The thulium complexes [Tm(Pr-i- trisox)(CH2SiMe2R)(3)] (R = Me 1a, Ph 1b) were synthesized from the thulium trialkyl precursors [Tm(CH2SiMe2R)(3)(thf)(2)]; reaction of 1a with two equivalents of [Ph3C][B(C6F5)(4)] gave a cationic complex 1c, which was found to polymerize 1-hexene, 1-heptene and 1-octene to give the corresponding polyolefins with moderate to good activities and with minimum isotacticity of 90%, 83% and 95%, respectively.
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