Synthesis, Characterization and Monoalkene Polymerization Activity of Bis-[(1,2,3,4-tetraphenyl)-η<sup>5</sup>-cyclopentadienyl]zirconium(IV) Dichloride

Conti, Giuseppe; Arribas, Guillermo; Altomare, Angelina; Méndez, Bernardo; Ciardelli, Francesco

doi:10.1515/znb-1995-0315

Cited by 9 publications

(1 citation statement)

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“…The activity of the zirconocene catalyst (75 × 10 3 g/g Zr h) comprising the methyl substituted ligand is significantly lower than the complexes consisting of phenyl substituted ligands (372 × 10 3 g/g Zr h). This behavior was explained by the steric and resonance effects of the phenyl substituents on the “bulky” cyclopentadienyl ligand …”

Section: Catalysts Based On Heterogenized Zirconium Complexesmentioning

confidence: 99%

Zirconium Catalyzed Ethylene Oligomerization

Khamiyev

Khanmetov

Vakhshouri

et al. 2020

Applied Organom Chemis

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A review of the scientific and patent literature on oligomerization of ethylene to linear olefins in the presence of homogenous or heterogeneous zirconium complexes and various aluminum organic compounds has been fulfilled for last twenty‐five years. Over these years, a wide range of studies had been conducted for selective oligomerization of ethylene into a narrow fraction of linear α‐olefins such as C4‐C8 and C6‐C10 fractions. During the discussion of these catalytic systems, exceptional attention is also paid to feature works such as the activity of the catalysts and the acquisition of clear liquid product without any trace of polymer, all of which play important roles in the selection of the best technology.

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Section: Catalysts Based On Heterogenized Zirconium Complexesmentioning

confidence: 99%

Zirconium Catalyzed Ethylene Oligomerization

Khamiyev

Khanmetov

Vakhshouri

et al. 2020

Applied Organom Chemis

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Metallocene Catalysts

Janiak

2002

Kirk-Othmer Encyclopedia of Chemical Technology

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Metallocene catalysts refer to the combination of bis(cyclopentadienyl)metal complexes of Group 4 (IVB) (especially zirconium), or cyclopentadienyl‐substituted derivatives thereof, and a cocatalyst, typically methylalumoxane (MAO) or a perfluorated arylborane. Metallocene catalysts are employed in olefin polymerization as a new generation of Ziegler–Natta catalysts. The single‐site character of the active species enables the syntheses of polymers with narrow molar mass, comonomer distribution and tacticity distribution as industrially important features. Through a rational substitution pattern at the cyclopentadienyl ligands, metallocene catalysts allow for a unprecedented control and variation of the tacticity in α‐olefin polymerization. Furthermore, metallocene catalysts made the polymerization of cyclic olefins without ring opening possible.

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