Oxidation State(s) of the Active Titanium Species during Polymerization of Styrene to Syndiotactic Polystyrene Catalyzed by CpTiMe3/B(C6F5)3, CpTiMe3/[Ph3C][B(C6F5)4], and CpTiCl2,3/MAO

A combined NMR/EPR investigation of the catalyst systems Cp*TiMe3/B(C6F5)3, Cp*TiMe3/[Ph3C][B(C6F5)4], and Cp*TiCl2,3/MAO for the polymerization of styrene to syndiotactic polystyrene suggests that evidence for the involvement of EPR-active titanium(III) species as catalysts is ambiguous.

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Bibliographic Details
Published in:Macromolecules 2000-01, Vol.33 (2), p.261-268
Main Authors: Williams, Edan F, Murray, Michael C, Baird, Michael C
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Organic polymers
Physicochemistry of polymers
Polymerization
Preparation, kinetics, thermodynamics, mechanism and catalysts
Online Access:Get full text
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Summary:A combined NMR/EPR investigation of the catalyst systems Cp*TiMe3/B(C6F5)3, Cp*TiMe3/[Ph3C][B(C6F5)4], and Cp*TiCl2,3/MAO for the polymerization of styrene to syndiotactic polystyrene suggests that evidence for the involvement of EPR-active titanium(III) species as catalysts is ambiguous.
ISSN:0024-9297
1520-5835
DOI:10.1021/ma991006f