Nature of the Active Sites in Soluble Ziegler-Polymerization Catalysts Generated from Titanocene Halides and Organoaluminum Lewis Acids
That the active site in Ziegler-Natta polymerization catalysts is the transition metal-carbon bond receives strong support from the finding that pure transition metal alkyls, such as tetrabenzyltitanium , can themselves polymerize ethylene and propylene, even in the complete absence of any main-group alkyl. However, it is also evident that combinations of transition-metal salts or organometallics with main-group alkyls often display greatly enhanced catalytic activity and stereoregular polymerization in such processes . The isotactic polymerization of propylene by TiCl3 and Et2AlCl  and the greatly accelerated polymerization of ethylene by Cp2ZrMe2 and (MeAlO)n  are cases in point.
KeywordsTitanium Silane Hexane Propylene Ketone
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