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Yu YD, Price JS, Romero PE, Emslie DJH. Homoleptic 1-norbornyl complexes of group 4 and manganese: synthesis, structures, volatility, and thermal stability. CAN J CHEM 2022. [DOI: 10.1139/cjc-2022-0103] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Detailed syntheses are reported for the previously reported homoleptic 1-norbornyl complexes [M(norb)4] {M = Ti (1), Zr (3), Hf (4), and Mn (5)}. These compounds were characterized by combustion elemental analysis, NMR spectroscopy, single crystal X-ray diffraction (for 1 and 3), and SQUID magnetometry (for 5). The reaction by-product [{(norb)3Ti}2(μ-O)] (2) was also spectroscopically and structurally characterized. To assess the potential viability of 1 and 3–5 as precursors for thin film deposition by CVD or ALD, their volatility and thermal stability were evaluated by sublimation, thermogravimetric analysis, and in the case of 4, bulk thermolysis.
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Affiliation(s)
- Ya-Dong Yu
- Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4M1, Canada
| | - Jeffrey S. Price
- Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4M1, Canada
| | - Patricio E. Romero
- Intel Corporation, Components Research, 2511 NW 229th Ave., Hillsboro, OR 97124, USA
| | - David J. H. Emslie
- Department of Chemistry and Chemical Biology, McMaster University, 1280 Main Street West, Hamilton, ON L8S 4M1, Canada
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2
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Ishizaka Y, Matsumoto K, Sato K, Choi JC. Multinuclear rhodium complexes supported by tetra-tert-butoxy disiloxide ligand: Synthesis, structure, and reactivity. NEW J CHEM 2022. [DOI: 10.1039/d2nj03095k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Rhodium siloxide complexes have been used as homogeneous catalysts and model compounds for silica-supported metal catalysts. However, rhodium complexes with multidentate siloxide ligands have rarely been prepared. In this study,...
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Kelly A, Franz AK. Metal-Free Synthesis of 1,3-Disiloxanediols and Aryl Siloxanols. ACS OMEGA 2019; 4:6295-6300. [PMID: 31459769 PMCID: PMC6648610 DOI: 10.1021/acsomega.9b00121] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Accepted: 03/20/2019] [Indexed: 05/28/2023]
Abstract
The first example of metal-free oxidative hydrolysis of hydrido-siloxanes is reported. Both base-catalyzed and organocatalytic hydrolysis methods are demonstrated to transform 1,3-dihydrido-disiloxanes into 1,3-disiloxanediols. The first example of a chemoselective silane hydrolysis is demonstrated.
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Boyle TJ, Sears JM, Perales D, Cramer RE, Lu P, Chan RO, Hernandez-Sanchez BA. Synthesis and Characterization of Tris(trimethylsilyl)siloxide Derivatives of Early Transition Metal Alkoxides That Thermally Convert to Varied Ceramic–Silica Architecture Materials. Inorg Chem 2018; 57:8806-8820. [PMID: 29979585 DOI: 10.1021/acs.inorgchem.8b00630] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Timothy J. Boyle
- Advanced Materials Laboratory, Sandia National Laboratories, 1001 University Boulevard, SE, Albuquerque, New Mexico 87106, United States
| | - Jeremiah M. Sears
- Advanced Materials Laboratory, Sandia National Laboratories, 1001 University Boulevard, SE, Albuquerque, New Mexico 87106, United States
| | - Diana Perales
- Advanced Materials Laboratory, Sandia National Laboratories, 1001 University Boulevard, SE, Albuquerque, New Mexico 87106, United States
| | - Roger E. Cramer
- Advanced Materials Laboratory, Sandia National Laboratories, 1001 University Boulevard, SE, Albuquerque, New Mexico 87106, United States
- Department of Chemistry, University of Hawaii—Manoa, 2545 McCarthy Mall, Honolulu, Hawaii 96822-2275, United States
| | - Ping Lu
- Sandia National Laboratories, P.O. Box 5800, Albuquerque, New Mexico 87185-1411, United States
| | - Rana O. Chan
- Advanced Materials Laboratory, Sandia National Laboratories, 1001 University Boulevard, SE, Albuquerque, New Mexico 87106, United States
| | - Bernadette A. Hernandez-Sanchez
- Advanced Materials Laboratory, Sandia National Laboratories, 1001 University Boulevard, SE, Albuquerque, New Mexico 87106, United States
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Lampland NL, Pindwal A, Neal SR, Schlauderaff S, Ellern A, Sadow AD. Magnesium-catalyzed hydrosilylation of α,β-unsaturated esters. Chem Sci 2015; 6:6901-6907. [PMID: 29861929 PMCID: PMC5947512 DOI: 10.1039/c5sc02435h] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2015] [Accepted: 08/20/2015] [Indexed: 11/21/2022] Open
Abstract
ToMMgHB(C6F5)3 (1, ToM = tris(4,4-dimethyl-2-oxazolinyl)phenylborate) catalyzes the 1,4-hydrosilylation of α,β-unsaturated esters. This magnesium hydridoborate compound is synthesized by the reaction of ToMMgMe, PhSiH3, and B(C6F5)3. Unlike the transient ToMMgH formed from the reaction of ToMMgMe and PhSiH3, the borate adduct 1 persists in solution and in the solid state. Crystallographic characterization reveals tripodal coordination of the HB(C6F5)3 moiety to the six-coordinate magnesium center with a ∠Mg-H-B of 141(3)°. The pathway for formation of 1 is proposed to involve the reaction of ToMMgMe and a PhSiH3/B(C6F5)3 adduct because the other possible intermediates, ToMMgH and ToMMgMeB(C6F5)3, react to give an intractable black solid and ToMMgC6F5, respectively. Under catalytic conditions, silyl ketene acetals are isolated in high yield from the addition of hydrosilanes to α,β-unsaturated esters with 1 as the catalyst.
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Affiliation(s)
- Nicole L Lampland
- Department of Chemistry , Iowa State University , 1605 Gilman Hall , Ames , IA 50011 , USA .
| | - Aradhana Pindwal
- Department of Chemistry , Iowa State University , 1605 Gilman Hall , Ames , IA 50011 , USA .
| | - Steven R Neal
- Department of Chemistry , University of Tennessee , 515 Dabney-Buehler Hall, 1420 Circle Dr. , Knoxville , TN 37996 , USA
| | - Shealyn Schlauderaff
- Department of Chemistry , Iowa State University , 1605 Gilman Hall , Ames , IA 50011 , USA .
| | - Arkady Ellern
- Department of Chemistry , Iowa State University , 1605 Gilman Hall , Ames , IA 50011 , USA .
| | - Aaron D Sadow
- Department of Chemistry , Iowa State University , 1605 Gilman Hall , Ames , IA 50011 , USA .
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Li G, Zuccaccia C, Tedesco C, D'Auria I, Macchioni A, Pellecchia C. NMR spectroscopy and X-ray characterisation of cationic N-heteroaryl-pyridylamido Zr(IV) complexes: a further level of complexity for the elusive active species of pyridylamido olefin polymerisation catalysts. Chemistry 2014; 20:232-44. [PMID: 24285639 DOI: 10.1002/chem.201303021] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Indexed: 11/09/2022]
Abstract
New [(N(-),N,N(-))ZrR2] dialkyl complexes (N(-),N,N(-)=pyrrolyl-pyridyl-amido or indolyl-pyridyl-amido; R=Me or CH2Ph) have been synthesised and tested as pre-catalysts for ethene and propene polymerisation in combination with different activators, such as B(C6F5)3, [Ph3C][B(C6F5)4], [HNMe2Ph][B(C6F5)4] or solid AlMe3-depleted methylaluminoxane (DMAO). Polyethylene (M(w)>2 MDa and M(w)/M(n)= 1.3-1.6) has been produced if pre-catalysts were activated with 1000 equivalents of DMAO (based on Al) [activity >1000 kg(PE)(mol([Zr]) h mol atm)(-1)] or by using a higher pre-catalyst concentration and a mixture of [HNPhMe2][B(C6F5)4] (1 equiv) and AliBu2H (60 equiv). In the case of propene polymerisation, activity has been observed only if pre-catalysts were treated with an excess of AliBu2H prior to addition of DMAO, which led to highly isotactic polypropylene ([mmmm]>95%). Neutral pre-catalysts and ion pairs derived from their activation have been characterised in solution by using advanced 1D and 2D NMR spectroscopy experiments. The detection and rationalisation of intercationic NOEs clearly showed the formation of dimeric species in which some pyrrolyl or indolyl π-electron density of one unit is engaged in stabilising the metal centre of the other unit, which relegates the counterions in the second coordination sphere. The solid-state structure of the dimeric indolyl-pyridyl-amidomethylzirconium derivative, determined by X-ray diffraction studies, points toward a weak Zr···η(3)-indolyl interaction. It can be hypothesised that the formation of dimeric cationic species hampers monomer coordination (especially of less reactive α-olefins) and that addition of AliBu2H is crucial to split the homodimers.
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Affiliation(s)
- Gang Li
- Dipartimento di Chimica e Biologia, Università di Salerno via Giovanni Paolo II 132, 84084 Fisciano (SA) (Italy); Dipartimento di Chimica, Biologia e Biotecnologie, Università di Perugia, via Elce di Sotto 8, 06123 Perugia (Italy)
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Luconi L, Klosin J, Smith AJ, Germain S, Schulz E, Hannedouche J, Giambastiani G. Cationic Group-IV pincer-type complexes for polymerization and hydroamination catalysis. Dalton Trans 2013; 42:16056-65. [PMID: 23945547 DOI: 10.1039/c3dt51620b] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Neutral Zr(IV) and Hf(IV) dimethyl complexes stabilized by unsymmetrical dianionic {N,C,N'} pincer ligands have been prepared from their corresponding bis-amido complexes upon treatment with AlMe3. Their structure consists of a central σ-bonded aryl donor group (C) capable of forming robust M-C bonds with the metal center, enforced by the synergic effect of both the coordination of peripheral donor groups (N) and the chelating rigid structure of the {N,C,N} ligand framework. Such a combination translates into systems having a unique balance between stability and reactivity. These Zr(IV) and Hf(IV) dimethyl complexes were converted in situ into cationic species [M(IV){N(-),C(-),N}Me][B(C6F5)4] which are active catalysts for the room temperature (r.t.) intramolecular hydroamination/cyclization of primary and secondary aminoalkenes as well as for the high temperature ethylene-1-octene copolymerizations.
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Affiliation(s)
- Lapo Luconi
- Institute of Chemistry of OrganoMetallic Compounds ICCOM-CNR, Via Madonna del Piano, 10-50019, Sesto F.no., Florence, Italy.
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9
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Krempner C. Role of Siloxides in Transition Metal Chemistry and Homogeneous Catalysis. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100044] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Clemens Krempner
- Department of Chemistry and Biochemistry, Texas Tech University, Box 41061, Lubbock, Texas, 79409‐1061, USA, Fax: +1‐806‐742‐1289
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McNerney B, Whittlesey B, Krempner C. Synthesis and Reactivity of New Pyrazolyl‐Functionalized Potassium Silanides. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201001291] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Brian McNerney
- Department of Chemistry and Biochemistry, Texas Tech University, Memorial Drive & Boston, Lubbock, TX, 74909‐41061, USA, Fax: +1‐806‐742‐1289
| | - Bruce Whittlesey
- Department of Chemistry and Biochemistry, Texas Tech University, Memorial Drive & Boston, Lubbock, TX, 74909‐41061, USA, Fax: +1‐806‐742‐1289
| | - Clemens Krempner
- Department of Chemistry and Biochemistry, Texas Tech University, Memorial Drive & Boston, Lubbock, TX, 74909‐41061, USA, Fax: +1‐806‐742‐1289
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Krempner C, Jäger-Fiedler U, Köckerling M, Reinke H. Synthesis and Structures of Titanium and Zirconium Trisiloxides. Organometallics 2008. [DOI: 10.1021/om800930s] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Clemens Krempner
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, and Institut für Chemie der Universität Rostock, A.-Einstein-Strausse 3a, D-18059 Rostock, Germany
| | - Ulrike Jäger-Fiedler
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, and Institut für Chemie der Universität Rostock, A.-Einstein-Strausse 3a, D-18059 Rostock, Germany
| | - Martin Köckerling
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, and Institut für Chemie der Universität Rostock, A.-Einstein-Strausse 3a, D-18059 Rostock, Germany
| | - Helmut Reinke
- Department of Chemistry and Biochemistry, Texas Tech University, Lubbock, Texas 79409, and Institut für Chemie der Universität Rostock, A.-Einstein-Strausse 3a, D-18059 Rostock, Germany
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Sharma N, Sharma V, Nagar M, Bohra R, Kaushik A, Mathur S, Barth S. Glycol modified cis -diisopropoxy- bis ( N -phenylsalicylideneiminato)zirconium(IV): syntheses, characterization and low temperature transformation to nanocrystalline zirconia. J COORD CHEM 2008. [DOI: 10.1080/00958970801902483] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Namita Sharma
- a Department of Chemistry , University of Rajasthan , Jaipur, India 302004
| | - Vinita Sharma
- a Department of Chemistry , University of Rajasthan , Jaipur, India 302004
| | - Meena Nagar
- a Department of Chemistry , University of Rajasthan , Jaipur, India 302004
| | - Rakesh Bohra
- a Department of Chemistry , University of Rajasthan , Jaipur, India 302004
| | - Ajay Kaushik
- b Department of Chemistry , MLV Textile and Engineering College , Bhilwara
| | - Sanjay Mathur
- c Leibniz-Institut für Neue Materialien gGmbH , Im Stadtwald, Gebäude D2 2, 66123, Saarbrücken
| | - Sven Barth
- c Leibniz-Institut für Neue Materialien gGmbH , Im Stadtwald, Gebäude D2 2, 66123, Saarbrücken
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Krempner C, Reinke H, Weichert K. Synthesis and structure of titanium and zirconium disilane-1,2-diolates. Polyhedron 2007. [DOI: 10.1016/j.poly.2007.03.043] [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]
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Krempner C, Reinke H, Weichert K. Synthesis and Structure of Cyclic Trinuclear Zinc Disiloxides. Eur J Inorg Chem 2007. [DOI: 10.1002/ejic.200600957] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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15
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Krempner C, Reinke H, Weichert K. Synthesis and Structure of Cyclic Aluminum Disiloxides. Organometallics 2007. [DOI: 10.1021/om060969h] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- C. Krempner
- Institut für Chemie der Universität Rostock, A.-Einstein-Strasse 3a, D-18059 Rostock, Germany
| | - H. Reinke
- Institut für Chemie der Universität Rostock, A.-Einstein-Strasse 3a, D-18059 Rostock, Germany
| | - K. Weichert
- Institut für Chemie der Universität Rostock, A.-Einstein-Strasse 3a, D-18059 Rostock, Germany
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Chemo-reductive silylation of hypersilyl arenes – Unusual cleavage of an aromatic CC double-bond. INORG CHEM COMMUN 2007. [DOI: 10.1016/j.inoche.2006.10.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Fandos R, Gallego B, Otero A, Rodríguez A, Ruiz MJ, Terreros P. Synthesis and characterization of complexes containing Ti–O–Si moieties. Catalytic activity in olefin epoxidation. Dalton Trans 2007:871-7. [PMID: 17297515 DOI: 10.1039/b616064f] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Reaction of [Cp*TiMe3] with O(SiPh2OH)2 yields the titanium siloxide derivative [Cp*TiMe{(OSiPh2)2O}]. Complex reacts with H2O to yield the corresponding oxo-titanium derivative [(Cp*Ti{(OSiPh2)2O})2(micro-O)]. The molecular structure of complex has been established by X-ray diffraction. Complex reacts with triphenylsilanol to give the asymmetric titanium siloxide [Cp*Ti(OSiPh3){(OSiPh2)2O}]. Treatment of the dinuclear titanium compound [(Cp*TiCl2)2(micro-O)] with an equimolar amount of O(SiPh2OH)2 yields complex [(Cp*TiCl)2{micro-(OSiPh2)2O}(micro-O)] in which the disiloxide moiety is bridging two titanium atoms. The structure of has been determined by X-ray diffraction. Reaction of [Cp*TiMe3] with HOSiPh3 yields the titanium triphenylsiloxide [Cp*TiMe2(OSiPh3)]. Complex reacts with water to yield [{Cp*TiMe(OSiPh3)}2(micro-O)]. The triflate compound [Cp*Ti(OSiPh3)2(OTf)] can be prepared by reaction of with HOTf and triphenylsilanol. We have tested the catalytic activity of some of the complexes in the epoxidation of cyclohexene.
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Affiliation(s)
- Rosa Fandos
- Universidad de Castilla-La Mancha, Facultad de Ciencias del Medio Ambiente, Campus de Toledo, Avda. Carlos III, s/n, 45073, Toledo, Spain
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