Abstract
A New titanium catalyst bearing an aminodiol ligand was synthesized as racemic (C2), as meso, and as a diastereomeric mixture. The racemic catalyst (rac) produced isotactic polymer by enantiomorphic-site control mechanism whereas meso catalyst (meso) produced atactic oligomers. The rac and the diastereomeric catalyst (mix) produced polymers with single-site catalyst behavior at ambient temperatures. When the polymerization temperature was lowered, rac gave high molecular weight polyhexene with polydispersity value approaching close to a living system whereas the mix exhibited a latent bimodal behavior. meso produced just oligomers and did not show any change in behavior with polymerization temperature. Deliberate mixing of rac and meso produced two polyhexene fractions: high molecular weight polymer and oligomers indicating an independent behavior of the mixed catalyst.
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