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Pandey PK, Patra M, Ranjan P, Kumar Pal N, Choudhary S, Bera JK. A Single Terminal [Ni II-OH] Catalyst for Direct Julia-Type Olefination and α-Alkylation Involving Sulfones and Alcohols. Chemistry 2024; 30:e202400337. [PMID: 38644351 DOI: 10.1002/chem.202400337] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 04/08/2024] [Accepted: 04/21/2024] [Indexed: 04/23/2024]
Abstract
A terminal [NiII-OH] complex 1, supported by triflamide-functionalized NHC ligands, showed divergent reactivity for the reaction of sulfone with alcohol, contingent on base concentration, temperature, and time. Julia-type olefination of alcohols with sulfones was achieved using one equiv. of base, whereas lowering base loading to 0.5 equiv. afforded α-alkylated sulfones. Besides excellent substrate scope and selectivity, biologically active stilbene derivatives DMU-212, pinosylvin, resveratrol, and piceatannol were synthesized in high yield under Julia-type olefination conditions. An extensive array of controlled experiments and DFT calculations provide valuable insight on the reaction pathway.
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Affiliation(s)
- Prabhakar K Pandey
- Department of Chemistry and Centre for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Moumita Patra
- Department of Chemistry and Centre for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Prabodh Ranjan
- Department of Chemistry and Centre for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Nilay Kumar Pal
- Department of Chemistry and Centre for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Sanjay Choudhary
- Department of Chemistry and Centre for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Jitendra K Bera
- Department of Chemistry and Centre for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
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2
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Ghosh M, Parvin N, Panwaria P, Tothadi S, Bakthavatsalam R, Therambram A, Khan S. Diverse structural reactivity patterns of a POCOP ligand with coinage metals. Dalton Trans 2024; 53:7763-7774. [PMID: 38619861 DOI: 10.1039/d3dt03921h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/16/2024]
Abstract
We have utilised the 4,6-di-tert-butyl resorcinol bis(diphenylphosphinite) (POCOP) ligand for exploring its coordination ability towards group 11 metal centres. The treatment of the bidentate ligand 1 with various coinage metal precursors afforded a wide range of structurally diverse complexes 2-12, depending upon the metal precursors used. This furnishes several multinuclear Cu(I) complexes with dimeric (2) and tetrameric cores (3, 4, and 5). The tetrameric stairstep complex 4 shows thermochromic behaviour, whereas the dimeric complex 2 and tetrameric complex 3 show luminescence properties at cryogenic temperatures. Interestingly, the halide substitution reaction of the dimeric complex 2 with KPPh2 produces a unique mixed phosphine-based tetrameric Cu(I) complex, 5. Treatment of the POCOP ligand with [CuBF4(CH3CN)4] in the presence of 2,2'-bipyridine afforded heteroleptic complex 6, consisting of tri- and tetra-coordinated cationic Cu(I) centres. Furthermore, we could also isolate cubane (8) and stairstep (9) complexes of Ag(I). The cationic Au(I) complex (12) was obtained from the dinuclear Au(I) complex of POCOP, 11. Complex 12 revealed the presence of a strong intramolecular aurophilic interaction with an Au⋯Au bond distance of 3.1143(9) Å. Subsequently, the photophysical properties of these complexes have been studied. All the complexes were characterised by single-crystal X-ray diffraction studies, routine NMR techniques, and mass spectroscopy.
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Affiliation(s)
- Moushakhi Ghosh
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India.
| | - Nasrina Parvin
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India.
| | - Prakash Panwaria
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India.
| | - Srinu Tothadi
- CSIR-Central Salt and Marine Chemicals Research Institute, Gijub Badheka Marg, Bhavnagar 364002, India
| | - Rangarajan Bakthavatsalam
- Department of Chemistry, Indian Institute of Science Education and Research Tirupati, Srinivasapuram-Jangalapalli Village, Tirupati 517619, India
| | - Arshad Therambram
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India.
| | - Shabana Khan
- Department of Chemistry, Indian Institute of Science Education and Research Pune, Dr. Homi Bhabha Road, Pashan, Pune 411008, India.
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3
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Tomsu G, Stöger B, Kirchner K. Synthesis and characterization of pyrrole-based group 4 PNP pincer complexes. MONATSHEFTE FUR CHEMIE 2024; 155:173-181. [PMID: 38440089 PMCID: PMC10908616 DOI: 10.1007/s00706-024-03171-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/01/2023] [Accepted: 01/03/2024] [Indexed: 03/06/2024]
Abstract
The synthesis, characterization, and reactivity of several group 4 metal complexes featuring a central anionic pyrrole moiety connected via CH2 linkers to two phosphine donors is described. Treatment of [P(NH)P-iPr] with [MCl4(THF)2] (M = Zr, Hf) in the presence of base yields the dimeric complexes [M(PNPiPr)(μ-Cl)(Cl)2]2 featuring two bridging chloride ligands. These complexes react with sodium cyclopentadienyl and SiMe3I to give the mononuclear complexes [M(PNPiPr)(η5-Cp)(Cl)2] and [M(PNPiPr)(I)3], respectively. The latter react with MeMgBr to form the trialkyl complexes [M(PNPiPr)(Me)3]. Upon treatment of [Ti(NMe2)4] with [P(NH)P-iPr] a complex with the general formula [Ti(PNPiPr)(NMe2)3] is obtained. DFT calculations revealed that the most stable species is [Ti(κ1N- PNPiPr)(NMe2)3] featuring a κ1N-bound PNP ligand. When [P(NH)P-iPr] is reacted with [Ti(NMe2)4] in CH2Cl2 complex [Ti(PNPiPr)(Cl)2(NMe2)] is formed. Treatment of a solution of [P(NH)P-iPr] and [Zr(NMe2)4] with SiMe3Br affords the anionic seven-coordinate tetrabromo complex [Zr(PNPiPr)(Br)4][H2NMe2]. The corresponding hafnium complex [Hf(PNPiPr)(Br)4][H2NEt2] is obtained in similar fashion by utilizing [Hf(NEt2)4] as metal precursor. All complexes are characterized by means of NMR spectroscopy. Representative complexes were also characterized by X-ray crystallography. Graphical abstract Supplementary Information The online version contains supplementary material available at 10.1007/s00706-024-03171-x.
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Affiliation(s)
- Gerald Tomsu
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
| | - Berthold Stöger
- X-Ray Center, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
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4
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Ameskal M, Taakili R, Gulyaeva ES, Duhayon C, Willot J, Lugan N, Lepetit C, Valyaev DA, Canac Y. Phosphine-NHC-Phosphonium Ylide Pincer Ligand: Complexation with Pd(II) and Unconventional P-Coordination of the Ylide Moiety. Inorg Chem 2023. [PMID: 37996076 DOI: 10.1021/acs.inorgchem.3c03025] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2023]
Abstract
An efficient synthesis of two pincer preligands [Ph2PCH(R)ImCH2CH2CH2PPh3]X2 (R = H, X = OTf; R = Ph, X = BF4) was developed. Subsequent reactions with PdCl2 and an excess of Cs2CO3 led to the formation of highly stable cationic ortho-metalated Pd(II) complexes [(P,C,C,C)Pd]X exhibiting phosphine, NHC, phosphonium ylide, and σ-aryl donor extremities. The protonation of one of the latter complexes with R = H affords the Pd(II) complex [(P,C,C)Pd(MeCN)](OTf)2 bearing an unprecedented nonsymmetrical NHC core pincer scaffold with a 5,6-chelating framework. The overall donor properties of this phosphine-NHC-phosphonium ylide ligand were estimated using the experimental νCN stretching frequency in the corresponding [(P,C,C)Pd(CNtBu](OTf)2 derivative and were shown to be competitive with the related bis(NHC)-phosphonium ylide and phenoxy-NHC-phosphonium ylide pincers. The presence of a phenyl substituent in the bridge between phosphine and NHC moieties in the ortho-metalated complex [(P,C,C,C)Pd](BF4) makes possible the deprotonation of this position using LDA to provide a persistent zwitterionic complex [(P,C,C,C)Pd] featuring a rare P-coordinated phosphonium ylide moiety in addition to a conventional C-coordinated one. The comparison of the 31P and 13C NMR data for these C- and P-bound phosphonium ylide fragments within the same molecule was performed for the first time, and the bonding situation in both cases was studied in detail by QTAIM and ELF topological analyses.
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Affiliation(s)
- Mohammad Ameskal
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
| | - Rachid Taakili
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
| | - Ekaterina S Gulyaeva
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
- A. N. Nesmeyanov Institute of Organoelement Compounds (INEOS), Russian Academy of Sciences, 28/1 Vavilov str., GSP-1, B-334, Moscow 119334, Russia
| | - Carine Duhayon
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
| | - Jérémy Willot
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
| | - Noël Lugan
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
| | - Christine Lepetit
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
| | - Dmitry A Valyaev
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
| | - Yves Canac
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
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5
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Schratzberger H, Stöger B, Veiros LF, Kirchner K. Selective Transfer Semihydrogenation of Alkynes Catalyzed by an Iron PCP Pincer Alkyl Complex. ACS Catal 2023; 13:14012-14022. [PMID: 37942266 PMCID: PMC10629171 DOI: 10.1021/acscatal.3c04156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2023] [Revised: 09/28/2023] [Indexed: 11/10/2023]
Abstract
Two bench-stable Fe(II) alkyl complexes [Fe(κ3PCP-PCP-iPr)(CO)2(R)] (R = CH2CH2CH3, CH3) were obtained by the treatment of [Fe(κ3PCP-PCP-iPr)(CO)2(H)] with NaNH2 and subsequent addition of CH3CH2CH2Br and CH3I, respectively. The reaction proceeds via the anionic Fe(0) intermediate Na[Fe(κ3PCP-PCP-iPr)(CO)2]. The catalytic performance of both alkyl complexes was investigated for the transfer hydrogenation of terminal and internal alkynes utilizing PhSiH3 and iPrOH as a hydrogen source. Precatalyst activation is initiated by migration of the alkyl ligand to the carbonyl C atom of an adjacent CO ligand. In agreement with previous findings, the rate of alkyl migration follows the order nPr > Me. Accordingly, [Fe(κ3PCP-PCP-iPr)(CO)2(CH2CH2CH3)] is the more active catalyst. The reaction takes place at 25 °C with a catalyst loading of 0.5 mol%. There was no overhydrogenation, and in the case of internal alkynes, exclusively, Z-alkenes are formed. The implemented protocol tolerates a variety of electron-donating and electron-withdrawing functional groups including halides, nitriles, unprotected amines, and heterocycles. Mechanistic investigations including deuterium labeling studies and DFT calculations were undertaken to provide a reasonable reaction mechanism.
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Affiliation(s)
- Heiko Schratzberger
- Institute
of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, A-1060 Wien, Austria
| | - Berthold Stöger
- X-Ray
Center, TU Wien, Getreidemarkt 9/163, A-1060 Wien, Austria
| | - Luis F. Veiros
- Centro
de
Química Estrutural, Institute of Molecular Sciences, Departamento
de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049 001 Lisboa, Portugal
| | - Karl Kirchner
- Institute
of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, A-1060 Wien, Austria
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6
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Tomsu G, Stöger B, Kirchner K. Pyrrole-Based Ti(III) and Ti(IV) PNP Pincer Complexes: Insertion of Ketones into the Ti(IV)-Phosphorus Bond. Organometallics 2023; 42:2999-3004. [PMID: 37886626 PMCID: PMC10598877 DOI: 10.1021/acs.organomet.3c00327] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2023] [Indexed: 10/28/2023]
Abstract
The synthesis, characterization, and reactivity of pyrrole-based Ti(III) and Ti(IV) PNP pincer complexes are described. [P(NH)P-iPr] (1) reacts with [TiCl4(THF)2] at room temperature in the presence of NEt3 to afford the Ti(IV) complex [Ti(PNPiPr)(Cl)3]. This complex reacts with acetone and cyclopentanone to give complexes [Ti(PNOacet-iPr)(Cl)3] and [Ti(PNOcyclo-iPr)(Cl)3], respectively. Insertion of the ketone into the Ti(IV)-P bond took place, forming a new tridendate PNO-ligand. Treatment of [TiCl3(THF)3] with the lithium salt of [P(NH)P-iPr] afforded, upon workup, complex [Ti(PNP-iPr)(Cl)2(THF)], a paramagnetic complex with an μeff value of 1.8(1) μB which corresponds to one unpaired electron and a formal oxidation state of +III. This compound does not react with ketones. A mechanistic proposal based on DFT calculations is presented. Ketone insertion proceeds via an associative reaction initiated by ketone coordination at the metal center, followed by the opening of the five-membered chelate ring, and finally an intramolecular nucleophilic attack of the noncoordinated phosphine arm at the carbonyl atom of the ketone. All complexes were characterized by X-ray crystallography.
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Affiliation(s)
- Gerald Tomsu
- Institute
of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, A-1060 Wien, Austria
| | - Berthold Stöger
- X-ray
Center, TU Wien, Getreidemarkt
9/163, A-1060 Wien, Austria
| | - Karl Kirchner
- Institute
of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, A-1060 Wien, Austria
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7
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Käfer MG, Eder W, Pecak J, Stöger B, Pignitter M, Veiros LF, Kirchner K. Cr(II) and Cr(III) NCN pincer complexes: synthesis, structure, and catalytic reactivity. MONATSHEFTE FUR CHEMIE 2023; 154:1263-1273. [PMID: 37927401 PMCID: PMC10620270 DOI: 10.1007/s00706-023-03128-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 09/13/2023] [Indexed: 11/07/2023]
Abstract
The synthesis, characterization, and reactivity of several new Cr(II) and Cr(III) complexes featuring an NCN pincer ligand with an arene backbone connected to amine donors NEt2 and NiPr2 via CH2-linkers is described. Reacting the in situ lithiated ligand precursor N(C-Br)NCH2-Et with [CrCl3(THF)3] resulted in the formation of the Cr(III) complex trans-[Cr(κ3NCN-NCNCH2-Et)(Cl)2(THF)]. Upon reaction of lithiated N(C-Br)NCH2-iPr with a suspension of anhydrous CrCl2, the Cr(II) complex [Cr(κ2NC-NCNCH2-iPr)2] is formed featuring two NCN ligands bound in κ2NC-fashion. In contrast, when lithiated N(C-Br)NCH2-iPr is reacted with a homogeneous solution of anhydrous CrX2 (X = Cl, Br), complexes [Cr(κ3NCN-NCNCH2-iPr)X] are obtained. Treatment of [Cr(κ3NCN-NCNCH2-iPr)Cl] with 1 equiv of PhCH2MgCl and LiCH2SiMe3 afforded the alkyl complexes [Cr(κ3NCN-NCNCH2-iPr)(CH2Ph)] and [Cr(κ3NCN-NCNCH2-iPr)(CH2SiMe3)]. All Cr(II) complexes exhibit effective magnetic moments in the range of 4.7-4.9 µB which is indicative for d4 high spin systems. If a solution of lithiated N(C-Br)NCH2-iPr is treated with CrCl2, followed by addition of an excess of Na[HB(Et)3], the dimeric complex [Cr(κ2NC-NCNCH2-iPr)(μ2-H)]2 is obtained bearing two bridging hydride ligands. [Cr(κ3NCN-NCNCH2-iPr)(CH2SiMe3)] turned out to be catalytically active for the hydrosilylation of ketones at room temperature with a catalyst loading of 1 mol%. X-ray structures of all complexes are presented. Graphical abstract Supplementary Information The online version contains supplementary material available at 10.1007/s00706-023-03128-6.
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Affiliation(s)
- Matthias G. Käfer
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
| | - Wolfgang Eder
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
| | - Jan Pecak
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
| | - Berthold Stöger
- X-Ray Center, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
| | - Marc Pignitter
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, Althanstraße 14, 1090 Vienna, Austria
| | - Luis F. Veiros
- Centro de Química Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049 001 Lisbon, Portugal
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
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Schratzberger H, Liebminger LA, Stöger B, Veiros LF, Kirchner K. Base metal complexes featuring a new pyrazole-derived PCP pincer ligand. Dalton Trans 2023; 52:12410-12422. [PMID: 37594380 DOI: 10.1039/d3dt02111d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/19/2023]
Abstract
A new pyrazole-derived PCP pincer ligand featuring a 1-methylpyrazole backbone tethered to two di(isopropyl)phosphine moieties via phenylene spacers (P(CH)P-iPr) was prepared. When reacting the ligand with group six carbonyl complexes [M(CO)6] (M = Cr, Mo, W) at 130 °C, complexes of the type [M(κ2PN-PCP-iPr)(CO)4] were obtained featuring a κ2P,N-bound ligand with a pendant phosphine arm. Upon an increase of the reaction temperature to 150 °C, in the case of molybdenum, the formation of the complex [Mo(κ3PCP-PCP-iPr)(CO)3] was observed featuring a weak Mo-C bond. DFT calculations reveal that there is no agostic η2-C-H interaction. Treatment of [Mn2(CO)10], [Fe2(CO)9], [Co2(CO)8] and [Ni(COD)2] afforded complexes [Mn(κ3PCP-PCP-iPr)(CO)3], [Fe(κ3PCP-PCP-iPr)(H)(CO)2], [Co(κ3PCP-PCP-iPr)(CO)2] and [Ni(κ3PCP-PCP-iPr)(H)], respectively, where the PCP ligand is coordinated in the typical meridional κ3-fashion. Postfunctionalization of the anionic PCP pincer ligand was possible via N-methylation of the second nitrogen atom of the pyrazole unit with the oxonium salt [Me3O]BF4. Treatment of [Mn(κ3PCP-PCP-iPr)(CO)3] and [Fe(κ3PCP-PCP-iPr)(H)(CO)2] with [Me3O]BF4 resulted in the formation of the cationic complexes [Mn(κ3PCP-PCPMe-iPr)(CO)3]+ and [Fe(κ3PCP-PCPMe-iPr)(Cl)(CO)2]+. In the case of the latter, the chloride ligand seems to originate from the solvent CH2Cl2 undergoing a hydride chloride exchange. All complexes were characterized by means of 1H, 13C{1H}, and 31P{1H} NMR spectroscopy, IR spectroscopy and HR-MS. In addition, the structures of representative complexes were determined by X-ray crystallography.
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Affiliation(s)
- Heiko Schratzberger
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9, A-1060 Vienna, Austria.
| | - Lorenzo A Liebminger
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9, A-1060 Vienna, Austria.
| | - Berthold Stöger
- X-Ray Center, TU Wien, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Luis F Veiros
- Centro de Química Estrutural, Institute of Molecular Sciences, Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais, 1049 001 Lisboa, Portugal
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9, A-1060 Vienna, Austria.
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Schratzberger H, Himmelbauer D, Eder W, Weiser M, Stöger B, Kirchner K. Solvothermal synthesis of cobalt PCP pincer complexes from [Co 2(CO) 8]. MONATSHEFTE FUR CHEMIE 2023; 154:1253-1262. [PMID: 37927400 PMCID: PMC10620272 DOI: 10.1007/s00706-023-03123-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Accepted: 08/23/2023] [Indexed: 11/07/2023]
Abstract
Treatment of [Co2(CO)8] with the ipso-substituted P(C-X)PY ligands (X = Br, Cl; R = iPr, tBu) bearing Y = NH and CH2 linkers under solvothermal conditions affords the five-coordinate Co(I) and Co(III) complexes [CoI(PCPY-R)(CO)2] and [CoIII(PCPY-R)X2]. The later are paramagnetic exhibiting a solution magnetic moment in the range of 3.0-3.3 μB which is consistent with a d6 intermediate spin system corresponding to two unpaired electrons. In the case of P(C-X)PY ligands (X = Br, Cl; R = tBu; Y = NH) the formation of the square planar Co(II) complex [Co(PCPNH-tBu)X] was favored. This complex gives rise to a magnetic moment of 1.8 μB being consistent with a d7 low spin system corresponding to one unpaired electron. All complexes are characterized by means of spectroscopic techniques (NMR, IR), HR-MS. Representative complexes were also characterized by X-ray crystallography. Graphical abstract Supplementary Information The online version contains supplementary material available at 10.1007/s00706-023-03123-x.
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Affiliation(s)
- Heiko Schratzberger
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
| | - Daniel Himmelbauer
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
| | - Wolfgang Eder
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
| | - Michael Weiser
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
| | - Berthold Stöger
- X-Ray Center, TU Vienna, Getreidemarkt 9/163-AC, 1060 Wien, Austria
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry, TU Wien, Getreidemarkt 9/163-AC, 1060 Vienna, Austria
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Esteruelas MA, Moreno-Blázquez S, Oliván M, Oñate E. Competition between N, C, N-Pincer and N, N-Chelate Ligands in Platinum(II). Inorg Chem 2023; 62:10152-10170. [PMID: 37343120 PMCID: PMC11003652 DOI: 10.1021/acs.inorgchem.3c00694] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2023] [Indexed: 06/23/2023]
Abstract
Replacement of the chloride ligand of PtCl{κ3-N,C,N-[py-C6HR2-py]} (R = H (1), Me (2)) and PtCl{κ3-N,C,N-[py-O-C6H3-O-py]} (3) by hydroxido gives Pt(OH){κ3-N,C,N-[py-C6HR2-py]} (R = H (4), Me (5)) and Pt(OH){κ3-N,C,N-[py-O-C6H3-O-py]} (6). These compounds promote deprotonation of 3-(2-pyridyl)pyrazole, 3-(2-pyridyl)-5-methylpyrazole, 3-(2-pyridyl)-5-trifluoromethylpyrazole, and 2-(2-pyridyl)-3,5-bis(trifluoromethyl)pyrrole. The coordination of the anions generates square-planar derivatives, which in solution exist as a unique species or equilibria between isomers. Reactions of 4 and 5 with 3-(2-pyridyl)pyrazole and 3-(2-pyridyl)-5-methylpyrazole provide Pt{κ3-N,C,N-[py-C6HR2-py]}{κ1-N1-[R'pz-py]} (R = H; R' = H (7), Me (8). R = Me; R' = H (9), Me (10)), displaying κ1-N1-pyridylpyrazolate coordination. A 5-trifluoromethyl substituent causes N1-to-N2 slide. Thus, 3-(2-pyridyl)-5-trifluoromethylpyrazole affords equilibria between Pt{κ3-N,C,N-[py-C6HR2-py]}{κ1-N1-[CF3pz-py]} (R = H (11a), Me (12a)) and Pt{κ3-N,C,N-[py-C6HR2-py]}{κ1-N2-[CF3pz-py]} (R = H (11b), Me (12b)). 1,3-Bis(2-pyridyloxy)phenyl allows the chelating coordination of the incoming anions. Deprotonations of 3-(2-pyridyl)pyrazole and its substituted 5-methyl counterpart promoted by 6 lead to equilibria between Pt{κ3-N,C,N-[pyO-C6H3-Opy]}{κ1-N1-[R'pz-py]} (R' = H (13a), Me (14a)) with a κ-N1-pyridylpyrazolate anion, keeping the pincer coordination of the di(pyridyloxy)aryl ligand, and Pt{κ2-N,C-[pyO-C6H3(Opy)]}{κ2-N,N-[R'pz-py]} (R' = H (13c), Me (14c)) with two chelates. Under the same conditions, 3-(2-pyridyl)-5-trifluoromethylpyrazole generates the three possible isomers: Pt{κ3-N,C,N-[pyO-C6H3-Opy]}{κ1-N1-[CF3pz-py]} (15a), Pt{κ3-N,C,N-[pyO-C6H3-Opy]}{κ1-N2-[CF3pz-py]} (15b), and Pt{κ2-N,C-[pyO-C6H3(Opy)]}{κ2-N,N-[CF3pz-py]} (15c). The N1-pyrazolate atom produces a remote stabilizing effect on the chelating form, pyridylpyrazolates being better chelate ligands than pyridylpyrrolates. Accordingly, reactions of 4-6 with 2-(2-pyridyl)-3,5-bis(trifluoromethyl)pyrrole yield Pt{κ3-N,C,N-[py-C6HR2-py]}{κ1-N1-[(CF3)2C4(py)HN]} (R = H (16), Me (17)) or Pt{κ3-N,C,N-[pyO-C6H3-Opy]}{κ1-N1-[(CF3)2C4(py)HN]} (18), displaying κ1-N1-pyrrolate coordination. Complexes 7-10 are efficient green phosphorescent emitters (488-576 nm). In poly(methyl methacrylate) (PMMA) films and in dichloromethane, they experience self-quenching, due to molecular stacking. Aggregation occurs through aromatic π-π interactions, reinforced by weak platinum-platinum interactions.
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Affiliation(s)
- Miguel A. Esteruelas
- Departamento de Química
Inorgánica, Instituto de Síntesis Química y Catálisis
Homogénea (ISQCH), Centro de Innovación en Química
Avanzada (ORFEO-CINQA), Universidad de Zaragoza—CSIC, 50009 Zaragoza, Spain
| | - Sonia Moreno-Blázquez
- Departamento de Química
Inorgánica, Instituto de Síntesis Química y Catálisis
Homogénea (ISQCH), Centro de Innovación en Química
Avanzada (ORFEO-CINQA), Universidad de Zaragoza—CSIC, 50009 Zaragoza, Spain
| | - Montserrat Oliván
- Departamento de Química
Inorgánica, Instituto de Síntesis Química y Catálisis
Homogénea (ISQCH), Centro de Innovación en Química
Avanzada (ORFEO-CINQA), Universidad de Zaragoza—CSIC, 50009 Zaragoza, Spain
| | - Enrique Oñate
- Departamento de Química
Inorgánica, Instituto de Síntesis Química y Catálisis
Homogénea (ISQCH), Centro de Innovación en Química
Avanzada (ORFEO-CINQA), Universidad de Zaragoza—CSIC, 50009 Zaragoza, Spain
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11
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Antibacterial activity and molecular studies of non-symmetric POCOP-Pd(II) pincer complexes derived from 2,4-dihydroxybenzaldehyde (2,4-DHBA). Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116115] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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12
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Jayaprakash H, Coburger P, Wörle M, Togni A, Grützmacher H. Recyclable Mn(I) Catalysts for Base‐Free Asymmetric Hydrogenation: Mechanistic, DFT and Catalytic Studies. Chemistry 2022; 28:e202201522. [PMID: 35652608 PMCID: PMC9540457 DOI: 10.1002/chem.202201522] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2022] [Indexed: 11/07/2022]
Abstract
We report here a mechanistic, DFT and catalytic study on a series of Mn(I) complexes 1, 2(a–d), 3, 4. The studies apprehended the requirements for Mn(I) complexes to be active in both asymmetric direct (AH) and transfer hydrogenations (ATH). The investigations disclosed 6 vital factors accelerating the formation of a resting species, which plays a significant role in lowering the activities of the Mn(I) complex 1 in ATH and AH, respectively. In addition, we also report here a base free Mn(I) catalyzed ATH of aryl alkyl ketones with high enantioselectivity (up to 98 % ee) and improved activity. More significantly, a novel and simple single‐step process for recycling the resting species from the catalytic leftover has been discovered. Notably, the studies provide evidence for the existence of two different temperature dependent mechanisms for AH and ATH, in contrast to previous studies on related systems.
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Affiliation(s)
- Harikrishnan Jayaprakash
- Department of Chemistry and Applied Biosiences Swiss Federal Institute of Technology (ETH) Zürich 8093 Zürich Switzerland
| | - Peter Coburger
- Department of Chemistry and Applied Biosiences Swiss Federal Institute of Technology (ETH) Zürich 8093 Zürich Switzerland
| | - Michael Wörle
- Department of Chemistry and Applied Biosiences Swiss Federal Institute of Technology (ETH) Zürich 8093 Zürich Switzerland
| | - Antonio Togni
- Department of Chemistry and Applied Biosiences Swiss Federal Institute of Technology (ETH) Zürich 8093 Zürich Switzerland
| | - Hansjorg Grützmacher
- Department of Chemistry and Applied Biosiences Swiss Federal Institute of Technology (ETH) Zürich 8093 Zürich Switzerland
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13
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Zhang J, Huang W, Han K, Song G, Hu S. Scandium, titanium and vanadium complexes supported by PCP-type pincer ligands: synthesis, structure, and styrene polymerization activity. Dalton Trans 2022; 51:12250-12257. [PMID: 35895309 DOI: 10.1039/d2dt01389d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of first-row early transition metal dialkyl complexes bearing pincer ligands [(POCOP)M(CH2SiMe3)2] (POCOP: (2,6-(tBu2PO)2-C6H3); 1-Sc: M = Sc; 1-Ti: M = Ti; 1-V: M = V) and [(PCP)M(CH2SiMe3)2] (PCP: (2,6-(tBu2PCH2)2-C6H3); 2-Sc: M = Sc; 2-Ti: M = Ti) have been synthesized. These dialkyl complexes were characterized by single-crystal X-ray diffraction, NMR spectroscopy, and solution magnetic susceptibility (Evans method) analyses appropriately. All the complexes exhibited square pyramidal geometries with different extents of distortion. The activities of these complexes were further explored in styrene polymerization, in which combinations of scandium complexes (1-Sc or 2-Sc) with [Ph3C][B(C6F5)4] were found to be active catalytic systems for highly syndiospecific (>99% rrrr) polymerization of styrene. Meanwhile, the Ti(III) complexes 1-Ti and 2-Ti showed rather low activity in styrene polymerization, which stands in sharp contrast to those in previous reports involving Ti(III) catalysts bearing cyclopentadienyl derivative ligands.
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Affiliation(s)
- Jiayu Zhang
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, People's Republic of China.
| | - Wenshuang Huang
- College of Chemistry, Beijing Normal University, No. 19, Xin-wai street, Beijing 100875, People's Republic of China.
| | - Kailing Han
- College of Chemistry, Beijing Normal University, No. 19, Xin-wai street, Beijing 100875, People's Republic of China.
| | - Guoyong Song
- Beijing Key Laboratory of Lignocellulosic Chemistry, Beijing Forestry University, Beijing 100083, People's Republic of China.
| | - Shaowei Hu
- College of Chemistry, Beijing Normal University, No. 19, Xin-wai street, Beijing 100875, People's Republic of China.
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14
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Zhao M, Li X, Zhang X, Shao Z. Efficient Synthesis of C3-Alkylated and Alkenylated Indoles via Manganese-Catalyzed Dehydrogenation. Chem Asian J 2022; 17:e202200483. [PMID: 35771722 DOI: 10.1002/asia.202200483] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2022] [Revised: 06/15/2022] [Indexed: 11/10/2022]
Abstract
The catalytic dehydrogenation of alcohols is essential for the sustainable production of valuable products. This provids a new strategy for green organic synthesis in chemical industries. Herein, we describe a manganese-based catalytic system that enables the efficient synthesis of C3-alkylated indoles from benzyl alcohols and indoles via the borrowing hydrogen process. Furthermore, dehydrogenative coupling of 2-arylethanols and indoles yields C3-alkenylated indoles. Meanwhile, reacting 2-aminophenethanol instead of indoles can also obtain the corresponding indole products with high selectivity under the same conditions.
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Affiliation(s)
- Mingqin Zhao
- Henan University, College of Tobacco Science, CHINA
| | - Xinyan Li
- Henan Agricultural University, College of Tobacco Science, CHINA
| | - Xiaoyu Zhang
- Henan Agricultural University, College of Tobacco Science, CHINA
| | - Zhihui Shao
- Henan Agricultural University, College of Tobacco Science, Wenhua Road, 450002, Zhengzhou, CHINA
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15
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Ramos VM, de Oliveira-Filho AGS, de Lima Batista AP. Homogeneous Catalytic CO 2 Hydrogenation by [Fe]-Hydrogenase Bioinspired Complexes: A Computational Study. J Phys Chem A 2022; 126:2082-2090. [PMID: 35345882 DOI: 10.1021/acs.jpca.1c09761] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Computational modeling at the DLPNO-CCSD(T)/CBS//M06-L/def2-TZVP level of theory was used to propose four different iron catalysts whose structures were inspired on the [Fe]-hydrogenase active site: [Fe(MePNNHNP)(acmp)] (C(1), MePNNHNP = 2,6-bis(dimethylphosphine), acmp = acylmethylpyridine), [Fe(CNNHNC)(acmp)] (C(2), CNNHNC = 2,6-bis(methylimidazol-2-ylidene)), [Fe(MePNNNP)(acmp)] (D(1), MePNNNP = 2,6-bis((dimethylphosphine)pyridine)), and [Fe(CNNNC)(acmp)] (D(2), CNNNC = 2,6-bis((methylimidazol-2-ylidene) pyridine)). Through these electronic structure calculations, the catalytic mechanism of the reaction was explored. The intermediates and transition states present along the reaction coordinate were identified and described as to their equilibrium geometries, vibrational frequencies, and energies. Quasi-harmonic corrections were performed considering conditions analogous to those used experimentally. To compare the catalytic activities of the studied catalysts, turnover frequencies (TOFs) were calculated. Based on the explored catalytic cycles and TOF values (D(1) > C(1) > D(2) > C(2)), the most suitable iron catalysts are those with tridentate phosphine pincer-type ligands coordinated to the metal center. These systems are new promising iron catalysts to promote the CO2 hydrogenation to formic acid without any use of bases or additives.
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Affiliation(s)
- Vania M Ramos
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901 Ribeirão Preto, São Paulo, Brazil
| | - Antonio G S de Oliveira-Filho
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901 Ribeirão Preto, São Paulo, Brazil
| | - Ana Paula de Lima Batista
- Departamento de Química, Faculdade de Filosofia, Ciências e Letras de Ribeirão Preto, Universidade de São Paulo, 14040-901 Ribeirão Preto, São Paulo, Brazil
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16
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Kishino M, Takaoka S, Shibutani Y, Kusumoto S, Nozaki K. Synthesis and reactivity of PC(sp 3)P-pincer iridium complexes bearing a diborylmethyl anion. Dalton Trans 2022; 51:5009-5015. [PMID: 35296874 DOI: 10.1039/d2dt00513a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel PCP-pincer iridium complexes bearing a diborylmethyl anion were synthesized. Strong σ-electron-donation to the metal and significant π-backdonation from the metal to boron atoms at the β-position were observed both experimentally and computationally. H/D exchange of the aromatic C-H bond proceeded smoothly and, in addition, the α-methine-hydrogen between boron atoms was found to be replaced with deuterium in benzene-d6 solution possibly through diborylcarbene metal complexes as intermediates.
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Affiliation(s)
- Masamichi Kishino
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Satoko Takaoka
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Yuki Shibutani
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Shuhei Kusumoto
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
| | - Kyoko Nozaki
- Department of Chemistry and Biotechnology, Graduate School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan.
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17
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Ahmed KM, Amani K. Synthesis, characterization, and reactivity of a novel magnetically recyclable triazine‐based Cu‐
NNN
‐pincer complex. Appl Organomet Chem 2022. [DOI: 10.1002/aoc.6630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Karzan Mahmood Ahmed
- Department of Chemistry, Faculty of Sciences University of Kurdistan Sanandaj Iran
- Department of Chemistry College of Education, University of Garmian Kalar Kurdistan Region Iraq
| | - Kamal Amani
- Department of Chemistry, Faculty of Sciences University of Kurdistan Sanandaj Iran
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18
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19
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Pecak J, Eder W, Tomsu G, Stöger B, Pignitter M, Kirchner K. Synthesis and Characterization of Cobalt NCN Pincer Complexes. Eur J Inorg Chem 2021; 2021:4280-4285. [PMID: 34819799 PMCID: PMC8596404 DOI: 10.1002/ejic.202100643] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2021] [Revised: 08/31/2021] [Indexed: 11/12/2022]
Abstract
A series of cobalt complexes, stabilized by a monoanionic tridentate NCN pincer ligand, was synthetized and characterized. Preparation of the paramagnetic 15 VE complex [Co(NCNCH2-Et)Br] (1) was accomplished by transmetalation of Li[2,6-(Et2NCH2)2C6H3] with CoBr2 in THF. Treatment of this air-sensitive compound with NO gas resulted in the formation of the diamagnetic Co(III) species [Co(NCNCH2-Et)(NO)Br] (2) as confirmed by X-ray diffraction. This complex features a strongly bent NO ligand (Co-N-O∠135.0°). The νNO is observed at 1609 cm-1 which is typical for a bent metal-N-O arrangement. Coordinatively unsaturated 1 could further be treated with pyridine, isocyanides, phosphines and CO to form five-coordinate 17 VE complexes. Oxidation of 1 with CuBr2 led to the formation of the Co(III) complex [Co(NCNCH2-Et)Br2]. Treatment of [Co(NCNCH2-Et)Br2] with TlBF4 as halide scavenger in acetonitrile led to the formation of the cationic octahedral complex [Co(NCNCH2-Et)(MeCN)3](BF4)2. A combination of X-ray crystallography, IR-, NMR- and EPR-spectroscopy as well as DFT/CAS-SCF calculations were used to characterize all compounds.
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Affiliation(s)
- Jan Pecak
- Institute of Applied Synthetic ChemistryVienna University of TechnologyGetreidemarkt 9A-1060WienAustria
| | - Wolfgang Eder
- Institute of Applied Synthetic ChemistryVienna University of TechnologyGetreidemarkt 9A-1060WienAustria
| | - Gerald Tomsu
- Institute of Applied Synthetic ChemistryVienna University of TechnologyGetreidemarkt 9A-1060WienAustria
| | - Berthold Stöger
- X-Ray CentreVienna University of TechnologyGetreidemarkt 91060WienAustria
| | - Marc Pignitter
- Department of Physiological Chemistry, Faculty of ChemistryUniversity of ViennaAlthanstraße 141090WienAustria
| | - Karl Kirchner
- Institute of Applied Synthetic ChemistryVienna University of TechnologyGetreidemarkt 9A-1060WienAustria
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20
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Yadav D, Singh RK, Singh S, Shirage PM, Singh AK. Cationic ruthenium(II)-NHC pincer complexes with hemilabile COD: Solid-state structural characterization and theoretical study of an η2-(E,Z)-COD ligand. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.122061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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21
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Mboyi CD, Poinsot D, Roger J, Fajerwerg K, Kahn ML, Hierso JC. The Hydrogen-Storage Challenge: Nanoparticles for Metal-Catalyzed Ammonia Borane Dehydrogenation. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 17:e2102759. [PMID: 34411437 DOI: 10.1002/smll.202102759] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 06/23/2021] [Indexed: 06/13/2023]
Abstract
Dihydrogen is one of the sustainable energy vectors envisioned for the future. However, the rapidly reversible and secure storage of large quantities of hydrogen is still a technological and scientific challenge. In this context, this review proposes a recent state-of-the-art on H2 production capacities from the dehydrogenation reaction of ammonia borane (and selected related amine-boranes) as a safer solid source of H2 by hydrolysis (or solvolysis), catalyzed by nanoparticle-based systems. The review groups the results according to the transition metals constituting the catalyst with a mention to their current cost and availability. This includes the noble metals Rh, Pd, Pt, Ru, Ag, as well as cheaper Co, Ni, Cu, and Fe. For each element, the monometallic and polymetallic structures are presented and the performances are described in terms of turnover frequency and recyclability. The structure-property links are highlighted whenever possible. It appears from all these works that the mastery of the preparation of catalysts remains a crucial point both in terms of process, and control and understanding of the electronic structures of the elaborated nanomaterials. A particular effort of the scientific community remains to be made in this multidisciplinary field with major societal stakes.
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Affiliation(s)
- Clève D Mboyi
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB) UMR-CNRS 6302 Université Bourgogne-Franche-Comté (UBFC), 9 avenue Alain Savary, Dijon, 21078, France
| | - Didier Poinsot
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB) UMR-CNRS 6302 Université Bourgogne-Franche-Comté (UBFC), 9 avenue Alain Savary, Dijon, 21078, France
| | - Julien Roger
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB) UMR-CNRS 6302 Université Bourgogne-Franche-Comté (UBFC), 9 avenue Alain Savary, Dijon, 21078, France
| | - Katia Fajerwerg
- Laboratoire de Chimie de Coordination (LCC-CNRS), Université de Toulouse, INPT, 205 route de Narbonne, 31077, Toulouse Cedex 4, France
| | - Myrtil L Kahn
- Laboratoire de Chimie de Coordination (LCC-CNRS), Université de Toulouse, INPT, 205 route de Narbonne, 31077, Toulouse Cedex 4, France
| | - Jean-Cyrille Hierso
- Institut de Chimie Moléculaire de l'Université de Bourgogne (ICMUB) UMR-CNRS 6302 Université Bourgogne-Franche-Comté (UBFC), 9 avenue Alain Savary, Dijon, 21078, France
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22
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Jayaprakash H. Mn(I) phosphine-amino-phosphinites: a highly modular class of pincer complexes for enantioselective transfer hydrogenation of aryl-alkyl ketones. Dalton Trans 2021; 50:14115-14119. [PMID: 34605841 PMCID: PMC8525186 DOI: 10.1039/d1dt02257a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2021] [Accepted: 09/01/2021] [Indexed: 12/22/2022]
Abstract
A series of Mn(I) catalysts with readily accessible and more π-accepting phosphine-amino-phosphinite (P'(O)N(H)P) pincer ligands have been explored for the asymmetric transfer hydrogenation of aryl-alkyl ketones which led to good to high enantioselectivities (up to 98%) compared to other reported Mn-based catalysts for such reactions. The easy tunability of the chiral backbone and the phosphine moieties makes P'(O)N(H)P an alternative ligand framework to the well-known PNP-type pincers.
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Affiliation(s)
- Harikrishnan Jayaprakash
- Department of Chemistry and Applied Biosciences, ETH Zürich, Wolfgang-Pauli-Str. 10, CH-8093 Zürich, Switzerland.
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23
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Eder W, Himmelbauer D, Stöger B, Veiros LF, Pignitter M, Kirchner K. Manganese and iron PCP pincer complexes - the influence of sterics on structure and reactivity. Dalton Trans 2021; 50:13915-13924. [PMID: 34528031 DOI: 10.1039/d1dt02407h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The syntheses of various manganese and iron PCP pincer complexes via a solvothermal oxidative addition methodology is described. Upon reacting [Mn2(CO)10] with the ligands (P(C-Br)PCH2-iPr) (1a) and (P(C-Br)PO-iPr) (1b), Mn(I) PCP pincer complexes [Mn(PCPCH2-iPr)(CO)3] (2a) and [Mn(-PCPO-iPr)(CO)3] (2b) were obtained. Protonation of 2a with HBF4·Et2O led to the formation of [Mn(κ3P,CH,P-P(CH)PCH2-iPr)(CO)3]BF4 (3) featuring an η2-Caryl-H agostic bond. The solvothermal reaction of 1a with [Fe2(CO)9] afforded the Fe(II) PCP pincer complex [Fe(PCPCH2-iPr)(CO)2Br] (4). Treatment of 4 with Li[HBEt3] afforded the Fe(I) complex [Fe(PCPCH2-iPr)(CO)2] (5a). When using the sterically more demanding ligands (P(C-Br)PCH2-tBu) (1c) and (P(C-Br)PO-tBu)(1d) striking differences in reactivity were observed. While neither 1c nor 1d showed any reactivity towards [Mn2(CO)10], the reaction with [Fe2(CO)9] and [Fe(CO)5] led to the formation of the Fe(I) complexes [Fe(PCPCH2-tBu)(CO)2] (5b) and [Fe(PCPO-tBu)(CO)2] (5c). X-ray structures of representative complexes are provided.
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Affiliation(s)
- Wolfgang Eder
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria.
| | - Daniel Himmelbauer
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria.
| | - Berthold Stöger
- X-Ray Center, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Luis F Veiros
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais No. 1, 1049-001 Lisboa, Portugal
| | - Marc Pignitter
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria.
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24
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Himmelbauer D, Schratzberger H, Käfer MG, Stöger B, Veiros LF, Kirchner K. Nonsymmetrical Benzene–Pyridine-Based Nickel Pincer Complexes Featuring Borohydride, Formate, Ethyl, and Nitrosyl Ligands. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00441] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel Himmelbauer
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Heiko Schratzberger
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Matthias G. Käfer
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Berthold Stöger
- X-Ray Center, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Luis F. Veiros
- Centro de Química Estrutural and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
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25
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Martínez‐Prieto LM, Río D, Álvarez E, Palma P, Cámpora J. Nucleophilic Nickel and Palladium Pincer Hydroxides: A Study of Their Reactions with Dimethyl Carbonate and Other Non‐Alkylating Organic Electrophiles. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Luis M. Martínez‐Prieto
- Instituto de Investigaciones Químicas CSIC-Universidad de Sevilla C/Américo Vespucio, 49. 41092 Seville Spain
- Instituto de Tecnología Química CSIC-Universidad Politécnica de Valencia Avda. de Los Naranjos, s/n. 46022 Valencia Spain
| | - Diego Río
- Instituto de Investigaciones Químicas CSIC-Universidad de Sevilla C/Américo Vespucio, 49. 41092 Seville Spain
| | - Eleuterio Álvarez
- Instituto de Investigaciones Químicas CSIC-Universidad de Sevilla C/Américo Vespucio, 49. 41092 Seville Spain
| | - Pilar Palma
- Instituto de Investigaciones Químicas CSIC-Universidad de Sevilla C/Américo Vespucio, 49. 41092 Seville Spain
| | - Juan Cámpora
- Instituto de Investigaciones Químicas CSIC-Universidad de Sevilla C/Américo Vespucio, 49. 41092 Seville Spain
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26
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Yadav D, Misra S, Kumar D, Singh S, Singh AK. Cationic ruthenium(II)–NHC pincer complexes: Synthesis, characterisation and catalytic activity for transfer hydrogenation of ketones. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6287] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dibya Yadav
- Discipline of Chemistry Indian Institute of Technology Indore Indore 453552 India
| | - Shilpi Misra
- Discipline of Chemistry Indian Institute of Technology Indore Indore 453552 India
| | - Dheeraj Kumar
- Discipline of Chemistry Indian Institute of Technology Indore Indore 453552 India
| | - Suryabhan Singh
- Discipline of Chemistry Indian Institute of Technology Indore Indore 453552 India
| | - Amrendra K. Singh
- Discipline of Chemistry Indian Institute of Technology Indore Indore 453552 India
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27
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Kuriyama S, Zhao W, Nishibayashi Y. Synthesis and Characterization of Rhodium Complex Bearing Anionic CNC‐Type Pincer Ligand with Pyrrolide and Imidazo[1,5‐
a
]pyridin‐3‐ylidene Moieties. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Shogo Kuriyama
- Department of Applied Chemistry School of Engineering The University of Tokyo, Hongo Bunkyo-ku Tokyo 113-8656 Japan
| | - Wenhao Zhao
- Department of Applied Chemistry School of Engineering The University of Tokyo, Hongo Bunkyo-ku Tokyo 113-8656 Japan
| | - Yoshiaki Nishibayashi
- Department of Applied Chemistry School of Engineering The University of Tokyo, Hongo Bunkyo-ku Tokyo 113-8656 Japan
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28
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Alberto Rosas‐Ortiz J, Pioquinto‐Mendoza JR, González‐Sebastián L, Hernandez‐Ortega S, Flores‐Alamo M, Morales‐Morales D. Schiff Bases as Inspirational Motif for the Production of Ni(II) and Pd(II) Coordination and Novel Non‐Symmetric Ni(II)‐POCOP Pincer Complexes. Eur J Inorg Chem 2021. [DOI: 10.1002/ejic.202100146] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Jaime Alberto Rosas‐Ortiz
- Instituto de Química, Universidad Nacional Autónoma de México Circuito Exterior Ciudad Universitaria Ciudad de México C.P. 04510 México
| | - J. Roberto Pioquinto‐Mendoza
- Instituto de Química, Universidad Nacional Autónoma de México Circuito Exterior Ciudad Universitaria Ciudad de México C.P. 04510 México
| | - Lucero González‐Sebastián
- Departamento de Química Universidad Autónoma Metropolitana-Iztapalapa Av. San Rafael Atlixco No. 186 Ciudad de México C.P. 09340 México
| | - Simon Hernandez‐Ortega
- Instituto de Química, Universidad Nacional Autónoma de México Circuito Exterior Ciudad Universitaria Ciudad de México C.P. 04510 México
| | - Marcos Flores‐Alamo
- Facultad de Química División de Estudios de Posgrado Universidad Nacional Autónoma de México Circuito Exterior CU, 04510 México
| | - David Morales‐Morales
- Instituto de Química, Universidad Nacional Autónoma de México Circuito Exterior Ciudad Universitaria Ciudad de México C.P. 04510 México
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29
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Structural investigation of the catalytic activity of Fe(III) and Mn(III) Schiff base complexes. Polyhedron 2021. [DOI: 10.1016/j.poly.2021.115206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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30
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Nad P, Mukherjee A. Acceptorless Dehydrogenative Coupling Reactions by Manganese Pincer Complexes. ASIAN J ORG CHEM 2021. [DOI: 10.1002/ajoc.202100249] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Affiliation(s)
- Pinaki Nad
- Department of Chemistry Indian Institute of Technology Bhilai GEC Campus Sejbahar Raipur, Chhattisgarh 492015 India
| | - Arup Mukherjee
- Department of Chemistry Indian Institute of Technology Bhilai GEC Campus Sejbahar Raipur, Chhattisgarh 492015 India
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31
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Krieger AM, Sinha V, Kalikadien AV, Pidko EA. Metal‐ligand cooperative activation of HX (X=H, Br, OR) bond on Mn based pincer complexes. Z Anorg Allg Chem 2021. [DOI: 10.1002/zaac.202100078] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Annika M. Krieger
- Inorganic Systems Engineering, Department of Chemical Engineering, Faculty of Applied Sciences Delft University of Technology van der Maasweg 9 2629 HZ Delft The Netherlands
| | - Vivek Sinha
- Inorganic Systems Engineering, Department of Chemical Engineering, Faculty of Applied Sciences Delft University of Technology van der Maasweg 9 2629 HZ Delft The Netherlands
| | - Adarsh V. Kalikadien
- Inorganic Systems Engineering, Department of Chemical Engineering, Faculty of Applied Sciences Delft University of Technology van der Maasweg 9 2629 HZ Delft The Netherlands
| | - Evgeny A. Pidko
- Inorganic Systems Engineering, Department of Chemical Engineering, Faculty of Applied Sciences Delft University of Technology van der Maasweg 9 2629 HZ Delft The Netherlands
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32
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Matsubara K, Mitsuyama T, Shin S, Hori M, Ishikawa R, Koga Y. Homoleptic Cobalt(II) Phenoxyimine Complexes for Hydrosilylation of Aldehydes and Ketones without Base Activation of Cobalt(II). Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00151] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Kouki Matsubara
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan
| | - Tomoaki Mitsuyama
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan
| | - Sayaka Shin
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan
| | - Momoko Hori
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan
| | - Ryuta Ishikawa
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan
| | - Yuji Koga
- Department of Chemistry, Fukuoka University, 8-19-1 Nanakuma, Fukuoka 814-0180, Japan
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33
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Foo CQ, Sadeer A, Li Y, Pullarkat SA, Leung PH. Access to C-Stereogenic PN(sp2)P Pincer Ligands via Phosphapalladacycle Catalyzed Asymmetric Hydrophosphination. Organometallics 2021. [DOI: 10.1021/acs.organomet.0c00783] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Ce Qing Foo
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Abdul Sadeer
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Yongxin Li
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Sumod A. Pullarkat
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
| | - Pak-Hing Leung
- School of Physical and Mathematical Sciences, Division of Chemistry and Biological Chemistry, Nanyang Technological University, 21 Nanyang Link, Singapore 637371
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34
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Li Y, Krause JA, Guan H. POCOP-type cobalt and nickel pincer complexes bearing an appended phosphinite group. CAN J CHEM 2021. [DOI: 10.1139/cjc-2020-0137] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The reaction of 1,3,5-(iPr2PO)3C6H3 with Co2(CO)8 leads to the isolation of a POCOP-type mononuclear pincer complex {κP,κC,κP-2,4,6-(iPr2PO)3C6H2}Co(CO)2 (1) or a tetranuclear species {κP-{κP,κC,κP-2,4,6-(iPr2PO)3C6H2}Co(CO)2}2Co2(CO)6 (2), depending on the ligand to cobalt ratio employed. The latter compound can be an impurity during the synthesis of {2,6-(iPr2PO)2-4-Me2N-C6H2}Co(CO)2, when the ligand precursor 5-(dimethylamino)resorcinol is contaminated with phloroglucinol due to incomplete monoamination. Similarly, the reaction of 1,3,5-(iPr2PO)3C6H3 with NiCl2 in the presence of 4-dimethylaminopyridine provides {κP,κC,κP-2,4,6-(iPr2PO)3C6H2}NiCl (3) bearing an appended phosphinite group. Structures 1–3 have been studied by X-ray crystallography.
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Affiliation(s)
- Yingze Li
- Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA
- Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA
| | - Jeanette A. Krause
- Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA
- Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA
| | - Hairong Guan
- Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA
- Department of Chemistry, University of Cincinnati, Cincinnati, OH 45221-0172, USA
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35
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Pecak J, Fleissner S, Veiros LF, Pittenauer E, Stöger B, Kirchner K. Synthesis and Catalytic Reactivity of Cobalt Pincer Nitrosyl Hydride Complexes. Organometallics 2021; 40:278-285. [PMID: 33519014 PMCID: PMC7842137 DOI: 10.1021/acs.organomet.0c00755] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2020] [Indexed: 11/30/2022]
Abstract
The synthesis, characterization, and catalytic activity of low-spin {CoNO}8 pincer complexes of the type [Co(PCP)(NO)(H)] are described. These compounds are obtained either by reacting [Co(PCP)(κ2-BH4)] with NO and Et3N or, alternatively, by reacting [Co(PCP)(NO)]+ with boranes, such as NH3·BH3 in solution. The five-coordinate, diamagnetic Co(III) complex [Co(PCPNMe-iPr)(NO)(H)] was found to be the active species in the hydroboration of alkenes with anti-Markovnikov selectivity. A range of aromatic and aliphatic alkenes were efficiently converted with pinacolborane (HBpin) under mild conditions in good to excellent yield. Mechanistic insight into the catalytic reaction is provided by means of isotope labeling, NMR spectroscopy, and APCI/ESI-MS as well as DFT calculations.
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Affiliation(s)
- Jan Pecak
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Sarah Fleissner
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Luis F Veiros
- Centro de Química Estrutural and Departamento de Engenharia Química, Instituto Superior Técnico, Universidade de Lisboa, Av Rovisco Pais, 1049-001 Lisboa, Portugal
| | - Ernst Pittenauer
- Institute of Chemical Technologies and Analytics, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Berthold Stöger
- X-Ray Center, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
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36
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Application of bis(phosphinite) pincer nickel complexes to the catalytic hydrosilylation of aldehydes. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2020.120088] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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37
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Arora V, Narjinari H, Nandi PG, Kumar A. Recent advances in pincer-nickel catalyzed reactions. Dalton Trans 2021; 50:3394-3428. [PMID: 33595564 DOI: 10.1039/d0dt03593a] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Organometallic catalysts have played a key role in accomplishing numerous synthetically valuable organic transformations that are either otherwise not possible or inefficient. The use of precious, sparse and toxic 4d and 5d metals are an apparent downside of several such catalytic systems despite their immense success over the last several decades. The use of complexes containing Earth-abundant, inexpensive and less hazardous 3d metals, such as nickel, as catalysts for organic transformations has been an emerging field in recent times. In particular, the versatile nature of the corresponding pincer-metal complexes, which offers great control of their reactivity via countless variations, has garnered great interest among organometallic chemists who are looking for greener and cheaper alternatives. In this context, the current review attempts to provide a glimpse of recent developments in the chemistry of pincer-nickel catalyzed reactions. Notably, there have been examples of pincer-nickel catalyzed reactions involving two electron changes via purely organometallic mechanisms that are strikingly similar to those observed with heavier Pd and Pt analogues. On the other hand, there have been distinct differences where the pincer-nickel complexes catalyze single-electron radical reactions. The applicability of pincer-nickel complexes in catalyzing cross-coupling reactions, oxidation reactions, (de)hydrogenation reactions, dehydrogenative coupling, hydrosilylation, hydroboration, C-H activation and carbon dioxide functionalization has been reviewed here from synthesis and mechanistic points of view. The flurry of global pincer-nickel related activities offer promising avenues in catalyzing synthetically valuable organic transformations.
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Affiliation(s)
- Vinay Arora
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India.
| | - Himani Narjinari
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India.
| | - Pran Gobinda Nandi
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India.
| | - Akshai Kumar
- Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India. and Centre for Nanotechnology, Indian Institute of Technology Guwahati, Guwahati-781039, Assam, India
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38
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Yan J, Wang Y, Hou S, Shi L, Zhu X, Hao X, Song M. NCC Pincer Ni (II) Complexes Catalyzed Hydrophosphination of Nitroalkenes with Diphenylphosphine. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.5954] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Jing Yan
- College of Chemistry Zhengzhou University No. 100 of Science Road Zhengzhou Henan 450001 P. R. China
| | - Yan‐Bing Wang
- College of Chemistry Zhengzhou University No. 100 of Science Road Zhengzhou Henan 450001 P. R. China
| | - Senyao Hou
- College of Chemistry Zhengzhou University No. 100 of Science Road Zhengzhou Henan 450001 P. R. China
| | - Linlin Shi
- College of Chemistry Zhengzhou University No. 100 of Science Road Zhengzhou Henan 450001 P. R. China
| | - Xinju Zhu
- College of Chemistry Zhengzhou University No. 100 of Science Road Zhengzhou Henan 450001 P. R. China
| | - Xin‐Qi Hao
- College of Chemistry Zhengzhou University No. 100 of Science Road Zhengzhou Henan 450001 P. R. China
| | - Mao‐Ping Song
- College of Chemistry Zhengzhou University No. 100 of Science Road Zhengzhou Henan 450001 P. R. China
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39
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Synthesis and characterization of non-symmetric Ni(II)- and Pd(II)-POCOP pincer complexes derived from 1,7-naphthalenediol. Evaluation of their catalytic activity in Suzuki-Miyaura couplings. Inorganica Chim Acta 2020. [DOI: 10.1016/j.ica.2020.119920] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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40
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Affiliation(s)
- Yingze Li
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
| | - Jeanette A. Krause
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
| | - Hairong Guan
- Department of Chemistry, University of Cincinnati, P.O. Box 210172, Cincinnati, Ohio 45221-0172, United States
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41
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Roque‐Ramires MA, Shen L, Le Lagadec R. Synthesis of Non‐Symmetric Ruthenium(II) POCOP Pincer Complexes and Their Bimetallic Derivatives by π‐Coordination of Arenophile Fragments. Eur J Inorg Chem 2020. [DOI: 10.1002/ejic.202000425] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Manuel A. Roque‐Ramires
- Instituto de Química, UNAM, Circuito Exterior s/n Ciudad Universitaria 04510 Ciudad de México Mexico
| | | | - Ronan Le Lagadec
- Instituto de Química, UNAM, Circuito Exterior s/n Ciudad Universitaria 04510 Ciudad de México Mexico
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42
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Pecak J, Eder W, Stöger B, Realista S, Martinho PN, Calhorda MJ, Linert W, Kirchner K. Synthesis, Characterization, and Catalytic Reactivity of {CoNO} 8 PCP Pincer Complexes. Organometallics 2020; 39:2594-2601. [PMID: 32742055 PMCID: PMC7388324 DOI: 10.1021/acs.organomet.0c00167] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Indexed: 11/28/2022]
Abstract
![]()
The reaction of coordinatively
unsaturated Co(II) PCP pincer complexes
with nitric oxide leads to the formation of new, air-stable, diamagnetic mono nitrosyl compounds. The synthesis
and characterization of five- and four-coordinate Co(III) and Co(I)
nitrosyl pincer complexes based on three different ligand scaffolds
is described. Passing NO through a solution of [Co(PCPNMe-iPr)Cl], [Co(PCPO-iPr)Cl] or [Co(PCPCH2-iPr)Br] led to the
formation of the low-spin complex [Co(PCP-iPr)(NO)X]
with a strongly bent NO ligand. Treatment of the latter species with
(X = Cl, Br) AgBF4 led to chloride abstraction and formation
of cationic square-planar Co(I) complexes of the type [Co(PCP-iPr)(NO)]+ featuring a linear NO group. This
reaction could be viewed as a formal two electron reduction of the
metal center by the NO radical from Co(III) to Co(I), if NO is counted
as NO+. Hence, these systems can be described as {CoNO}8 according to the Enemark–Feltham convention. X-ray
structures, spectroscopic and electrochemical data of all nitrosyl
complexes are presented. Preliminary studies show that [Co(PCPNMe-iPr)(NO)]+ catalyzes efficiently
the reductive hydroboration of nitriles with pinacolborane (HBpin)
forming an intermediate {CoNO}8 hydride species.
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Affiliation(s)
- Jan Pecak
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Wolfgang Eder
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Berthold Stöger
- X-Ray Center, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Sara Realista
- Instituto de Tecnologia Química e Biológica António Xavier, ITQB NOVA, Universidade Nova de Lisboa, Av. da República, 2780-157 Oeiras, Portugal
| | - Paulo N Martinho
- BioISI - Biosystems and Integrative Sciences Institute, DQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Maria José Calhorda
- BioISI - Biosystems and Integrative Sciences Institute, DQB, Faculdade de Ciências, Universidade de Lisboa, Campo Grande, 1749-016 Lisboa, Portugal
| | - Wolfgang Linert
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
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43
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Liu W, Leischner T, Li W, Junge K, Beller M. A General Regioselective Synthesis of Alcohols by Cobalt‐Catalyzed Hydrogenation of Epoxides. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002844] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Weiping Liu
- College of Chemistry, Chemical Engineering and Biotechnology Donghua University 201620 Shanghai P. R. China
- Leibniz-Institut für Katalyse e.V. Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Thomas Leischner
- Leibniz-Institut für Katalyse e.V. Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Wu Li
- Leibniz-Institut für Katalyse e.V. Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e.V. Albert-Einstein-Straße 29a 18059 Rostock Germany
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V. Albert-Einstein-Straße 29a 18059 Rostock Germany
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44
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Liu W, Leischner T, Li W, Junge K, Beller M. A General Regioselective Synthesis of Alcohols by Cobalt-Catalyzed Hydrogenation of Epoxides. Angew Chem Int Ed Engl 2020; 59:11321-11324. [PMID: 32196878 PMCID: PMC7383699 DOI: 10.1002/anie.202002844] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Indexed: 11/16/2022]
Abstract
A straightforward methodology for the synthesis of anti‐Markovnikov‐type alcohols is presented. By using a specific cobalt triphos complex in the presence of Zn(OTf)2 as an additive, the hydrogenation of epoxides proceeds with high yields and selectivities. The described protocol shows a broad substrate scope, including multi‐substituted internal and terminal epoxides, as well as a good functional‐group tolerance. Various natural‐product derivatives, including steroids, terpenoids, and sesquiterpenoids, gave access to the corresponding alcohols in moderate‐to‐excellent yields.
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Affiliation(s)
- Weiping Liu
- College of Chemistry, Chemical Engineering and Biotechnology, Donghua University, 201620, Shanghai, P. R. China.,Leibniz-Institut für Katalyse e.V., Albert-Einstein-Straße 29a, 18059, Rostock, Germany
| | - Thomas Leischner
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Straße 29a, 18059, Rostock, Germany
| | - Wu Li
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Straße 29a, 18059, Rostock, Germany
| | - Kathrin Junge
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Straße 29a, 18059, Rostock, Germany
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Straße 29a, 18059, Rostock, Germany
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Taakili R, Canac Y. NHC Core Pincer Ligands Exhibiting Two Anionic Coordinating Extremities. Molecules 2020; 25:molecules25092231. [PMID: 32397416 PMCID: PMC7248942 DOI: 10.3390/molecules25092231] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2020] [Revised: 05/04/2020] [Accepted: 05/06/2020] [Indexed: 01/01/2023] Open
Abstract
The chemistry of NHCcore pincer ligands of LX2 type bearing two pending arms, identical or not, whose coordinating center is anionic in nature, is here reviewed. In this family, the negative charge of the coordinating atoms can be brought either by a carbon atom via a phosphonium ylide (R3P+-CR2-) or by a heteroatom through amide (R2N-), oxide (RO-), or thio(seleno)oxide (RS-, RSe-) donor functionalities. Through selected examples, the synthetic methods, coordination properties, and applications of such tridentate systems are described. Particular emphasis is placed on the role of the donor ends in the chemical behavior of these species.
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Affiliation(s)
- Satyadeep Waiba
- Department of Chemical SciencesIndian Institute of Science Education and Research Kolkata Mohanpur 741246, WB India
| | - Biplab Maji
- Department of Chemical SciencesIndian Institute of Science Education and Research Kolkata Mohanpur 741246, WB India
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47
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Leforestier B, Gyton MR, Chaplin AB. Synthesis and group 9 complexes of macrocyclic PCP and POCOP pincer ligands. Dalton Trans 2020; 49:2087-2101. [PMID: 32031194 DOI: 10.1039/c9dt04835a] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
The synthesis of macrocyclic variants of commonly employed phosphine-based pincer (pro)ligands derived from meta-xylene (PCP-14) and resorcinol (POCOP-14) is described, where the P-donors are trans-substituted with a tetradecamethylene linker. The former was accomplished using a seven-step asymmetric procedure involving (-)-cis-1-amino-2-indanol as a chiral auxiliary and ring-closing olefin metathesis. A related, but non-diastereoselective route was employed for the latter, which consequently necessitated chromatographic separation from the cis-substituted by-product. The proligands are readily metalated and homologous series of MI(CO) and MIIICl2(CO) derivatives (M = Rh, Ir) have been isolated and fully characterised in solution and the solid state. Metal hydride complexes are generated during the synthesis of the former and have been characterised in situ using NMR spectroscopy.
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Affiliation(s)
- Baptiste Leforestier
- Department of Chemistry, University of Warwick, Gibbet Hill Road, Coventry CV4 7AL, UK.
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48
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Daw P, Kumar A, Oren D, Espinosa-Jalapa NA, Srimani D, Diskin-Posner Y, Leitus G, Shimon LJW, Carmieli R, Ben-David Y, Milstein D. Redox Noninnocent Nature of Acridine-Based Pincer Complexes of 3d Metals and C–C Bond Formation. Organometallics 2020. [DOI: 10.1021/acs.organomet.9b00607] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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49
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Recent advances in the chemistry of group 9—Pincer organometallics. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2020. [DOI: 10.1016/bs.adomc.2019.09.002] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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50
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Himmelbauer D, Stöger B, Veiros LF, Pignitter M, Kirchner K. Cr(II) and Cr(I) PCP Pincer Complexes: Synthesis, Structure, and Catalytic Reactivity. Organometallics 2019. [DOI: 10.1021/acs.organomet.9b00651] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Daniel Himmelbauer
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Berthold Stöger
- X-Ray Center, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
| | - Luis F. Veiros
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, Av. Rovisco Pais No. 1, 1049-001 Lisboa, Portugal
| | - Marc Pignitter
- Department of Physiological Chemistry, Faculty of Chemistry, University of Vienna, Althanstrasse 14, 1090 Vienna, Austria
| | - Karl Kirchner
- Institute of Applied Synthetic Chemistry, Vienna University of Technology, Getreidemarkt 9, A-1060 Vienna, Austria
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