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Popovici I, Barthes C, Tannoux T, Duhayon C, Casaretto N, Monari A, Auffrant A, Canac Y. Phosphonium Ylides vs Iminophosphoranes: The Role of the Coordinating Ylidic Atom in cis-[Phosphine-Ylide Rh(CO) 2] Complexes. Inorg Chem 2023; 62:2376-2388. [PMID: 36704899 DOI: 10.1021/acs.inorgchem.2c04151] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The coordinating properties of two families of ylides, namely, phosphonium ylides and iminophosphoranes, differently substituted at the ylidic center (CH2- vs NiPr-), have been investigated in structurally related cationic phosphine-ylide Rh(CO)2 complexes obtained from readily available phosphine-phosphonium salt precursors derived from an ortho-phenylene bridge. However, while the Rh(CO)2 complex bearing the P+-CH2- donor moiety proved to be stable, the P═NiPr donor end appeared to induce lability to one of the CO groups. All of the RhI carbonyl complexes in both ylide series were fully characterized, including through X-ray diffraction analysis. Based on the experimental and calculated infrared (IR) CO stretching frequencies in Rh(CO)2 complexes, we evidenced that the phosphonium ylide ligand is a stronger donor than the iminophosphorane ligand. However, we also found that the difference in the intrinsic electronic properties can be largely compensated by the introduction of an iPr substituent on the N atom of the iminophosphorane, hence pointing to the noninnocent role of the peripheral substituent and opening novel possibilities to tune the properties of metal complexes containing ylide ligands.
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Affiliation(s)
- Ingrid Popovici
- Laboratoire de Chimie Moléculaire (LCM), CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91120 Palaiseau, France
| | - Cécile Barthes
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France
| | - Thibault Tannoux
- Laboratoire de Chimie Moléculaire (LCM), CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91120 Palaiseau, France
| | - Carine Duhayon
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France
| | - Nicolas Casaretto
- Laboratoire de Chimie Moléculaire (LCM), CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91120 Palaiseau, France
| | - Antonio Monari
- ITODYS, Université Paris Cité and CNRS, F-75006 Paris, France
| | - Audrey Auffrant
- Laboratoire de Chimie Moléculaire (LCM), CNRS, École Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91120 Palaiseau, France
| | - Yves Canac
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France
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Valyaev DA, Canac Y. Carbenes and phosphonium ylides: a fruitful association in coordination chemistry. Dalton Trans 2021; 50:16434-16442. [PMID: 34664574 DOI: 10.1039/d1dt03155d] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Among a plethora of σ-donor ligands available, carbon-centered ones have become essential, in particular with the emergence of N-heterocyclic carbenes (NHCs), positioning themselves as credible alternatives to traditional nitrogen- and phosphorus-based systems. Phosphonium ylides representing another class of neutral η1-bonded carbon ligands have also been shown to act as effective Lewis bases. Considering the intrinsic features of the carbene and phosphonium ylide ligands, similar in terms of electronic properties, but different in terms of bonding mode, the design of hybrid systems combining these two types of carbon functionalities appeared to be a natural and exciting challenge. This Perspective comprehensively covers the chemistry of such ligand architectures from synthesis and fundamental aspects to catalytic applications.
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Affiliation(s)
- Dmitry A Valyaev
- LCC-CNRS, Université de Toulouse, CNRS, UPS, Toulouse Cedex 4 31077, France.
| | - Yves Canac
- LCC-CNRS, Université de Toulouse, CNRS, UPS, Toulouse Cedex 4 31077, France.
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Taakili R, Barthes C, Lepetit C, Duhayon C, Valyaev DA, Canac Y. Direct Access to Palladium(II) Complexes Based on Anionic C, C, C-Phosphonium Ylide Core Pincer Ligand. Inorg Chem 2021; 60:12116-12128. [PMID: 34333976 DOI: 10.1021/acs.inorgchem.1c01316] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The reaction of readily available imidazolium-phosphonium salt [MesIm(CH2)3PPh3](OTf)2 with PdCl2 in the presence of an excess of Cs2CO3 afforded selectively in one step the cationic Pd(II) complex [(C,C,C)Pd(NCMe)](OTf) exhibiting an LX2-type NHC-ylide-aryl C,C,C-pincer ligand via formal triple C-H bond activation. The replacement of labile MeCN in the latter by CNtBu and CO fragments allowed to estimate the overall electronic properties of this phosphonium ylide core pincer scaffold incorporating three different carbon-based donor ends by IR spectroscopy, cyclic voltammetry, and molecular orbital analysis, revealing its significantly higher electron-rich character compared to the structurally close NHC core pincer system with two phosphonium ylide extremities. The pincer complex [(C,C,C)Pd(CO)](OTf) represents a rare example of Pd(II) carbonyl species stable at room temperature and characterized by X-ray diffraction analysis. The treatment of isostructural cationic complexes [(C,C,C)Pd(NCMe)](OTf) and [(C,C,C)Pd(CO)](OTf) with (allyl)MgBr and nBuLi led to the formation of zwitterionic phosphonium organopalladates [(C,C,C)PdBr] and [(C,C,C)Pd(COnBu)], respectively.
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Affiliation(s)
- Rachid Taakili
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Cedex 4 Toulouse, France
| | - Cécile Barthes
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Cedex 4 Toulouse, France
| | - Christine Lepetit
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Cedex 4 Toulouse, France
| | - Carine Duhayon
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Cedex 4 Toulouse, France
| | - Dmitry A Valyaev
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Cedex 4 Toulouse, France
| | - Yves Canac
- LCC-CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Cedex 4 Toulouse, France
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Affiliation(s)
- José‐Antonio García‐López
- Grupo de Química Organometálica Departamento de Química Inorgánica Facultad de Química Universidad de Murcia 30100 Murcia Spain
| | - Isabel Saura‐Llamas
- Grupo de Química Organometálica Departamento de Química Inorgánica Facultad de Química Universidad de Murcia 30100 Murcia Spain
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Phosphine-phosphonium ylides as ligands in palladium-catalysed C2-H arylation of benzoxazoles. CHINESE CHEM LETT 2020. [DOI: 10.1016/j.cclet.2020.04.008] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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Taakili R, Barthes C, Goëffon A, Lepetit C, Duhayon C, Valyaev DA, Canac Y. NHC Core Phosphonium Ylide-based Palladium(II) Pincer Complexes: The Second Ylide Extremity Makes the Difference. Inorg Chem 2020; 59:7082-7096. [DOI: 10.1021/acs.inorgchem.0c00561] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Rachid Taakili
- LCC−CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
| | - Cécile Barthes
- LCC−CNRS, Université de Toulouse, CNRS, 205 route de Narbonne, 31077 Toulouse cedex 4, France
| | - Amel Goëffon
- 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
| | - Carine Duhayon
- 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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Taakili R, Lepetit C, Duhayon C, Valyaev DA, Lugan N, Canac Y. Palladium(ii) pincer complexes of a C,C,C-NHC, diphosphonium bis(ylide) ligand. Dalton Trans 2019; 48:1709-1721. [DOI: 10.1039/c8dt04316g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The preparation, characterization, and reactivity of Pd(ii) complexes of the C,C,C-NHC, diphosphonium bis(ylide) pincer ligand of LX2-type are here described.
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Affiliation(s)
| | | | | | | | - Noël Lugan
- LCC-CNRS
- Université de Toulouse
- CNRS
- Toulouse
- France
| | - Yves Canac
- LCC-CNRS
- Université de Toulouse
- CNRS
- Toulouse
- France
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Barthes C, Bijani C, Lugan N, Canac Y. A Palladium(II) Complex of a C4 Chelating Bis(NHC) Diphosphonium Bis(ylide) Ligand. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00405] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Cécile Barthes
- LCC-CNRS, Université de Toulouse, INPT, UPS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France
| | - Christian Bijani
- LCC-CNRS, Université de Toulouse, INPT, UPS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France
| | - Noël Lugan
- LCC-CNRS, Université de Toulouse, INPT, UPS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France
| | - Yves Canac
- LCC-CNRS, Université de Toulouse, INPT, UPS, 205 route de Narbonne, 31077 Toulouse Cedex 4, France
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