1
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Synthesis and structure of 1-(p-cyanophenyl)-1-carba-closo-decaborate [1-(p-NCC6H4)-1-CB9H9]−. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3425-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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2
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Shmal'ko AV, Cendoya P, Anufriev SA, Suponitsky KY, Gabel D, Sivaev IB. New approaches to the functionalization of the 1-carba- closo-decaborate anion. Chem Commun (Camb) 2022; 58:3775-3778. [PMID: 35234218 DOI: 10.1039/d1cc06395b] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Two new approaches to the functionalization of the 1-carba-closo-decaborate anion [1-CB9H10]- at boron atoms via the ring-opening of its 1,4-dioxane derivative with various nucleophiles and Pd-catalysed cross-coupling of its iodo derivative with aromatic amines and heteroaromatics were developed.
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Affiliation(s)
- Akim V Shmal'ko
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Str, Moscow, 119991, Russia. .,Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, Bremen, 28759, Germany
| | - Paula Cendoya
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, Bremen, 28759, Germany
| | - Sergey A Anufriev
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Str, Moscow, 119991, Russia.
| | - Kyrill Yu Suponitsky
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Str, Moscow, 119991, Russia.
| | - Detlef Gabel
- Department of Life Sciences and Chemistry, Jacobs University Bremen, Campus Ring 1, Bremen, 28759, Germany
| | - Igor B Sivaev
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, 28 Vavilov Str, Moscow, 119991, Russia.
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3
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Li S, Zhang Y, Ma Y, Qiu P, Chen X. Improved and Scalable Synthesis of [Et4N][closo-1-CHB9H9]. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00478] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shouhu Li
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yichun Zhang
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Yiming Ma
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Pengtao Qiu
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xuenian Chen
- School of Chemistry and Chemical Engineering, Henan Key Laboratory of Boron Chemistry and Advanced Energy Materials, Henan Normal University, Xinxiang, Henan 453007, China
- Green Catalysis Center and College of Chemistry, Zhengzhou University, Zhengzhou, Henan 450001, China
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4
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Shen Y, Zhang K, Liang X, Dontha R, Duttwyler S. Highly selective palladium-catalyzed one-pot, five-fold B-H/C-H cross coupling of monocarboranes with alkenes. Chem Sci 2019; 10:4177-4184. [PMID: 31057746 PMCID: PMC6471670 DOI: 10.1039/c9sc00078j] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2019] [Accepted: 03/03/2019] [Indexed: 01/07/2023] Open
Abstract
Palladium-catalyzed dehydrogenative B-H/C-H cross coupling of monocarborane anions with alkenes is reported, allowing for the first time the isolation of selectively penta-alkenylated boron clusters. The reaction cascade is regioselective for the cage positions, leading directly to B2-6 functionalization. Under mild and convenient conditions, styrenes, benzylic alkenes and aliphatic alkenes are demonstrated to be viable coupling partners with exclusive vinyl-type B-C bond formation. Multiple subsequent transformations provide access to directing group-free products, chiral derivatives and penta-alkylated cages. The five-fold coupling, combined with the latter reactions, represents a powerful methodology for the straightforward synthesis of new classes of boron clusters.
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Affiliation(s)
- Yunjun Shen
- Department of Chemistry , Zhejiang University , 310027 Hangzhou , Zhejiang , P. R. China .
| | - Kang Zhang
- Department of Chemistry , Zhejiang University , 310027 Hangzhou , Zhejiang , P. R. China .
| | - Xuewei Liang
- Department of Chemistry , Zhejiang University , 310027 Hangzhou , Zhejiang , P. R. China .
| | - Rakesh Dontha
- Department of Chemistry , Zhejiang University , 310027 Hangzhou , Zhejiang , P. R. China .
| | - Simon Duttwyler
- Department of Chemistry , Zhejiang University , 310027 Hangzhou , Zhejiang , P. R. China .
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5
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Lin F, Yu JL, Shen Y, Zhang SQ, Spingler B, Liu J, Hong X, Duttwyler S. Palladium-Catalyzed Selective Five-Fold Cascade Arylation of the 12-Vertex Monocarborane Anion by B–H Activation. J Am Chem Soc 2018; 140:13798-13807. [DOI: 10.1021/jacs.8b07872] [Citation(s) in RCA: 69] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Furong Lin
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Jing-Lu Yu
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Yunjun Shen
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Shuo-Qing Zhang
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Bernhard Spingler
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zurich, Switzerland
| | - Jiyong Liu
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Xin Hong
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
| | - Simon Duttwyler
- Department of Chemistry, Zhejiang University, 38 Zheda Road, 310027 Hangzhou, People’s Republic of China
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6
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Żurawiński R, Jakubowski R, Domagała S, Kaszyński P, Woźniak K. Regioselective Functionalization of the [ closo-1-CB 9H 10] - Anion through Iodonium Zwitterions. Inorg Chem 2018; 57:10442-10456. [PMID: 30067341 DOI: 10.1021/acs.inorgchem.8b01701] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Reactions of [ closo-1-CB9H9-1-R]- (2, R = H, COOH, C5H11) with PhI(OAc)2 lead to mixtures of regioisomers [ closo-1-CB9H8-1-R-6-IPh] (5[6]) and [ closo-1-CB9H8-1-R-10-IPh] (5[10]) in ratios of ∼3:1 to 1:1, of which the former isomer undergoes selective reactions with nucleophiles (MeCN, pyridine, MeC(═NH)NH2, CN-). The products and the unreacted 10-isomers 5[10] are separated achieving kinetic resolution of the isomeric iodonium zwitterions. Pure 5[10] is reacted with nucleophiles (pyridine, 4-C7H15OPyridine, Me2NCHS, PhCO2-, CN-, N3-, I-, MeC(═NH)NH2, and MeCN), giving substitution products. The mechanism of the substitution is investigated with density functional theory (DFT) methods. Some of the nucleophilic substitution products are transformed further, expanding the scope of available functional groups for the [ closo-1-CB9H10]- anion. Four derivatives are characterized with single-crystal XRD methods: [ closo-1-CB9H9-10-N2] (4[10]a), [ closo-1-CB9H9-6-NC5H5] (9[6]a), [ closo-1-CB9H9-10-NC5H5] (9[10]a), and [ closo-1-CB9H9-10-NHC(NH2)Me] (10[10]a). Spectroscopic data for selected derivatives are interpreted in terms of transmission of electronic effects through the { closo-1-CB9} cluster (NMR) and interaction with substituents (IR, UV). The latter results are compared to those of TD-DFT computational methods.
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Affiliation(s)
- Remigiusz Żurawiński
- Centre of Molecular and Macromolecular Studies , Polish Academy of Sciences , 90-363 Łódź , Poland.,Department of Chemistry , Middle Tennessee State University , Murfreesboro , Tennessee 37130 , United States
| | - Rafał Jakubowski
- Centre of Molecular and Macromolecular Studies , Polish Academy of Sciences , 90-363 Łódź , Poland.,Department of Chemistry , Middle Tennessee State University , Murfreesboro , Tennessee 37130 , United States
| | - Sławomir Domagała
- Department of Chemistry , University of Warsaw , 02-089 Warsaw , Poland
| | - Piotr Kaszyński
- Centre of Molecular and Macromolecular Studies , Polish Academy of Sciences , 90-363 Łódź , Poland.,Department of Chemistry , Middle Tennessee State University , Murfreesboro , Tennessee 37130 , United States.,Faculty of Chemistry , University of Łódź , 91-403 Łódź , Poland
| | - Krzysztof Woźniak
- Department of Chemistry , University of Warsaw , 02-089 Warsaw , Poland
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7
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Liang X, Shen Y, Zhang K, Liu J, Duttwyler S. Rhodium(iii)-catalyzed dehydrogenative dialkenylation of the monocarba-closo-decaborate cluster by regioselective B–H activation. Chem Commun (Camb) 2018; 54:12451-12454. [DOI: 10.1039/c8cc05983g] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
The regioselective double B–H activation of the {CB9} carborane by rhodium catalysis is reported, affording novel inorganic–organic hybrid clusters.
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Affiliation(s)
- Xuewei Liang
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P. R. China
| | - Yunjun Shen
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P. R. China
| | - Kang Zhang
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P. R. China
| | - Jiyong Liu
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P. R. China
| | - Simon Duttwyler
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P. R. China
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8
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Rzeszotarska E, Novozhilova I, Kaszyński P. Convenient Synthesis of [closo-B10H9-1-I]2– and [closo-B10H8-1,10-I2]2– Anions. Inorg Chem 2017; 56:14351-14356. [DOI: 10.1021/acs.inorgchem.7b02477] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Edyta Rzeszotarska
- Centre of Molecular
and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza
112, 90363 Łódź, Poland
| | - Irina Novozhilova
- Organic Materials Research Group, Department
of Chemistry, Middle Tennessee State University, Murfreesboro, Tennessee 37132, United States
| | - Piotr Kaszyński
- Centre of Molecular
and Macromolecular Studies, Polish Academy of Sciences, Sienkiewicza
112, 90363 Łódź, Poland
- Organic Materials Research Group, Department
of Chemistry, Middle Tennessee State University, Murfreesboro, Tennessee 37132, United States
- Faculty of Chemistry, University of Łódź, Tamka 12, 91403 Łódź, Poland
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9
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Lin F, Shen Y, Zhang Y, Sun Y, Liu J, Duttwyler S. Fusing Carborane Carboxylic Acids with Alkynes: 3D Analogues of Isocoumarins via Regioselective B−H Activation. Chemistry 2017; 24:551-555. [DOI: 10.1002/chem.201703802] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Furong Lin
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Yunjun Shen
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Yuanbin Zhang
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Yuji Sun
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Jiyong Liu
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
| | - Simon Duttwyler
- Department of Chemistry; Zhejiang University; 38 Zheda Road 310027 Hangzhou P. R. China
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10
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Shen Y, Pan Y, Zhang K, Liang X, Liu J, Spingler B, Duttwyler S. B–H functionalization of the monocarba-closo-dodecaborate anion by rhodium and iridium catalysis. Dalton Trans 2017; 46:3135-3140. [DOI: 10.1039/c7dt00269f] [Citation(s) in RCA: 49] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The regioselective derivatization of the monocarba-closo-dodecaborate anion via catalytic B–H bond activation is reported.
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Affiliation(s)
- Yunjun Shen
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
| | - Yani Pan
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
| | - Kang Zhang
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
| | - Xuewei Liang
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
| | - Jiyong Liu
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
| | | | - Simon Duttwyler
- Department of Chemistry
- Zhejiang University
- 310027 Hangzhou
- P.R. China
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11
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Tok OL, Bakardjiev M, Štíbr B, Hnyk D, Holub J, Padělková Z, Růžička A. Click Dehydrogenation of Carbon-Substituted nido-5,6-C2B8H12 Carboranes: A General Route to closo-1,2-C2B8H10 Derivatives. Inorg Chem 2016; 55:8839-43. [PMID: 27551885 DOI: 10.1021/acs.inorgchem.6b01386] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Triethylamine-catalyzed dehydrogenation of carbon-disubstituted dicarbaboranes 5,6-R2-nido-5,6-C2B8H10 [1, where R = H (1a), Me (1b), and Ph (1c)] in refluxing acetonitrile leads to a high-yield (up to 85-95%) formation of a series of dicarbaboranes 1,2-R2-closo-1,2-C2B8H8 (2). The monosubstituted 6-R-nido-5,6-C2B8H11 (3) analogues [where R = Ph (3a), naph (1-naphthyl; 3b), Bu (3c)] afforded 1-R-1,2-closo C2B8H9 (4) isomers [where R = Ph (4a), naph (4b), n-Bu (4c)] as the main products; compounds 4a and 4c were accompanied by 2-R-1,2-C2B8H9 (5) isomers (total yields up to 90%), with the 4/5 molar ratio being strongly dependent on the nature of R (4:1 and 1:1, respectively). All of these cage-closure reactions are supposed to proceed via the stage of the corresponding Et3NH(+) salts of nido anions [5,6-R2-5,6-C2B8H9](-) (1(-)) and [6-R-5,6-C2B8H10](-) (3(-)), which lose H2 and Et3N upon heating (dehydrodeamination). The cage-closure mechanisms leading to closo isomers 2, 4, and 5 have been substantiated by B3LYP/6-31+G* calculations of the reaction profile for a simple 1a(-) → 2a + H(-) conversion. All of the compounds isolated have been characterized by multinuclear ((11)B, (1)H, and (13)C) NMR spectroscopy, mass spectrometry, and elemental analyses, and the structure of 1-Ph-closo-1,2-C2B8H9 (4a) was established by an X-ray diffraction study.
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Affiliation(s)
- Oleg L Tok
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic , 25068 Řež, Czech Republic
| | - Mario Bakardjiev
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic , 25068 Řež, Czech Republic
| | - Bohumil Štíbr
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic , 25068 Řež, Czech Republic
| | - Drahomír Hnyk
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic , 25068 Řež, Czech Republic
| | - Josef Holub
- Institute of Inorganic Chemistry, Academy of Sciences of the Czech Republic , 25068 Řež, Czech Republic
| | - Zdenka Padělková
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice , Studentská 573, 53210 Pardubice, Czech Republic
| | - Aleš Růžička
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice , Studentská 573, 53210 Pardubice, Czech Republic
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12
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Silver and Copper Complexes with closo-Polyhedral Borane, Carborane and Metallacarborane Anions: Synthesis and X-ray Structure. CRYSTALS 2016. [DOI: 10.3390/cryst6050060] [Citation(s) in RCA: 60] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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13
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Otsuka M, Takita R, Kanazawa J, Miyamoto K, Muranaka A, Uchiyama M. Conjugation between σ- and π-Aromaticity in 1-C-Arylated Monocarba-closo-dodecaborate Anions. J Am Chem Soc 2015; 137:15082-5. [DOI: 10.1021/jacs.5b10321] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Mai Otsuka
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo,
Bunkyo-ku, Tokyo 113-0033, Japan
| | - Ryo Takita
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Junichiro Kanazawa
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo,
Bunkyo-ku, Tokyo 113-0033, Japan
| | - Kazunori Miyamoto
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo,
Bunkyo-ku, Tokyo 113-0033, Japan
| | - Atsuya Muranaka
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
| | - Masanobu Uchiyama
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo,
Bunkyo-ku, Tokyo 113-0033, Japan
- RIKEN Center for Sustainable Resource Science, 2-1 Hirosawa, Wako-shi, Saitama 351-0198, Japan
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14
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Bakardjiev M, Štíbr B, Holub J, Padělková Z, Růžička A. Simple Synthesis, Halogenation, and Rearrangement of closo-1,6-C2B8H10. Organometallics 2015. [DOI: 10.1021/om500988z] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Mario Bakardjiev
- Institute of Inorganic
Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic
| | - Bohumil Štíbr
- Institute of Inorganic
Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic
| | - Josef Holub
- Institute of Inorganic
Chemistry, Academy of Sciences of the Czech Republic, 250 68 Řež, Czech Republic
| | - Zdenka Padělková
- 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
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15
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Hailmann M, Konieczka SZ, Himmelspach A, Löblein J, Reiss GJ, Finze M. Carba-closo-dodecaborate anions with two functional groups: [1-R-12-HC≡C-closo-1-CB₁₁H₁₀]⁻ (R = CN, NC, CO₂H, C(O)NH₂, NHC(O)H). Inorg Chem 2014; 53:9385-99. [PMID: 25140733 DOI: 10.1021/ic501526g] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Disubstituted carba-closo-dodecaborate anions with one functional group bonded to the cluster carbon atom and one ethynyl group bonded to the antipodal boron atom were synthesized from easily accessible {closo-1-CB11} clusters. [Et4N][1-NC-12-HC≡C-closo-1-CB11H10] ([Et4N]4b) was prepared starting from Cs[12-Et3SiC≡C-closo-1-CB11H11] (Cs1c) via salts of the anions [1-HO(O)C-12-HC≡C-closo-1-CB11H10](-) (2b) and [1-H2N(O)C-12-HC≡C-closo-1-CB11H10](-) (3b). In a similar reaction sequence [Et4N][1-CN-12-HC≡C-closo-1-CB11H10] ([Et4N]7b) was obtained from Cs[1-H2N-12-HC≡C-closo-1-CB11H10] (Cs5b) by formamidation to yield [Et4N][1-H(O)CHN-12-HC≡C-closo-1-CB11H10] ([Et4N]6b) and successive dehydration. In addition, the synthesis of the isonitrile [Et4N][1-CN-closo-1-CB11H11] ([Et4N]7a) is presented. The {closo-1-CB11} derivatives were characterized by multinuclear NMR as well as vibrational spectroscopy, mass spectrometry, and elemental analysis. The crystal structures of [Et4N][1-HO(O)C-12-HC≡C-closo-1-CB11H10] ([Et4N]2b), [Et4N][1-H2N(O)C-12-HC≡C-closo-1-CB11H10] ([Et4N]3b), [Et4N][1-NC-12-HC≡C-closo-1-CB11H10] ([Et4N]4b), [Et4N][1-H(O)CHN-12-HC≡C-closo-1-CB11H10] ([Et4N]6b), [Et4N][1-CN-12-HC≡C-closo-1-CB11H10] ([Et4N]7b), and K[1-H(O)CHN-closo-1-CB11H11] ([Et4N]6a) were determined. The transmission of electronic effects through the carba-closo-dodecaboron cage was studied based on (13)C NMR spectroscopic data, by results derived from density functional theory calculations, and by a comparison to the data of related benzene and bicyclo[2.2.2]octane derivatives.
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Affiliation(s)
- Michael Hailmann
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg , Am Hubland, 97074 Würzburg, Germany
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16
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Douvris C, Michl J. Update 1 of:Chemistry of the Carba-closo-dodecaborate(−) Anion, CB11H12–. Chem Rev 2014; 113:PR179-233. [PMID: 23944158 DOI: 10.1021/cr400059k] [Citation(s) in RCA: 159] [Impact Index Per Article: 15.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christos Douvris
- Institute of Organic Chemistry and Biochemistry, Academy of Science of the Czech Republic, 16610 Prague, Czech Republic
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
| | - Josef Michl
- Institute of Organic Chemistry and Biochemistry, Academy of Science of the Czech Republic, 16610 Prague, Czech Republic
- Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, United States
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17
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Carbon insertion into borane clusters via nucleophilic addition reactions of borane and carborane anions. J Organomet Chem 2013. [DOI: 10.1016/j.jorganchem.2013.04.010] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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19
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Hailmann M, Herkert L, Himmelspach A, Finze M. Difunctionalized {closo-1-CB11} Clusters: 1- and 2-Amino-12-ethynylcarba-closo-dodecaborates. Chemistry 2013; 19:15745-58. [DOI: 10.1002/chem.201302931] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2013] [Indexed: 11/07/2022]
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20
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Ringstrand B. Boron clusters as structural elements of novel liquid crystalline materials. LIQUID CRYSTALS TODAY 2013. [DOI: 10.1080/1358314x.2013.829932] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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21
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Kazheva ON, Rudakov DA, Shilov GV, D’yachenko OA, Potkin VI. Structure of 6,11-dichloro-9-dimethylthio-7,8-dicarba-nido-undecaborane [6,11-Cl2-9-SMe2-7,8-C2B9H9]. J STRUCT CHEM+ 2013. [DOI: 10.1134/s0022476613020108] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Kononova E, Klemenkova Z. The electronic structure of nido-B10H14 and [6-Ph-nido-6-CB9H11]− in terms of Bader’s theory (AIM). J Mol Struct 2013. [DOI: 10.1016/j.molstruc.2012.11.053] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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23
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Ringstrand B, Kaszynski P. Functionalization of the [closo-1-CB9H10]- anion for the construction of new classes of liquid crystals. Acc Chem Res 2013; 46:214-25. [PMID: 23098274 DOI: 10.1021/ar300081b] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
The [closo-1-CB(9)H(10)](-) anion is a member of an extensive family of σ-aromatic closo-boranes that possess impressive stability and functionalization characteristics. In contrast to its bigger, more extensively studied brother, the [closo-1-CB(11)H(12)](-) anion, convenient access to the [closo-1-CB(9)H(10)](-) anion has only been recently established, and researchers have only begun to develop and understand its fundamental chemistry. The geometrical and electronic properties of the [closo-1-CB(9)H(10)](-) anion make it an attractive structural element of novel classes of either zwitterionic or ionic liquid crystals suitable for electro-optical and ion transport applications, respectively. Such materials require a 1,10-difunctionalized [closo-1-CB(9)H(10)](-) anion that permits for the formation of molecules of elongated shape. The covalent attachment of an onium fragment or the use of a counterion compensates for the negative charge. This Account highlights the progress made in the advancement and understanding of the fundamental chemistry of the [closo-1-CB(9)H(10)](-) anion. We also describe the development of 1,10-difunctionalized derivatives as key intermediates in the preparation of new classes of liquid crystalline materials. We obtained the first isomerically pure 1,10-difunctionalized derivative of the [closo-1-CB(9)H(10)](-) anion, iodo acid [closo-1-CB(9)H(8)-1-COOH-10-I](-), from decaborane through the Brellochs reaction. Functional group transformation of the C(1)-carboxyl group led to a 1-amino derivative and, subsequently, to a synthetically valuable 1-dinitrogen derivative. The latter exhibits reactivity typical for PhN(2)(+) and undergoes diazocoupling and Gomberg-Bachmann arylation reactions. The B(10)-iodine participated in Negishi alkylation and Buchwald-Hartwig amination reactions, leading to 10-hexyl and 10-amino carboxylic acids, respectively. We converted the 10-amino carboxylic acid to a 10-dinitrogen acid [closo-1-CB(9)H(8)-1-COOH-10-N(2)], which proved to be synthetically valuable in the preparation of 10-pyridinium and 10-sulfonium zwitterionic acids and their liquid crystalline esters. We investigated several intermediates using structural, spectroscopic, and kinetic methods.
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Affiliation(s)
- Bryan Ringstrand
- Organic Materials Research Group, Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States
| | - Piotr Kaszynski
- Organic Materials Research Group, Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, United States
- Faculty of Chemistry, University of Łódź, Tamka 12, 91403 Łódź, Poland
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Bragin VI, Korlyukov AA, Petrovskii PV, Sivaev IB, Bregadze VI. Synthesis and structure of fluorophenyl derivatives of the 10-vertex monocarbaborane anions [1-CB9H10]− and [2-CB9H10]−. J Fluor Chem 2012. [DOI: 10.1016/j.jfluchem.2012.06.019] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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25
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Himmelspach A, Reiss GJ, Finze M. Microwave-Assisted Kumada-Type Cross-Coupling Reactions of Iodinated Carba-closo-dodecaborate Anions. Inorg Chem 2012; 51:2679-88. [DOI: 10.1021/ic202638k] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Alexander Himmelspach
- Institut für Anorganische
Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Guido J. Reiss
- Institut für Anorganische
Chemie und Strukturchemie II, Heinrich-Heine-Universität Düsseldorf, Universitätsstrasse 1, 40225
Düsseldorf, Germany
| | - Maik Finze
- Institut für Anorganische
Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
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Ethynylmonocarba-closo-dodecaborates: M[12-HCC-closo-1-CB11H11] and M[7,12-(HCC)2-closo-1-CB11H10] (M=Cs+, [Et4N]+). J Organomet Chem 2010. [DOI: 10.1016/j.jorganchem.2010.02.011] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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28
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Ringstrand B, Kaszynski P, Young VG, Janousek Z. Anionic amino acid [closo-1-CB9H8-1-COO-10-NH3]- and dinitrogen acid [closo-1-CB9H8-1-COOH-10-N2] as key precursors to advanced materials: synthesis and reactivity. Inorg Chem 2010; 49:1166-79. [PMID: 20043626 DOI: 10.1021/ic9021323] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Amino acid [closo-1-CB(9)H(8)-1-COO-10-NH(3)](-) (4) was prepared by amination of iodo acid [closo-1-CB(9)H(8)-1-COOH-10-I](-) (1) with LiHMDS in a practical and reproducible manner. The apparent dissociation constants, pK(2) = 5.6 and pK(1) > 11, were measured for 4[NMe(4)] in 50% aq. EtOH. Diazotization of 4 with NO(+)PF(6)(-) under mildly basic conditions afforded stable dinitrogen acid [closo-1-CB(9)H(8)-1-COOH-10-N(2)] (5). Activation parameters (DeltaH(++) = 33.9 +/- 1.4 kcal mol(-1) and DeltaS(++) = 10 +/- 3.5 cal mol(-1) K(-1)) for thermolysis of its methyl ester [closo-1-CB(9)H(8)-1-COOMe-10-N(2)] (11) in PhCN were established, and the heterolysis of the B-N bond is believed to be the rate-determining step. Electrochemical analysis showed a partially reversible reduction process for 11 (E(1/2)(red) = -1.03 V) and 5(-) (E(1/2)(red) = -1.21 V), which are more cathodic than reduction of [closo-1-CB(9)H(9)-1-N(2)] (17). The dinitrogen acid 5 was reacted with pyridine and N,N-dimethylthioformamide, to form pyridine acid 6 and protected mercapto acid 7, respectively, through a boronium ylide intermediate 18. Compound 7 was converted to sulfonium acid 8. The molecular and crystal structures for 5 [C(2)H(9)B(9)N(2)O(2) monoclinic, P2(1)/n, a = 7.022(2) A, b = 11.389(4) A, c = 12.815(4) A, beta = 96.212(5) degrees ; V = 1018.8(6) A(3), Z = 4,], 6 [C(7)H(14)B(9)NO(2), monoclinic, P2(1)/n, a = 14.275(4) A, b = 12.184(3) A, c = 30.538(8) A, beta = 95.377(4) degrees ; V = 5288(3) A(3), Z = 16], and 8 [C(7)H(19)B(9)O(2)S, monoclinic, P2(1)/c, a = 15.988(5) A, b = 19.377(6) A, c = 9.655(3) A, beta = 98.348(5) degrees; V = 2959.4(16) A(3), Z = 8] were determined by X-ray crystallography and compared with results of density functional theory (DFT) and MP2 calculations. Electronic structures of 5, 6, and related species were elucidated with electronic spectroscopy and assessed computationally at the B3LYP/6-31G(d,p), MP2/6-31G(d,p), and ZINDO//MP2 levels of theory.
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Affiliation(s)
- Bryan Ringstrand
- Organic Materials Research Group, Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, USA
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Farràs P, Viñas C, Sillanpää R, Teixidor F, Rey M. The nature of the chlorination reaction in [1-C6H5-1-CB9H9]− boron clusters. Dalton Trans 2010; 39:7684-91. [DOI: 10.1039/c0dt00433b] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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30
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Finze M, Sprenger J. Anionic Gold(I) Complexes-Twelve- and Ten-Vertex Monocarba-closo-borate Anions with Carbon-Gold σ Bonds. Chemistry 2009; 15:9918-27. [DOI: 10.1002/chem.200901130] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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31
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Ringstrand B, Bateman D, Shoemaker RK, Janoušek Z. Improved synthesis of [closo-1-CB9H10]– anion and new C-substituted derivatives. ACTA ACUST UNITED AC 2009. [DOI: 10.1135/cccc2008151] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The Brellochs method was utilized to gain access to the [closo-1-CB9H10]– anion (1). Previous work describing the details of the synthesis of 1 via the [closo-2-CB9H10]– anion (2) was brief and insufficient. Therefore, we report an optimized procedure for the synthesis of 1, the preparation of the unknown C-halogenated series using N-halosuccinimides and bis(benzenesulfonyl)fluoroamine, and the unknown C-methylated product using CH3I. NMR properties and regularities within the series were also investigated.
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32
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Finze M. Regioselective Monoiodination of Carba-closo-dodecaborates: M[7-I-12-X-closo-CB11H10] (M = Cs+, [Et4N]+; X = F, Cl, Br, OH). Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200801046] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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33
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Franken A, McGrath TD, Stone FGA. 10-Vertex Manganese−Dicarbollide Complexes from a Monocarbon Precursor. Synthesis and Cluster Vertex Functionalization of [1-OH-2,2,2-(CO)3-closo-2,1,10-MnC2B7H8]−. Organometallics 2008. [DOI: 10.1021/om800730n] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andreas Franken
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - Thomas D. McGrath
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - F. Gordon A. Stone
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
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34
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Finze M. Synthesis and Characterization of 2-Mono- and 1,2-Diaminocarba-closo-dodecaborates M[1-R-2-H2N-closo-CB11H10] (R=H, Ph, H2N, CyHN). Chemistry 2008; 15:947-62. [DOI: 10.1002/chem.200801497] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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35
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Finze M. Carba-closo-dodecaborates with One or Two Alkynyl Substituents Bonded to Boron. Inorg Chem 2008; 47:11857-67. [PMID: 18998671 DOI: 10.1021/ic801610b] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maik Finze
- Institut für Anorganische Chemie and Strukturchemie II, Heinrich-Heine-Universität Düsseldorf, Universitätsstraβe 1, 40225 Düsseldorf, Germany
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36
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Bakardjiev M, Holub J, Hnyk D, Štíbr B. Reductive Degradation ofnido-1-CB8H12into Smaller-Cage Carborane Systems via New Monocarbaboranes [arachno-5-CB8H13]−andcloso-2-CB6H8. Chemistry 2008; 14:6529-33. [DOI: 10.1002/chem.200800233] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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37
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Franken A, McGrath TD, Stone FGA. A 10-Vertex Iron−Dicarbollide System Formed by Insertion of {Fe(CO)4} into 8-Vertex [closo-1-CB7H8]−: Synthesis and Reactivity Studies. Organometallics 2008. [DOI: 10.1021/om700865s] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andreas Franken
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - Thomas D. McGrath
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - F. Gordon A. Stone
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
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38
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Macías R, Thornton-Pett M, Holub J, Spalding TR, Faridoon Y, Štíbr B, Kennedy JD. Polyhedral metallathiaborane chemistry: Synthesis and characterisation of metallathiaboranes based on the twelve-vertex icosahedral closo-{MSB10H10} unit, where M is Rh or Ir. J Organomet Chem 2008. [DOI: 10.1016/j.jorganchem.2007.11.014] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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39
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Bould J, Laromaine A, Bullen NJ, Viñas C, Thornton-Pett M, Sillanpää R, Kivekäs R, Kennedy JD, Teixidor F. Borane reaction chemistry. Alkyne insertion reactions into boron-containing clusters. Products from the thermolysis of [6,9-(2-HCC–C5H4N)2-arachno-B10H12]. Dalton Trans 2008:1552-63. [DOI: 10.1039/b715845a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Molinos E, Brayshaw SK, Kociok-Köhn G, Weller AS. Sequential Dehydrogenative Borylation/Hydrogenation Route to Polyethyl-Substituted, Weakly Coordinating Carborane Anions. Organometallics 2007. [DOI: 10.1021/om070043p] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Eduardo Molinos
- Department of Chemistry, University of Bath, Bath BA2 7AY, U.K
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41
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Körbe S, Schreiber PJ, Michl J. Chemistry of the Carba-closo-dodecaborate(−) Anion, CB11H12-. Chem Rev 2006; 106:5208-49. [PMID: 17165686 DOI: 10.1021/cr050548u] [Citation(s) in RCA: 218] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Stefanie Körbe
- Institute of Organic Chemistry and Biochemistry, Academy of Science of the Czech Republic, 16610 Prague, Czech Republic
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42
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McGrath TD, Du S, Hodson BE, Stone FGA. Construction of Metal Butterflies on a Metallacarborane Scaffold. 2. Synthesis and Structures of Hetero-tri- and -tetrametallic Clusters. Organometallics 2006. [DOI: 10.1021/om060418r] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas D. McGrath
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - Shaowu Du
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - Bruce E. Hodson
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - F. Gordon A. Stone
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
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43
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McGrath TD, Du S, Hodson BE, Lu XL, Stone FGA. Construction of Metal Butterflies on a Metallacarborane Scaffold. 1. Synthesis and Structures of Bimetallic Precursors. Organometallics 2006. [DOI: 10.1021/om060417z] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Thomas D. McGrath
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - Shaowu Du
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - Bruce E. Hodson
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - Xiu Lian Lu
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - F. Gordon A. Stone
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
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44
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Lu XL, McGrath TD, Stone FGA. Synthesis and Reactivity of 10- and 12-Vertex Cobalt−Monocarborane Anions Containing Multiple Metal Centers. Organometallics 2006. [DOI: 10.1021/om060123d] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xiu Lian Lu
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - Thomas D. McGrath
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - F. Gordon A. Stone
- Department of Chemistry & Biochemistry, Baylor University, Waco, Texas 76798-7348
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45
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Franken A, McGrath TD, Stone FGA. Ten-vertex iron-monocarbollide complexes: synthesis and reactivity of the anion [4,9-{Fe(CO)4}-9,9,9-(CO)3-arachno-9,6-FeCB8H11]-. Inorg Chem 2006; 45:2669-77. [PMID: 16529490 DOI: 10.1021/ic051946i] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reagent [arachno-4-CB8H14] reacts with [Fe3(CO)12] in tetrahydrofuran (THF) at reflux temperatures, followed by addition of [N(PPh3)2]Cl, to afford [N(PPh3)2][4,9-{Fe(CO)4}-9,9,9-(CO)3-arachno-9,6-FeCB8H11] (3). In the anion of 3, one iron atom is part of the open CBBFeBB face of a 10-vertex {arachno-9,6-FeCB8} cage, to which the second iron atom is attached via an Fe-Fe bond and an additional exo-polyhedral Fe-B sigma bond. Upon heating 3 in refluxing toluene, the closed 10-vertex species [N(PPh3)2][2,2,2-(CO)3-closo-2,1-FeCB8H9] (4) is obtained, whereas the isomeric compound [N(PPh3)2][6,6,6-(CO)3-closo-6,1-FeCB8H9] (5) is isolated upon heating [closo-4-CB8H9]- and [Fe3(CO)12] in refluxing THF with subsequent addition of [N(PPh3)2]Cl. Protonation of 3 using CF3SO3H in CH2Cl2 gives the charge-compensated compound [4,9-{Fe(CO)4}-4-(mu-H)-9,9,9-(CO)3-arachno-9,6-FeCB8H11] (6), in which the B-Fe sigma bond of the precursor has been converted to a B-H right harpoon-up Fe linkage. In contrast, 3 with {M(PPh3)}+ gives the trimetallic species [1,3,4,9-{MFe(CO)4(PPh3)}-1,3-(mu-H)2-9,9,9-(CO)3-arachno-9,6-FeCB8H9] (M = Cu (7), Ag 8) in which the three metal centers form a V-shaped M-Fe-Fe unit. Compound 6 reacts with PEt3 in the presence of Me(3)NO to yield [4,9-(PEt3)2-9,9-(CO)2-nido-9,6-FeCB8H10] (9). In the latter, the formerly exo-polyhedral {Fe(CO)4} fragment has been replaced by a PEt3 ligand, with a second PEt3 substituting one CO group at the remaining cluster iron vertex. The novel structural features of compounds 3-9 have been confirmed by single-crystal X-ray diffraction studies.
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Affiliation(s)
- Andreas Franken
- Department of Chemistry and Biochemistry, Baylor University Waco, Texas 76798-7348, USA
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46
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Lei P, McGrath TD, Stone FGA. Oxidation of the Bis-molybdenum(0) Trianion [1,3,6-{Mo(CO)3}-3,6-(μ-H)2-1,1,1-(CO)3-2-Ph-closo-1,2-MoCB9H7]3-: Metal and Boron Vertex Substitution and Cluster Expansion. Organometallics 2006. [DOI: 10.1021/om0600543] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Peng Lei
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - Thomas D. McGrath
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798-7348
| | - F. Gordon A. Stone
- Department of Chemistry and Biochemistry, Baylor University, Waco, Texas 76798-7348
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47
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Franken A, Jelínek T, Taylor RG, Ormsby DL, Kilner CA, Clegg W, Kennedy JD. Polyhedral monocarbaborane chemistry. Some C-phenylated seven, eight, nine, ten, eleven and twelve-vertex species. Dalton Trans 2006:5753-69. [PMID: 17146540 DOI: 10.1039/b609908d] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Some synthetic and structural systematics for monocarbaboranes, using the C-phenylated motif as the example, are investigated. The 10-vertex [6-Ph-nido-6-CB(9)H(11)](-) anion 1, from reaction of PhCHO with B(10)H(14) in KOH/H(2)O, is a useful entry synthon into C-phenyl monocarbaborane chemistry. Treatment of anion 1 with Na/thf yields the 10-vertex [1-Ph-closo-1-CB(9)H(9)](-) anion 2a, whereas treatment of anion 1 with iodine in alkaline solution yields the isomeric 10-vertex [2-Ph-closo-2-CB(9)H(9)](-) anion 2b, which isomerises quantitatively to 2a on heating under reflux in DME. Thermolysis of anion 1 yields the 9-vertex [4-Ph-closo-4-CB(8)H(8)](-) anion 5, whereas treatment of anion 1 with FeCl(3)/HCl gives neutral 9-vertex [4-Ph-arachno-4-CB(8)H(13)] 3. Compound 3 gives neutral 9-vertex [1-Ph-nido-1-CB(8)H(11)] 4 in refluxing toluene, and gives the 7-vertex [2-Ph-closo-2-CB(6)H(6)](-) anion 7 and the 8-vertex [1-Ph-closo-1-CB(7)H(7)](-) anion 6 in refluxing toluene with NEt(3). Reaction of 1 with [BH(3)(thf)] yields the 11-vertex [7-Ph-nido-7-CB(10)H(12)](-) anion 8 which can be converted to the 12-vertex [1-Ph-closo-1-CB(11)H(11)](-) anion 10 using [BH(3)(SMe(2))]; alternatively, anion 1 yields anion 10 directly on treatment with [BH(3)(NEt(3))]. Treatment of anion 8 with I(2)/KOH yields the 11-vertex [2-Ph-closo-2-CB(10)H(10)](-) anion 9. The structures of anions 1, 2a, 2b, 5, 6, 7, 8, 9 and 10 have been established by single-crystal X-ray diffraction analyses of their [NEt(4)](+) salts, and those of neutral 3 and 4 estimated by DFT calculations at the B3LYP/6-31G* level; similar calculations have also been applied to the new anionic closo species 2a, 2b, 5, 6, 7, 9 and 10. Crystals of the [NEt(4)](+) salt of the [2-Ph-closo-2-CB(6)H(6)](-) anion 7 required synchrotron X-radiation for sufficient diffraction intensity for molecular-structure elucidation. The syntheses are in principle generally applicable to give extensive derivative C-aryl and C-alkyl chemistries.
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Affiliation(s)
- Andreas Franken
- The School of Chemistry of the University of Leeds, Leeds, UKLS2 9JT
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Sumby CJ, Carr MJ, Franken A, Kennedy JD, Kilner CA, Hardie MJ. Crystal-packing motifs of [Ag4L4]4+ star-burst tetrahedra. NEW J CHEM 2006. [DOI: 10.1039/b609356f] [Citation(s) in RCA: 29] [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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Belen’kii L, Gramenitskaya V, Evdokimenkova Y. The Literature of Heterocyclic Chemistry, Part IX, 2002–2004. ADVANCES IN HETEROCYCLIC CHEMISTRY 2006. [DOI: 10.1016/s0065-2725(06)92004-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Ringstrand B, Balinski A, Franken A, Kaszynski P. A Practical Synthesis of Isomerically Pure 1,10-Difunctionalized Derivatives of the [closo-1-CB9H10] Anion. Inorg Chem 2005; 44:9561-6. [PMID: 16323945 DOI: 10.1021/ic051311j] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The isomer-free [closo-1-CB9H(8)-1-COOH-10-I]- anion was prepared in four steps and 10% overall yield from B10H14. The key step is the skeletal isomerization of the [closo-2-CB9H8-2-COOH-7-I]- anion to a mixture of the 10- and 6-iodo derivatives of [closo-1-CB9H(9)-1-COOH]- formed in up to a 3:1 ratio. The carboxylic acid 4 was converted to the amine [closo-1-CB9H(8)-1-NH(2)-10-I]- using the Curtius reaction. The relative thermodynamic stability of each product was calculated at the DFT and MP2 levels of theory. The regioselectivity of electrophilic substitution in [closo-CB9H10]- derivatives was briefly investigated using the NBO population analysis of the MP2 wave function.
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Affiliation(s)
- Bryan Ringstrand
- Organic Materials Research Group, Department of Chemistry, Vanderbilt University, Nashville, Tennessee 37235, USA
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