Unusual synergetic effect of cocatalysts in the polymerization of propylene by a zirconium bis(benzamidinate) dimethyl complex

Victoria Volkis; Boris Tumanskii; Moris S. Eisen

doi:10.1021/om0602815

Unusual synergetic effect of cocatalysts in the polymerization of propylene by a zirconium bis(benzamidinate) dimethyl complex

Victoria Volkis, Boris Tumanskii, Moris S. Eisen^*

^*Corresponding author for this work

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

29 Scopus citations

Abstract

The zirconium benzamidinate dimethyl complex [PhC(NSiMe₃) ₂]₂Zr(Me)₂ (1) was activated by a mixture of trityl tetrakispentafluorophenylborate (TTPB) and a small amount of methylalumoxane (MAO) (Zr:B:Al = 1:1:50), forming an extremely active catalytic system for the polymerization of olefins, producing high-density polyethylene and elastomeric polypropylene with a narrow MWD. This catalytic system rivals the activity of the best nonmetallocene systems and approaches the activities of the best metallocene complexes. Single active sites are obtained only after the addition of propylene. A plausible activation mechanism is proposed, which is corroborated by NMR, ESR spectroscopy, radical trapping on fullerene, and MALDI-TOF mass spectroscopy experiments.

Original language	English
Pages (from-to)	2722-2724
Number of pages	3
Journal	Organometallics
Volume	25
Issue number	11
DOIs	https://doi.org/10.1021/om0602815
State	Published - 22 May 2006
Externally published	Yes

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title = "Unusual synergetic effect of cocatalysts in the polymerization of propylene by a zirconium bis(benzamidinate) dimethyl complex",

abstract = "The zirconium benzamidinate dimethyl complex [PhC(NSiMe3) 2]2Zr(Me)2 (1) was activated by a mixture of trityl tetrakispentafluorophenylborate (TTPB) and a small amount of methylalumoxane (MAO) (Zr:B:Al = 1:1:50), forming an extremely active catalytic system for the polymerization of olefins, producing high-density polyethylene and elastomeric polypropylene with a narrow MWD. This catalytic system rivals the activity of the best nonmetallocene systems and approaches the activities of the best metallocene complexes. Single active sites are obtained only after the addition of propylene. A plausible activation mechanism is proposed, which is corroborated by NMR, ESR spectroscopy, radical trapping on fullerene, and MALDI-TOF mass spectroscopy experiments.",

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T1 - Unusual synergetic effect of cocatalysts in the polymerization of propylene by a zirconium bis(benzamidinate) dimethyl complex

AU - Volkis, Victoria

AU - Tumanskii, Boris

AU - Eisen, Moris S.

PY - 2006/5/22

Y1 - 2006/5/22

N2 - The zirconium benzamidinate dimethyl complex [PhC(NSiMe3) 2]2Zr(Me)2 (1) was activated by a mixture of trityl tetrakispentafluorophenylborate (TTPB) and a small amount of methylalumoxane (MAO) (Zr:B:Al = 1:1:50), forming an extremely active catalytic system for the polymerization of olefins, producing high-density polyethylene and elastomeric polypropylene with a narrow MWD. This catalytic system rivals the activity of the best nonmetallocene systems and approaches the activities of the best metallocene complexes. Single active sites are obtained only after the addition of propylene. A plausible activation mechanism is proposed, which is corroborated by NMR, ESR spectroscopy, radical trapping on fullerene, and MALDI-TOF mass spectroscopy experiments.

AB - The zirconium benzamidinate dimethyl complex [PhC(NSiMe3) 2]2Zr(Me)2 (1) was activated by a mixture of trityl tetrakispentafluorophenylborate (TTPB) and a small amount of methylalumoxane (MAO) (Zr:B:Al = 1:1:50), forming an extremely active catalytic system for the polymerization of olefins, producing high-density polyethylene and elastomeric polypropylene with a narrow MWD. This catalytic system rivals the activity of the best nonmetallocene systems and approaches the activities of the best metallocene complexes. Single active sites are obtained only after the addition of propylene. A plausible activation mechanism is proposed, which is corroborated by NMR, ESR spectroscopy, radical trapping on fullerene, and MALDI-TOF mass spectroscopy experiments.

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JO - Organometallics

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Unusual synergetic effect of cocatalysts in the polymerization of propylene by a zirconium bis(benzamidinate) dimethyl complex

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