Syndiotactic polymerization of styrene with CpTiCl2(OR)/MAO system

CpTiCl2(OR) (R=Cyclohexyl, CH2Ph, C6H4-But-p, nBu, iBu, CH2CHCH2) are synthesized, characterized and tested as syndiotactic polymerization catalysts of styrene. The structure and nature of the R group has a great effect on the activity of catalysts. Unsaturated groups and the conjugation of unsaturated groups with oxygen result in the drop of activity; while a more hindered R group increases activity.