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Hejda M, Doležal L, Blahut J, Hupf E, Tydlitát J, Jambor R, Růžička A, Beckmann J, Dostál L. N-Coordinated tellurenium(II) and telluronium(IV) cations: synthesis, structure and hydrolysis. Dalton Trans 2023; 52:16235-16248. [PMID: 37853810 DOI: 10.1039/d3dt02404k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Abstract
A set of N-coordinated tellurium(II) compounds containing either C,N-chelating ligands CNR (where CN = 2-(RNCH)C6H4, R = tBu or Dipp; Dipp = 2,6-iPr2C6H3) or N,C,N pincer ligands NCNR (where NCN = 2,6-(RNCH)2C6H4, R = tBu or Dipp) were synthesized. In the case of C,N-chelated compounds, the reaction of CNDippLi with Te(dtc)2 (where dtc = Et2NCS2) in a 1 : 1 molar ratio smoothly provided the carbamate CNDippTe(dtc) which upon treatment with 2 eq. of HCl provided the chloride CNDippTeCl. In contrast, the analogous conversion of NCNRLi with Te(dtc)2 surprisingly furnished ionic bromides [NCNRTe]Br as a result of the exchange of dtc by Br coming from nBuBr present in the reaction mixture. Furthermore, the reaction of CNDippTeCl or [NCNRTe]Br with silver salts AgX (X = OTf or SbF6) provided the expected tellurenium cations [CNDippTe]SbF6 and [NCNRTe]X. To further increase the Lewis acidity of the central atom, the oxidation of selected compounds with 1 eq. of SO2Cl2 was examined yielding stable compounds [CNtBuTeCl2]X and [NCNtBuTeCl2]X. The oxidation of the Dipp substituted compounds proved to be more challenging and an excess of SO2Cl2 was necessary to obtain the oxidized products [CNDippTeCl2]SbF6 and [NCNDippTeCl2]SbF6, which could solely be characterized in solution. Compounds [CNtBuTeCl2]OTf and [NCNtBuTeCl2]OTf were shown to undergo a controlled hydrolysis to the corresponding telluroxanes. All compounds were studied by multinuclear NMR spectroscopy in solution and for selected compounds solid state 125Te NMR spectroscopy and single-crystal X-ray diffraction analysis were performed. The Lewis acidity of the studied cations was examined by the Gutmann-Beckett method using Et3PO as the probing agent. The Te-N chalcogen bonding situation of selected compounds has also been examined computationally by a set of real-space bonding indicators.
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Affiliation(s)
- Martin Hejda
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic.
| | - Lukáš Doležal
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic.
| | - Jan Blahut
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Science, Flemingovo nám. 2, 16610, Prague, Czech Republic
| | - Emanuel Hupf
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße 7, 28359 Bremen, Germany.
| | - Jiří Tydlitát
- Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic
| | - Roman Jambor
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic.
| | - Aleš Růžička
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic.
| | - Jens Beckmann
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße 7, 28359 Bremen, Germany.
| | - Libor Dostál
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic.
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Vikram Lokhande S, Tyagi A, Butcher RJ, Karmakar G, Singh Chauhan R. Study of an interesting interplay between thiourea and 4,6-dimethylpyrimidine-2-thiol with palladium(II) phosphine substrate. Polyhedron 2022. [DOI: 10.1016/j.poly.2022.116221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Arora A, Oswal P, Sharma D, Tyagi A, Purohit S, Sharma P, Kumar A. Molecular Organosulphur, Organoselenium and Organotellurium Complexes as Homogeneous Transition Metal Catalytic Systems for Suzuki Coupling. ChemistrySelect 2022. [DOI: 10.1002/slct.202201704] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Aayushi Arora
- Department of Chemistry School of Physical Sciences Doon University Dehradun 248012 India
| | - Preeti Oswal
- Department of Chemistry School of Physical Sciences Doon University Dehradun 248012 India
| | - Deepali Sharma
- Department of Chemistry School of Physical Sciences Doon University Dehradun 248012 India
| | - Anupma Tyagi
- Department of Chemistry School of Physical Sciences Doon University Dehradun 248012 India
| | - Suraj Purohit
- Department of Chemistry School of Physical Sciences Doon University Dehradun 248012 India
| | - Pankaj Sharma
- Instituto de Química National Autonomous University of Mexico (UNAM) Circuito Exterior Mexico 04510
| | - Arun Kumar
- Department of Chemistry School of Physical Sciences Doon University Dehradun 248012 India
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Kumar R, Bhasin K, Dhau JS, Singh A. Synthesis and characterization of 3-pyridylchalcogen compounds. INORG CHEM COMMUN 2022. [DOI: 10.1016/j.inoche.2022.109344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Liu BX, Wang F, Chen Y, Rao W, Shen SS, Wang SY. Visible-Light-Promoted Denitrogenative Ortho-selenylation Reaction of benzotriazinones: Synthesis of ortho-selenylated Benzamides, Ebselen Analogs. Org Chem Front 2022. [DOI: 10.1039/d2qo00121g] [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
A visible-light-promoted regioselective denitrogenative cross-coupling between benzotriazinones and selenosulfonates is reported. This protocol allows for the convenient synthesis of ortho-selenylated benzamides in good yields from readily available starting materials under...
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Popa RA, Lippolis V, Silvestru A. Cu(II) and Ag(I) complexes of the pyrazole-derived diorganoselenide (pzCH2CH2)2Se. Synthesis, solid state structure and solution behavior. Inorganica Chim Acta 2021. [DOI: 10.1016/j.ica.2021.120272] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Rafique J, Rampon DS, Azeredo JB, Coelho FL, Schneider PH, Braga AL. Light-mediated Seleno-Functionalization of Organic Molecules: Recent Advances. CHEM REC 2021; 21:2739-2761. [PMID: 33656248 DOI: 10.1002/tcr.202100006] [Citation(s) in RCA: 17] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2021] [Revised: 02/12/2021] [Accepted: 02/18/2021] [Indexed: 01/21/2023]
Abstract
Organoselenium compounds constitute an important class of substances with applications in the biological, medicinal and material sciences as well as in modern organic synthesis, attracting considerable attention from the scientific community. Therefore, the construction of the C-Se bond via facile, efficient and sustainable strategies to access complex scaffolds from simple substrates are an appealing and hot topic. Visible light can be regarded as an alternative source of energy and is associated with environmentally-friendly processes. Recently, the use of visible-light mediated seleno-functionalization has emerged as an ideal and powerful route to obtain high-value selenylated products, with diminished cost and waste. This approach, involving photo-excited substrates/catalyst and single-electron transfer (SET) between substrates in the presence of visible light has been successfully used in the versatile and direct insertion of organoselenium moieties in activated and unactivated C(sp3 )-H, C(sp2 )-H, C(sp)-H bonds as well as C-heteroatom bonds. In most cases, ease of operation and accessibility of the light source (LEDs or commercial CFL bulbs) makes this approach more attractive and sustainable than the traditional strategies.
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Affiliation(s)
- Jamal Rafique
- Instituto de Química (INQUI), Universidade Federal de Mato Grosso do Sul -UFMS, Campo Grande, 79074-460, MS -, Brazil
| | - Daniel S Rampon
- Departamento de Química, Universidade Federal do Paraná (UFPR), Curitiba, 81531-990, PR Brazil
| | - Juliano B Azeredo
- Departamento de Farmácia, Universidade Federal do Pampa, Uruguaiana, 97500-970, RS -, Brazil
| | - Felipe L Coelho
- Instituto de Química, Departamento de Química Orgânica, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, 91501-970, RS, Brazil
| | - Paulo H Schneider
- Instituto de Química, Departamento de Química Orgânica, Universidade Federal do Rio Grande do Sul (UFRGS), Porto Alegre, 91501-970, RS, Brazil
| | - Antonio L Braga
- Departamento de Química, Universidade Federal de Santa Catarina-UFSC, Florianópolis, 88040-900, SC, Brazil
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