
- Chiayi 60004
- Taiwan
| | - Tsung-Lung Li
- Department of Electrophysics
- National Chia-Yi University
- Chiayi 60004
- Taiwan
| | - Ming-Der Su
- Department of Applied Chemistry
- National Chiayi University
- Chiayi 60004
- Taiwan
- Department of Medicinal and Applied Chemistry
| |
Collapse
|
280
|
Adachi Y, Arai F, Jäkle F. Extended conjugated borenium dimers via late stage functionalization of air-stable borepinium ions. Chem Commun (Camb) 2020; 56:5119-5122. [DOI: 10.1039/d0cc02514c] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Conjugated dimeric borenium ions exhibit red-shifted absorptions, enhanced emission, and dramatically lower LUMO energies.
Collapse
Affiliation(s)
- Yohei Adachi
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - Fuka Arai
- Department of Applied Chemistry
- Graduate School of Engineering
- Hiroshima University
- Higashi-Hiroshima 739-8527
- Japan
| | - Frieder Jäkle
- Department of Chemistry
- Rutgers University Newark
- Newark
- USA
| |
Collapse
|
281
|
Frisch P, Inoue S. Lewis base-stabilized silyliumylidene ions in transition metal coordination chemistry. Dalton Trans 2020; 49:6176-6182. [DOI: 10.1039/d0dt00659a] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An overview of the progress made in the transition metal chemistry of isolable base-stabilized silyliumylidene ions.
Collapse
Affiliation(s)
- Philipp Frisch
- Department of Chemistry
- WACKER-Institute of Silicon Chemistry and Catalysis Research Center
- Technische Universität München
- 85748 Garching bei München
- Germany
| | - Shigeyoshi Inoue
- Department of Chemistry
- WACKER-Institute of Silicon Chemistry and Catalysis Research Center
- Technische Universität München
- 85748 Garching bei München
- Germany
| |
Collapse
|
282
|
Saab M, Nelson DJ, Tzouras NV, A. C. A. Bayrakdar T, Nolan SP, Nahra F, Van Hecke K. Straightforward access to chalcogenoureas derived from N-heterocyclic carbenes and their coordination chemistry. Dalton Trans 2020; 49:12068-12081. [PMID: 32820302 DOI: 10.1039/d0dt02558e] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we describe a straightforward access to chalcogenoureas derived from N-heterocyclic carbenes, and we investigate the coordination chemistry of selenoureas with coinage metals.
Collapse
Affiliation(s)
- Marina Saab
- Department of Chemistry
- Ghent University
- 9000 Ghent
- Belgium
| | - David J. Nelson
- WestCHEM Department of Pure & Applied Chemistry
- University of Strathclyde
- Glasgow
- UK
| | | | | | | | - Fady Nahra
- Department of Chemistry
- Ghent University
- 9000 Ghent
- Belgium
- VITO (Flemish Institute for Technological Research)
| | | |
Collapse
|
283
|
Rottschäfer D, Glodde T, Neumann B, Stammler HG, Ghadwal RS. A crystalline C5-protonated 1,3-imidazol-4-ylidene. Chem Commun (Camb) 2020; 56:2027-2030. [DOI: 10.1039/c9cc09428h] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
The first C5-protonated 1,3-imidazole-based mesoionic carbene (iMICBp) has been isolated and characterized by single-crystal X-ray diffraction.
Collapse
Affiliation(s)
- Dennis Rottschäfer
- Molecular Inorganic Chemistry and Catalysis
- Inorganic and Structural Chemistry
- Center for Molecular Materials
- Faculty of Chemistry
- Universität Bielefeld
| | - Timo Glodde
- Molecular Inorganic Chemistry and Catalysis
- Inorganic and Structural Chemistry
- Center for Molecular Materials
- Faculty of Chemistry
- Universität Bielefeld
| | - Beate Neumann
- Molecular Inorganic Chemistry and Catalysis
- Inorganic and Structural Chemistry
- Center for Molecular Materials
- Faculty of Chemistry
- Universität Bielefeld
| | - Hans-Georg Stammler
- Molecular Inorganic Chemistry and Catalysis
- Inorganic and Structural Chemistry
- Center for Molecular Materials
- Faculty of Chemistry
- Universität Bielefeld
| | - Rajendra S. Ghadwal
- Molecular Inorganic Chemistry and Catalysis
- Inorganic and Structural Chemistry
- Center for Molecular Materials
- Faculty of Chemistry
- Universität Bielefeld
| |
Collapse
|
284
|
Scattolin T, Tzouras NV, Falivene L, Cavallo L, Nolan SP. Using sodium acetate for the synthesis of [Au(NHC)X] complexes. Dalton Trans 2020; 49:9694-9700. [DOI: 10.1039/d0dt02240c] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Abstract
Sodium acetate enables the synthesis of [Au(NHC)Cl] complexes, as well as their Au-alkynyl and -thiolato derivatives in high yields, under air and in technical grade, green solvents. The mild synthetic methods are also investigated computationally.
Collapse
Affiliation(s)
- Thomas Scattolin
- Department of Chemistry and Center for Sustainable Chemistry
- Ghent University
- Ghent
- Belgium
| | - Nikolaos V. Tzouras
- Department of Chemistry and Center for Sustainable Chemistry
- Ghent University
- Ghent
- Belgium
| | - Laura Falivene
- Department KAUST Catalysis Centre
- KCC
- King Abdullah University of Science and Technology
- Thuwal-23955-6900
- Saudi Arabia
| | - Luigi Cavallo
- Department KAUST Catalysis Centre
- KCC
- King Abdullah University of Science and Technology
- Thuwal-23955-6900
- Saudi Arabia
| | - Steven P. Nolan
- Department of Chemistry and Center for Sustainable Chemistry
- Ghent University
- Ghent
- Belgium
| |
Collapse
|
285
|
Ho LP, Körner L, Bannenberg T, Tamm M. Chalcogen complexes of anionic N-heterocyclic carbenes. Dalton Trans 2020; 49:13207-13217. [DOI: 10.1039/d0dt02392b] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Chalcogen complexes of anionic N-heterocyclic carbenes were isolated as lithium salts and their protonation and oxidation were studied.
Collapse
Affiliation(s)
- Luong Phong Ho
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Brauschweig
- Germany
| | - Lukas Körner
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Brauschweig
- Germany
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Brauschweig
- Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie
- Technische Universität Braunschweig
- 38106 Brauschweig
- Germany
| |
Collapse
|
286
|
Cicač-Hudi M, Feil CM, Birchall N, Nieger M, Gudat D. Proton transfer vs. oligophosphine formation by P–C/P–H σ-bond metathesis: decoding the competing Brønsted and Lewis type reactivities of imidazolio-phosphines. Dalton Trans 2020; 49:17401-17413. [DOI: 10.1039/d0dt03633a] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Cationic imidazolio-phosphines show two-sided reactivity towards bases, undergoing either Brønsted-type proton transfer to imidazolio-phosphides or autocatalytic Lewis acid/base reaction cascades to yield P-free imidazolium ions and oligophosphines.
Collapse
Affiliation(s)
- Mario Cicač-Hudi
- Institute of Inorganic Chemistry
- University of Stuttgart
- 70550 Stuttgart
- Germany
| | - Christoph M. Feil
- Institute of Inorganic Chemistry
- University of Stuttgart
- 70550 Stuttgart
- Germany
| | - Nicholas Birchall
- Institute of Inorganic Chemistry
- University of Stuttgart
- 70550 Stuttgart
- Germany
| | - Martin Nieger
- Department of Chemistry
- University of Helsinki
- 00014 Helsinki
- Finland
| | - Dietrich Gudat
- Institute of Inorganic Chemistry
- University of Stuttgart
- 70550 Stuttgart
- Germany
| |
Collapse
|
287
|
Sun Z, Cundari TR. Cyclic (alkyl)(amino)carbenes in organic and organometallic methane C–H activation: a DFT and MCSCF study. Phys Chem Chem Phys 2020; 22:24320-24329. [DOI: 10.1039/d0cp04080k] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Density functional theory (DFT) and multi-configurational self-consistent field (MCSCF) calculations are used to investigate the electronic and steric properties of cyclic (alkyl)(amino)carbenes (CAACs).
Collapse
Affiliation(s)
- Zhicheng Sun
- Univ. of North Texas
- Dept. of Chemistry
- Center for Advanced Computing and Modeling (CASCaM)
- Denton
- USA
| | - Thomas R. Cundari
- Univ. of North Texas
- Dept. of Chemistry
- Center for Advanced Computing and Modeling (CASCaM)
- Denton
- USA
| |
Collapse
|
288
|
Ren X, Wesolek M, Bailly C, Karmazin L, Braunstein P. Silver(I) and Nickel(II) Complexes with Oxygen‐ or Nitrogen‐Functionalized NHC Ditopic Ligands and Catalytic Ethylene Oligomerization. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201901064] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Xiaoyu Ren
- Université de Strasbourg CNRS CHIMIE UMR 7177, Laboratoire de Chimie de Coordination 4 rue Blaise Pascal 67081 Strasbourg Cedex France
| | - Marcel Wesolek
- Université de Strasbourg CNRS CHIMIE UMR 7177, Laboratoire de Chimie de Coordination 4 rue Blaise Pascal 67081 Strasbourg Cedex France
| | - Corinne Bailly
- Université de Strasbourg Service de Radiocristallographie, Fédération de Chimie «Le Belû FR2010 1 rue Blaise Pascal 67008 Strasbourg Cedex France
| | - Lydia Karmazin
- Université de Strasbourg Service de Radiocristallographie, Fédération de Chimie «Le Belû FR2010 1 rue Blaise Pascal 67008 Strasbourg Cedex France
| | - Pierre Braunstein
- Université de Strasbourg CNRS CHIMIE UMR 7177, Laboratoire de Chimie de Coordination 4 rue Blaise Pascal 67081 Strasbourg Cedex France
| |
Collapse
|
289
|
Peters M, Baabe D, Maekawa M, Bockfeld D, Zaretzke MK, Tamm M, Walter MD. Pogo-Stick Iron and Cobalt Complexes: Synthesis, Structures, and Magnetic Properties. Inorg Chem 2019; 58:16475-16486. [PMID: 31769666 DOI: 10.1021/acs.inorgchem.9b02411] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The synthesis, structures, and magnetic properties of monomeric half-sandwich iron and cobalt imidazolin-2-iminato complexes have been comprehensively investigated. Salt metathesis reactions of [Cp'M(μ-I)]2 (1-M, M = Fe, Co; Cp' = η5-1,2,4-tri-tert-butylcyclopentadienyl) with [ImDippNLi]2 (ImDippN = 1,3-bis(2,6-diisopropylphenyl)imidazolin-2-iminato) furnishes the terminal half-sandwich compounds [Cp'M(NImDipp)] (2-M, M = Fe, Co), which can be regarded as models for elusive half-sandwich iron and cobalt imido complexes. X-ray diffraction analysis confirmed the structure motif of a one-legged piano stool. Complex 2-Co can also be prepared by an acid-base reaction between [Cp'Co{N(SiMe3)2}] (3-Co) and ImDippNH. The electronic and magnetic properties of 2-M and 3-Co were probed by 57Fe Mössbauer spectroscopy (M = Fe), X-band EPR spectroscopy (M = Co), and solid-state magnetic susceptibility measurements. In particular, the central metal atom adopts a high-spin (S = 2) state in 2-Fe, while the cobalt complex 2-Co represents a rare example of a Co(II) species with a coordination number different from six displaying a low-spin to high-spin spin-crossover (SCO) behavior. The experimental observations are complemented by DFT calculations.
Collapse
Affiliation(s)
- Marius Peters
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Dirk Baabe
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Miyuki Maekawa
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Dirk Bockfeld
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Marc-Kevin Zaretzke
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| | - Marc D Walter
- Institut für Anorganische und Analytische Chemie , Technische Universität Braunschweig , Hagenring 30 , 38106 Braunschweig , Germany
| |
Collapse
|
290
|
Romeo LJ, Kaur A, Wilson DJD, Martin CD, Dutton JL. Evaluation of the σ-Donating and π-Accepting Properties of N-Heterocyclic Boryl Anions. Inorg Chem 2019; 58:16500-16509. [DOI: 10.1021/acs.inorgchem.9b02433] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Lorenzo J. Romeo
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Aishvaryadeep Kaur
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - David J. D. Wilson
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| | - Caleb D. Martin
- Department of Chemistry and Biochemistry, Baylor University, One Bear Place #97348, Waco, Texas 76798, United States
| | - Jason L. Dutton
- Department of Chemistry and Physics, La Trobe Institute for Molecular Science, La Trobe University, Melbourne, Victoria 3086, Australia
| |
Collapse
|
291
|
Synthesis of the Cyclic Group 13 Phosphinidenides [(NHC)PMCl
2
]
2
(NHC = SIMes, SIDipp; M = Al, Ga). Z Anorg Allg Chem 2019. [DOI: 10.1002/zaac.201900248] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
|
292
|
Ashraf MA, Liu Z, Peng W. Trisaminomethane–cobalt complex supported on Fe
3
O
4
magnetic nanoparticles as an efficient recoverable nanocatalyst for oxidation of sulfides and C–S coupling reactions. Appl Organomet Chem 2019. [DOI: 10.1002/aoc.5260] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Muhammad Aqeel Ashraf
- School of ForestryHenan Agricultural University Zhengzhou 450002 China
- Department of Geology Faculty of ScienceUniversity of Malaya 50603 Kuala Lumpur Malaysia
| | - Zhenling Liu
- School of ManagementHenan University of Technology Zhengzhou 450001 China
| | - Wan‐Xi Peng
- School of ForestryHenan Agricultural University Zhengzhou 450002 China
| |
Collapse
|
293
|
Affiliation(s)
- Ashim Nandi
- Department of Chemistry Ben-Gurion University of the Negev Beer-Sheva 841051 Israel
| | - Sebastian Kozuch
- Department of Chemistry Ben-Gurion University of the Negev Beer-Sheva 841051 Israel
| |
Collapse
|
294
|
Ullrich S, Kovačević B, Koch B, Harms K, Sundermeyer J. Design of non-ionic carbon superbases: second generation carbodiphosphoranes. Chem Sci 2019; 10:9483-9492. [PMID: 32055322 PMCID: PMC6993619 DOI: 10.1039/c9sc03565f] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2019] [Accepted: 08/15/2019] [Indexed: 12/31/2022] Open
Abstract
A new generation of carbodiphosphoranes (CDPs), incorporating pyrrolidine, tetramethylguanidine, or tris(dimethylamino)phosphazene as substituents is introduced as the most powerful class of non-ionic carbon superbases on the basicity scale to date. The synthetic approach as well as NMR spectroscopic and structural characteristics in the free and protonated form are described. Investigation of basicity in solution and in the gas phase by experimental and theoretical means provides the to our knowledge first reported pK BH + values for CDPs in the literature and suggest them as upper tier superbases.
Collapse
Affiliation(s)
- Sebastian Ullrich
- Fachbereich Chemie , Philipps-University Marburg , Hans-Meerwein-Straße , 35032 Marburg , Germany .
| | - Borislav Kovačević
- The Group for Computational Life Sciences , Rudjer Bošković Institute , Bijenička c. 54 , HR-10000 Zagreb , Croatia
| | - Björn Koch
- Fachbereich Chemie , Philipps-University Marburg , Hans-Meerwein-Straße , 35032 Marburg , Germany .
| | - Klaus Harms
- Fachbereich Chemie , Philipps-University Marburg , Hans-Meerwein-Straße , 35032 Marburg , Germany .
| | - Jörg Sundermeyer
- Fachbereich Chemie , Philipps-University Marburg , Hans-Meerwein-Straße , 35032 Marburg , Germany .
| |
Collapse
|
295
|
Thiess T, Mellerup SK, Braunschweig H. B-B Cleavage and Ring-Expansion of a 1,4,2,3-Diazadiborinine with N-Heterocyclic Carbenes. Chemistry 2019; 25:13572-13578. [PMID: 31429506 PMCID: PMC6856839 DOI: 10.1002/chem.201903259] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Revised: 08/19/2019] [Indexed: 11/28/2022]
Abstract
A 1,4,2,3-diazadiborinine derivative was found to form Lewis adducts with strong two-electron donors such as N-heterocyclic and cyclic (alkyl)(amino)carbenes. Depending on the donor, some of these Lewis pairs are thermally unstable, converting to sole B,N-embedded products upon gentle heating. The products of these reactions, which have been fully characterized by NMR spectroscopy, elemental analysis, and single-crystal X-ray diffraction, were identified as B,N-heterocycles with fused 1,5,2,4-diazadiborepine and 1,4,2-diazaborinine rings. Computational modelling of the reaction mechanism provides insight into the formation of these unique structures, suggesting that a series of B-H, C-N, and B-B bond activation steps are responsible for these "intercalation" reactions between the 1,4,2,3-diazadiborinine and NHCs.
Collapse
Affiliation(s)
- Torsten Thiess
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Soren K. Mellerup
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| | - Holger Braunschweig
- Institute for Sustainable Chemistry & Catalysis with BoronJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
- Institute for Inorganic ChemistryJulius-Maximilians-Universität WürzburgAm Hubland97074WürzburgGermany
| |
Collapse
|
296
|
Ren ZL, Lu WT, Cai S, Xiao MM, Yuan YF, Ping He, Ding MW. Isocyano(triphenylphosphoranylidene)acetates: Key to the One-Pot Synthesis of Oxazolo[4,5-c]quinoline Derivatives via a Sequential Ugi/Wittig/aza-Wittig Cyclization Process. J Org Chem 2019; 84:14911-14918. [DOI: 10.1021/acs.joc.9b02220] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Zhi-Lin Ren
- College of Chemical Engineering, Hubei University of Arts and Science, Xiangyang, Hubei Province 441053, P.R. China
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Central China Normal University, Wuhan 430079, P.R. China
| | - Wen-Ting Lu
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Central China Normal University, Wuhan 430079, P.R. China
| | - Shuang Cai
- College of Chemical Engineering, Hubei University of Arts and Science, Xiangyang, Hubei Province 441053, P.R. China
| | - Mi-Mi Xiao
- College of Chemical Engineering, Hubei University of Arts and Science, Xiangyang, Hubei Province 441053, P.R. China
| | - Yue-Fei Yuan
- College of Chemical Engineering, Hubei University of Arts and Science, Xiangyang, Hubei Province 441053, P.R. China
| | - Ping He
- College of Chemical Engineering, Hubei University of Arts and Science, Xiangyang, Hubei Province 441053, P.R. China
| | - Ming-Wu Ding
- Key Laboratory of Pesticide & Chemical Biology of Ministry of Education, Central China Normal University, Wuhan 430079, P.R. China
| |
Collapse
|
297
|
Abstract
In the last ten years, the combination of Lewis acid with N-heterocyclic carbene (NHC) catalysis has emerged as a powerful strategy in a variety of important asymmetric synthesis, due to the ready availability of starting materials, operational simplicity and mild reaction conditions. Recent findings illustrate that Lewis acid could largely enhance the efficiency and enantioselectivity, reverse the diastereoselectivity, and even influence the pathway of the same reaction partners. Herein, this review aims to reveal the recent advances in NHC-Lewis acid synergistically promoted enantioselective reactions for the expeditious assembly of versatile biologically important chiral pharmaceuticals and natural products.
Collapse
|
298
|
Doddi A, Bockfeld D, Zaretzke M, Bannenberg T, Tamm M. Isolation of Carbene-Stabilized Arsenic Monophosphide [AsP] and its Radical Cation [AsP] +. and Dication [AsP] 2. Chemistry 2019; 25:13119-13123. [PMID: 31433085 PMCID: PMC6856684 DOI: 10.1002/chem.201903795] [Citation(s) in RCA: 26] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2019] [Indexed: 12/11/2022]
Abstract
Arsenic monophosphide (AsP) species supported by two different N-heterocyclic carbenes were prepared by reaction of (IDipp)PSiMe3 (1) (IDipp=1,3-bis(2,6-diisopropylphenyl)imidazolin-2-ylidene) with (IMes)AsCl3 (2) (IMes=1,3-bis(2,4,6-trimethylphenyl)imidazolin-2-ylidene) to afford the dichloride [(IMes)As(Cl)P(IDipp)]Cl (3), which upon reduction with KC8 furnished heteroleptic [(IMes)AsP(IDipp)] (4). The corresponding mono- and dications [(IMes)AsP(IDipp)][PF6 ], [5]PF6 , and [(IMes)AsP(IDipp)][GaCl4 ]2, [6][GaCl4 ]2 , respectively, were prepared by one-electron oxidation of 4 with ferrocenium hexafluorophosphate, [Fc]PF6, or by chloride abstraction from 3 with two equivalents of GaCl3 , respectively. Compounds 4-6 represent rare examples of heterodiatiomic interpnictogen compounds, and X-ray crystal structure determinations together with density functional theory (DFT) calculations reveal a consecutive shortening of the As-P bond lengths and increasing bond order, in agreement with the presence of an arsenic-phosphorus single bond in 4 and a double bond in 62+ . The EPR signal of the cationic radical [5]+. indicates a symmetric spin distribution on the AsP moiety through strong hyperfine coupling with the 75 As and 31 P nuclei.
Collapse
Affiliation(s)
- Adinarayana Doddi
- Department of Chemical SciencesIndian Institute of Science Education and Research Berhampur, Transit Campus, Govt. ITI BuildingEngineering School Road, Ganjam, Berhampur760010OdishaIndia
| | - Dirk Bockfeld
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Marc‐Kevin Zaretzke
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| | - Matthias Tamm
- Institut für Anorganische und Analytische ChemieTechnische Universität BraunschweigHagenring 3038106BraunschweigGermany
| |
Collapse
|
299
|
Nesterov V, Baierl R, Hanusch F, Ferao AE, Inoue S. N-Heterocyclic Carbene-Stabilized Germanium and Tin Analogues of Heavier Nitriles: Synthesis, Reactivity, and Catalytic Application. J Am Chem Soc 2019; 141:14576-14580. [DOI: 10.1021/jacs.9b08741] [Citation(s) in RCA: 39] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Vitaly Nesterov
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching bei München, Germany
| | - Ramona Baierl
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching bei München, Germany
| | - Franziska Hanusch
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching bei München, Germany
| | - Arturo Espinosa Ferao
- Departamento de Química Orgánica, Facultad de Química, Universidad de Murcia, Campus de Espinardo, 30100 Murcia, Spain
| | - Shigeyoshi Inoue
- Department of Chemistry, WACKER-Institute of Silicon Chemistry and Catalysis Research Center, Technische Universität München, Lichtenbergstraße 4, 85748 Garching bei München, Germany
| |
Collapse
|
300
|
Böser R, Denker L, Frank R. Benzyl Borane NHC Adducts: Beyond B−C Bond Scission. Chemistry 2019; 25:10575-10579. [DOI: 10.1002/chem.201902698] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2019] [Indexed: 12/13/2022]
Affiliation(s)
- Richard Böser
- Institute of Inorganic and Analytical ChemistryTechnische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - Lars Denker
- Institute of Inorganic and Analytical ChemistryTechnische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| | - René Frank
- Institute of Inorganic and Analytical ChemistryTechnische Universität Braunschweig Hagenring 30 38106 Braunschweig Germany
| |
Collapse
|