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Cabrera-Lobera N, Del Horno E, Quirós MT, Buñuel E, Gimeno M, Brennessel WW, Neidig ML, Priego JL, Cárdenas DJ. Ni(2,2':6',2''-terpyridine) 2: a high-spin octahedral formal Ni(0) complex. Dalton Trans 2024; 53:8550-8554. [PMID: 38715455 PMCID: PMC11106753 DOI: 10.1039/d3dt04247b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2023] [Accepted: 04/16/2024] [Indexed: 05/22/2024]
Abstract
We have synthesised and characterised the complex Ni(tpy)2 (tpy = 2,2':6',2''-terpyridine). This formally Ni(0) complex is paramagnetic both in the solid state and in solution (S = 2). The crystal structure shows an octahedral geometry, with molecules arranged in independent dimers involving π-stacking between pairs of complexes. Magnetic measurementes and DFT calculations suggest the existence of temperature-dependent intermolecular antiferromagnetic coupling in the solid state.
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Affiliation(s)
- Natalia Cabrera-Lobera
- Department of Organic Chemistry, Facultad de Ciencias, Universidad Autónoma de Madrid, Institute for Advanced Research in Chemical Sciences (IAdChem), Red ORFEO-CINQA, Av. Francisco Tomás y Valiente 7, Campus de Cantoblanco, 28049, Madrid, Spain.
| | - Estefanía Del Horno
- Department of Organic Chemistry, Facultad de Ciencias, Universidad Autónoma de Madrid, Institute for Advanced Research in Chemical Sciences (IAdChem), Red ORFEO-CINQA, Av. Francisco Tomás y Valiente 7, Campus de Cantoblanco, 28049, Madrid, Spain.
| | - M Teresa Quirós
- Department of Organic Chemistry and Inorganic Chemistry, Facultad de Farmacia, Universidad de Alcalá de Henares, Campus Universitario, 28871, Madrid, Spain
| | - Elena Buñuel
- Department of Organic Chemistry, Facultad de Ciencias, Universidad Autónoma de Madrid, Institute for Advanced Research in Chemical Sciences (IAdChem), Red ORFEO-CINQA, Av. Francisco Tomás y Valiente 7, Campus de Cantoblanco, 28049, Madrid, Spain.
| | - Magali Gimeno
- Department of Chemistry, University of Rochester, Rochester, New York 14627, USA
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, UK
| | - William W Brennessel
- Department of Chemistry, University of Rochester, Rochester, New York 14627, USA
| | - Michael L Neidig
- Inorganic Chemistry Laboratory, Department of Chemistry, University of Oxford, South Parks Road, Oxford OX1 3QR, UK
| | - José Luis Priego
- Department of Inorganic Chemistry, Universidad Complutense de Madrid, Ciudad Universitaria, 28040, Madrid, Spain
| | - Diego J Cárdenas
- Department of Organic Chemistry, Facultad de Ciencias, Universidad Autónoma de Madrid, Institute for Advanced Research in Chemical Sciences (IAdChem), Red ORFEO-CINQA, Av. Francisco Tomás y Valiente 7, Campus de Cantoblanco, 28049, Madrid, Spain.
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Balakrishnan V, Murugesan V, Chindan B, Rasappan R. Attenuation of Ni(0) Decomposition: Mechanistic Insights into AgF-Assisted Nickel-Mediated Silylation. Inorg Chem 2022; 61:1438-1446. [PMID: 34995056 DOI: 10.1021/acs.inorgchem.1c03108] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In nickel-mediated Kumada cross-coupling reactions, low valent active nickel complexes are often generated in situ and the ligands usually govern the reactivity or stability of these complexes. However, the decomposition of active nickel complexes is inevitable if the subsequent reaction is sluggish. While we recently developed AgF-assisted nickel catalysis to cross-couple methyl ethers and silylmagnesium reagents, the intriguing catalytic role of AgF and the actual active nickel species remains elusive. Recently, both Ni(0) and Ni(I) intermediate complexes are identified as active species in Kumada cross-coupling reactions. Control experiments in combination with 31P nuclear magnetic resonance (NMR) suggest that AgF attenuates the decomposition of in situ generated Ni(0) species. The plausible Ni(0) and Ni(I) intermediate complexes were synthesized, and experimental findings are consistent with the actual catalytic cycle being Ni(0)/Ni(II) rather than Ni(I)/Ni(III).
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Affiliation(s)
- Venkadesh Balakrishnan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Thiruvananthapuram 695551, Kerala, India
| | - Vetrivelan Murugesan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Thiruvananthapuram 695551, Kerala, India
| | - Bincy Chindan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Thiruvananthapuram 695551, Kerala, India
| | - Ramesh Rasappan
- School of Chemistry, Indian Institute of Science Education and Research Thiruvananthapuram, Vithura, Thiruvananthapuram 695551, Kerala, India
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Posada-Pérez S, Escayola S, Poater J, Solà M, Poater A. Ni(I)-TPA Stabilization by Hydrogen Bond formation on the Second Coordination Sphere: a DFT Characterization. Dalton Trans 2022; 51:12585-12595. [DOI: 10.1039/d2dt01355j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Ni(I) compounds are less common than those of either Ni(0) or Ni(II). Recently, a series of Ni(I) tris(2 pyridylmethyl)amine (TPA) complexes were synthetized through the reduction of Ni(II)-TPA complexes and...
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Zhang C, Hu W, Lovinger GJ, Jin J, Chen J, Morken JP. Enantiomerically Enriched α-Borylzinc Reagents by Nickel-Catalyzed Carbozincation of Vinylboronic Esters. J Am Chem Soc 2021; 143:14189-14195. [PMID: 34425672 DOI: 10.1021/jacs.1c05274] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
In this paper is described a synthesis of enantiomerically enriched, configurationally stable organozinc reagents by catalytic enantioselective carbozincation of a vinylboronic ester. This process furnishes enantiomerically enriched α-borylzinc intermediates that are shown to undergo stereospecific reactions, producing enantioenriched secondary boronic ester products. The properties of the intermediate α-borylzinc reagent are probed and the synthetic utility of the products is demonstrated by application to the synthesis of (-)-aphanorphine and (-)-enterolactone.
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Affiliation(s)
- Chenlong Zhang
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Weipeng Hu
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Gabriel J Lovinger
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Jing Jin
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - Jingjia Chen
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
| | - James P Morken
- Department of Chemistry, Merkert Chemistry Center, Boston College, Chestnut Hill, Massachusetts 02467, United States
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