Macromolecules, Vol.33, No.2, 261-268, 2000
Oxidation state(s) of the active titanium species during polymerization of styrene to syndiotactic polystyrene catalyzed by Cp*TiMe3/B(C6F5)(3), Cp*TiMe3[Ph3C][B(C6F5)(4)], and Cp*TiCl2,3/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.
Keywords:ELECTRON-SPIN-RESONANCE;SYNDIOSPECIFIC POLYMERIZATION;METHYLALUMINOXANE CATALYSTS;COMPLEXES;PHOTOLYSIS;DICHLORIDE;ETHYLENE;LIGANDS