Modified half-titanocenes

Scheme 5.6 Other modified half-titanocenes employed for ethylene/styrene copolymerization [14,15].

Based on the above results, modified half-titanocenes, Cp"Ii(L)X2, are better catalyst precursors for the synthesis of ethylene/styrene copolymers with high yields, and both the activity and the styrene incorporation are highly dependent upon the kind of ligands used (both cyclopentadienyl and anionic donor). These complexes are also effective not only for ethylene polymerization but also for syndiospecific styrene polymerization, and the results stand in unique contrast to those with ordinary half-titanocenes, Cp TiXs [9-12], These catalysts may be suitable for mechanistic study on syndiospecific styrene polymerization as well as copolymerization. 

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