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- W2181471036 abstract "The hydrogenation of rac-[1-(9-η 5 -fluorenyl)-2-(5,6-cylopenta-2-methyl-1-η 5 -indenyl)ethane] metallocene dichlorides (1a: Zr, 1b: Hf) with PtO 2 /H 2 O/H 2 is reported. The diastereoselective formation of exclusively rac-[1-(2,3,4,5,6,7,8,9-octahydro-η 5 -fluorenyl)-2-(2-methyl- 1,4,4a(R;S),5,6,7,7a(S;R),8-octahydro-s-η 5 -indacenyl)ethane]metallocene dichlorides (2a: Zr, 2b: Hf) was shown by 1 H-NMR and by X-ray analysis of 2a. Both compounds were activated in situ with triisobutylaluminum/PhC + 3 [B(C 6 F 5 ) 4 ]D and tested as catalysts in propylene polymerization reactions. Comparison to the non-hydrogenated complexes revealed a decrease in molecular weight of the polymer and in catalyst activity. Experiments at elevated temperatures resulted in a lower stereospecificity and reduced isotacticity values indicating a polymerization mechanism analogous to C 2 -symmetric catalysts." @default.
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- W2181471036 date "2003-06-01" @default.
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- W2181471036 title "Semi-Hydrogenated, Asymmetric Metallocene Catalysts for the Propylene Polymerization" @default.
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- W2181471036 doi "https://doi.org/10.1515/znb-2003-0608" @default.
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