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Journal articles on the topic 'Ansa-bridge'

Author: Grafiati

Published: 4 June 2021

Last updated: 16 February 2022

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1

Morton, Jason G. M., Haif Al-Shammari, Yunshan Sun, Jiangtao Zhu, and Douglas W. Stephan. "1,1-Olefin-bridged bis-(2-indenyl) metallocenes of titanium and zirconium." Dalton Trans. 43, no. 35 (2014): 13219–31. http://dx.doi.org/10.1039/c4dt01583e.

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Tetrasubstituted alkenes bearing geminal 2-indenyl substituents were synthesized and metallated to form a new class of ansa titanium and zirconium metallocene complexes containing a single sp<sup>2</sup>-hybridized carbon bridge.

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2

Brown, RFC, and AJ Robinson. "A Synthetic Approach to (±)-Tridentoquinone." Australian Journal of Chemistry 48, no. 3 (1995): 515. http://dx.doi.org/10.1071/ch9950515.

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Synthesis of the ansa-bridged benzofuranquinone (�)- tridentoquinone (�)-(1) is approached by construction of a C4 methyl ketone chain at the 3-position of 6-bromo-4,5,7-trimethoxy-2,2-dimethyl-2,3-dihydrobenzofuran (10) and alkylation at its 6-position leading after modification to a dimethyl C10 aldehydic chain. Closure of the ansa bridge by McMurry coupling of the aldehyde and ketone groups of the intermediate (33) with C8K/TiCl3 appears to occur, but in poor yield and with uncertain stereochemistry, and the synthesis has not been completed.

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3

Antiñolo, Antonio, Rafael Fernández-Galán, Noelia Molina, Antonio Otero, Iván Rivilla, and Ana M. Rodríguez. "New alkenyl-substituted group 4 C-ansa-metallocene complexes. Reactivity of the substituent at the carbon ansa bridge." Journal of Organometallic Chemistry 694, no. 13 (2009): 1959–70. http://dx.doi.org/10.1016/j.jorganchem.2009.01.038.

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4

Liu, Li-Kai, Yumin Dai, Heba Abdelwahab, Pablo Sobrado, and John J. Tanner. "Structural Evidence for Rifampicin Monooxygenase Inactivating Rifampicin by Cleaving Its Ansa-Bridge." Biochemistry 57, no. 14 (2018): 2065–68. http://dx.doi.org/10.1021/acs.biochem.8b00190.

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5

HERRMANN, G. S., H. G. ALT, and M. D. RAUSCH. "ChemInform Abstract: ansa-Titanocene and Zirconocene Complexes with Asymmetrically Substituted Carbon Bridge." ChemInform 22, no. 16 (2010): no. http://dx.doi.org/10.1002/chin.199116217.

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6

Rieger, Bernhard, Gerhard Jany, Manfred Steimann, and Riad Fawzi. "Synthesis of Ethylene Bridged Biscyclopentadiene Ligand Precursor Compounds and Some of their ansa-Zirconocene Derivatives via Chiral Epoxides: A Synthetic Strategy of High Variability." Zeitschrift für Naturforschung B 49, no. 4 (1994): 451–58. http://dx.doi.org/10.1515/znb-1994-0404.

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The chiral ligand precursor systems [1-Cp1-R1-2-R2-2-Cp2]ethane 5a-d bearing two different cyclopentadienyl fragments (Cp1, Cp2 = Cp, Ind, Flu) and a variable bridge substitution pattern (R1, R2=H, Ph, cyclopentyl, cyclohexyl) were prepared starting from the corresponding epoxides. The solid state structures of six organic intermediates are reported in order to prove the stereochemistry of the ligand forming reactions. Treatment of the dilithio salts of 5a-d with ZrCl4 in CH2Cl2 afforded chiral ansa-zirconocene dichlorides (6a-d).

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7

Atovmyan, Lev, Shaen Mkoyan, Igor Urazowski, et al. "Novel Chiral ansa-Metallocene Complexes of Titanium and Zirconium with a Semirigid Bridge." Organometallics 14, no. 5 (1995): 2601–4. http://dx.doi.org/10.1021/om00005a070.

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8

Kozikowski, Alan P., and Yan Xia. "Synthetic studies of the rubradirins. A strategy for the incorporation of the ansa bridge." Journal of Organic Chemistry 52, no. 7 (1987): 1375–78. http://dx.doi.org/10.1021/jo00383a047.

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9

Nifant'ev, I. E., A. V. Churakov, I. F. Urazowski, Sh G. Mkoyan, and L. O. Atovmyan. "ansa-Metallocene derivatives of TiIV and ZrIV with the shortest C(CH3)2 bridge." Journal of Organometallic Chemistry 435, no. 1-2 (1992): 37–42. http://dx.doi.org/10.1016/0022-328x(92)83458-t.

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10

Shapiro, Pamela J. "The evolution of the ansa-bridge and its effect on the scope of metallocene chemistry." Coordination Chemistry Reviews 231, no. 1-2 (2002): 67–81. http://dx.doi.org/10.1016/s0010-8545(02)00114-5.

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11

Prashar, Sanjiv, Antonio Antiñolo, and Antonio Otero. "Insights into group 4 and 5 ansa-bis(cyclopentadienyl) complexes with a single-atom bridge." Coordination Chemistry Reviews 250, no. 1-2 (2006): 133–54. http://dx.doi.org/10.1016/j.ccr.2005.05.017.

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12

Soga, Kazuo, Hoang The Ban, and Toshiya Uozumi. "Synthesis of a dinuclear ansa-zirconocene catalyst having a biphenyl bridge and application to ethene polymerization." Journal of Molecular Catalysis A: Chemical 128, no. 1-3 (1998): 273–78. http://dx.doi.org/10.1016/s1381-1169(97)00180-5.

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13

Rau, A., T. Wieczorek, H. Dornik, and G. Luft. "ansa-Zirconocenes with Bridge-tethered Donors: Synthesis and Application as Catalysts in Solution Polymerization of Ethylene." Chemical Engineering & Technology 36, no. 2 (2013): 339–46. http://dx.doi.org/10.1002/ceat.201200393.

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14

Tolpygin, A. O., A. V. Cherkasov, G. K. Fukin, and A. A. Trifonov. "Yttrium and ytterbium(III) complexes with ansa-linked bis(amidinate) ligand containing conformationally rigid o-phenylene bridge." Russian Chemical Bulletin 63, no. 10 (2014): 2299–304. http://dx.doi.org/10.1007/s11172-014-0738-9.

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15

Shin, Jun Ho, та Gerard Parkin. "The ansa-effect in permethyltantalocene chemistry: a [Me2Si] ansa bridge promotes olefin-insertion and reductive-elimination reactions for [Me2Si(C5Me4)2]Ta(η2-C2H4)H and [Me2Si(C5Me4)2]TaH3". Chemical Communications, № 10 (1999): 887–88. http://dx.doi.org/10.1039/a900895k.

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16

Damrau, Wulf-Erich, Gino Paolucci, Jacopo Zanon, Eric Siebel та R. Dieter Fischer. "[Y{2,6-(C5H4CH2)2C5H3N}(μ-OH)]2: a dinuclear 5-ansa-yttiocene hydroxide containing the 2,6-dimethylenepyridyl bridge". Inorganic Chemistry Communications 1, № 11 (1998): 424–26. http://dx.doi.org/10.1016/s1387-7003(98)00113-0.

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17

Zachmanoglou, C. E., H. Lee, S. H. Jang, K. Pang, and G. Parkin. "Silicon-Carbon bond cleavage reactions of Ansa tungstenocene compounds: The [Me2Si] bridge as a site for metallocene functionalization." Proceedings of the National Academy of Sciences 105, no. 32 (2008): 11060–65. http://dx.doi.org/10.1073/pnas.0803089105.

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18

Mansel, Stefan, Ursula Rief, Marc-Heinrich Prosenc, Robin Kirsten, and Hans-Herbert Brintzinger. "ansa-Metallocene derivatives XXXII. Zirconocene complexes with a spirosilane bridge: syntheses, crystal structures and properties as olefin polymerization catalysts." Journal of Organometallic Chemistry 512, no. 1-2 (1996): 225–36. http://dx.doi.org/10.1016/0022-328x(95)06073-6.

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19

Rigby, James H., and Kevin R. Fales. "Higher-order cycloaddition reactions in synthesis. Asymmetric assembly of the C5C11 segment of the ansa bridge of streptovaricin D." Tetrahedron Letters 39, no. 32 (1998): 5717–20. http://dx.doi.org/10.1016/s0040-4039(98)01183-6.

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20

Kim, Seong Heon, Israel Figueroa (in part), and P. L. Fuchs. "Application of the grubbs ring-closing metathesis for the construction of a macrocyclic ansa-bridge. Synthesis of the tricyclic core of roseophilin." Tetrahedron Letters 38, no. 15 (1997): 2601–4. http://dx.doi.org/10.1016/s0040-4039(97)00424-3.

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21

Urazowski, Igor F., Lev O. Atovmyan, Shaen G. Mkoyan та ін. "Novel group 4b ansa-metallocene complexes with the shortest bridge: [1,1′-isopropylydene-3,3′-di-t.Bu-bis(η5-cyclopentadienyl)] Ti and Zr dichlorides". Journal of Organometallic Chemistry 536-537 (травень 1997): 531–36. http://dx.doi.org/10.1016/s0022-328x(96)06859-3.

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22

Gagnon, Alexandre, and Samuel J. Danishefsky. "Evaluation of Diene Hierarchies for Diels-Alder Reactions En Route to Xestocyclamine A: Elaboration of an Ansa Bridge byB-Alkyl Suzuki Macrocyclization." Angewandte Chemie International Edition 41, no. 9 (2002): 1581–84. http://dx.doi.org/10.1002/1521-3773(20020503)41:9<1581::aid-anie1581>3.0.co;2-f.

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23

Gagnon, Alexandre, and Samuel J. Danishefsky. "Evaluation of Diene Hierarchies for Diels��Alder Reactions En Route to Xestocyclamine A: Elaboration of an Ansa Bridge byB-Alkyl Suzuki Macrocyclization." Angewandte Chemie International Edition 41, no. 17 (2002): 3085. http://dx.doi.org/10.1002/1521-3773(20020902)41:17<3085::aid-anie3085>3.0.co;2-4.

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24

Gagnon, Alexandre, and Samuel J. Danishefsky. "Evaluation of Diene Hierarchies for Diels-Alder Reactions En Route to Xestocyclamine A: Elaboration of an Ansa Bridge byB-Alkyl Suzuki Macrocyclization." Angewandte Chemie 114, no. 9 (2002): 1651–54. http://dx.doi.org/10.1002/1521-3757(20020503)114:9<1651::aid-ange1651>3.0.co;2-#.

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25

Gagnon, Alexandre, and Samuel J. Danishefsky. "Evaluation of Diene Hierarchies for Diels��Alder Reactions En Route to Xestocyclamine A: Elaboration of an Ansa Bridge byB-Alkyl Suzuki Macrocyclization." Angewandte Chemie 114, no. 17 (2002): 3214. http://dx.doi.org/10.1002/1521-3757(20020902)114:17<3214::aid-ange3214>3.0.co;2-e.

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26

RIGBY, J. H., and K. R. FALES. "ChemInform Abstract: Higher-Order Cycloaddition Reactions in Synthesis. Asymmetric Assembly of the C5-C11 Segment of the Ansa Bridge of Streptovaricin D." ChemInform 29, no. 43 (2010): no. http://dx.doi.org/10.1002/chin.199843273.

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27

Izmer, Vyacheslav V., Anton Y. Agarkov, Valentina M. Nosova та ін. "ansa-Metallocenes with a Ph2Si bridge: molecular structures of HfCl2[Ph2Si(η5-C13H8)(η5-C5H4)] and HfCl2[Ph2Si(C13H9)(η5-C5H4)]2†". Journal of the Chemical Society, Dalton Transactions, № 7 (2001): 1131–36. http://dx.doi.org/10.1039/b009280k.

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28

Wang, Huajin, Yanqing Li, and Zhengguo Cai. "Substituent Effects of Phenyl Group on Silylene Bridge in Stereospecific Polymerization of Propylene with C1-Symmetric Ansa-Silylene(fluorenyl)(amido) Dimethyl Titanium Complexes." Polymers 10, no. 10 (2018): 1075. http://dx.doi.org/10.3390/polym10101075.

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A C1-symmetric (methylphenyl)silylene-bridged (fluorenyl)(naphthylamido) titanium complex (1) and (diphenyl)silylene-bridged (fluorenyl)(naphthylamido) titanium complex (2) were synthesized and characterized by 1H NMR, element analysis, and X-ray crystal analysis. The coordination mode of the fluorenyl ligand to the titanium metal is an η3 manner in each complex. These complexes were applied for propylene polymerization using dried modified methyaluminoxane (dMMAO) as a cocatalyst under different propylene pressures in a semi batch-type method. The catalytic activity was strongly dependent on

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29

Rieger, Bernhard, Gerhard Jany, Riad Fawzi, and Manfred Steimann. "Unsymmetric ansa-Zirconocene Complexes with Chiral Ethylene Bridges: Influence of Bridge Conformation and Monomer Concentration on the Stereoselectivity of the Propene Polymerization Reaction." Organometallics 13, no. 2 (1994): 647–53. http://dx.doi.org/10.1021/om00014a041.

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30

Barsties, Elke, Stefan Schaible, Marc-Heinrich Prosenc, et al. "ansa-Metallocene derivatives XXXIII. 2-Dimethylamino-substituted bis-indenyl zirconium dichloride complexes with and without a dimethylsilyl bridge: syntheses, crystal structures and properties in propene polymerization catalysis." Journal of Organometallic Chemistry 520, no. 1-2 (1996): 63–68. http://dx.doi.org/10.1016/0022-328x(96)06263-8.

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31

Khvostov, A. V., V. V. Nesterov, B. M. Bulychev, A. I. Sizov та M. Yu Antipin. "ansa-Ytterbocene(III) chloride and borohydride with a short bridge and bulky substituents: synthesis and crystal structures of [meso-(CH3)2Si[3-(CH3)3SiC5H3]2Yb(μ2-Cl)]2 and meso-(CH3)2Si[3-(CH3)3SiC5H3]2Yb[(μ2-H)3BH](THF)". Journal of Organometallic Chemistry 589, № 2 (1999): 222–25. http://dx.doi.org/10.1016/s0022-328x(99)00405-2.

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32

Khvostov, Alexei V., Vitalii K. Belsky, Boris M. Bulychev, Alexandr I. Sizov та Boris B. Ustinov. "ansa-Ytterbocenes(+3) with a short bridge and bulky substituents: synthesis and crystal structure of meso-(CH3)2Si[3-(CH3)3SiC5H3]2YbCl(THF), rac-(CH3)2C[3-tBuC5H3]2Yb(μ2-Cl)2Li(OEt2)2, and [meso-(CH3)2C[3-tBuC5H3]2Yb(μ2-OCH3)]2". Journal of Organometallic Chemistry 571, № 2 (1998): 243–49. http://dx.doi.org/10.1016/s0022-328x(98)00822-5.

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33

Lee, Hyosun, Brian M. Bridgewater, and Gerard Parkin. "Influence of a [Me2Si] ansa bridge on the barrier to rotation about the Zr–phenyl bond and on the generation and reactivity of benzyne intermediates: comparison of the structures and reactivity of [Me2Si(C5Me4)2]Zr(Ph)X and Cp*2Zr(Ph)X (X = H, Cl, Ph)." Journal of the Chemical Society, Dalton Transactions, no. 24 (2000): 4490–93. http://dx.doi.org/10.1039/b005117i.

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34

KOZIKOWSKI, A. P., and Y. XIA. "ChemInform Abstract: Synthetic Studies of the Rubradirins: A Strategy for the Incorporation of the Ansa Bridge." ChemInform 18, no. 41 (1987). http://dx.doi.org/10.1002/chin.198741365.

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