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Sietzen M, Batke S, Antoni PW, Wadepohl H, Ballmann J. Benzylene-linked [PNP] scaffolds and their cyclometalated zirconium and hafnium complexes. Dalton Trans 2017; 46:5816-5834. [PMID: 28401977 DOI: 10.1039/c7dt00413c] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
The benzylene-linked [PNP] scaffolds HN(CH2-o-C6H4PPh2)2 ([A]H) and HN(C6H4-o-CH2PPh2)2 ([B]H) have been used for the synthesis of zirconium and hafnium complexes. For both ligands, the dimethylamides [A]M(NMe2)3 ([A]1-M) and [B]M(NMe2)3 ([B]1-M) were prepared and converted to the iodides [A]MI3 ([A]2-M) and [B]MI3 ([B]2-M) (M = Zr, Hf). Starting from these iodides, the corresponding benzyl derivatives [A]MBn3 ([A]3-M) and [B]MBn3 ([B]3-M) (M = Zr, Hf) were obtained via reaction with Bn2Mg(OEt2)2. For zirconium, the benzylic ligand positions in [A]3-Zr and [B]3-Zr were found to cyclometalate readily, which led to the corresponding κ4-[PCNP]ZrBn2 complexes [A]4-Zr and [B]4-Zr. As these complexes failed to hydrogenate cleanly, cyclometalated derivatives with only one alkyl substituent were targeted and the mixed benzyl chlorides κ4-[PCNP]MBnCl ([B]5-M, M = Zr, Hf) were obtained in the case of ligand [B]. Upon hydrogenation of [B]5-Zr, the η6-tolyl complex [B]Zr(η6-C7H8)Cl ([B]6-Zr) was generated cleanly, but the corresponding hafnium complex [B]5-Hf was found to decompose unselectively in the presence of H2. Using a closely related carbazole-based [PNP] ligand, Gade and co-workers have shown recently that zirconium η6-arene complexes similar to [B]6-Zr may serve as zirconium(ii) synthons, namely when reacted with 2,6-Dipp-NC (L) or pyridine (py). Both these substrates were shown to react cleanly with [B]6-Zr, which led to the formation of the bis-isocyanide complex [B]ZrCl(L)2 ([B]7-Zr) and the 2,2'-bipyridine derivative [B]ZrCl(bipy) ([B]8-Zr), respectively. Upon reaction of [B]Zr(η6-C7H8)Cl ([B]6-Zr) with NaBEt3H, the cyclometalated derivative κ4-[PCNP]Zr(η6-C7H8) ([B]9-Zr) was isolated. In an attempt to synthesise terminal hydrides, complexes [A]MI3 ([A]2-M) were treated with KBEt3H, which led to the isolation of the cyclometalated hydrido complexes κ4-[PCNP]M(H)(κ3-Et3BH) ([A]10-M; M = Zr, Hf) featuring a κ3-bound triethyl borohydride moiety.
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Affiliation(s)
- Malte Sietzen
- Anorganisch-Chemisches Institut, Ruprecht-Karls-Universität Heidelberg, Im Neuenheimer Feld 276, 69120 Heidelberg, Germany.
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Pospiech S, Bolte M, Lerner HW, Wagner M. Diborylated magnesium anthracene as precursor for B2H5(-)-bridged 9,10-dihydroanthracene. Chemistry 2015; 21:8229-36. [PMID: 25892077 DOI: 10.1002/chem.201500541] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Indexed: 11/10/2022]
Abstract
9,10-(Bpin)2-anthracene (3, HBpin = pinacolborane) was synthesized from 9,10-dibromoanthracene in a stepwise lithiation/borylation sequence. The reaction of 3 with highly activated magnesium furnished the diborylated magnesium anthracene 4, which was quenched in situ with ethereal HCl to yield cis-9,10-(Bpin)2-DHA (cis-5, DHA = 9,10-dihydroanthracene). Compound cis-5, in turn, can be reduced with Li[AlH4] in THF to give its diborate Li2[cis-9,10-(BH3)2-DHA] (Li2 [cis-6]). In the crystal lattice, the THF solvate Li2[cis-6]⋅3 THF establishes a dimeric structure with Li-(μ-H)-B coordination modes. Hydride abstraction from Li2[cis-6] with Me3SiCl yields the B-H-B-bridged DHA Li[7]. This product can also be viewed as a unique cyclic B2H7(-) derivative with a hydrocarbon backbone. Treatment of Li2[cis-6] with the stronger hydride abstracting agent Me3SiOTf (HOTf = trifluoromethanesulfonic acid) in THF affords the THF diadduct of cis-9,10-(BH(OTf))2-DHA.
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Affiliation(s)
- Steffen Pospiech
- J. W. Goethe-Universität, Institut für Anorganische und Analytische Chemie, Max-von-Laue-Straße 7, 60438 Frankfurt (Main) (Germany), Fax: (+49) 69-798-29260
| | - Michael Bolte
- J. W. Goethe-Universität, Institut für Anorganische und Analytische Chemie, Max-von-Laue-Straße 7, 60438 Frankfurt (Main) (Germany), Fax: (+49) 69-798-29260
| | - Hans-Wolfram Lerner
- J. W. Goethe-Universität, Institut für Anorganische und Analytische Chemie, Max-von-Laue-Straße 7, 60438 Frankfurt (Main) (Germany), Fax: (+49) 69-798-29260
| | - Matthias Wagner
- J. W. Goethe-Universität, Institut für Anorganische und Analytische Chemie, Max-von-Laue-Straße 7, 60438 Frankfurt (Main) (Germany), Fax: (+49) 69-798-29260.
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Yan K, Duchimaza Heredia JJ, Ellern A, Gordon MS, Sadow AD. Lewis Base Mediated β-Elimination and Lewis Acid Mediated Insertion Reactions of Disilazido Zirconium Compounds. J Am Chem Soc 2013; 135:15225-37. [DOI: 10.1021/ja407950e] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- KaKing Yan
- Department of
Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | | | - Arkady Ellern
- Department of
Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Mark S. Gordon
- Department of
Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
| | - Aaron D. Sadow
- Department of
Chemistry, Iowa State University, 1605 Gilman Hall, Ames, Iowa 50011, United States
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Reichert A, Bolte M, Lerner HW, Wagner M. Ferrocenyl(trihydro)borates: building blocks for the synthesis of heterooligonuclear metallocene complexes. Dalton Trans 2013; 42:688-94. [PMID: 22992660 DOI: 10.1039/c2dt31732j] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Adelina Reichert
- Institut für Anorganische Chemie, J. W. Goethe-Universität Frankfurt, Max-von-Laue-Strasse 7, D-60438 Frankfurt (Main), Germany
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Bera B, Patil YP, Nethaji M, Jagirdar BR. A homobimetallic complex of chromium(0) with a σ-borane component. Dalton Trans 2011; 40:10592-7. [PMID: 21755086 DOI: 10.1039/c1dt10584a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis, characterization, and reactivity of a chromium(0) complex bearing an amine-borane moiety (η(6)-C(6)H(5)CH(2)NMe(2)·BH(3))Cr(CO)(3) (2) is reported. Photolysis of complex 2 results in the elimination of a CO ligand followed by the formation of an intramolecular σ-borane complex (η(1)-(η(6)-C(6)H(5)CH(2)NMe(2)·BH(2)-H))Cr(CO)(2) (3). This species was characterized in solution by NMR spectroscopy. Reaction of complex 2 with photochemically generated (OC)(5)Cr(THF) affords a novel homobimetallic σ-borane complex (OC)(3)Cr(η(6)-C(6)H(5)CH(2)NMe(2)·BH(2)-H-Cr(CO)(5)) (4), wherein one of the BH moieties is bound to the chromium center in an η(1)-fashion. The σ-borane complex 4 was isolated in moderate to good yield (72%). The BH(3) fragment in the complexes 3 and 4 are highly dynamic involving exchange of the BH hydrogen bound to the metal with the terminal BH hydrogen atoms. The dynamics has been studied using variable-temperature NMR spectroscopy. Complexes 2 and 4 have been characterized by X-ray crystallography.
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Affiliation(s)
- Barun Bera
- Department of Inorganic & Physical Chemistry, Indian Institute of Science, Bangalore, 560012, India
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Liu FC, Yang CC, Chen SC, Lee GH, Peng SM. Novel μ3-oxo complexes prepared from Cp*Zr(BH3R)3 (R = H, CH3) and B(C6F5)3 in diethyl ether. Dalton Trans 2008:3599-604. [DOI: 10.1039/b719863a] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chen X, Liu S, Du B, Meyers EA, Shore SG. The Structure of Potassium and Tetramethylammonium Salts of the Cyclic Organohydroborate Anion [H
2
BC
8
H
14
]
–
with Different Solvent Ligands. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200700836] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Xuenian Chen
- Department of Chemistry, the Ohio State University, 100W 18th Ave, Columbus, OH 43210, USA, Fax: +1‐614‐292‐1685
| | - Shengming Liu
- Department of Chemistry, the Ohio State University, 100W 18th Ave, Columbus, OH 43210, USA, Fax: +1‐614‐292‐1685
| | - Bin Du
- Department of Chemistry, the Ohio State University, 100W 18th Ave, Columbus, OH 43210, USA, Fax: +1‐614‐292‐1685
| | - Edward A. Meyers
- Department of Chemistry, the Ohio State University, 100W 18th Ave, Columbus, OH 43210, USA, Fax: +1‐614‐292‐1685
| | - Sheldon G. Shore
- Department of Chemistry, the Ohio State University, 100W 18th Ave, Columbus, OH 43210, USA, Fax: +1‐614‐292‐1685
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Braunschweig H, D'Andola G, Welton T, White AJP. Synthesis and Structure of Novel Organocycloborates. Chemistry 2006; 12:600-6. [PMID: 16273562 DOI: 10.1002/chem.200500760] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
A series of alpha,omega-boryl(bromo)alkanes of the general formula R2B-(CH2)n-Br (n = 3, 4, 5, 6) was obtained in high yield following a standard hydroboration protocol. Upon treatment with Mg turnings and formation of the respective Grignard species, all alkanes with n = 4 to 6 underwent an unprecedented boron-centered cyclisation reaction with formation of boratacyclopentanes, -hexanes, and -heptanes, respectively. All new compounds were isolated in high yields as colourless, crystalline materials and characterised in solution by multinuclear NMR spectroscopy. Four representative examples were chosen for X-ray diffraction studies, thus providing the first structurally characterised ring systems of that size at a tetraalkyl borate centre.
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Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Bayerische Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
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Synthesis and Molecular Structure of Novel Cyclic Organohydroborate Hafnocene Complex (η 5-C 5H 5) 2Hf{(μ-H) 2BC 8H 14\} 2. B KOREAN CHEM SOC 2005. [DOI: 10.5012/bkcs.2005.26.9.1447] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Chen X, Lim S, Plecnik CE, Liu S, Du B, Meyers EA, Shore SG. Europium(II) and Ytterbium(II) Cyclic Organohydroborates with Agostic Interactions. Inorg Chem 2005; 44:6052-61. [PMID: 16097825 DOI: 10.1021/ic050573i] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The divalent lanthanide bis((cyclooctane-1,5-diyl)dihydroborate) complexes {K(THF)4}2{Ln{(mu-H)2BC8H14}4} (Ln = Eu, 3; Yb, 4) were prepared by a metathesis reaction between (THF)(x)LnCl2 and K[H2BC8H14] in THF in a 1:4 molar ratio. Although the reaction ratios were varied between 1:3 and 1:6, complexes 3 and 4 were the only lanthanide 9-BBN hydroborates produced. Because of disorder of THF in crystals of 3 and 4, good single-crystal X-ray structural data could not be obtained. However, when the potassium cation was replaced by the tetramethylammonium cation or when MeTHF (2-methyltetrahydrofuran) was employed in place of THF, good quality crystals were obtained. Complexes [NMe4]2[Ln{(mu-H)2BC8H14}4] (Ln = Eu, 5; Yb, 6) were afforded by metathesis reactions of NMe4Cl with 3 and 4 in situ. On the basis of the single-crystal X-ray diffraction analysis, the four 9-BBN tetrahydroborate ligands are tetrahedrally arranged around the lanthanide cation in 5 and 6. The two structures differ in that one alpha-C-H bond from each of the four {(mu-H)2BC8H14}4 units exhibits an agostic interaction with Eu(II) in 5 but, in complex 6, only two of the alpha-C-H bonds form agostic interactions with Yb(II). Complexes {K(MeTHF)3}2{Ln{(mu-H)2BC8H14}4} (Ln = Eu, 7; Yb, 8) were produced by employing MeTHF in place of THF. The structures of 7 and 8 display connectivity between the anion {Ln{(mu-H)2BC8H14}4}2- and the cation {K(MeTHF)3}+, in which the potassium not only interacts directly with the hydrogens of the Ln-H-B bridged bonds but is also involved in agostic interactions with alpha-C-H bonds. By systematically examining the structures of complexes 3-8 and taking into account the previously reported complexes (THF)4Ln{(mu-H)2BC8H14}2 (Ln = Eu, 1; Yb, 2), it is concluded that Eu(II) appears to have a better ability to form agostic interactions than Yb(II) because of its larger size, even though Yb(II) has a higher positive charge density.
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Affiliation(s)
- Xuenian Chen
- Department of Chemistry, Ohio State University, Columbus, Ohio 43210, USA
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Ding E, Du B, Liu FC, Liu S, Meyers EA, Shore SG. Preparation and crystal structures of a series of titanium(III) 9-BBN hydroborate complexes containing Ti...H agostic interactions. Inorg Chem 2005; 44:4871-8. [PMID: 15962996 DOI: 10.1021/ic050422f] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
9-BBN hydroborate complexes Ti{(mu-H)2BC8H14}3(THF)2 (1), Ti{(mu-H)2BC8H14}3(OEt2) (2), and [K(OEt2)4]-[Ti{(mu-H)2BC8H14}4] (4) were formed from the reaction of TiCl4 with K[H2BC8H14] in diethyl ether or THF. Ti{(mu-H)2BC8H14}3(PhNH2) (3) was isolated from the reaction of 2 with aniline in diethyl ether. In the formation of these complexes, Ti(IV) is reduced to Ti(III). The coordinated diethyl ether in 2 can be displaced by the stronger bases THF and aniline, to form 1 and 3, respectively. All of the compounds were characterized by single-crystal X-ray diffraction analysis. In complex 1, which contains two coordinated THF ligands, the titanium possesses a 17 electron configuration and there is no evidence for agostic interaction. Complexes 2 and 3 contain only one coordinated ether or aniline ligand, and the titanium possesses a 15 electron configuration. In these compounds, a C-H hydrogen on an alpha carbon on the BC8H14 unit of a 9-BBN hydroborate ligand forms an agostic interaction with the titanium. Criteria for assessing the existence of agostic interactions are discussed. As the potassium salt, the anion of complex 4 is more stable than the complexes 1-3. Organometallic anions of the type [ML4]- for titanium(III) are rare.
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Affiliation(s)
- Errun Ding
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, USA
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Synthesis and Molecular Structure of Novel Organohydroborate Zirconocene Complex [(η 5-C 5H 5) 2Zr(μ-H)(μ-O)(BC 8H 14)] 2. B KOREAN CHEM SOC 2005. [DOI: 10.5012/bkcs.2005.26.5.707] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Ding E, Du B, Meyers EA, Shore SG, Yousufuddin M, Bau R, McIntyre GJ. Synthesis and X-ray and Neutron Structures of Zr{(μ-H)2BC8H14}4. Inorg Chem 2005; 44:2459-64. [PMID: 15792484 DOI: 10.1021/ic048629g] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The complex Zr(9-BBN)4 [9-BBN = (mu-H)2BC8H14] has been synthesized via the reaction of K(9-BBN) with ZrCl4 in diethyl ether. The structure of the title compound has been determined by X-ray and neutron single-crystal diffraction techniques. Each 9-BBN ligand is coordinated to the Zr atom via two B-H-Zr bridges, and these metal-ligand bonding interactions are further augmented by three prominent C-H...Zr agostic interactions. Average molecular parameters derived from the neutron analysis: Zr-H = 2.051(8) A, B-H = 1.286(7) A, Zr...B = 2.409(6) A, Zr-H-B = 87.7(4) degrees , H-Zr-H = 58.9(3) degrees . The Zr...H distances corresponding to the three C-H...Zr agostic interactions are 2.424(7), 2.663(8), and 2.551(7) A. The fourth potential C-H...Zr interaction has a Zr...H distance [3.146(7) A] that is too long to be considered in the agostic range. Single-crystal X-ray diffraction data were collected on an Enraf-Nonius Kappa CCD diffraction system, and neutron diffraction data were collected on the quasi-Laue diffractometer VIVALDI at the Institut Laue-Langevin; the final agreement factor for the neutron analysis is 6.52% for 2557 reflections with I > 2sigma(I).
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Affiliation(s)
- Errun Ding
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, USA
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Ariafard A, Amini MM, Azadmehr A. Density functional theory study on structural isomers and bonding of model complexes M(CO)5(BH3·PH3) (M=Cr, Mo, W) and W(CO)5(BH3·AH3) (A=N, P, As, Sb). J Organomet Chem 2005. [DOI: 10.1016/j.jorganchem.2004.11.021] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
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Chen X, Liu FC, Plečnik CE, Liu S, Du B, Meyers EA, Shore SG. Effect of Solvent in the Reaction of Cp2ZrH{(μ-H)2BR2} (R2 = C4H8, C8H14) with B(C6F5)3: Formation of [HB(C6F5)3]- Salts of the Unsupported Hydrogen-Bridged Cations [(μ-H){Cp2Zr(μ-H)2BR2}2]+ (R2 = C4H8, C8H14) and [Cp2Zr(OEt2)X]+ (X = OEt, {(μ-H)2BC8H14}). Organometallics 2004. [DOI: 10.1021/om030692a] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Xuenian Chen
- Evans Laboratory, Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Fu-Chen Liu
- Evans Laboratory, Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Christine E. Plečnik
- Evans Laboratory, Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Shengming Liu
- Evans Laboratory, Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Bin Du
- Evans Laboratory, Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Edward A. Meyers
- Evans Laboratory, Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Sheldon G. Shore
- Evans Laboratory, Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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Lacroix F, Plecnik CE, Liu S, Liu FC, Meyers EA, Shore SG. Cyclic organohydroborate complexes of metallocenes. J Organomet Chem 2003. [DOI: 10.1016/j.jorganchem.2003.08.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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18
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Shen H, Jordan RF. Molecular Structure and Vinyl Chloride Insertion of a Cationic Zirconium(IV) Acyl Carbonyl Complex. Organometallics 2003. [DOI: 10.1021/om0210311] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Han Shen
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
| | - Richard F. Jordan
- Department of Chemistry, The University of Chicago, 5735 South Ellis Avenue, Chicago, Illinois 60637
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Liu FC, Chen KY, Chen JH, Lee GH, Peng SM. Syntheses and structures of metallocene methyltrihydroborate derivativies: Cp2ZrCl[(mu-H)2BHCH3], Cp2Zr[(mu-H)2BHCH3]2, and Cp2Ti[(mu-H)2BHCH3]. Inorg Chem 2003; 42:1758-63. [PMID: 12611550 DOI: 10.1021/ic020597e] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
In reactions of zirconocene dichloride, Cp(2)ZrCl(2), with 1 equiv and an excess amount of LiBH(3)CH(3), the methyltrihydroborate complexes, Cp(2)ZrCl[(mu-H)(2)BHCH(3)], 1, and Cp(2)Zr[(mu-H)(2)BHCH(3)](2), 2, were isolated. The reaction of titanocene dichloride, Cp(2)TiCl(2), with an excess amount of LiBH(3)CH(3) produced the monosubstituted methyltrihydroborate complex, Cp(2)Ti[(mu-H)(2)BHCH(3)], 3. The titanium was reduced from Ti(IV) to Ti(III), producing a 17-electron, paramagnetic titanocene complex. Under a dynamic vacuum at room temperature, compound 2 decomposed and produced the zirconium hydride compound Cp(2)ZrH[(mu-H)(2)BHCH(3)]. Single crystal X-ray structures of 1, 2, and 3 were determined. Crystal data for 1: space group P2(1)/c, a = 13.7921(3) A, b = 13.4227(3) A, c = 13.0868(3) A, beta = 91.6448(12) degrees, Z = 8. Crystal data for 2: space group Pna2(1), a = 15.2949(4) A, b = 9.3417(2) A, c = 9.3211(2) A, Z = 4. Crystal data for 3: space group Fmm2, a = 9.1795(3) A, b = 13.0993(5) A, c = 8.8520(3) A, Z = 4.
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Affiliation(s)
- Fu-Chen Liu
- Department of Chemistry, National Dong Hwa University, Hualien 974, Taiwan, ROC.
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Ding E, Liu FC, Liu S, Meyers EA, Shore SG. Synthesis, structural characterization, and reactions of cyclic organohydroborate half-zirconocene compounds. Inorg Chem 2002; 41:5329-35. [PMID: 12377026 DOI: 10.1021/ic0202817] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Cyclic organohydroborate complexes of zirconium monocyclopentadienyl CpZr[(mu-H)(2)BC(5)H(10)](3), 1, and CpZr[(mu-H)(2)BC(8)H(14)](3), 2, were prepared from the reaction of CpZrCl(3) with 3 mol of K[H(2)BC(5)H(10)] and K[H(2)BC(8)H(10)], respectively, in diethyl ether. Compounds 1 and 2 react with the hydride ion abstracting agent B(C(6)F(5))(3) to form the same salt [CpZr(OEt)(OEt(2))(mu-OEt)](2)[HB(C(6)F(5))(3)](2), 5. The complexes CpZr(Cl)[(mu-H)(2)BC(8)H(14)](2), 3, and CpZr(Cl)[(mu-H)(2)BC(8)H(14)](2) [where Cp = C(5)(CH(3))(5)], 4, were prepared from the reaction of CpZrCl(3) and CpZrCl(3) with K[H(2)BC(8)H(10)] in 1:2 molar ratios, respectively. An alpha-hydrogen of a BC(8)H(14) unit forms an agostic interaction with Zr in compound 3 but not in 4. All of the compounds were characterized by single-crystal X-ray diffraction analysis.
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Affiliation(s)
- Errun Ding
- Department of Chemistry, The Ohio State University, Columbus, OH 43210, USA
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Thomas RL, Rath NP, Barton L. Formation of metallaboranes from the group IV transition metals and pentaborane(9): crystal and molecular structure of [(Cp(2)Zr)(2)B(5)H(8)][B(11)H(14)]. Inorg Chem 2002; 41:67-75. [PMID: 11782145 DOI: 10.1021/ic010665h] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The reactions between [(C(5)H(5))(2)MCl(2)] (where M = Ti, Zr, Hf) and Li[B(5)H(8)] in a variety of solvents have been investigated. In the case of Zr, a pale orange solid, mu-(Cp(2)ClZr)B(5)H(8) (1), is formed in 70% yield. Compound 1 exists as a B(5)H(9) cage with a Cp(2)ClZr moiety replacing a bridging H atom. The variable temperature NMR spectra of 1 reveal two fluxional processes, one (DeltaG(++) = 54 kJ mol(-1)) which renders a plane of symmetry in the molecule and a higher temperature one (DeltaG(++) = 48 kJ mol(-1)) which renders all the basal B atoms equivalent. Dynamic processes are suggested to account for these observations. Passage of a CH(2)Cl(2) solution of 1 through silica gel affords 2, [(Cp(2)Zr)(2)B(5)H(8)][B(11)H(14)], a yellow, air-stable, crystalline solid, in 14% yield. The cation in 2, [(Cp(2)Zr)(2)B(5)H(8)](+), consists of a distorted spiro[2.2]pentane-like B(5) moiety comprising two B(3) triangles sharing a naked boron vertex. The two triangles are twisted 73 degrees with respect to each other, and the two [Cp(2)Zr] groups bond in a trihapto arrangement to the two opposite B-B-B edges. Each exterior B-Zr edge is H-bridged, and the B atoms possess terminal hydrogens. Reactions of Cp(2)HfCl(2) with Li[B(5)H(8)] lead to the formation of the analogue of 2, [(Cp(2)Hf)(2)B(5)H(8)][B(11)H(14)] (3). The precursor to 3, that is, the Hf analogue of 1, is not observed. Reaction between Li[B(5)H(8)] and Cp(2)TiCl(2) afforded no identifiable products, but reaction with CpTiCl(3) resulted in cage coupling and the formation of B(10)H(14).
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Affiliation(s)
- Rhodri Ll Thomas
- Department of Chemistry, University of Missouri--St. Louis, St. Louis, Missouri 63121, USA
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Plečnik CE, Liu FC, Liu S, Liu J, Meyers EA, Shore SG. Hydride Ion Abstraction from Titanocene Cyclic Organohydroborates, Cp2Ti{(μ-H)2BR2} (R2 = C4H8, C5H10, C8H14), as a Function of Solvent. Organometallics 2001. [DOI: 10.1021/om010267m] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
| | - Fu-Chen Liu
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Shengming Liu
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Jianping Liu
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Edward A. Meyers
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
| | - Sheldon G. Shore
- Department of Chemistry, The Ohio State University, Columbus, Ohio 43210
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Liu FC, Plečnik CE, Liu S, Liu J, Meyers EA, Shore SG. Cyclic organohydroborate complexes of metallocenes. J Organomet Chem 2001. [DOI: 10.1016/s0022-328x(01)00727-6] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Antiñolo A, Carrillo-Hermosilla F, Fernández-Baeza J, García-Yuste S, Otero A, Rodríguez AM, Sánchez-Prada J, Villaseñor E, Gelabert R, Moreno M, Lluch JM, Lledós A. Structure and Dynamics of [Nb(η5-C5H4SiMe3)2(η2-H2BR2)] (R2 = O2C6H4, C8H14, H2) Complexes. A Combined Experimental and Theoretical Study. Organometallics 2000. [DOI: 10.1021/om000221d] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Antonio Antiñolo
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Fernando Carrillo-Hermosilla
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Juan Fernández-Baeza
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Santiago García-Yuste
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Antonio Otero
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Ana María Rodríguez
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Javier Sánchez-Prada
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Elena Villaseñor
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Ricard Gelabert
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Miquel Moreno
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - José M. Lluch
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
| | - Agustí Lledós
- Departamento de Química Inorgánica, Orgánica y Bioquímica, Facultad de Ciencias Químicas, Universidad de Castilla-La Mancha, Campus Universitario de Ciudad Real, 13071-Ciudad Real, Spain, and Departament de Química, Universitat Autònoma de Barcelona, 08193 Bellaterra, Barcelona, Spain
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Liu FC, Liu J, Meyers EA, Shore SG. The Effect of Solvent in the Reaction of Cp2ZrH{(μ-H)2BC4H8} with B(C6F5)3: Formation of [HB(C6F5)3]- Salts of the Unsupported Hydrogen-Bridged Cation [(μ-H){Cp2Zr(μ-H)2BC4H8}2]+ and the Cation [Cp2Zr(OEt2)(OEt)]+. J Am Chem Soc 2000. [DOI: 10.1021/ja001056w] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Fu-Chen Liu
- Department of Chemistry The Ohio State University Columbus, Ohio 43210
| | - Jianping Liu
- Department of Chemistry The Ohio State University Columbus, Ohio 43210
| | - Edward A. Meyers
- Department of Chemistry The Ohio State University Columbus, Ohio 43210
| | - Sheldon G. Shore
- Department of Chemistry The Ohio State University Columbus, Ohio 43210
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Liu FC, Du B, Liu J, Meyers EA, Shore SG. Cyclic Hydroborate Complexes of Metallocenes. V. Syntheses and Structures of Zirconocene Organoborate Derivatives: Cp2ZrH{(μ-H)2BC4H8}, Cp2Zr(CH2Ph){(μ-H)2BC4H8}, and Cp2Zr(CH2Ph){(μ-H)2BC5H10}. Inorg Chem 1999. [DOI: 10.1021/ic990221+] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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