نتایج جستجو برای: metallocene catalyst

تعداد نتایج: 44388  

2004
Martin Schlögl Bernhard Rieger

The synthesis of a series of C1-symmetric metallocene complexes rac-[1-(5,6-dialkoxy-2-methyl1-η5-indenyl)-2-(9-η5-fluorenyl)ethane]zirconium dichlorides (alkyl: n-butyl, n-hexyl, n-octyl, ndecyl) is described. These complexes are versatile catalysts in the polymerization of propylene after in situ activation with triisobutylaluminum (TIBA) and Ph3C[B(C6F5)4] in toluene and heptane solution. Al...

Journal: :Polymer 2022

The effect of blending a small amount high-density polyethylene (HDPE) on molecular entanglements during melt-drawing ultrahigh-molecular-weight (UHMW-PE) was investigated in this study. UHMW-PE powders with HDPE added and bimodal MW distribution were synthesized by reactor blending. In situ wide-angle X-ray diffraction small-angle scattering measurements UHMW-PE/HDPE films performed to evaluat...

Journal: :Dalton transactions 2013
Johannes Thomas Marcus Klahn Anke Spannenberg Torsten Beweries

A study of the full dehydrogenation of hydrazine borane (H2N-NH2·BH3) to give H2 and N2 as gaseous products catalysed by a variety of group 4 metallocene alkyne complexes of the type CpM(L)(η(2)-Me3SiC2SiMe3) (Cp' = substituted or unsubstituted η(5)-cyclopentadienyl; M = Ti, no L; M = Zr, L = pyridine) and group 4 metallocene hydrides is presented. Volumetric data show that the amount of hydrog...

Journal: :Organic & biomolecular chemistry 2011
Xiaohu Zhao Delong Liu Fang Xie Yangang Liu Wanbin Zhang

Palladium-catalyzed asymmetric allylic alkylation of ketones, via enamines generated in situ as nucleophiles, were carried out smoothly with chiral metallocene-based P,N-ligands. Under the same conditions, however, reactions of aldehydes could hardly be observed. Subsequently, this obstacle was resolved by using chiral metallocene-based P,P-ligands. Both ketones and aldehydes afforded excellent...

2013
Johann Hlina Judith Baumgartner Christoph Marschner Patrick Zark Thomas Müller

Reaction of the PEt3 adduct of a disilylated five-membered cyclic germylene with group 4 metallocene dichlorides in the presence of magnesium led to the formation of the respective germylene metallocene phosphine complexes of titanium, zirconium, and hafnium. Attempts to react the related NHC adduct of a disilylated four-membered cyclic germylene under the same conditions with Cp2TiCl2 did not ...

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