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Joven-Sancho D, Baya M, Martín A, Orduna J, Menjón B. The CF 3 Group as a Synthon of the CF + Unit in Palladium Chemistry. Angew Chem Int Ed Engl 2024; 63:e202403108. [PMID: 38606604 DOI: 10.1002/anie.202403108] [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: 02/13/2024] [Revised: 04/10/2024] [Accepted: 04/11/2024] [Indexed: 04/13/2024]
Abstract
The homoleptic trifluoromethyl-palladium(II) complex [Pd(CF3)4]2- (1) is shown to be highly active towards amines. Thus, when treated with primary amines RNH2, it readily undergoes aminolysis of one of the CF3 ligands affording the isocyanide complexes [(CF3)3Pd(CNR)]- (R=aryl). In this process the original CF3 group undergoes total defluorination. Interestingly, the reaction of 1 with secondary amines R2NH proceeds with loss of just two F-substituents, whereby the Fischer-type fluoroaminocarbene complexes [(CF3)3Pd(CFNR2)]- are formed (R=Et, Ph). The reaction of 1 with diamines affords different [(CF3)3Pd(NHC)]- complexes containing sterically non-demanding NHC ligands. Representative examples of various topologies are reported based on the common imidazolidin-2-ylidene or benzimidazolin-2-ylidene rings as well as the expanded-ring perimidin-2-ylidene. This metal-tailored synthetic route, where a CF3 group acts as a pre-carbenic unit, is unprecedented in the vast NHC-chemistry. It takes place under very mild conditions and is envisaged to be extensible to other non-isolable NHC ligands. The key difluorocarbene intermediate [(CF3)3Pd(CF2)]- is experimentally detected.
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Affiliation(s)
- Daniel Joven-Sancho
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH), CSIC-Universidad de Zaragoza, Zaragoza, 50009, Spain
| | - Miguel Baya
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH), CSIC-Universidad de Zaragoza, Zaragoza, 50009, Spain
| | - Antonio Martín
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH), CSIC-Universidad de Zaragoza, Zaragoza, 50009, Spain
| | - Jesús Orduna
- Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Zaragoza, 50009, Spain
| | - Babil Menjón
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH), CSIC-Universidad de Zaragoza, Zaragoza, 50009, Spain
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Joven-Sancho D, Echeverri A, Saffon-Merceron N, Contreras-García J, Nebra N. An Organocopper(III) Fluoride Triggering C-CF 3 Bond Formation. Angew Chem Int Ed Engl 2024; 63:e202319412. [PMID: 38147576 DOI: 10.1002/anie.202319412] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Revised: 12/22/2023] [Accepted: 12/22/2023] [Indexed: 12/28/2023]
Abstract
Copper(III) fluorides are catalytically competent, yet elusive, intermediates in cross-coupling. The synthesis of [PPh4 ][CuIII (CF3 )3 F] (2), the first stable (isolable) CuIII -F, was accomplished via chloride addition to [CuIII (CF3 )3 (py)] (1) yielding [PPh4 ][CuIII (CF3 )3 Cl(py)] (1⋅Cl), followed by treatment with AgF. The CuIII halides 1⋅Cl and 2 were fully characterized using nuclear magnetic resonance (NMR) spectroscopy, single crystal X-ray diffraction (Sc-XRD) and elemental analysis (EA). Complex 2 proved capable of forging C-CF3 bonds from silyl-capped alkynes. In-depth mechanistic studies combining probes, theoretical calculations, trapping of intermediate 4a ([PPh4 ][CuIII (CF3 )3 (C≡CPh)]) and radical tests unveil the key role of the CuIII acetylides that undergo facile 2e- reductive elimination furnishing the trifluoromethylated alkynes (RC≡CCF3 ), which are industrially relevant synthons in drug discovery, pharma and agrochemistry.
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Affiliation(s)
- Daniel Joven-Sancho
- Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA), Université Paul Sabatier, CNRS, 118 Route de Narbonne, 31062, Toulouse, France
| | - Andrea Echeverri
- Laboratoire de Chimie Théorique (LCT), Sorbonne Université, CNRS, 4, Place Jussieu, 75005, Paris, France
| | - Nathalie Saffon-Merceron
- Institut de Chimie de Toulouse ICT-UAR2599, Université Paul Sabatier, CNRS, 31062, Toulouse Cedex, France
| | - Julia Contreras-García
- Laboratoire de Chimie Théorique (LCT), Sorbonne Université, CNRS, 4, Place Jussieu, 75005, Paris, France
| | - Noel Nebra
- Laboratoire Hétérochimie Fondamentale et Appliquée (LHFA), Université Paul Sabatier, CNRS, 118 Route de Narbonne, 31062, Toulouse, France
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Joven‐Sancho D, Baya M, Falvello LR, Martín A, Orduna J, Menjón B. Stability of Ag III towards Halides in Organosilver(III) Complexes. Chemistry 2021; 27:12796-12806. [PMID: 34190377 PMCID: PMC8519087 DOI: 10.1002/chem.202101859] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2021] [Indexed: 11/09/2022]
Abstract
The involvement of silver in two-electron AgI /AgIII processes is currently emerging. However, the range of stability of the required and uncommon AgIII species is virtually unknown. Here, the stability of AgIII towards the whole set of halide ligands in the organosilver(III) complex frame [(CF3 )3 AgX]- (X=F, Cl, Br, I, At) is theoretically analyzed. The results obtained depend on a single factor: the nature of X. Even the softest and least electronegative halides (I and At) are found to form reasonably stable AgIII -X bonds. Our estimates were confirmed by experiment. The whole series of nonradiative halide complexes [PPh4 ][(CF3 )3 AgX] (X=F, Cl, Br, I) has been experimentally prepared and all its constituents have been isolated in pure form. The pseudohalides [PPh4 ][(CF3 )3 AgCN] and [PPh4 ][(CF3 )3 Ag(N3 )] have also been isolated, the latter being the first silver(III) azido complex. Except for the iodo compound, all the crystal and molecular structures have been established by single-crystal X-ray diffraction methods. The decomposition paths of the [(CF3 )3 AgX]- entities at the unimolecular level have been examined in the gas phase by multistage mass spectrometry (MSn ). The experimental detection of the two series of mixed complexes [CF3 AgX]- and [FAgX]- arising from the corresponding parent species [(CF3 )3 AgX]- demonstrate that the Ag-X bond is particularly robust. Our experimental observations are rationalized with the aid of theoretical methods. Smooth variation with the electronegativity of X is also observed in the thermolyses of bulk samples. The thermal stability in the solid state gradually decreases from X=F (145 °C, dec.) to X=I (78 °C, dec.) The experimentally established compatibility of AgIII with the heaviest halides is of particular relevance to silver-mediated or silver-catalyzed processes.
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Affiliation(s)
- Daniel Joven‐Sancho
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH)CSIC-Universidad de ZaragozaC/ Pedro Cerbuna 12, 50009ZaragozaSpain
| | - Miguel Baya
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH)CSIC-Universidad de ZaragozaC/ Pedro Cerbuna 12, 50009ZaragozaSpain
| | - Larry R. Falvello
- Instituto de Nanociencia y Materiales de Aragón (INMA)CSIC-Universidad de Zaragoza C/ Pedro Cerbuna 12, 50009ZaragozaSpain
| | - Antonio Martín
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH)CSIC-Universidad de ZaragozaC/ Pedro Cerbuna 12, 50009ZaragozaSpain
| | - Jesús Orduna
- Instituto de Nanociencia y Materiales de Aragón (INMA)CSIC-Universidad de Zaragoza C/ Pedro Cerbuna 12, 50009ZaragozaSpain
| | - Babil Menjón
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH)CSIC-Universidad de ZaragozaC/ Pedro Cerbuna 12, 50009ZaragozaSpain
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Pérez-Bitrián A, Baya M, Casas JM, Martín A, Menjón B. Hydrogen bonding to metals as a probe for an inverted ligand field. Dalton Trans 2021; 50:5465-5472. [PMID: 33908974 DOI: 10.1039/d1dt00597a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electron-rich, late transition metals are known to act as hydrogen-bonding (HBd) acceptors. In this regard, Pt(ii) centres in square-planar environments are particularly efficient. It is however puzzling that no convincing experimental evidence is currently available for the isoelectronic neighbour Au(iii) being involved in HBd interactions. We report now on the synthesis and characterisation of two series of isoleptic and isoelectronic (d8) compounds [(CF3)3Pt(L)]- and (CF3)3Au(L), where the L ligands are based on the quinoline frame and have been selected to favour HBd with the metal centre. Strong HBd interactions were actually found in the Pt(ii) compounds, based on structural and spectroscopic evidence, and they were further confirmed by theoretical calculations. In contrast, no evidence was obtained in the Au(iii) case. In order to find the reason underlying this general disparity, we undertook a detailed theoretical analysis of the model systems [(CF3)3Pt(py)]- and (CF3)3Au(py). This study revealed that the filled dz2 orbital is the HOMO in the case of Pt(ii), but is buried in the lower energy levels in the case of Au(iii). The sharply different electronic configurations involve ligand-field inversion on going from Pt to the next element Au. This is not a gradual but an abrupt change, which invalidates Au(iii) as a HBd-acceptor wherever ligand-field inversion occurs.
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Affiliation(s)
- Alberto Pérez-Bitrián
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH), CSIC-Universidad de Zaragoza, Zaragoza, Spain.
| | - Miguel Baya
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH), CSIC-Universidad de Zaragoza, Zaragoza, Spain.
| | - José M Casas
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH), CSIC-Universidad de Zaragoza, Zaragoza, Spain.
| | - Antonio Martín
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH), CSIC-Universidad de Zaragoza, Zaragoza, Spain.
| | - Babil Menjón
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH), CSIC-Universidad de Zaragoza, Zaragoza, Spain.
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Fortuño C, Martín A, Mastrorilli P, Gallo V, Todisco S. Solvent-Driven P–S vs P–C Bond Formation from a Diplatinum(III) Complex and Sulfur-Based Anions. Organometallics 2017. [DOI: 10.1021/acs.organomet.7b00746] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Consuelo Fortuño
- Departamento de Química Inorgánica,
Instituto de Síntesis Química y Catálisis Homogénea-ISQCH, Universidad de Zaragoza-CSIC, E-50009 Zaragoza, Spain
| | - Antonio Martín
- Departamento de Química Inorgánica,
Instituto de Síntesis Química y Catálisis Homogénea-ISQCH, Universidad de Zaragoza-CSIC, E-50009 Zaragoza, Spain
| | | | - Vito Gallo
- DICATECh, Politecnico di Bari, I-70125 Bari, Italy
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Pérez-Bitrián A, Baya M, Casas JM, Falvello LR, Martín A, Menjón B. (CF3)3Au as a Highly Acidic Organogold(III) Fragment. Chemistry 2017; 23:14918-14930. [DOI: 10.1002/chem.201703352] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Alberto Pérez-Bitrián
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Miguel Baya
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - José M. Casas
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Larry R. Falvello
- Instituto de Ciencia de Materiales de Aragón (ICMA); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Antonio Martín
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Babil Menjón
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
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Pérez-Bitrián A, Martínez-Salvador S, Baya M, Casas JM, Martín A, Menjón B, Orduna J. Anionic Derivatives of Perfluorinated Trimethylgold. Chemistry 2017; 23:6919-6929. [DOI: 10.1002/chem.201700927] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2017] [Indexed: 11/09/2022]
Affiliation(s)
- Alberto Pérez-Bitrián
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Sonia Martínez-Salvador
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Miguel Baya
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - José M. Casas
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Antonio Martín
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Babil Menjón
- Instituto de Síntesis Química y Catálisis Homogénea (iSQCH); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
| | - Jesús Orduna
- Instituto de Ciencia de Materiales de Aragón (ICMA); CSIC-Universidad de Zaragoza; C/ Pedro Cerbuna 12 50009 Zaragoza Spain
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Organophosphines in organoplatinum complexes structural aspects of PtPC3 and PtP2CX (X = H, F or OL) derivatives. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.03.013] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Romine AM, Nebra N, Konovalov AI, Martin E, Benet-Buchholz J, Grushin VV. Easy Access to the Copper(III) Anion [Cu(CF3)4]−. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411348] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Romine AM, Nebra N, Konovalov AI, Martin E, Benet-Buchholz J, Grushin VV. Easy Access to the Copper(III) Anion [Cu(CF3)4]−. Angew Chem Int Ed Engl 2015; 54:2745-9. [DOI: 10.1002/anie.201411348] [Citation(s) in RCA: 81] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Revised: 12/18/2014] [Indexed: 11/10/2022]
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Preise 2014 der Grupo Especializado de Química Organometálica: J. Lloret-Fillol, E. Fernández und J. Forniés / Hans-G.-A.-Hellmann-Preis: C. Jacob. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201411215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Grupo Especializado de Qubmica Organometlica Awards 2014 / Hans G. A. Hellmann Prize for Christoph Jacob. Angew Chem Int Ed Engl 2014. [DOI: 10.1002/anie.201411215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Martínez-Salvador S, Falvello LR, Martín A, Menjón B. Gold(I) and Gold(III) Trifluoromethyl Derivatives. Chemistry 2013; 19:14540-52. [DOI: 10.1002/chem.201302142] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2013] [Indexed: 12/31/2022]
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