Synthesis and characterization of dichlorotitanium alkoxide complex and its activity in the polymerization of α-olefins

Tal Gueta-Neyroud; Boris Tumanskii; Moshe Kapon; Moris S. Eisen

doi:10.1021/ma070771o

Synthesis and characterization of dichlorotitanium alkoxide complex and its activity in the polymerization of α-olefins

Tal Gueta-Neyroud, Boris Tumanskii, Moshe Kapon, Moris S. Eisen^*

^*Corresponding author for this work

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

20 Scopus citations

Abstract

We present the synthesis, characterization, X-ray molecular structure, and catalytic activity of a [(HOEt)Ti(μ-OEt)OEt(Cl)₂]₂ (1) dimeric complex. Complex 1 was found to undergo, in solution, a succession of fluxional processes involving the rotation of the ligands, rapid exchange between the anionic ethoxide ligands, and exchange of the hydroxylic hydrogen. The complex, when activated by methylalumoxane (MAO), undergoes an abstraction of the ligands through a heterobimetallic intermediate with ethoxide bridges between the aluminum and titanium atoms. We propose that this intermediate is the active species in the polymerization of α-olefins. The complex displays unexpectedly a single site behavior in contradiction to other titanium alkoxide complexes. The resulting polymers were found to show elastomeric properties with intermediate tacticities.

Original language	English
Pages (from-to)	5261-5270
Number of pages	10
Journal	Macromolecules
Volume	40
Issue number	15
DOIs	https://doi.org/10.1021/ma070771o
State	Published - 24 Jul 2007
Externally published	Yes

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title = "Synthesis and characterization of dichlorotitanium alkoxide complex and its activity in the polymerization of α-olefins",

abstract = "We present the synthesis, characterization, X-ray molecular structure, and catalytic activity of a [(HOEt)Ti(μ-OEt)OEt(Cl)2]2 (1) dimeric complex. Complex 1 was found to undergo, in solution, a succession of fluxional processes involving the rotation of the ligands, rapid exchange between the anionic ethoxide ligands, and exchange of the hydroxylic hydrogen. The complex, when activated by methylalumoxane (MAO), undergoes an abstraction of the ligands through a heterobimetallic intermediate with ethoxide bridges between the aluminum and titanium atoms. We propose that this intermediate is the active species in the polymerization of α-olefins. The complex displays unexpectedly a single site behavior in contradiction to other titanium alkoxide complexes. The resulting polymers were found to show elastomeric properties with intermediate tacticities.",

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T1 - Synthesis and characterization of dichlorotitanium alkoxide complex and its activity in the polymerization of α-olefins

AU - Gueta-Neyroud, Tal

AU - Tumanskii, Boris

AU - Kapon, Moshe

AU - Eisen, Moris S.

PY - 2007/7/24

Y1 - 2007/7/24

N2 - We present the synthesis, characterization, X-ray molecular structure, and catalytic activity of a [(HOEt)Ti(μ-OEt)OEt(Cl)2]2 (1) dimeric complex. Complex 1 was found to undergo, in solution, a succession of fluxional processes involving the rotation of the ligands, rapid exchange between the anionic ethoxide ligands, and exchange of the hydroxylic hydrogen. The complex, when activated by methylalumoxane (MAO), undergoes an abstraction of the ligands through a heterobimetallic intermediate with ethoxide bridges between the aluminum and titanium atoms. We propose that this intermediate is the active species in the polymerization of α-olefins. The complex displays unexpectedly a single site behavior in contradiction to other titanium alkoxide complexes. The resulting polymers were found to show elastomeric properties with intermediate tacticities.

AB - We present the synthesis, characterization, X-ray molecular structure, and catalytic activity of a [(HOEt)Ti(μ-OEt)OEt(Cl)2]2 (1) dimeric complex. Complex 1 was found to undergo, in solution, a succession of fluxional processes involving the rotation of the ligands, rapid exchange between the anionic ethoxide ligands, and exchange of the hydroxylic hydrogen. The complex, when activated by methylalumoxane (MAO), undergoes an abstraction of the ligands through a heterobimetallic intermediate with ethoxide bridges between the aluminum and titanium atoms. We propose that this intermediate is the active species in the polymerization of α-olefins. The complex displays unexpectedly a single site behavior in contradiction to other titanium alkoxide complexes. The resulting polymers were found to show elastomeric properties with intermediate tacticities.

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Synthesis and characterization of dichlorotitanium alkoxide complex and its activity in the polymerization of α-olefins

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