Bis(trimethylsilyl) benzamidinate zirconium dichlorides. Active catalysts for ethylene polymerization

Dorit Herskovics-Korine; Moris S. Eisen

doi:10.1016/0022-328X(95)05576-B

Bis(trimethylsilyl) benzamidinate zirconium dichlorides. Active catalysts for ethylene polymerization

Dorit Herskovics-Korine, Moris S. Eisen^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

130 Scopus citations

Abstract

A study was made of the polymerization of ethylene involving the use of a series of [η⁴-4-RC₆H₄C(NSiMe₃)₂]₂ZrCl₂ as precatalysts (R = H (1); CH₃ (2)). The benzamidinate zirconium dichloride complexes were prepared from ZrCl₄ and the corresponding 4-RC₆H₄C(NSiMe₃)₂Li· TMEDA ligand. The structure of complex 1 was determined by a low-temperature X-ray diffraction study. "Cationic" ethylene polymerization catalysts were generated from 1 and 2 with methylalumoxane. The polymerization activity and the molecular weights of the polymers are strongly dependent on the catalyst and cocatalyst concentrations. The polymerization activity increases drastically with increase in pressure and temperature and decreases when electron-releasing groups are attached to the aromatic ring.

Original language	English
Pages (from-to)	307-314
Number of pages	8
Journal	Journal of Organometallic Chemistry
Volume	503
Issue number	2
DOIs	https://doi.org/10.1016/0022-328X(95)05576-B
State	Published - 15 Nov 1995
Externally published	Yes

Keywords

Benzaminidate
Crystal structure
Ziegler-Natta polymerization
Zirconium
Zirconocene

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10.1016/0022-328X(95)05576-B

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title = "Bis(trimethylsilyl) benzamidinate zirconium dichlorides. Active catalysts for ethylene polymerization",

abstract = "A study was made of the polymerization of ethylene involving the use of a series of [η4-4-RC6H4C(NSiMe3)2]2ZrCl2 as precatalysts (R = H (1); CH3 (2)). The benzamidinate zirconium dichloride complexes were prepared from ZrCl4 and the corresponding 4-RC6H4C(NSiMe3)2Li· TMEDA ligand. The structure of complex 1 was determined by a low-temperature X-ray diffraction study. {"}Cationic{"} ethylene polymerization catalysts were generated from 1 and 2 with methylalumoxane. The polymerization activity and the molecular weights of the polymers are strongly dependent on the catalyst and cocatalyst concentrations. The polymerization activity increases drastically with increase in pressure and temperature and decreases when electron-releasing groups are attached to the aromatic ring.",

keywords = "Benzaminidate, Crystal structure, Ziegler-Natta polymerization, Zirconium, Zirconocene",

author = "Dorit Herskovics-Korine and Eisen, {Moris S.}",

year = "1995",

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doi = "10.1016/0022-328X(95)05576-B",

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TY - JOUR

T1 - Bis(trimethylsilyl) benzamidinate zirconium dichlorides. Active catalysts for ethylene polymerization

AU - Herskovics-Korine, Dorit

AU - Eisen, Moris S.

PY - 1995/11/15

Y1 - 1995/11/15

N2 - A study was made of the polymerization of ethylene involving the use of a series of [η4-4-RC6H4C(NSiMe3)2]2ZrCl2 as precatalysts (R = H (1); CH3 (2)). The benzamidinate zirconium dichloride complexes were prepared from ZrCl4 and the corresponding 4-RC6H4C(NSiMe3)2Li· TMEDA ligand. The structure of complex 1 was determined by a low-temperature X-ray diffraction study. "Cationic" ethylene polymerization catalysts were generated from 1 and 2 with methylalumoxane. The polymerization activity and the molecular weights of the polymers are strongly dependent on the catalyst and cocatalyst concentrations. The polymerization activity increases drastically with increase in pressure and temperature and decreases when electron-releasing groups are attached to the aromatic ring.

AB - A study was made of the polymerization of ethylene involving the use of a series of [η4-4-RC6H4C(NSiMe3)2]2ZrCl2 as precatalysts (R = H (1); CH3 (2)). The benzamidinate zirconium dichloride complexes were prepared from ZrCl4 and the corresponding 4-RC6H4C(NSiMe3)2Li· TMEDA ligand. The structure of complex 1 was determined by a low-temperature X-ray diffraction study. "Cationic" ethylene polymerization catalysts were generated from 1 and 2 with methylalumoxane. The polymerization activity and the molecular weights of the polymers are strongly dependent on the catalyst and cocatalyst concentrations. The polymerization activity increases drastically with increase in pressure and temperature and decreases when electron-releasing groups are attached to the aromatic ring.

KW - Benzaminidate

KW - Crystal structure

KW - Ziegler-Natta polymerization

KW - Zirconium

KW - Zirconocene

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U2 - 10.1016/0022-328X(95)05576-B

DO - 10.1016/0022-328X(95)05576-B

M3 - 文章

AN - SCOPUS:0011684583

SN - 0022-328X

VL - 503

SP - 307

EP - 314

JO - Journal of Organometallic Chemistry

JF - Journal of Organometallic Chemistry

IS - 2

ER -

Bis(trimethylsilyl) benzamidinate zirconium dichlorides. Active catalysts for ethylene polymerization

Abstract

Keywords

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