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Polypropene and poly(1-butene) have been synthesized under very similar experimental conditions with a series of MAO-activated C 2 -symmetric and C 1 -symmetric ansa-zirconocenes. The C 1 -symmetric zirconocenes bearing the bilaterally symmetric fluorenyl or bis(2-methylthieno)cyclopentadienyl ligand connected through a dimethylsilyl bridge to substituted indenyl ligands produce...
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