Výsledky vyhledávání - "and Ursula Rief"

Immobilized Me2Si(C5Me4)(N-tBu)TiCl2/(nBuCp)2ZrCl2 hybrid metallocene catalyst system for the production of poly(ethylene-co-hexene) with pseudo-bimodal molecular weight and inverse comonomer distribution

Autor: Shahram Mihan, Ursula Rief, Sung Chul Hong, Lourant Delux, Dieter Lilge

Publikováno v: Polymer Engineering & Science. 47:131-139

Me2Si(C5Me4)(N-tBu)TiCl2, (nBuCp)2ZrCl2, and Me2Si(C5Me4)(N-tBu)TiCl2/(nBuCp)2ZrCl2 catalyst systems were successfully immobilized on silica and applied to ethylene/hexene copolymerization. In the presence of 20 mL of hexene and 25 mg of butyloctyl m

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::e6ca065fb5e716cc02e270d6d7a207f4
https://doi.org/10.1002/pen.20682

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Ethylene polymerization using crosslinked polystyrene as support for zirconocene dichloride/methylaluminoxane

Autor: Markus Klapper, Klaus Müllen, Matthias Koch, Martin Stork, Ursula Rief, Heike Gregorius

Publikováno v: Macromolecular Rapid Communications. 20:210-213

In this paper we report on a zirconocene dichloride/methylaluminoxane catalyst system supported on a crosslinked polystyrene in order to provide ethylene polymerization catalysts for gas phase or slurry processes. Our novel approach uses the Diels-Al

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c08fa88a35a0463aaec995b92913f6d4
https://doi.org/10.1002/(sici)1521-3927(19990401)20:4<210::aid-marc210>3.0.co

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ansa-metallocene derivatives XXXIX biphenyl-bridged metallocene complexes of titanium, zirconium, and vanadium: Syntheses, crystal structures and enantioseparation

Autor: Monika E. Huttenloch, Ursula Rief, Birgit Dorer, Katrin Schmidt, Marc-Heinrich Prosenc, Hans-Herbert Brintzinger

Publikováno v: Journal of Organometallic Chemistry. 541:219-232

Chiral, biphenyl-bridged metallocene complexes of general type biph(3,4-R2C5H2)2MCl2 (biph = 1,1'-biphenyldiyl) were synthesized and characterized. For the dimethyl-substituted titanocenes and zirconocenes (R = CH3; M = Ti, Zr), preparations with inc

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d1aa7fed0eef14220c041b58e40e34e3
https://doi.org/10.1016/s0022-328x(97)00064-8

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Photochemical Isomerization of Me2Si-Bridged Zirconocene Complexes. Application to Stereoselective Syntheses of ansa-Zirconocene Binaphtholate Stereoisomers,1

Autor: Hans-Herbert Brintzinger, Annette Reinmuth, Ursula Rief, Katrin Schmidt, Josef Diebold

Publikováno v: Organometallics. 16:1724-1728

Upon irradiation in toluene solution, meso-racemate mixtures of Me2Si(2-Me-4-tBu-C5H2)2ZrCl2 or Me2Si(2-Me-4-phenyl-C5H2)2ZrCl2 react with 1 equiv of the dilithium salt of racemic binaphthol quanti...

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::17a748fb0cdf63a7be0d7fd4c1d6d4c5
https://doi.org/10.1021/om961089d

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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

Autor: Hans-Herbert Brintzinger, Werner Röll, Ursula Rief, Elke Barsties, Stefan Schaible, Oliver Weyand, Marc-Heinrich Prosenc, Birgit Dorer

Publikováno v: Journal of Organometallic Chemistry. 520:63-68

Bis(2-N,N-dimethylamino-indenyl) zirconium dichloride, (2-(CH3)2N-C9H6)2ZrCl2, and dimethylsilyl-bridged bis(2-N,N-dimethylamino-indenyl) zirconium dichloride, (CH3)2Si(2-(CH3)2N-C9H5)2ZrCl2, were prepared by reaction of the corresponding ligand lith

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e48d231ed1e9ba8436c5fd6b34e64be6
https://doi.org/10.1016/0022-328x(96)06263-8

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ansa-Metallocene derivatives XXXII. Zirconocene complexes with a spirosilane bridge: syntheses, crystal structures and properties as olefin polymerization catalysts

Autor: Ursula Rief, Hans-Herbert Brintzinger, Stefan Dipl Chem Mansel, Robin Kirsten, Marc-Heinrich Prosenc

Publikováno v: Journal of Organometallic Chemistry. 512:225-236

Chiral ansa-zirconocene complexes with a trimethylene link between the Si bridge atom and an α-position of each C5 ring ligand were prepared; two representatives, with i-propyl and t-butyl groups as β-substituents, were structurally characterized.

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cdb1a65405ca0b5869458f01da372e17
https://doi.org/10.1016/0022-328x(95)06073-6

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Zirconium-91 Chemical Shifts and Line Widths as Indicators of Coordination Geometry Distortions in Zirconocene Complexes

Autor: Wolfgang von Philipsborn, and Gudrun Hopp, Stefan Beck, Marc-Heinrich Prosenc, Michael Bühl, and Ursula Rief, Hans-Herbert Brintzinger

Publikováno v: Organometallics. 15:778-785

91Zr NMR chemical shifts and line widths (Δν1/2) are reported for a number of ring-bridged and ring-substituted zirconocene dichloride, dibromide, and dimethyl complexes. Ab initio computations at the SCF level employing basis sets of moderate size

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::ef14a7ccbc3e75783a6c0c77da1750d1
https://doi.org/10.1021/om950757c

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Syntheses and X-ray Structures of Anionic Sodocene Sandwiches

Autor: Ursula Rief, Marc-Heinrich Prosenc, Sjoerd Harder

Publikováno v: Organometallics. 15:118-122

While, the lithocene anion (Cp2Li-) can simply be generated by reacting 2 equiv of CpLi with PPh4Cl in THF, the attempted synthesis of the sodocene anion under similar reaction conditions results in the crystallization of [Cp-][PPh4+]. The structure

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::ae39ca12752ca3c32543db5f2959c6bd
https://doi.org/10.1021/om950571d

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