Summary
Both the pure anti (1) and an equimolar mixture of1 and the syn (2) diastereomers ofrac-[ethylidene(1-η 5-tetramethylcyclopentadienyl)(1-η 5-indenyl)titanium dichloride have been synthesized. The polymerization behaviors of the two systems, activated by methylaluminoxane (MAO), have been compared from -20°C to +25°C. The2/MAO catalyst has about 30% more active species, which polymerizes propylene 20 to 50% faster depending on T p , undergoes chain transfers less frequently, and produces PP of higher molecular weight than the1/MAO system.
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Llinas, G.H., Chien, J.C.W. Comparison of polymerization catalyzed by thesyn andanti diastereomers of [ethylidene(1-η 5-tetramethylcyclopentadienyl)(1-η 5-indenyl)]titanium dichloride and methylaluminoxane. Polymer Bulletin 28, 41–45 (1992). https://doi.org/10.1007/BF01045636
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DOI: https://doi.org/10.1007/BF01045636