1
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Tröndle S, Freytag M, Jones PG, Tamm M. Allyl Palladium Complexes of Cycloheptatrienyl-Cyclopentadienyl Phosphane Ligands in Buchwald-Hartwig Amination Reactions. Eur J Inorg Chem 2019. [DOI: 10.1002/ejic.201900225] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Sabrina Tröndle
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Matthias Freytag
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
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2
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Braunschweig H, Damme A, Dück K, Fuß M, Hörl C, Kramer T, Krummenacher I, Kupfer T, Paprocki V, Schneider C. Ansa-Complexes of [Mn(η 5-C 5H 5)(η 6-C 6H 6)]: Preparation, Characterization, and Reactivity of [ n]Manganoarenophanes ( n=1, 2, 3). Chemistry 2015; 21:14797-803. [DOI: 10.1002/chem.201502161] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2015] [Indexed: 11/06/2022]
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3
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Braunschweig H, Brückner C, Celik MA, Dück K, Hupp F, Kramer T, Krebs J, Krummenacher I. Ansa-Bridged Bis(benzene) Titanium Complexes. Chemistry 2015; 21:11056-64. [DOI: 10.1002/chem.201500737] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2015] [Indexed: 11/06/2022]
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Braunschweig H, Damme A, Demeshko S, Dück K, Kramer T, Krummenacher I, Meyer F, Radacki K, Stellwag-Konertz S, Whittell GR. A Paramagnetic Heterobimetallic Polymer: Synthesis, Reactivity, and Ring-Opening Polymerization of Tin-Bridged Homo- and Heteroleptic Vanadoarenophanes. J Am Chem Soc 2015; 137:1492-500. [DOI: 10.1021/ja510884h] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Holger Braunschweig
- Institut
für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Alexander Damme
- Institut
für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Serhiy Demeshko
- Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse
4, 37077 Göttingen, Germany
| | - Klaus Dück
- Institut
für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Thomas Kramer
- Institut
für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Ivo Krummenacher
- Institut
für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Franc Meyer
- Institut
für Anorganische Chemie, Georg-August-Universität Göttingen, Tammannstrasse
4, 37077 Göttingen, Germany
| | - Krzysztof Radacki
- Institut
für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - Sascha Stellwag-Konertz
- Institut
für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
| | - George R. Whittell
- School
of Chemistry, University of Bristol, Cantocks Close, Bristol BS8 1TS, United Kingdom
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Russell AD, Gilroy JB, Lam K, Haddow MF, Harvey JN, Geiger WE, Manners I. Influence of Cyclopentadienyl Ring-Tilt on Electron-Transfer Reactions: Redox-Induced Reactivity of Strained [2] and [3]Ruthenocenophanes. Chemistry 2014; 20:16216-27. [DOI: 10.1002/chem.201403512] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Indexed: 11/07/2022]
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6
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Russell AD, Gilroy JB, Manners I. Comparative Studies of Thermally Induced Homolytic CarbonCarbon Bond Cleavage Reactions of Strained Dicarba[2]ferrocenophanes and Their Ring-Opened Oligomers and Polymers. Chemistry 2014; 20:4077-85. [DOI: 10.1002/chem.201304396] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2013] [Revised: 12/12/2013] [Indexed: 11/11/2022]
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7
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8
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Tagne Kuate AC, Pinkert L, Freytag M, Jones PG, Tamm M. The Reducing Ability of Cycloheptatrienyl-Cyclopentadienyl Zirconium Sandwich Complexes towards Silver(I). Z Anorg Allg Chem 2013. [DOI: 10.1002/zaac.201300441] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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9
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Arnold T, Braunschweig H, Hupp F, Radacki K, Sen SS. Reactions of a [1],[1]Disilamolybdenocenophane with Unsaturated Compounds. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300766] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Thomas Arnold
- Institut für Anorganische Chemie, Julius‐Maximilians‐ Universität Würzburg, Am Hubland, 97074 Würzburg, Germany, http://www‐anorganik.chemie.uni‐wuerzburg.de/Braunschweig/index.html
| | - Holger Braunschweig
- Institut für Anorganische Chemie, Julius‐Maximilians‐ Universität Würzburg, Am Hubland, 97074 Würzburg, Germany, http://www‐anorganik.chemie.uni‐wuerzburg.de/Braunschweig/index.html
| | - Florian Hupp
- Institut für Anorganische Chemie, Julius‐Maximilians‐ Universität Würzburg, Am Hubland, 97074 Würzburg, Germany, http://www‐anorganik.chemie.uni‐wuerzburg.de/Braunschweig/index.html
| | - Krzysztof Radacki
- Institut für Anorganische Chemie, Julius‐Maximilians‐ Universität Würzburg, Am Hubland, 97074 Würzburg, Germany, http://www‐anorganik.chemie.uni‐wuerzburg.de/Braunschweig/index.html
| | - Sakya S. Sen
- Institut für Anorganische Chemie, Julius‐Maximilians‐ Universität Würzburg, Am Hubland, 97074 Würzburg, Germany, http://www‐anorganik.chemie.uni‐wuerzburg.de/Braunschweig/index.html
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10
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Tagne Kuate AC, Sameni S, Freytag M, Jones PG, Tamm M. Phosphane-functionalized cycloheptatrienyl-cyclopentadienyl titanium sandwich complexes: phosphorus ligands with an integrated reducing agent for palladium(0) catalyst generation. Angew Chem Int Ed Engl 2013; 52:8638-42. [PMID: 23818449 DOI: 10.1002/anie.201304252] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Revised: 06/06/2013] [Indexed: 11/11/2022]
Affiliation(s)
- Alain C Tagne Kuate
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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11
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Tagne Kuate AC, Sameni S, Freytag M, Jones PG, Tamm M. Phosphane-Functionalized Cycloheptatrienyl-Cyclopentadienyl Titanium Sandwich Complexes: Phosphorus Ligands with an Integrated Reducing Agent for Palladium(0) Catalyst Generation. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201304252] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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12
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Braunschweig H, Breher F, Capper S, Dück K, Fuß M, Jimenez-Halla JOC, Krummenacher I, Kupfer T, Nied D, Radacki K. Heteroleptic [n]chromoarenophanes: ansa complexes derived from [Cr(η(5)-C5H5)(η(6)-C6H6)]. Chemistry 2012. [PMID: 23180426 DOI: 10.1002/chem.201203288] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The synthesis of ansa complexes has been studied intensively owing to their importance as homogeneous catalysts and as precursors of metal-containing polymers. However, paramagnetic non-metallocene derivatives are rare and have been limited to examples with vanadium and titanium. Herein, we report an efficient procedure for the selective dilithiation of paramagnetic sandwich complex [Cr(η(5)-C(5)H(5))(η(6)-C(6)H(6))], which allows the preparation of a series of [n]chromoarenophanes (n = 1, 2, 3) that feature silicon, germanium, and tin atoms at the bridging positions. The electronic and structural properties of these complexes were probed by X-ray diffraction analysis, cyclic voltammetry, and by UV/Vis and EPR spectroscopy. The spectroscopic parameters for the strained and less strained complexes (i.e., with multiple-atom linkers) indicate that the unpaired electron resides primarily in a d(z)2 orbital on chromium(I); this result was also supported by density functional theory (DFT) calculations. We did not observe a correlation between the experimental UV/Vis and EPR data and the degree of molecular distortion in these ansa complexes. The treatment of tin-bridged complex [Cr(η(5)-C(5)H(4))(η(6)-C(6)H(5))SntBu(2)] with [Pt(PEt(3))(3)] results in the non-regioselective insertion of the low-valent Pt(0) fragment into the C(ipso)-Sn bonds in both the five- and six-membered rings, thereby furnishing a bimetallic complex. This observed reactivity suggests that ansa complexes of this type are promising starting materials for the synthesis of bimetallic complexes in general and also underline their potential to undergo ring-opening processes to yield new metal-containing polymers.
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Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
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13
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Russell AD, Gilroy JB, Lam K, Haddow MF, Harvey JN, Geiger WE, Manners I. MetalMetal Bond Formation Between [n]Metallocenophanes: Synthesis and Characterisation of a Dicarba[2]ruthenocenophanium Dimer. Chemistry 2012; 18:8000-3. [DOI: 10.1002/chem.201201129] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2012] [Indexed: 11/10/2022]
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14
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Braunschweig H, Friedrich M, Radacki K, Wolf J. Synthesis and Reactivity of Palladium- and Platinum-Bridged Heterobimetallic [3]Trochrocenophanes. Organometallics 2012. [DOI: 10.1021/om201119v] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Holger Braunschweig
- Institut für
Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, D-97074,
Würzburg Germany
| | - Maria Friedrich
- Institut für
Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, D-97074,
Würzburg Germany
| | - Krzysztof Radacki
- Institut für
Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, D-97074,
Würzburg Germany
| | - Justin Wolf
- Institut für
Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, D-97074,
Würzburg Germany
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15
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Braunschweig H, Dörfler R, Mies J, Radacki K, Schmitt M. Iron ansa half sandwich complexes bearing a bridging distannadiyl moiety. J Organomet Chem 2012. [DOI: 10.1016/j.jorganchem.2011.11.002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
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16
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Tagne Kuate AC, Daniliuc CG, Jones PG, Tamm M. Synthesis, Reactivity and Ring‐Opening Polymerization of a Tin‐Bridged
ansa
‐Cycloheptatrienyl‐Cyclopentadienyl Titanium Sandwich Complex. Eur J Inorg Chem 2012. [DOI: 10.1002/ejic.201101339] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Alain C. Tagne Kuate
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany, Fax: +49‐531‐391‐5387
| | - Constantin G. Daniliuc
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany, Fax: +49‐531‐391‐5387
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany, Fax: +49‐531‐391‐5387
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Braunschweig, Hagenring 30, 38106 Braunschweig, Germany, Fax: +49‐531‐391‐5387
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17
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Braunschweig H, Kupfer T. [n]Borametalloarenophanes (n = 1, 2): Strained Systems with Uncommon Reactivity Patterns. Eur J Inorg Chem 2011. [DOI: 10.1002/ejic.201100609] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Adams CJ, Braunschweig H, Fuß M, Kraft K, Kupfer T, Manners I, Radacki K, Whittell GR. Syntheses of Group 4 ansa-Trovacene Complexes and Conversion of [1]Silatrovacenophanes into Paramagnetic Metallopolymers by Ring-Opening Polymerization. Chemistry 2011; 17:10379-87. [DOI: 10.1002/chem.201100919] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2011] [Indexed: 11/12/2022]
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19
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Glöckner A, Bannenberg T, Büschel S, Daniliuc CG, Jones PG, Tamm M. Cycloheptatrienyl Zirconium Sandwich Complexes with Lewis Basic Phospholyl Ligands (Phosphatrozircenes): Synthesis, Structure, Bonding and Coordination Chemistry. Chemistry 2011; 17:6118-28. [DOI: 10.1002/chem.201100104] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2011] [Indexed: 11/10/2022]
Affiliation(s)
- Andreas Glöckner
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo‐Wilhelmina zu Braunschweig, Hagenring 30, 38106 Braunschweig (Germany), Fax: (+49) 531‐391‐5309
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo‐Wilhelmina zu Braunschweig, Hagenring 30, 38106 Braunschweig (Germany), Fax: (+49) 531‐391‐5309
| | - Susanne Büschel
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo‐Wilhelmina zu Braunschweig, Hagenring 30, 38106 Braunschweig (Germany), Fax: (+49) 531‐391‐5309
| | - Constantin G. Daniliuc
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo‐Wilhelmina zu Braunschweig, Hagenring 30, 38106 Braunschweig (Germany), Fax: (+49) 531‐391‐5309
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo‐Wilhelmina zu Braunschweig, Hagenring 30, 38106 Braunschweig (Germany), Fax: (+49) 531‐391‐5309
| | - Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo‐Wilhelmina zu Braunschweig, Hagenring 30, 38106 Braunschweig (Germany), Fax: (+49) 531‐391‐5309
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20
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Braunschweig H, Dörfler R, Gruss K, Köhler J, Radacki K. Insertion vs Ligand Exchange: Reactivity of Distanna Ansa Half-Sandwich Complexes of Molybdenum and Tungsten toward Isocyanide and Phosphine Complexes of Nickel and Palladium. Organometallics 2010. [DOI: 10.1021/om101049d] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Rainer Dörfler
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Katrin Gruss
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Julia Köhler
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
| | - Krzysztof Radacki
- Institut für Anorganische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany
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21
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Braunschweig H, Fuß M, Mohapatra SK, Kraft K, Kupfer T, Lang M, Radacki K, Daniliuc CG, Jones PG, Tamm M. Synthesis and Reactivity of Boron-, Silicon-, and Tin-Bridged ansa-Cyclopentadienyl-Cycloheptatrienyl Titanium Complexes (Troticenophanes). Chemistry 2010; 16:11732-43. [DOI: 10.1002/chem.201001486] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2010] [Indexed: 11/06/2022]
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22
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Patra S, Whittell G, Nagiah S, Ho CL, Wong WY, Manners I. Photocontrolled Living Anionic Polymerization of Phosphorus-Bridged [1]Ferrocenophanes: A Route to Well-Defined Polyferrocenylphosphine (PFP) Homopolymers and Block Copolymers. Chemistry 2010; 16:3240-50. [DOI: 10.1002/chem.200902886] [Citation(s) in RCA: 61] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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23
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Bera H, Braunschweig H, Dörfler R, Hammond K, Oechsner A, Radacki K, Uttinger K. Synthesis, Structure and Reactivity of Disila- and DistannaansaHalf-Sandwich Complexes of Molybdenum and Tungsten. Chemistry 2009; 15:12092-8. [DOI: 10.1002/chem.200901422] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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24
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Masson G, Herbert D, Whittell G, Holland J, Lough A, Green J, Manners I. Synthesis and Reactivity of a Strained Silicon-Bridged [1]Ferrocenophanium Ion. Angew Chem Int Ed Engl 2009; 48:4961-4. [DOI: 10.1002/anie.200901213] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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25
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Braunschweig H, Kupfer T, Mies J, Oechsner A. Difluorenyl[2]borametallocenophanes of Group 4 Metals: Synthesis and Structure. Eur J Inorg Chem 2009. [DOI: 10.1002/ejic.200900277] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Julius‐Maximilians‐Universität Würzburg, Am Hubland, 97074 Würzburg, Germany, Fax: +49‐931‐888‐4623
| | - Thomas Kupfer
- Department of Chemistry 6‐421, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, Massachusetts 02139, USA
| | - Jan Mies
- Institut für Anorganische Chemie, Julius‐Maximilians‐Universität Würzburg, Am Hubland, 97074 Würzburg, Germany, Fax: +49‐931‐888‐4623
| | - Andreas Oechsner
- Institut für Anorganische Chemie, Julius‐Maximilians‐Universität Würzburg, Am Hubland, 97074 Würzburg, Germany, Fax: +49‐931‐888‐4623
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26
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Masson G, Herbert D, Whittell G, Holland J, Lough A, Green J, Manners I. Synthesis and Reactivity of a Strained Silicon-Bridged [1]Ferrocenophanium Ion. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200901213] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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27
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Büschel S, Jungton AK, Bannenberg T, Randoll S, Hrib CG, Jones PG, Tamm M. Secondary Interactions in Phosphane-Functionalized Group 4 Cycloheptatrienyl-Cyclopentadienyl Sandwich Complexes. Chemistry 2009; 15:2176-84. [PMID: 19145604 DOI: 10.1002/chem.200802518] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Susanne Büschel
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo-Wilhelmina zu Braunschweig, Hagenring 30, 38106 Braunschweig, Germany
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28
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Braunschweig H, Gross M, Hammond K, Friedrich M, Kraft M, Oechsner A, Radacki K, Stellwag S. [2]Borametallocenophanes of Group 4 Metals: Synthesis and Structure. Chemistry 2008; 14:8972-8979. [DOI: 10.1002/chem.200800964] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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29
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Braunschweig H, Kaupp M, Adams CJ, Kupfer T, Radacki K, Schinzel S. Synthesis, reactivity, and electronic structure of [n]vanadoarenophanes: an experimental and theoretical study. J Am Chem Soc 2008; 130:11376-93. [PMID: 18680259 DOI: 10.1021/ja802034p] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An optimized procedure for the selective dimetalation of [V(eta (6)-C 6H 6) 2] by BuLi/tmeda allowed for the isolation and characterization of [V(eta (6)-C 6H 5Li) 2].tmeda. X-ray diffraction of its thf solvate [V(eta (6)-C 6H 5Li) 2].(thf) 7 revealed an unsymmetrical, dimeric composition in the solid state, in which both subunits are connected by three bridging lithium atoms. Treatment with several element dihalides facilitated the isolation of [ n]vanadoarenophanes ( n = 1, 2) with boron and silicon in the bridging positions. In agreement with the number and covalent radii of the bridging elements, these derivatives exhibit molecular ring strain to a greater or lesser extent. The B-B bond of the [2]bora species [V(eta (6)-C 6H 5) 2B 2(NMe 2) 2] was readily cleaved by [Pt(PEt 3) 3] to afford the corresponding oxidative addition product. Subsequently, [V(eta (6)-C 6H 5) 2B 2(NMe 2) 2] was employed as a diborane(4) precursor in the diboration of 2-butyne under stoichiometric, homogeneous, and heterogeneous catalysis conditions. This transformation is facilitated by the reduction of molecular ring strain, which was confirmed by a decrease of the tilt angle alpha observed in the corresponding solid-state structures. EPR spectroscopy was used to probe the electronic structure of strained [ n]vanadoarenophanes and revealed an obvious correlation between the degree of molecular distortion and the observed hyperfine coupling constant a iso. State-of-the-art DFT calculations were able to reproduce the measured isotropic vanadium hyperfine couplings and the coupling anisotropies. The calculations confirmed the decrease of the absolute isotropic hyperfine couplings with increasing tilt angle. Closer analysis showed that this is mainly due to increased positive contributions to the spin density at the vanadium nucleus from the spin polarization of doubly occupied valence orbitals of vanadium-ligand sigma-antibonding character. The latter are destabilized and thus made more polarizable in the bent structures.
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Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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Ieong N, Chan W, Lough A, Haddow M, Manners I. Photoinduced FeCp Bond Cleavage and Insertion Reactions of Strained Silicon- and Sulphur-Bridged [1]Ferrocenophanes in the Presence of Transition-Metal Carbonyls. Chemistry 2008; 14:1253-63. [DOI: 10.1002/chem.200700961] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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Chan WY, Lough AJ, Manners I. Photoreactivity and Photopolymerization of Silicon-Bridged [1]Ferrocenophanes in the Presence of Terpyridine Initiators: Unprecedented Cleavage of Both Iron–Cyclopentadienyl Bonds in the Presence of Chlorosilanes. Chemistry 2007; 13:8867-76. [PMID: 17654755 DOI: 10.1002/chem.200700420] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The photopolymerisation of sila[1]ferrocenophane [Fe(eta-C5H4)2SiMe2] (3) with 4,4',4''-tri-tert-butyl-2,2':6',2''-terpyridine (tBu3terpy) as initiator has been explored. High-molecular-weight polyferrocenylsilane (PFS) [{Fe(eta-C5H4)2SiMe2}n] (5) was formed in high yield when a stoichiometric amount of tBu3terpy was used at 5 degrees C. Photopolymerisation of ferrocenophane 3 at higher temperatures gave PFS 5 in lower yield and with a reduced molecular weight as a result of a slower propagation rate. Remarkably, when Me3SiCl was added as a capping agent before photopolymerisation, subsequent photolysis of the reaction mixture resulted in the unprecedented cleavage of both iron-Cp bonds in ferrocenophane 3: iron(II) complex [Fe(tBu3terpy)2Cl2] (7Cl) was formed and the silane fragment (C5H4SiMe3)2SiMe2 (8) was released. The iron-Cp bond cleavage reaction also proceeded in ambient light, although longer reaction times were required. In addition, the unexpected cleavage chemistry in the presence of Me3SiCl was found to be applicable to other photoactive ferrocenes such as benzoylferrocene. For benzoylferrocene and ferrocenophane 3, the presence of metal-to-ligand charge transfer (MLCT) character in their low-energy transitions in the visible region probably facilitates photolytic iron-Cp bond cleavage, but this reactivity is suppressed when the strength of the iron-Cp bond is increased by the presence of electron-donating substituents on the cyclopentadienyl rings.
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Affiliation(s)
- Wing Yan Chan
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
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Herbert DE, Mayer UFJ, Manners I. Strained metallocenophanes and related organometallic rings containing pi-hydrocarbon ligands and transition-metal centers. Angew Chem Int Ed Engl 2007; 46:5060-81. [PMID: 17587203 DOI: 10.1002/anie.200604409] [Citation(s) in RCA: 211] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The structures, bonding, and ring-opening reactions of strained cyclic carbon-based molecules form a key component of standard textbooks. In contrast, the study of strained organometallic molecules containing transition metals is a much more recent development. A wealth of recent research has revealed fascinating nuances in terms of structure, bonding, and reactivity. Building on initial work on strained ferrocenophanes, a broad range of strained organometallic rings composed of a variety of different metals, pi-hydrocarbon ligands, and bridging elements has now been developed. Such strained species can potentially undergo ring-opening reactions to functionalize surfaces and ring-opening polymerization to form easily processed metallopolymers with properties determined by the presence of the metal and spacer. This Review summarizes the current state of knowledge on the preparation, structural characterization, electronic structure, and reactivity of strained organometallic rings with pi-hydrocarbon ligands and d-block metals.
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Affiliation(s)
- David E Herbert
- School of Chemistry, University of Bristol, Cantock's Close, Bristol, BS81TS, UK
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Abstract
The study of metallopolymers has blossomed into a mature field over the last few decades. Especially, polyferrocenylsilane (PFS) chemistry has taken a tremendous leap and continues to raise intense interest. Since the discovery of thermal ring-opening polymerization (ROP) of sila[1]ferrocenophanes, PFSs have been also accessed by anionic, cationic, transition-metal-catalyzed, and photolytic anionic ROP methodologies. A plethora of synthetic strategies have been devised, enabling access to a wide variety of copolymers, polyelectrolytes, and nanostructured materials. The distinctive physical properties and functions of many PFS-based polymers have been explored, leading to their apt exploitation in technical applications. Therefore, it is conceivable that PFS-related platforms might be indispensable nano-objects in the near future, as they stand on the verge of a new generation of sophisticated materials.
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Affiliation(s)
- Vasilios Bellas
- Ernst-Berl Institute for Chemical Engineering and Macromolecular Science, Darmstadt University of Technology, Petersenstrasse 22, 64287 Darmstadt, Germany
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Herbert D, Mayer U, Manners I. Gespannte Metallocenophane und ähnliche metallorganische Ringe mit π-Kohlenwasserstoffliganden und Übergangsmetallzentren. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200604409] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Braunschweig H, Kupfer T, Lutz M, Radacki K. Ansa [1]Trochrocenophanes and Their Related Unstrained 1,1‘-Disubstituted Counterparts: Synthesis and Electronic Structure. J Am Chem Soc 2007; 129:8893-906. [PMID: 17592847 DOI: 10.1021/ja0724947] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The heteroleptic sandwich complex [Cr(eta(5)-C5H5)(eta(7)-C7H7)] (trochrocene) was prepared by subsequent treatment of CrCl3 with NaCp and Mg in the presence of cycloheptatriene in yields of 40%. Selective dimetalation employing tBuLi/tmeda (N, N, N', N'-tetramethylethylenediamine) afforded the highly reactive species [Cr(eta(5)-C5H4Li)(eta(7)-C7H6Li)] x tmeda. An X-ray crystal-structure determination of its thf solvate revealed a symmetrical, dimeric composition in the solid state, that is, a formula of [Cr(eta(5)-C5H4Li)(eta(7)-C7H6Li)]2 x (thf)8, where the C5H4 moieties of both units are connected by two bridging lithium atoms. Addition of different element dihalides to the dilithio precursor facilitated the isolation of ansa complexes with boron and germanium in the bridging position. Structural characterization by X-ray diffraction studies on [Cr(eta(5)-C5H4)-BN(SiMe3)2-(eta(7)-C7H6)] and [Cr(eta(5)-C5H4)-GeMe2-(eta(7)-C7H6)] emphasized the strained character with tilt angles of 23.87(13) degrees and 15.07(17) degrees , respectively. In contrast, the isolation of the appropriate [1]stannatrochrocenophane failed because of the thermal lability of the resulting product. However, the corresponding 1,1'-disubstitued derivatives [Cr(eta(5)-C5H4R)(eta(7)-C7H6R)] (R = B(Cl)NiPr2, SiMe3, GeMe3, SnMe3) were obtained by reverse addition of the dilithio precursor to an excess of the element (di)halide. The unstrained nature was proven by a crystal structure analysis of the 1,1'-diborylated species. The electronic structure of these substituted trochrocene derivatives, as well as of the [2]bora and [n]sila congeners (n = 1, 2), was investigated by means of UV-vis spectroscopy and DFT methods. As a consequence of the strong electronic influence of the B-N pi-system on the LUMOs, the UV-vis studies revealed a complementary correlation of the lowest energy band maxima as a function of molecular distortion for the boron containing species on the one hand, and the boron-free compounds on the other hand. These trends were reproduced fairly well by time dependent DFT calculations.
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Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Julius-Maximilians-Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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Braunschweig H, Buggisch N, Englert U, Homberger M, Kupfer T, Leusser D, Lutz M, Radacki K. Dilithiation of Bis(benzene)molybdenum and Subsequent Isolation of a Molybdenum-Containing Paracyclophane. J Am Chem Soc 2007; 129:4840-6. [PMID: 17375929 DOI: 10.1021/ja0692130] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The homoleptic sandwich complex bis(benzene)molybdenum, [Mo(eta6-C6H6)2], was successfully dilithiated by employing an excess of BuLi in the presence of N,N,N',N'-tetramethylethylenediamine (up to 6 equiv each) at slightly elevated temperatures furnishing the highly reactive, ring metalated species [Mo(eta6-C6H5Li)2].tmeda in high yields. Alternatively, this compound was synthesized upon prolonged sonication with 5 equiv of tBuLi/tmeda without heating. An X-ray crystal structure determination revealed a symmetrical, dimeric composition in the solid state, i.e., a formula of [Mo(eta6-C6H5Li)2]2.(thf)6, where the six-membered rings are connected by two pairs of bridging lithium atoms. The synthesis of an elusive ansa-bridged complex failed in the case of a [1]bora and a [1]sila bridge due to the thermal lability of the resulting compounds. Instead, reverse addition of the dilithio precursor to an excess of the appropriate element dihalide facilitated the isolation of several unstrained, 1,1'-disubstituted derivatives, namely, [Mo{eta6-C6H5(BN(SiMe3)2X)}2] (X = Cl, Br) and [Mo{eta6-C6H5(SiiPr2Cl)}2], respectively. However, the incorporation of a less congesting [2]sila bridge was accomplished. In addition to the formation of [Mo{(eta6-C6H5)2Si2Me4}], a molybdenum-containing paracylophane complex was isolated and characterized by means of crystal structure analysis. The ancillary formation of 1 equiv of bis(benzene)molybdenum strongly suggests that this species is generated by deprotonation of the ansa-bridged complex by the dilithiated precursor and subsequent reaction with a second equivalent of the disilane.
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Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Julius-Maximilians Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany.
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Braunschweig H, Kupfer T, Radacki K. Selektive Dimetallierung von [Mn(η5-C5H5)(η6-C6H6)]: Struktur im Kristall und Umsetzung zu gespannten [n]Metalloarenophanen. Angew Chem Int Ed Engl 2007. [DOI: 10.1002/ange.200604391] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Braunschweig H, Kupfer T, Radacki K. Selective Dimetalation of [Mn(η5-C5H5)(η6-C6H6)]: Crystal Structure and Conversion to Strained [n]Metalloarenophanes. Angew Chem Int Ed Engl 2007; 46:1630-3. [PMID: 17230595 DOI: 10.1002/anie.200604391] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Bayerische Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
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Tamm M, Kunst A, Bannenberg T, Randoll S, Jones PG. Synthesis and Reactivity of Silicon- and Germanium-Bridged ansa-Cycloheptatrienyl−Cyclopentadienyl Titanium Complexes. Organometallics 2006. [DOI: 10.1021/om060928l] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthias Tamm
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo-Wilhelmina, Hagenring 30, D-38106 Braunschweig, Germany
| | - Andreas Kunst
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo-Wilhelmina, Hagenring 30, D-38106 Braunschweig, Germany
| | - Thomas Bannenberg
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo-Wilhelmina, Hagenring 30, D-38106 Braunschweig, Germany
| | - Sören Randoll
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo-Wilhelmina, Hagenring 30, D-38106 Braunschweig, Germany
| | - Peter G. Jones
- Institut für Anorganische und Analytische Chemie, Technische Universität Carolo-Wilhelmina, Hagenring 30, D-38106 Braunschweig, Germany
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Bartole-Scott A, Braunschweig H, Kupfer T, Lutz M, Manners I, Nguyen TL, Radacki K, Seeler F. Synthesis ofansa-[n]Silacyclopentadienyl-Cycloheptatrienyl-Chromium Complexes (n = 1, 2): Novel Precursors for Polymers Bearing Chromium in the Backbone. Chemistry 2006; 12:1266-73. [PMID: 16281318 DOI: 10.1002/chem.200500689] [Citation(s) in RCA: 72] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Reaction of [(eta5-C5H4Li)(eta7-C7H6Li)Cr]tmeda with a variety of dialkyl(dichloro)silanes in aliphatic solvents afforded the corresponding [1]silatrochrocenophanes. Structural characterization by X-ray diffraction analysis of the [1]silatrochrocenophanes bearing Me2Si, (iPr)2Si, and silacyclobutane bridges revealed tilt angles alpha of 15.56(12) degrees , 15.8(1) degrees , and 16.33(17) degrees , respectively. Analogously, a [2]silatrochrocenophane (6) was prepared in excellent yield by reaction of [(eta5-C5H4Li)(eta7-C7H6Li)Cr]tmeda with 1,2-dichloro-1,1,2,2-tetramethyldisilane. This complex also was characterized structurally and exhibited a tilt angle alpha of 2.60(15) degrees. The [1]silatrochrocenophane bearing the Me2Si bridge underwent facile and regioselective carbon-silicon bond cleavage with [Pt(PEt3)4] to give a very high yield of an oxidative addition product. The ring-opening polymerization of these novel [1]silatrochrocenophanes afforded ring-opened chromium-based polymers.
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Affiliation(s)
- Alexandra Bartole-Scott
- Inorganic Rings and Macromolecules, Dept. of Chemistry, 80 St. George St., Toronto, Ontario M5S 3H6, Canada
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Tanabe M, Bourke SC, Herbert DE, Lough AJ, Manners I. Reversible, Strain-Controlled Haptotropic Shifts of Cyclopentadienyl Ligands in [1]- and [2]Metallocenophanes. Angew Chem Int Ed Engl 2005; 44:5886-90. [PMID: 16092137 DOI: 10.1002/anie.200501155] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Makoto Tanabe
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
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Tanabe M, Bourke SC, Herbert DE, Lough AJ, Manners I. Reversible, Strain-Controlled Haptotropic Shifts of Cyclopentadienyl Ligands in [1]- and [2]Metallocenophanes. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200501155] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Braunschweig H, Lutz M, Radacki K. Synthese vonansa-[2]Boracyclopentadienylcycloheptatrienylchrom und Reaktion zumansa-Platinabis(boryl)-Komplex durch oxidative Addition der Bor-Bor-Bindung. Angew Chem Int Ed Engl 2005. [DOI: 10.1002/ange.200500686] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Braunschweig H, Lutz M, Radacki K. Synthesis ofansa-[2]Boracyclopentadienylcycloheptatrienylchromium and Its Reaction to theansa-Platinabis(boryl) Complex by Oxidative Addition of the BoronBoron Bond. Angew Chem Int Ed Engl 2005; 44:5647-51. [PMID: 16013074 DOI: 10.1002/anie.200500686] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Holger Braunschweig
- Institut für Anorganische Chemie, Bayerische Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany.
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Tamm M, Kunst A, Bannenberg T, Herdtweck E, Schmid R. Cycloheptatrienyl−Cyclopentadienyl−Zirconium Sandwich Complexes: Structure and Bonding. Organometallics 2005. [DOI: 10.1021/om050192c] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Matthias Tamm
- Lehrstuhl für Anorganische Chemie, Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany, and Lehrstuhl für Anorganische Chemie II, Organometallics and Materials Chemistry, Ruhr-Universität Bochum, D-44780 Bochum, Germany
| | - Andreas Kunst
- Lehrstuhl für Anorganische Chemie, Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany, and Lehrstuhl für Anorganische Chemie II, Organometallics and Materials Chemistry, Ruhr-Universität Bochum, D-44780 Bochum, Germany
| | - Thomas Bannenberg
- Lehrstuhl für Anorganische Chemie, Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany, and Lehrstuhl für Anorganische Chemie II, Organometallics and Materials Chemistry, Ruhr-Universität Bochum, D-44780 Bochum, Germany
| | - Eberhardt Herdtweck
- Lehrstuhl für Anorganische Chemie, Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany, and Lehrstuhl für Anorganische Chemie II, Organometallics and Materials Chemistry, Ruhr-Universität Bochum, D-44780 Bochum, Germany
| | - Rochus Schmid
- Lehrstuhl für Anorganische Chemie, Department Chemie, Technische Universität München, Lichtenbergstrasse 4, D-85747 Garching, Germany, and Lehrstuhl für Anorganische Chemie II, Organometallics and Materials Chemistry, Ruhr-Universität Bochum, D-44780 Bochum, Germany
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Tamm M, Kunst A, Herdtweck E. Regioselective Si–C bond activation in silicon-bridged ansa-cycloheptatrienyl-cyclopentadienyl complexes. Chem Commun (Camb) 2005:1729-31. [PMID: 15791313 DOI: 10.1039/b417884j] [Citation(s) in RCA: 77] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
On treatment with [Pt(PEt3)3], silicon-bridged ansa-cycloheptatrienyl-cyclopentadienyl Ti and V complexes, [1]silatroticenophane and [1]silatrovacenophane, undergo oxidative addition and regioselective insertion of a Pt(PEt3)2 moiety into the silicon-carbon bond to the seven-membered ring; the resulting complexes, [2]platinasilatroticenophane and [2]platinasilatrovacenophane, can be partly used as single-source catalysts for the ring-opening polymerization (ROP) of the original highly strained sandwich molecules.
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Affiliation(s)
- Matthias Tamm
- Lehrstuhl für Anorganische Chemie, Department Chemie, Technische Universität Munchen, Lichtenbergstr. 4, D-85747 Garching, Germany.
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