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Holub J, Bakardjiev M, McKee ML, Hnyk D. Ten-vertex closo-carboranes react with “wet” fluoride: a direct closo-to-arachno transformation as a result of a hydride transfer. Inorganica Chim Acta 2022. [DOI: 10.1016/j.ica.2022.121000] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Bakardjiev M, Holub J, Bavol D, Vrána J, Samsonov MA, Růžička A, Růžičková Z, Fanfrlík J, Hnyk D. Thiaborane Icosahedral Barrier Increased by the Functionalization of all Terminal Hydrogens in closo-1-SB 11H 11. Inorg Chem 2021; 60:8428-8431. [PMID: 34101456 DOI: 10.1021/acs.inorgchem.1c00796] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The electrophilic substitution of icosahedral closo-1-SB11H11 with methyl iodide has resulted in two B-functionalized thiaboranes, 7,12-I2-2,3,4,5,6,8,9,10,11-(CH3)9-1-closo-SB11 and 7,8,12-I3-2,3,4,5,6,9,10,11-(CH3)8-closo-1-SB11, with the former being significantly predominant. These two icosahedral thiaboranes are the first cases of polysubstituted polyhedral boron clusters with another vertex that differs from B and C. Such polyfunctionalizations have increased the earlier observed thiaborane icosahedral barrier, not exhibiting any reactivity toward bases, unlike the parent thiaborane. The search for methylation pathways has revealed that the complete B11-methylation is impossible, like in the case of decaborane(14), where this seems to be a result of the positively charged upper parts of these two molecules.
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Affiliation(s)
- Mario Bakardjiev
- Institute of Inorganic Chemistry, Czech Academy of Sciences, 250 68 Husinec-Řež, Czech Republic
| | - Josef Holub
- Institute of Inorganic Chemistry, Czech Academy of Sciences, 250 68 Husinec-Řež, Czech Republic
| | - Dmytro Bavol
- Institute of Inorganic Chemistry, Czech Academy of Sciences, 250 68 Husinec-Řež, Czech Republic
| | - Jan Vrána
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic
| | - Maksim A Samsonov
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic
| | - Aleš Růžička
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic
| | - Zdeňka Růžičková
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10 Pardubice, Czech Republic
| | - Jindřich Fanfrlík
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Sciences, Flemingovo nám. 2, 166 10 Praha 6, Czech Republic
| | - Drahomír Hnyk
- Institute of Inorganic Chemistry, Czech Academy of Sciences, 250 68 Husinec-Řež, Czech Republic
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Holub J, Růžička A, Růžičková Z, Fanfrlík J, Hnyk D, Štíbr B. Electrophilic Methylation of Decaborane(14): Selective Synthesis of Tetramethylated and Heptamethylated Decaboranes and Their Conjugated Bases. Inorg Chem 2020; 59:10540-10547. [DOI: 10.1021/acs.inorgchem.0c00917] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Josef Holub
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež 250 68, Czech Republic
| | - Aleš Růžička
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 532 10, Czech Republic
| | - Zdeňka Růžičková
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, Pardubice 532 10, Czech Republic
| | - Jindřich Fanfrlík
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences, Flemingovo nám. 2, Praha 6 166 10, Czech Republic
| | - Drahomír Hnyk
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež 250 68, Czech Republic
| | - Bohumil Štíbr
- Institute of Inorganic Chemistry of the Czech Academy of Sciences, Husinec-Řež 250 68, Czech Republic
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Holub J, Vrána J, Růžička A, Růžičková Z, Fanfrlík J, Hnyk D. Thiaboranes on Both Sides of the Icosahedral Barrier: Retaining and Breaking the Barrier with Carbon Functionalities. Chempluschem 2020; 84:822-827. [PMID: 31944001 DOI: 10.1002/cplu.201900115] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2019] [Revised: 05/16/2019] [Indexed: 11/08/2022]
Abstract
The concept of icosahedral barrier has been expanded from the chemistry of carbaboranes to the area of thiaboranes. Both representatives of this barrier, i. e., closo-1,2-C2 B10 H12 and closo-1-SB11 H11 , are similar in their electron distribution, which is dominated by positive charge in the midpoint of the C-C vector and on the sulfur atom with experimentally determined dipole moments of 4.50 D and 3.64 D, respectively. This is a driving force for their reactivity as exemplified by their reactions with different carbon functionalities. Icosahedral closo-1-SB11 H11 reacts both with an electron sextet containing carbon (in the form of N-heterocyclic carbenes), reported earlier, and with methyl iodide with an electron octet on the carbon. The latter reaction provides hexamethylated thiaborane on the basis of methylation so far unknown in this area of heteroborane chemistry. The computations of the heat of formation (ΔHf 298 ) make it possible to estimate the height of the barrier as well as to propose closo-thiaboranes beyond the barrier. Eleven and twelve vertex thiaboranes with nido electron count are known experimentally for breaking the barrier. These computations also suggest that the larger nido-thiaboranes are promising candidates for the corresponding experimental availability, i. e., the ΔHf 298 of a 13-vertex nido-thiaborane cluster has been computed to be more negative than that of the well-known nido-SB10 H11 - cluster (-6.7 and -5.6 kcal mol-1 per vertex, respectively).
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Affiliation(s)
- Josef Holub
- Institute of Inorganic Chemistry, of the Czech Academy of Sciences, 250 68, Husinec-Řež, Czech Republic
| | - Jan Vrána
- Department of General and Inorganic Chemistry Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10, Pardubice, Czech Republic
| | - Aleš Růžička
- Department of General and Inorganic Chemistry Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10, Pardubice, Czech Republic
| | - Zdeňka Růžičková
- Department of General and Inorganic Chemistry Faculty of Chemical Technology, University of Pardubice, Studentská 573, 532 10, Pardubice, Czech Republic
| | - Jindřich Fanfrlík
- Institute of Organic Chemistry and Biochemistry, of the Czech Academy of Sciences, 166 10, Praha 6, Czech Republic
| | - Drahomír Hnyk
- Institute of Inorganic Chemistry, of the Czech Academy of Sciences, 250 68, Husinec-Řež, Czech Republic
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Bakardjiev M, Růžička A, Růžičková Z, Tok OL, Holub J, Hnyk D, Fanfrlík J, Štíbr B. Synthesis of closo-1,2-H 2C 2B 8Me 8 and 1,2-H 2C 2B 8Me 7X (X = I and OTf) Dicarbaboranes and Their Rearrangement Reactions. Inorg Chem 2019; 58:2865-2871. [PMID: 30730720 DOI: 10.1021/acs.inorgchem.8b03550] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Methyl-camouflaged dicarbaboranes closo-1,2- and 1,10-H2C2B8Me8 have been prepared in high yields either from nido-5,6-H2C2B8H10 or closo-1,2-H2C2B8H8 via electrophilic methylation reactions and cluster-rearrangement methods. Prepared were also monosubstituted derivatives of general formulation closo-H2C2B8Me7-X (X = I or OTf). The permethylated compounds exhibit extreme air stability in comparison to unprotected counterparts as a consequence of rigid, egg-shaped hydrocarbon structures incorporating inner C2B8 carborane scaffolding. The structures of all compounds isolated were confirmed unambiguously by multinuclear (11B, 1H, 13C, and 19F) NMR measurements, supported by X-ray diffraction analyses and geometry optimization methods on several compounds.
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Affiliation(s)
- Mario Bakardjiev
- Institute of Inorganic Chemistry of the Czech Academy of Sciences , 250 68 Husinec-Řež , Czech Republic
| | - Aleš Růžička
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology , University of Pardubice , Studentská 573 , 532 10 Pardubice , Czech Republic
| | - Zdeňka Růžičková
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology , University of Pardubice , Studentská 573 , 532 10 Pardubice , Czech Republic
| | - Oleg L Tok
- Institute of Inorganic Chemistry of the Czech Academy of Sciences , 250 68 Husinec-Řež , Czech Republic
| | - Josef Holub
- Institute of Inorganic Chemistry of the Czech Academy of Sciences , 250 68 Husinec-Řež , Czech Republic
| | - Drahomír Hnyk
- Institute of Inorganic Chemistry of the Czech Academy of Sciences , 250 68 Husinec-Řež , Czech Republic
| | - Jindřich Fanfrlík
- Institute of Organic Chemistry and Biochemisty , of the Czech Academy of Sciences , Flemingovo nám, 5 , Prague 6 , Czech Republic
| | - Bohumil Štíbr
- Institute of Inorganic Chemistry of the Czech Academy of Sciences , 250 68 Husinec-Řež , Czech Republic
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Bakardjiev M, Tok OL, Růžička A, Růžičková Z, Holub J, Hnyk D, Fanfrlík J, Štíbr B. Quantitative syntheses of permethylated closo-1,10-R 2C 2B 8Me 8 (R = H, Me) carboranes. Egg-shaped hydrocarbons on the Frontier between inorganic and organic chemistry. RSC Adv 2018; 8:38238-38244. [PMID: 35559069 PMCID: PMC9090134 DOI: 10.1039/c8ra06640j] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2018] [Accepted: 10/31/2018] [Indexed: 11/25/2022] Open
Abstract
Electrophilic methylation of the closo-1,10-R2C2B8H8 (1) (R = H or Me) dicarbaboranes at higher temperatures or thermal rearrangement of the 1,6-R2C2B8Me8 (3) compounds at 400-500 °C generated the B-permethylated derivatives closo-1,10-R2C2B8Me8 (2) in quantitative (>95%) yields. The compounds exhibit extreme air stability as a consequence of a rigid, egg shaped hydrocarbon structures incorporating inner 1,10-C2B8 carborane core.
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Affiliation(s)
- Mario Bakardjiev
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic Husinec-Řež 1001 Czech Republic
| | - Oleg L Tok
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic Husinec-Řež 1001 Czech Republic
| | - Aleš Růžička
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice Studentská 573 532 10 Pardubice Czech Republic
| | - Zdeňka Růžičková
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice Studentská 573 532 10 Pardubice Czech Republic
| | - Josef Holub
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic Husinec-Řež 1001 Czech Republic
| | - Drahomír Hnyk
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic Husinec-Řež 1001 Czech Republic
| | - Jindřich Fanfrlík
- Institute of Organic Chemistry and Biochemistry of the Czech Academy of Sciences Flemingovo nám. 2, 166 10 Prague 6 Czech Republic
| | - Bohumil Štíbr
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic Husinec-Řež 1001 Czech Republic
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