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Gonzálvez MA, Williams CM, Martínez M, Bernhardt PV. Kinetico-Mechanistic Studies on a Reactive Organocopper(II) Complex: Cu-C Bond Homolysis versus Heterolysis. Inorg Chem 2023; 62:4662-4671. [PMID: 36877141 DOI: 10.1021/acs.inorgchem.3c00127] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/07/2023]
Abstract
Organocopper(II) reagents are an unexplored frontier of copper catalysis. Despite being proposed as reactive intermediates, an understanding of the stability and reactivity of the CuII-C bond has remained elusive. Two main pathways can be considered for the cleavage mode of a CuII-C bond: homolysis and heterolysis. We recently showed how organocopper(II) reagents can react with alkenes via radical addition, a homolytic pathway. In this work, the decomposition of the complex [CuIILR]+ [L = tris(2- dimethylaminoethyl)amine, Me6tren, R = NCCH2-] in the absence and presence of an initiator (RX, X = Cl, Br) was evaluated. When no initiator was present, first-order CuII-C bond homolysis occurred producing [CuIL]+ and succinonitrile, via radical termination. When an excess of the initiator was present, a subsequent formation of [CuIILX]+ via a second-order reaction was found, which results from the reaction of [CuIL]+ with RX following homolysis. However, when Brønsted acids (R'-OH: R' = H, Me, Ph, PhCO) were present, heterolytic cleavage of the CuII-C bond produced [CuIIL(OR')]+ and MeCN. Kinetic studies were undertaken to obtain the thermal (ΔH⧧, ΔS⧧) and pressure (ΔV⧧) activation parameters and deuterium kinetic isotopic effects, which provided an understanding of the strength of the CuII-C bond and the nature of the transition state for the reactions involved. These results reveal possible reaction pathways for organocopper(II) complexes relevant to their applications as catalysts in C-C bond forming reactions.
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Affiliation(s)
- Miguel A Gonzálvez
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia
| | - Craig M Williams
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia
| | - Manuel Martínez
- Departament de Química Inorgànica i Orgànica, Secció de Química Inorgànica, Universitat de Barcelona, Martí i Franquès 1-11, Barcelona 08028, Spain.,Institute of Nanoscience and Nanotechnology (IN2UB), Universitat de Barcelona, Barcelona 08028, Spain
| | - Paul V Bernhardt
- School of Chemistry and Molecular Biosciences, University of Queensland, Brisbane 4072, Australia
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Crespi AF, Sánchez VM, Vega D, Pérez AL, Brondino CD, Linck YG, Hodgkinson P, Rodríguez-Castellón E, Lázaro-Martínez JM. Paramagnetic solid-state NMR assignment and novel chemical conversion of the aldehyde group to dihydrogen ortho ester and hemiacetal moieties in copper(ii)- and cobalt(ii)-pyridinecarboxaldehyde complexes. RSC Adv 2021; 11:20216-20231. [PMID: 35479880 PMCID: PMC9033980 DOI: 10.1039/d1ra02512k] [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: 03/30/2021] [Accepted: 06/01/2021] [Indexed: 12/16/2022] Open
Abstract
The complex chemical functionalization of aldehyde moieties in Cu(ii)- and Co(ii)-pyridinecarboxaldehyde complexes was studied. X-ray studies demonstrated that the aldehyde group (RCHO) of the four pyridine molecules is converted to dihydrogen ortho ester (RC(OCH3)(OH)2) and hemiacetal (RCH(OH)(OCH3)) moieties in both 4-pyridinecarboxaldehyde copper and cobalt complexes. In contrast, the aldehyde group is retained when the 3-pyridinecarboxaldehyde ligand is complexed with cobalt. In the different copper complexes, similar paramagnetic 1H resonance lines were obtained in the solid state; however, the connectivity with the carbon structure and the 1H vicinities were done with 2D 1H–13C HETCOR, 1H–1H SQ/DQ and proton spin diffusion (PSD) experiments. The strong paramagnetic effect exerted by the cobalt center prevented the observation of 13C NMR signals and chemical information could only be obtained from X-ray experiments. 2D PSD experiments in the solid state were useful for the proton assignments in both Cu(ii) complexes. The combination of X-ray crystallography experiments with DFT calculations together with the experimental results obtained from EPR and solid-state NMR allowed the assignment of NMR signals in pyridinecarboxaldehyde ligands coordinated with copper ions. In cases where the crystallographic information was not available, as in the case of the 3-pyridinecarboxaldehyde Cu(ii) complex, the combination of these techniques allowed not only the assignment of NMR signals but also the study of the functionalization of the substituent group. The complex chemical functionalization of the aldehyde group was elucidated in copper and cobalt complexes for 4- and 3-pyridinecarboxaldehyde ligands.![]()
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Affiliation(s)
- Ayelén F Crespi
- Universidad de Buenos Aires - CONICET, Facultad de Farmacia y Bioquímica, Instituto de Química y Metabolismo del Fármaco (IQUIMEFA) Ciudad Autónoma de Buenos Aires Argentina
| | - Verónica M Sánchez
- Centro de Simulación Computacional para Aplicaciones Tecnológicas, CSC-CONICET Ciudad Autónoma de Buenos Aires Argentina.,Universidad Nacional de General San Martín San Martín Buenos Aires Argentina
| | - Daniel Vega
- Universidad Nacional de General San Martín San Martín Buenos Aires Argentina.,Comisión Nacional de Energía Atómica San Martín Buenos Aires Argentina
| | - Ana L Pérez
- Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral - CONICET, Ciudad Universitaria Santa Fe Argentina
| | - Carlos D Brondino
- Facultad de Bioquímica y Ciencias Biológicas, Universidad Nacional del Litoral - CONICET, Ciudad Universitaria Santa Fe Argentina
| | | | | | | | - Juan M Lázaro-Martínez
- Universidad de Buenos Aires - CONICET, Facultad de Farmacia y Bioquímica, Instituto de Química y Metabolismo del Fármaco (IQUIMEFA) Ciudad Autónoma de Buenos Aires Argentina
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Kitanosono T, Zhu L, Liu C, Xu P, Kobayashi S. An Insoluble Copper(II) Acetylacetonate–Chiral Bipyridine Complex that Catalyzes Asymmetric Silyl Conjugate Addition in Water. J Am Chem Soc 2015; 137:15422-5. [DOI: 10.1021/jacs.5b11418] [Citation(s) in RCA: 67] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Taku Kitanosono
- Department of Chemistry,
School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Lei Zhu
- Department of Chemistry,
School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Chang Liu
- Department of Chemistry,
School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Pengyu Xu
- Department of Chemistry,
School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
| | - Shu̅ Kobayashi
- Department of Chemistry,
School of Science, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Gromov OI, Terekhin AV, Lobanov AV, Golubeva EN. Photochemical transformations of quaternary ammonium tetrachlorocuprates on an aerosil surface. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY B 2014. [DOI: 10.1134/s1990793113060031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Golubeva EN, Zubanova EM, Melnikov MY, Gostev FE, Shelaev IV, Nadtochenko VA. Femtosecond spectroscopy and TD-DFT calculations of CuCl42− excited states. Dalton Trans 2014; 43:17820-7. [DOI: 10.1039/c4dt01409j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Photoinduced processes of tetrahexylammonium tetrachlorocuprate [(C6H13)4N]2CuIICl4 in chloro-organic solvents were investigated by steady state photolysis and femtosecond transient absorption spectroscopy, as well as TD-DFT calculations of excited terms.
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Affiliation(s)
| | | | | | | | | | - Victor A. Nadtochenko
- Moscow, Russia
- Moscow, Russia
- Moscow Institute of Physics and Technology State University 9 Institutskiy per
- , Russian Federation
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6
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Gromov OI, Golubeva EN, Zhidomirov GM, Mel’nikov MY. Compounds with the copper(II)-carbon bond: EPR spectroscopy and quantum chemistry. DOKLADY PHYSICAL CHEMISTRY 2013. [DOI: 10.1134/s0012501613050011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Golubeva EN, Zubanova EM, Zhidomirov GM. The nature of Cu-C bond and copper oxidation state in chloroorganocuprates [CuClnCH3]2−n. J PHYS ORG CHEM 2013. [DOI: 10.1002/poc.3093] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Elena N. Golubeva
- Chemistry Department; Lomonosov Moscow State University; Leninskie Gory 1-3; Moscow; Russia
| | - Ekaterina M. Zubanova
- Chemistry Department; Lomonosov Moscow State University; Leninskie Gory 1-3; Moscow; Russia
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Gromov OI, Zubanova EM, Golubeva EN, Plyusnin VF, Zhidomirov GM, Melnikov MY. UV–Vis Identification and DFT-Assisted Prediction of Structures of Cu(II)–Alkyl Chlorocomplexes. J Phys Chem A 2012; 116:11581-5. [DOI: 10.1021/jp309222y] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Oleg I. Gromov
- Chemistry Department, Lomonosov Moscow State University, Leninskiye Gory
1-3, Moscow, Russia
| | - Ekaterina M. Zubanova
- Chemistry Department, Lomonosov Moscow State University, Leninskiye Gory
1-3, Moscow, Russia
| | - Elena N. Golubeva
- Chemistry Department, Lomonosov Moscow State University, Leninskiye Gory
1-3, Moscow, Russia
| | - Victor F. Plyusnin
- Insitute of Chemical Kinetics and Combustion SB RAS, 630090 Novosibirsk,
Russia
- Novosibirsk State University, 630090 Novosibirsk, Russia
| | - Georgii M. Zhidomirov
- Chemistry Department, Lomonosov Moscow State University, Leninskiye Gory
1-3, Moscow, Russia
- Boreskov Institute of Catalysis (BIC) SB RAS, 630090 Novosibirsk, Russia
| | - Mikhail Y. Melnikov
- Chemistry Department, Lomonosov Moscow State University, Leninskiye Gory
1-3, Moscow, Russia
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Zubanova EM, Golubeva EN, Zhidomirov GM. Metastability of copper(II) organic compounds: Molecular dynamics simulation. DOKLADY PHYSICAL CHEMISTRY 2012. [DOI: 10.1134/s0012501612090023] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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