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Rigid, strained, and flexible: a DFT study of a backbone-affected monohydride formation of salen and salan complexes. Theor Chem Acc 2022. [DOI: 10.1007/s00214-022-02889-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
AbstractThe monohydride formation of some palladium(II)-sulfosalen and sulfosalan catalysts was studied by DFT methods. The coordination of the hydrogen molecule to the metal center and the following heterolytic dissociation of the coordinated hydrogen could occur in a two-step or a concerted process resulting in a monohydride complex and having a protonated dissociated phenolate arm. The effect of the backbone frame of the ligands (the molecular unit between two nitrogen atoms) strongly determines the energetics and the type of the hydride formation. Rigid, strained, and flexible molecular structures were studied covering a wide range of planar and spherical types of backbones. Besides the previously studied Direct 1 and Direct 2 mechanisms, three other mechanisms of direct monohydride formation were found. Known and fictive structures were studied to predict kinetically and thermodynamically preferred pathways as well as complexes for this type of reaction.
Graphical Abstract
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2
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Devonport J, Spencer J, Kostakis GE. Breaking the symmetry: C1-salans with (N-H) backbones. Dalton Trans 2021; 50:12069-12073. [PMID: 34373864 DOI: 10.1039/d1dt01950c] [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
We disclose a synthetic route that providess an unprecedented library of C1 salan ligands endowed with (N-H) backbones, previously limited to N-methylated backbones. Efforts to identify a generic complexation protocol to yield the corresponding Cu(II)-salan complexes demonstrate the scope and limitations of this approach.
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Affiliation(s)
- Jack Devonport
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton, BN1 9QJ, UK.
| | - John Spencer
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton, BN1 9QJ, UK.
| | - George E Kostakis
- Department of Chemistry, School of Life Sciences, University of Sussex, Brighton, BN1 9QJ, UK.
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Valentini F, Ferlin F, Tomarelli E, Mahmoudi H, Bagherzadeh M, Calamante M, Vaccaro L. A Waste-Minimized Approach to Cassar-Heck Reaction Based on POLITAG-Pd 0 Heterogeneous Catalyst and Recoverable Acetonitrile Azeotrope. CHEMSUSCHEM 2021; 14:3359-3366. [PMID: 34240814 PMCID: PMC8457221 DOI: 10.1002/cssc.202101052] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/19/2021] [Revised: 07/01/2021] [Indexed: 05/30/2023]
Abstract
Three different Pd0 -based heterogeneous catalysts were developed and tested in the Cassar-Heck reaction (i. e., copper-free Sonogashira reaction) aiming at the definition of a waste minimized protocol. The cross-linked polymeric supports used in this investigation were designed to be adequate for different reaction media and were decorated with different pincer-type ionic ligands having the role of stabilizing the formation and dimension of palladium nanoparticles. Among the ionic tags tested, bis-imidazolium showed the best performances in terms of efficiency and durability of the metal catalytic system. Eventually, aqueous acetonitrile azeotrope was selected as the reaction medium as it allowed the best catalytic efficiency combined with easy recovery and reuse. Finally, the synergy between the selected catalyst and reaction medium allowed to obtain highly satisfactory isolated yields of a variety of substrates while using a low amount of metal catalyst. The high performance of the designed POLymeric Ionic TAG (POLITAG)-Pd0 , along with its good selectivity achieved in a copper-free process, also led to a simplified purification procedure allowing the minimization of the waste generated as also proven by the very low E-factor values (1.4-5) associated.
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Affiliation(s)
- Federica Valentini
- Dipartimento di Chimica, Biologia e BiotecnologieUniversità degli Studi di PerugiaVia Elce di Sotto, 806124PerugiaItaly
| | - Francesco Ferlin
- Dipartimento di Chimica, Biologia e BiotecnologieUniversità degli Studi di PerugiaVia Elce di Sotto, 806124PerugiaItaly
| | - Elena Tomarelli
- Dipartimento di Chimica, Biologia e BiotecnologieUniversità degli Studi di PerugiaVia Elce di Sotto, 806124PerugiaItaly
| | - Hamed Mahmoudi
- Chemistry DepartmentSharif University of TechnologyTehran P.O Box11155 3615Iran
| | - Mojtaba Bagherzadeh
- Chemistry DepartmentSharif University of TechnologyTehran P.O Box11155 3615Iran
| | - Massimo Calamante
- Institute of Chemistry of Organometallic Compounds (CNR-ICCOM)Via Madonna del Piano 1050019Sesto FiorentinoItaly
- Department of Chemistry“U. Schiff”University of FlorenceVia della Lastruccia 1350019Sesto FiorentinoItaly
| | - Luigi Vaccaro
- Dipartimento di Chimica, Biologia e BiotecnologieUniversità degli Studi di PerugiaVia Elce di Sotto, 806124PerugiaItaly
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Bunda S, May NV, Bonczidai-Kelemen D, Udvardy A, Ching HYV, Nys K, Samanipour M, Van Doorslaer S, Joó F, Lihi N. Copper(II) Complexes of Sulfonated Salan Ligands: Thermodynamic and Spectroscopic Features and Applications for Catalysis of the Henry Reaction. Inorg Chem 2021; 60:11259-11272. [PMID: 34251196 DOI: 10.1021/acs.inorgchem.1c01264] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Copper(II) complexes formed with sulfonated salan ligands (HSS) have been synthesized, and their coordination chemistry has been characterized using pH-potentiometry and spectroscopic methods [UV-vis, electron paramagnetic resonance (EPR), and electron-electron double resonance (ELDOR)-detected NMR (EDNMR)] in aqueous solution. Several bridging moieties between the two salicylamine functions were introduced, e.g., ethyl (HSS), propyl (PrHSS), butyl (BuHSS), cyclohexyl (cis-CyHSS, trans-CyHSS), and diphenyl (dPhHSS). All of the investigated ligands feature excellent copper(II) binding ability via the formation of a (O-,N,N,O-) chelate system. The results indicated that the cyclohexyl moiety significantly enhances the stability of the copper(II) complexes. EPR studies revealed that the arrangement of the coordinated donor atoms is more symmetrical around the copper(II) center and similar for HSS, BuHSS, CyHSS, and dPhHSS, respectively, and a higher rhombicity of the g tensor was detected for PrHSS. The copper(II) complexes of the sulfosalan ligands were isolated in solid form also and showed moderate catalytic activity in the Henry (nitroaldol) reaction of aldehydes and nitromethane. The best yield for nitroaldol production was obtained for copper(II) complexes of PrHSS and BuHSS, although their metal binding ability is moderate compared to that of the cyclohexyl counterparts. However, these complexes possess larger spin density on the nitrogen nuclei than that for the other cases, which alters their catalytic activity.
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Affiliation(s)
- Szilvia Bunda
- Department of Physical Chemistry, University of Debrecen, Debrecen H-4032, Hungary.,Doctoral School of Chemistry, University of Debrecen, Debrecen H-4032, Hungary
| | - Nóra V May
- Centre for Structural Science, Research Centre for Natural Sciences, Budapest H-1519, Hungary
| | - Dóra Bonczidai-Kelemen
- Doctoral School of Chemistry, University of Debrecen, Debrecen H-4032, Hungary.,Department of Inorganic and Analytical Chemistry, University of Debrecen, Debrecen H-4032, Hungary
| | - Antal Udvardy
- Department of Physical Chemistry, University of Debrecen, Debrecen H-4032, Hungary
| | - H Y Vincent Ching
- Department of Chemistry, University of Antwerp, Universiteitsplein 1, Antwerpen B-2610, Belgium
| | - Kevin Nys
- Department of Chemistry, University of Antwerp, Universiteitsplein 1, Antwerpen B-2610, Belgium
| | - Mohammad Samanipour
- Department of Chemistry, University of Antwerp, Universiteitsplein 1, Antwerpen B-2610, Belgium
| | - Sabine Van Doorslaer
- Department of Chemistry, University of Antwerp, Universiteitsplein 1, Antwerpen B-2610, Belgium
| | - Ferenc Joó
- Department of Physical Chemistry, University of Debrecen, Debrecen H-4032, Hungary.,MTA-DE Redox and Homogeneous Reaction Mechanisms Research Group, University of Debrecen, Debrecen H-4032, Hungary
| | - Norbert Lihi
- Department of Inorganic and Analytical Chemistry, University of Debrecen, Debrecen H-4032, Hungary.,MTA-DE Redox and Homogeneous Reaction Mechanisms Research Group, University of Debrecen, Debrecen H-4032, Hungary
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Purgel M, Fehér PP, Balogh ÁK, Bunda S, Joó F. Water-mediated formation of hydride derivates from flexible Pd-salan complexes: A DFT study. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2020.111331] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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6
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Homogeneous catalytic hydrogenation of lipids in aqueous dispersions and bacterial cell membranes with an efficient water-soluble Pd(II)-sulfosalan catalyst, Na2[Pd(HSS)]. CATAL COMMUN 2020. [DOI: 10.1016/j.catcom.2020.106153] [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] Open
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Bunda S, Voronova K, Kathó Á, Udvardy A, Joó F. Palladium (II)-Salan Complexes as Catalysts for Suzuki-Miyaura C-C Cross-Coupling in Water and Air. Effect of the Various Bridging Units within the Diamine Moieties on the Catalytic Performance. Molecules 2020; 25:molecules25173993. [PMID: 32887249 PMCID: PMC7504744 DOI: 10.3390/molecules25173993] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2020] [Revised: 08/28/2020] [Accepted: 08/31/2020] [Indexed: 11/16/2022] Open
Abstract
Water-soluble salan ligands were synthesized by hydrogenation and subsequent sulfonation of salens (N,N'-bis(slicylidene)ethylenediamine and analogues) with various bridging units (linkers) connecting the nitrogen atoms. Pd (II) complexes were obtained in reactions of sulfosalans and [PdCl4]2-. Characterization of the ligands and complexes included extensive X-ray diffraction studies, too. The Pd (II) complexes proved highly active catalysts of the Suzuki-Miyaura reaction of aryl halides and arylboronic acid derivatives at 80 °C in water and air. A comparative study of the Pd (II)-sulfosalan catalysts showed that the catalytic activity largely increased with increasing linker length and with increasing steric congestion around the N donor atoms of the ligands; the highest specific activity was 40,000 (mol substrate) (mol catalyst × h)-1. The substrate scope was explored with the use of the two most active catalysts, containing 1,4-butylene and 1,2-diphenylethylene linkers, respectively.
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Affiliation(s)
- Szilvia Bunda
- Department of Physical Chemistry, University of Debrecen, P.O. Box 400, H-4002 Debrecen, Hungary; (S.B.); (Á.K.)
- Doctoral School of Chemistry, University of Debrecen, P.O. Box 400, H-4002 Debrecen, Hungary
| | - Krisztina Voronova
- Department of Chemistry, University of Nevada, Reno, Reno, NV 89557, USA;
| | - Ágnes Kathó
- Department of Physical Chemistry, University of Debrecen, P.O. Box 400, H-4002 Debrecen, Hungary; (S.B.); (Á.K.)
| | - Antal Udvardy
- Department of Physical Chemistry, University of Debrecen, P.O. Box 400, H-4002 Debrecen, Hungary; (S.B.); (Á.K.)
- Correspondence: (A.U.); (F.J.)
| | - Ferenc Joó
- Department of Physical Chemistry, University of Debrecen, P.O. Box 400, H-4002 Debrecen, Hungary; (S.B.); (Á.K.)
- MTA-DE Redox and Homogeneous Catalytic Reaction Mechanisms Research Group, P.O. Box 400, H-4002 Debrecen, Hungary
- Correspondence: (A.U.); (F.J.)
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Coordination chemistry and catalytic applications of Pd(II)–, and Ni(II)–sulfosalan complexes in aqueous media. J Inorg Biochem 2020; 203:110945. [DOI: 10.1016/j.jinorgbio.2019.110945] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2019] [Revised: 11/18/2019] [Accepted: 11/20/2019] [Indexed: 11/22/2022]
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Bunda S, Udvardy A, Voronova K, Joó F. Organic Solvent-Free, Pd(II)-Salan Complex-Catalyzed Synthesis of Biaryls via Suzuki–Miyaura Cross-Coupling in Water and Air. J Org Chem 2018; 83:15486-15492. [DOI: 10.1021/acs.joc.8b02340] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Szilvia Bunda
- Department of Physical Chemistry, University of Debrecen, P.O. Box 400, Debrecen H-4002, Hungary
| | - Antal Udvardy
- Department of Physical Chemistry, University of Debrecen, P.O. Box 400, Debrecen H-4002, Hungary
| | - Krisztina Voronova
- Department of Physical Chemistry, University of Debrecen, P.O. Box 400, Debrecen H-4002, Hungary
| | - Ferenc Joó
- Department of Physical Chemistry, University of Debrecen, P.O. Box 400, Debrecen H-4002, Hungary
- MTA-DE Redox and Homogeneous Catalytic Reaction Mechanisms Research Group, University of Debrecen, P.O. Box 400, Debrecen H-4002, Hungary
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Gombos R, Nagyházi B, Joó F. Hydrogenation of α,β-unsaturated aldehydes in aqueous media with a water-soluble Pd(II)-sulfosalan complex catalyst. REACTION KINETICS MECHANISMS AND CATALYSIS 2018. [DOI: 10.1007/s11144-018-1488-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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11
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Quantitative Construction of C≡C Bond: Renaissance of Reductive Coupling of Benzotribromides Promoted by Cu/Polyamine. ChemistrySelect 2018. [DOI: 10.1002/slct.201702778] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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12
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Udvardy A, Serrano-Ruiz M, Passarelli V, Bolyog-Nagy E, Joó F, Kathó Á, Romerosa A. Synthesis and catalytic activity of new, water-soluble mono- and dinuclear ruthenium(II) complexes containing 1,3,5-triaza-7-phosphaadamantane: Study of the effect of the visible light. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2017.04.054] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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13
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An ambient temperature Sonogashira cross-coupling protocol using 4-aminobenzoic acid as promoter under copper and amine free conditions. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.04.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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14
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Marozsán N, Horváth H, Erdei A, Joó F. Dehalogenation of organic halides in aqueous media by hydrogen transfer from formate catalyzed by water-soluble Ru(II)-N-heterocyclic carbene complexes. ACTA ACUST UNITED AC 2016. [DOI: 10.1016/j.molcata.2016.09.036] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Pradhan S, Dutta S, John RP. A coordination driven self-assembled Pd6L8 nanoball catalyses copper and phosphine-free Sonogashira coupling reaction in both homogeneous and heterogeneous formats. NEW J CHEM 2016. [DOI: 10.1039/c5nj03658e] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
A self-assembled Pd6L8 nanocage catalysed copper free Sonogashira reaction under mild and aerobic conditions, at 100 ppm catalyst loading in aqueous medium in the homogeneous phase, and at 500 ppm in the heterogeneous phase.
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Affiliation(s)
- Subhashis Pradhan
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad-826004
- India
| | - Subhadip Dutta
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad-826004
- India
| | - Rohith P. John
- Department of Applied Chemistry
- Indian School of Mines
- Dhanbad-826004
- India
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