1
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Bartalucci N, Marchetti F, Zacchini S, Pampaloni G. Decarbonylation of phenylacetic acids by high valent transition metal halides. Dalton Trans 2019; 48:5725-5734. [DOI: 10.1039/c9dt00551j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The unusual decarbonylation of α-phenyl carboxylic acids with suitable substituents is a general reaction promoted at room temperature by homoleptic halides of high valent transition metals.
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Affiliation(s)
- Niccolò Bartalucci
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- I-56124 Pisa
- Italy
| | - Fabio Marchetti
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- I-56124 Pisa
- Italy
| | - Stefano Zacchini
- Dipartimento di Chimica Industriale “Toso Montanari”
- Università di Bologna
- I-40136 Bologna
- Italy
| | - Guido Pampaloni
- Dipartimento di Chimica e Chimica Industriale
- Università di Pisa
- I-56124 Pisa
- Italy
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2
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Bartalucci N, Belpassi L, Marchetti F, Pampaloni G, Zacchini S, Ciancaleoni G. Ubiquity of cis-Halide → Isocyanide Direct Interligand Interaction in Organometallic Complexes. Inorg Chem 2018; 57:14554-14563. [PMID: 30430836 DOI: 10.1021/acs.inorgchem.8b02088] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
We recently reported a density functional theory (DFT) analysis of the Nb(V)-C bond in various NbCl5(L) complexes, discovering that the carbon ligand L receives electronic density from the metal (classical back-donation) and from the chlorides in the cis position (direct interligand interaction). Here we report the synthesis and the structural characterization of two new coordination compounds of niobium pentahalides, i.e., NbX5(CNXyl) (X = Cl, Br; Xyl = 2,6-C6H3Me2), and the corresponding DFT analyses of the Nb(V)-C bond using the Natural Orbitals for Chemical Valence-Charge Displacement (NOCV-CD) approach, confirming the presence of a cis-halide → isocyanide direct interligand interaction. To verify whether the latter is limited to Nb complexes or not, we performed a NOCV-CD analysis on a series of several organometallic complexes based on Ti(IV), Nb(V), Ta(V), Rh(III), Pd(II), and Au(III), all of which bear one halide ligand and m-xylyl-isocyanide in a mutual cis position, revealing that the cis-halide → isocyanide interaction is always present.
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Affiliation(s)
- Niccolò Bartalucci
- Dipartimento di Chimica e Chimica Industriale , Università di Pisa , Via Giuseppe Moruzzi 13 , Pisa 56124 , Italy
| | - Leonardo Belpassi
- Istituto di Scienze e Tecnologie Molecolari del CNR (CNR-ISTM), c/o Dipartimento di Chimica, Biologia e Biotecnologie, Università degli Studi di Perugia , via Elce di Sotto 8 , Perugia I-06123 , Italy
| | - Fabio Marchetti
- Dipartimento di Chimica e Chimica Industriale , Università di Pisa , Via Giuseppe Moruzzi 13 , Pisa 56124 , Italy
| | - Guido Pampaloni
- Dipartimento di Chimica e Chimica Industriale , Università di Pisa , Via Giuseppe Moruzzi 13 , Pisa 56124 , Italy
| | - Stefano Zacchini
- Dipartimento di Chimica Industriale "Toso Montanari" , Università di Bologna , Viale Risorgimento 4 , I-40136 Bologna , Italy
| | - Gianluca Ciancaleoni
- Dipartimento di Chimica e Chimica Industriale , Università di Pisa , Via Giuseppe Moruzzi 13 , Pisa 56124 , Italy
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3
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Synthesis of new coordination complexes of MF5 (M = Nb, Ta), and insights into the Ta(V) reduction. Inorganica Chim Acta 2018. [DOI: 10.1016/j.ica.2018.06.040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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4
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Bartalucci N, Biancalana L, Bortoluzzi M, Pampaloni G, Giordano L, Zacchini S, Marchetti F. Cascade Reactions of α-Phenylcinnamic Acid to Polycyclic Compounds Promoted by High Valent Transition Metal Halides. ChemistrySelect 2018. [DOI: 10.1002/slct.201801865] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Niccolò Bartalucci
- Università di Pisa; Dipartimento di Chimica e Chimica Industriale, Via Moruzzi 13; I-56124 Pisa
- CIRCC; via Celso Ulpiani 27; I-70126 Bari Italy
| | - Lorenzo Biancalana
- Università di Pisa; Dipartimento di Chimica e Chimica Industriale, Via Moruzzi 13; I-56124 Pisa
- CIRCC; via Celso Ulpiani 27; I-70126 Bari Italy
| | - Marco Bortoluzzi
- CIRCC; via Celso Ulpiani 27; I-70126 Bari Italy
- Università Ca' Foscari Venezia; Dipartimento di Scienze Molecolari e Nanosistemi, Via Torino 155; I-30170 Mestre (VE) Italy
| | - Guido Pampaloni
- Università di Pisa; Dipartimento di Chimica e Chimica Industriale, Via Moruzzi 13; I-56124 Pisa
- CIRCC; via Celso Ulpiani 27; I-70126 Bari Italy
| | - Luca Giordano
- Università di Pisa; Dipartimento di Chimica e Chimica Industriale, Via Moruzzi 13; I-56124 Pisa
| | - Stefano Zacchini
- CIRCC; via Celso Ulpiani 27; I-70126 Bari Italy
- Università di Bologna; Dipartimento di Chimica Industriale “Toso Montanari”, Viale Risorgimento 4; I-40136 Bologna Italy
| | - Fabio Marchetti
- Università di Pisa; Dipartimento di Chimica e Chimica Industriale, Via Moruzzi 13; I-56124 Pisa
- CIRCC; via Celso Ulpiani 27; I-70126 Bari Italy
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5
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Bartalucci N, Bortoluzzi M, Pampaloni G, Pinzino C, Zacchini S, Marchetti F. Stable coordination complexes of α-diimines with Nb(v) and Ta(v) halides. Dalton Trans 2018; 47:3346-3355. [DOI: 10.1039/c8dt00122g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Uncommon coordination compounds of high valent transition metal halides with N-aryl α-diimines have been obtained, without the need for reducing agents to quench the activation power of the metal centre.
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Affiliation(s)
- Niccolò Bartalucci
- Università di Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
- CIRCC
| | - Marco Bortoluzzi
- CIRCC
- I-70126 Bari
- Italy
- Università Ca’ Foscari Venezia
- Dipartimento di Scienze Molecolari e Nanosistemi
| | - Guido Pampaloni
- Università di Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
- CIRCC
| | | | - Stefano Zacchini
- CIRCC
- I-70126 Bari
- Italy
- Università di Bologna
- Dipartimento di Chimica Industriale “Toso Montanari”
| | - Fabio Marchetti
- Università di Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56124 Pisa
- Italy
- CIRCC
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6
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Lada ZG, Sanakis Y, Raptopoulou CP, Psycharis V, Perlepes SP, Mitrikas G. Probing the electronic structure of a copper(ii) complex by CW- and pulse-EPR spectroscopy. Dalton Trans 2017. [DOI: 10.1039/c7dt01785e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The electronic structure of a mononuclear octahedral copper(ii) complex has been studied using CW EPR spectroscopy and other advanced methods including Davies ENDOR and HYSCORE (1H and 13C) spectroscopy.
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Affiliation(s)
- Zoi G. Lada
- Foundation for Research and Technology-Hellas (FORTH)
- Institute of Chemical Engineering Sciences (ICE-HT)
- 26504 Patras
- Greece
- Department of Chemistry
| | - Yiannis Sanakis
- Institute of Nanoscience and Nanotechnology
- NCSR “Demokritos”
- 153 10 Aghia Paraskevi Attikis
- Greece
| | - Catherine P. Raptopoulou
- Institute of Nanoscience and Nanotechnology
- NCSR “Demokritos”
- 153 10 Aghia Paraskevi Attikis
- Greece
| | - Vassilis Psycharis
- Institute of Nanoscience and Nanotechnology
- NCSR “Demokritos”
- 153 10 Aghia Paraskevi Attikis
- Greece
| | - Spyros P. Perlepes
- Foundation for Research and Technology-Hellas (FORTH)
- Institute of Chemical Engineering Sciences (ICE-HT)
- 26504 Patras
- Greece
- Department of Chemistry
| | - George Mitrikas
- Institute of Nanoscience and Nanotechnology
- NCSR “Demokritos”
- 153 10 Aghia Paraskevi Attikis
- Greece
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7
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Marchetti F, Pampaloni G, Zacchini S. The reactivity of niobium and tantalum pentahalides with imines. Polyhedron 2016. [DOI: 10.1016/j.poly.2016.04.034] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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8
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Rahman MM, Smith MD, Peryshkov DV. Formation of a Cationic Vinylimido Group upon C-H Activation of Nitriles by Trialkylamines in the Presence of TaCl5. Inorg Chem 2016; 55:5101-3. [PMID: 27172115 DOI: 10.1021/acs.inorgchem.6b00677] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
We report a new CH3CN activation mode where an imido group is directly formed by deprotonation of the nitrile coordinated to the highly Lewis acidic Ta(V) center. The unexpected deprotonation of TaCl5(CH3CN) by NEt3 resulted in isolation of the triethylammonium vinylimido complex [HNEt3][Ta(NC(CH2)NEt3)Cl5]. The reaction is proposed to proceed through rearrangement of the initial nucleophilic carbanion to the electrophilic azaallene/carbocation intermediate. The use of more sterically hindered (i-Pr)CN and weakly nucleophilic N(i-Pr)2Et resulted in the isolation of a vinylimido group formed upon dimerization of deprotonated nitriles, suggesting deprotonation as the first step of the transformation.
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Affiliation(s)
- Md Mamdudur Rahman
- Department of Chemistry and Biochemistry, University of South Carolina , 631 Sumter Street, Columbia, South Carolina 29208, United States
| | - Mark D Smith
- Department of Chemistry and Biochemistry, University of South Carolina , 631 Sumter Street, Columbia, South Carolina 29208, United States
| | - Dmitry V Peryshkov
- Department of Chemistry and Biochemistry, University of South Carolina , 631 Sumter Street, Columbia, South Carolina 29208, United States
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9
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Kitos AA, Efthymiou CG, Manos MJ, Tasiopoulos AJ, Nastopoulos V, Escuer A, Perlepes SP. Interesting copper(ii)-assisted transformations of 2-acetylpyridine and 2-benzoylpyridine. Dalton Trans 2016; 45:1063-77. [DOI: 10.1039/c5dt03912f] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Novel CuII-assisted transformations have been observed in the reactions of copper(ii) sources and 2-pyridyl ketones.
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Affiliation(s)
| | | | - Manolis J. Manos
- Department of Chemistry
- University of Cyprus
- 1678 Nicosia
- Cyprus
- Department of Chemistry
| | | | | | - Albert Escuer
- Departament de Quimica Inorganica and Institute of Nanoscience and Nanotechnology (IN2UB)
- Universitat de Barcelona
- 08028 Barcelona
- Spain
| | - Spyros P. Perlepes
- Department of Chemistry
- University of Patras
- 26504 Patras
- Greece
- Institute of Chemical Engineering Sciences
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10
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Damon PL, Liss CJ, Lewis RA, Morochnik S, Szpunar DE, Telser J, Hayton TW. Quantifying the Electron Donor and Acceptor Abilities of the Ketimide Ligands in M(N═C(t)Bu2)4 (M = V, Nb, Ta). Inorg Chem 2015; 54:10081-95. [PMID: 26419513 PMCID: PMC4659433 DOI: 10.1021/acs.inorgchem.5b02017] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Addition of 4 equiv of Li(N═C(t)Bu2) to VCl3 in THF, followed by addition of 0.5 equiv of I2, generates the homoleptic V(IV) ketimide complex, V(N═C(t)Bu2)4 (1), in 42% yield. Similarly, reaction of 4 equiv of Li(N═C(t)Bu2) with NbCl4(THF)2 in THF affords the homoleptic Nb(IV) ketimide complex, Nb(N═C(t)Bu2)4 (2), in 55% yield. Seeking to extend the series to the tantalum congener, a new Ta(IV) starting material, TaCl4(TMEDA) (3), was prepared via reduction of TaCl5 with Et3SiH, followed by addition of TMEDA. Reaction of 3 with 4 equiv of Li(N═C(t)Bu2) in THF results in the isolation of a Ta(V) ketimide complex, Ta(Cl)(N═C(t)Bu2)4 (5), which can be isolated in 32% yield. Reaction of 5 with Tl(OTf) yields Ta(OTf)(N═C(t)Bu2)4 (6) in 44% yield. Subsequent reduction of 6 with Cp*2Co in toluene generates the homoleptic Ta(IV) congener Ta(N═C(t)Bu2)4 (7), although the yields are poor. All three homoleptic group 5 ketimide complexes exhibit squashed tetrahedral geometries in the solid state, as determined by X-ray crystallography. This geometry leads to a d(x(2)-y(2))(1) ((2)B1 in D(2d)) ground state, as supported by DFT calculations. EPR spectroscopic analysis of 1 and 2, performed at X- and Q-band frequencies (∼9 and 35 GHz, respectively), further supports the (2)B1 ground-state assignment, whereas comparison of 1, 2, and 7 with related group 5 tetra(aryl), tetra(amido), and tetra(alkoxo) complexes shows a higher M-L covalency in the ketimide-metal interaction. In addition, a ligand field analysis of 1 and 2 demonstrates that the ketimide ligand is both a strong π-donor and strong π-acceptor, an unusual combination found in very few organometallic ligands.
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Affiliation(s)
- Peter L. Damon
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Cameron J. Liss
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, 430 S. Michigan Ave. Chicago, Illinois 60605-1394 United States
| | - Richard A. Lewis
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - Simona Morochnik
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
| | - David E. Szpunar
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, 430 S. Michigan Ave. Chicago, Illinois 60605-1394 United States
| | - Joshua Telser
- Department of Biological, Chemical and Physical Sciences, Roosevelt University, 430 S. Michigan Ave. Chicago, Illinois 60605-1394 United States
| | - Trevor W. Hayton
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, California 93106, United States
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11
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Satoh Y, Obora Y. Niobium Complexes in Organic Transformations: From Stoichiometric Reactions to Catalytic [2+2+2] Cycloaddition Reactions. European J Org Chem 2015. [DOI: 10.1002/ejoc.201500358] [Citation(s) in RCA: 68] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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12
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Marchetti F, Pampaloni G, Zacchini S. A simple route to thermally-stable salts of pyrrolidinium-2-carbonylchloride. RSC Adv 2014. [DOI: 10.1039/c4ra12630k] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023] Open
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13
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Hayatifar M, Marchetti F, Pampaloni G, Zacchini S. Reactions of TaF5 with activated arenes. Synthesis of [4-(OH)-3-(OCH3)C6H3CH(OH)][4-(OH)-3-(OCH3)C6H3CHO][TaF6], a rare example of protonated aldehyde. Polyhedron 2014. [DOI: 10.1016/j.poly.2013.12.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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14
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Bortoluzzi M, Ferretti E, Marchetti F, Pampaloni G, Zacchini S. A structurally-characterized NbCl5–NHC adduct. Chem Commun (Camb) 2014; 50:4472-4. [DOI: 10.1039/c4cc01575d] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The X-ray structure of 2a is the first one reported for a monodentate NHC–niobium compound and bears the highest oxidation state ever found for a metal centre in a transition metal halide–NHC adduct.
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Affiliation(s)
- Marco Bortoluzzi
- Ca' Foscari University of Venice
- Dipartimento di Scienze Molecolari e Nanosistemi
- I-30123 Venezia, Italy
| | - Eleonora Ferretti
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56126 Pisa, Italy
| | - Fabio Marchetti
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56126 Pisa, Italy
| | - Guido Pampaloni
- University of Pisa
- Dipartimento di Chimica e Chimica Industriale
- I-56126 Pisa, Italy
| | - Stefano Zacchini
- University of Bologna
- Dipartimento di Chimica Industriale “Toso Montanari”
- I-40136 Bologna, Italy
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15
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16
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Marchetti F, Pampaloni G, Zacchini S. The interaction of molybdenum pentachloride with carbonyl compounds. Dalton Trans 2013. [DOI: 10.1039/c2dt32456c] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Gupta AK, Dhir A, Pradeep CP. A fluorescence ‘turn-on’ chemodosimeter for selective detection of Nb5+ ions in mixed aqueous media. Dalton Trans 2013; 42:12819-23. [DOI: 10.1039/c3dt50914a] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Dolci S, Marchetti F, Pampaloni G, Zacchini S. A crystallographic and spectroscopic study on the reactions of WCl6 with carbonyl compounds. Dalton Trans 2013; 42:5635-48. [DOI: 10.1039/c2dt32771f] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Marchetti F, Pampaloni G. Interaction of niobium and tantalum pentahalides with O-donors: coordination chemistry and activation reactions. Chem Commun (Camb) 2012; 48:635-53. [DOI: 10.1039/c1cc14592d] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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20
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Kitos AA, Efthymiou CG, Papatriantafyllopoulou C, Nastopoulos V, Tasiopoulos AJ, Manos MJ, Wernsdorfer W, Christou G, Perlepes SP. The search for cobalt single-molecule magnets: A disk-like CoIIICoII6 cluster with a ligand derived from a novel transformation of 2-acetylpyridine. Polyhedron 2011. [DOI: 10.1016/j.poly.2011.02.013] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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21
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Marchetti F, Pampaloni G. The reactivity of NbX5 (X=F, Cl) with lactons, lactams, and the synthesis of the first nucleobase-containing niobium complex. Inorganica Chim Acta 2011. [DOI: 10.1016/j.ica.2011.06.006] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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22
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Marchetti F, Pampaloni G, Patil Y, Raspolli Galletti AM, Hayatifar M. Easily accessible oxygen-containing derivatives of niobium pentachloride as catalytic precursors for ethylene polymerization. POLYM INT 2011. [DOI: 10.1002/pi.3139] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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23
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Further insights into the chemistry of niobium and tantalum pentahalides with 1,2-dialkoxyalkanes: Synthesis of bromo- and iodoalkoxides, spectroscopic and computational studies. Polyhedron 2011. [DOI: 10.1016/j.poly.2011.03.005] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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24
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Room-temperature long-lived [Nb2F11]− salts of radical cations of simple arenes: EPR, UV–Vis and DFT results. J Organomet Chem 2011. [DOI: 10.1016/j.jorganchem.2010.11.042] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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25
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Marchetti F, Pampaloni G, Patil Y, Galletti AMR, Renili F, Zacchini S. Ethylene Polymerization by Niobium(V) N,N-Dialkylcarbamates Activated with Aluminum Co-catalysts. Organometallics 2011. [DOI: 10.1021/om101187k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Affiliation(s)
- Fabio Marchetti
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, I-56126 Pisa, Italy
| | - Guido Pampaloni
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, I-56126 Pisa, Italy
| | - Yogesh Patil
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, I-56126 Pisa, Italy
| | | | - Filippo Renili
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, I-56126 Pisa, Italy
| | - Stefano Zacchini
- Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy
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26
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Marchetti F, Pampaloni G. Characterization and thermal activation of adducts of Group 4 tetrahalides with 1,2-dialkoxyalkanes. Inorganica Chim Acta 2010. [DOI: 10.1016/j.ica.2010.05.015] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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27
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Davydova E, Sevastianova T, Suvorov A, Timoshkin A. Molecular complexes formed by halides of group 4,5,13–15 elements and the thermodynamic characteristics of their vaporization and dissociation found by the static tensimetric method. Coord Chem Rev 2010. [DOI: 10.1016/j.ccr.2010.04.001] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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28
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Marchetti F, Pampaloni G, Zacchini S. Preparation and Reactivity of Mono‐ and Dinuclear Derivatives of Niobium and Tantalum Pentahalides with Alkyl Aryl Ethers. Eur J Inorg Chem 2010. [DOI: 10.1002/ejic.200900896] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Fabio Marchetti
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy, Fax: +39‐050‐221‐246
| | - Guido Pampaloni
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, 56126 Pisa, Italy, Fax: +39‐050‐221‐246
| | - Stefano Zacchini
- Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Viale Risorgimento 4, 40136 Bologna, Italy
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Dolci S, Marchetti F, Pampaloni G, Zacchini S. A systematic study on the activation of simple polyethers by MoCl5 and WCl6. Dalton Trans 2010; 39:5367-76. [DOI: 10.1039/c001377c] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Marchetti F, Pampaloni G, Zacchini S. 19F NMR spectroscopy as useful tool for determining the structure in solution of coordination compounds of MF5 (M=Nb, Ta). J Fluor Chem 2010. [DOI: 10.1016/j.jfluchem.2009.09.014] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Bini R, Chiappe C, Marchetti F, Pampaloni G, Zacchini S. Structures and Unusual Rearrangements of Coordination Adducts of MX5 (M = Nb, Ta; X = F, Cl) with Simple Diethers. A Crystallographic, Spectroscopic, and Computational Study. Inorg Chem 2009; 49:339-51. [DOI: 10.1021/ic9020806] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Riccardo Bini
- Dipartimento di Chimica, Università di Firenze, Via della Lastruccia 3, I-50019 Sesto Fiorentino, Italy
| | - Cinzia Chiappe
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, I-56126 Pisa, Italy
| | - Fabio Marchetti
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, I-56126 Pisa, Italy
| | - Guido Pampaloni
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Risorgimento 35, I-56126 Pisa, Italy
| | - Stefano Zacchini
- Dipartimento di Chimica Fisica e Inorganica, Università di Bologna, Viale Risorgimento 4, I-40136 Bologna, Italy
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Epoxide ring opening and insertion into the M–X bond of niobium and tantalum pentahalides: Synthesis of dihalide-tris(2-haloalcoholato) complexes. Polyhedron 2009. [DOI: 10.1016/j.poly.2009.02.037] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Marchetti F, Pampaloni G, Zacchini S. Fragmentation of oxygen-containing molecules via C–O bond cleavage promoted by coordination to niobium and tantalum pentahalides. Dalton Trans 2009:6759-72. [DOI: 10.1039/b905023j] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Marchetti F, Pampaloni G, Zacchini S. The reactivity of 1,1-dialkoxyalkanes with niobium and tantalum pentahalides. Formation of coordination compounds, C–H and C–C bond activation and the X-ray structure of the stable carboxonium species [Me2CCHC(OMe)Me][NbCl5(OMe)]. Dalton Trans 2009:8096-106. [DOI: 10.1039/b907774j] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Marchetti F, Pampaloni G, Zacchini S. Unusual room temperature activation of 1,2-dialkoxyalkanes by niobium and tantalum pentachlorides. Dalton Trans 2008:7026-35. [PMID: 19050789 DOI: 10.1039/b810210d] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The outcome of the reactions of MCl(5) (M = Nb, 1a; M = Ta, 1b) with 1,2-dialkoxyalkanes [i.e. MeO(CH(2))(2)OMe (dme), EtO(CH(2))(2)OEt, MeOCH(2)CH(Me)OMe, MeO(CH(2))(2)OCH(2)Cl, MeO(CH(2))(2)O(CH(2))(2)OMe (diglyme)] depends strictly on the stoichiometry. In the 1 : 1 molar ratio reactions, single C-O bond cleavage occurs, resulting in formation of alkyl chloride and of the complexes [upper bond 1 start]MCl(4)[O(R)CH(R')CH(2)O][upper bond 1 end] [M = Nb, R = Me, R' = H, 3a; M = Ta, R = Me, R' = H, 3b; M = Nb, R = Et, R' = H, 5; M = Nb, R = R' = Me, 6; M = Nb, R = CH(2)Cl, R' = H, 7; M = Nb, R = (CH(2))(2)O(Me)NbCl(5), R' = H, 8], which have been characterized spectroscopically. Moreover, minor amounts of the oxo-bridged adducts MOCl(3)(dme)MCl(5) (M = Nb, 4a; M = Ta, 4b) have been isolated in the reactions involving dme. On the other hand, compounds react with two (or more) equivalents of dme mainly via a multiple C-O bond cleavage process, affording MOCl(3)(dme) (M = Nb, 2a; M = Ta, 2b), 1,4-dioxane and methyl chloride. The oxychloride compounds MOCl(3) (M = Nb, 11a; M = Ta, 11b) have been efficiently obtained by addition of TiCl(4) to 2. Compound 2a is reduced in high yield to the Nb(III) species NbCl(3)(dme), 12, upon treatment with SnBu(3)H. The oxychloride NbOCl(3)(diglyme), 9, 1,4-dioxane, CH(3)Cl and the hexachloroniobate salt [MeOCH(2)CH(2)OCH(2)CH(2)O(H)Me][NbCl(6)], 10, have been identified as products of the reaction of 1a with two equivalents of diglyme. The 1 : 2 molar ratio reaction of 1a with MeOCH(2)CH(Me)OMe gives 2,5-dimethyl-1,4-dioxane. Compound 1a reacts with two equivalents of EtO(CH(2))(2)OEt or MeO(CH(2))(2)OCH(2)Cl yielding Cl(CH(2))(2)OCH(2)CH(3) or O(CH(2)Cl)(2) and diglyme, respectively, but not dioxane, suggesting that fragmentation pathways different from that found for dme are operating. The X-ray molecular structures of 4a, 4b and 10 have been determined.
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Affiliation(s)
- Fabio Marchetti
- Università di Pisa, Dipartimento di Chimica e Chimica Industriale, Pisa, Italy
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Marchetti F, Pampaloni G, Zacchini S. The chemistry of niobium and tantalum halides, MX5, with haloacetic acids and their related anhydrides: Anhydride C–H bond activation promoted by MF5. Polyhedron 2008. [DOI: 10.1016/j.poly.2008.03.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Marchetti F, Pampaloni G, Repo T. The Polymerization of Tetrahydrofuran Initiated by Niobium(V) and Tantalum(V) Halides. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200701348] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Marchetti F, Pampaloni G, Zacchini S. Complexes of Niobium(V) and Tantalum(V) Halides with Ligands that Contain N–C=O and P=O Functionalities: A Synthetic and Structural Study. Eur J Inorg Chem 2008. [DOI: 10.1002/ejic.200700911] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Marchetti F, Pampaloni G, Zacchini S. From 1,2-dialkoxyalkanes to 1,4-dioxanes. A transformation mediated by NbCl5via multiple C–O bond cleavage at room temperature. Chem Commun (Camb) 2008:3651-3. [DOI: 10.1039/b804432e] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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