In NJV-dimethylaniline the ionic complexes [Cp*,MMe(THT)]+[BPhJ (M = Zr, Hf) oligomerize propene to low molecular weight oligomers. At room temperature for M = Zr a rather broad molecular weight distribution is obtained (c6 to C%), whereas for M = Hf only one dimer (4methyl-l-pentene) and one trimer (4,6-dimethyl-l-heptene) are formed. With an increase in reaction temperature the product composition shifts to lower molecular weights, but the specific formation of head-to-tail oligomers is retained. The oligomers are formed by &Me transfer from the growing oligopropene alkyl chain to the metal center. The molecular weight distributions of the oligomers produced at temperature between 5 and 45 OC are satisfactorily described by the Flory-Schulz theory. This allows the calculation of ratios of rate coefficients for propagation (k,) and termination (kJ. Values for (AG* -AG*t)298~ were calculated as -1.9 (3) and
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