A combined NMR/EPR investigation of the catalyst systems Cp*TiMe 3 /B(C 6 F 5 ) 3, Cp*TiMe 3 /[Ph 3 C][B(C 6 F 5 ) 4 ], and Cp*TiCl 2,3 /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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Williams et al. (1999) studied this question.
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