Stereo- and Regioirregular High Molecular Weight Poly Higher a-Olefin s

Conditions 25 °C, atmospheric pressure, 20 min, monomer 0.211 mol, n-heptane 90 mL, pretreated solution of FI catalyst 2 (5 pmol)/i-Bu3A1 (0.15 mmol), Ph3CB(C6F3)4 6 pmol, i-Biykl 50 pmol akg polymer per mmol catalyst per h Determined by GPC 

Surprisingly, the polymerization rate has practically a zeroth-order dependence on the concentration of the monomer, which is a rare example for a group 4 metal-based catalyst. Although the reason for the zeroth-order dependence is unclear at the current time, one possible explanation is that, under the conditions examined, the cationic complex virtually exists as a (higher a-olefm)-coordinated form, presumably due to the highly electrophilic and sterically open nature of the cationic active species. 

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