Abstract
Propene polymerization by Cp*2ZrMe(μ-Me)B(C6F5)3 in toluene under 1 atm propene in the temperature range −45 to 25 °C involves β-methyl migration as the primary mode of chain transfer, with β-hydrogen elimination playing a very minor role. Under propene-starved conditions, however, β-hydrogen elimination becomes competitive, and it is concluded that the concentration of free monomer has an effect on the mechanism of chain transfer. To rationalize these findings, it is suggested that β-methyl migration may involve transfer of the methyl group not to the metal, as has been previously thought, but to a coordinated propene.
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