Novel octahydro- and tetrahydro-fluorenyl containing C1 symmetric zirconocenes for the stereoregular polymerization of propylene

Journal of Organometallic Chemistry

Volumn 631, Issue 1-2, 2001, Pages 29-35

  Thomas, Emma J ^a   Rausch, Marvin D ^a   Chien, James C W ^a  

^a UNIVERSITY OF MASSACHUSETTS   (United States)

Author keywords

Asymmetric metallocenes; Isotactic polypropylene; Octahydrofluorenyl; Polymerization; Tetrahydrofluorenyl; Zirconocenes

Indexed keywords

EID: 0005156169     PISSN: 0022328X     EISSN: None     Source Type: Journal    
DOI: 10.1016/S0022-328X(01)01004-X     Document Type: Article

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29. We would like to thank a reviewer for the following insightful comments regarding an alternative possible explanation for the differences in stereoregularity observed between the fluorenyl complexes (e.g. 5) and the hydrogenated fluorenyl complexes (9 and 10). It was suggested that instead of ring-flip causing a decrease in polymer stereoregularity, increased steric crowding due to the hydrogenated rings leads to poorer coordination of propylene and that a chain end epimerization mechanism is occurring instead of the proposed enantiomorphic site control with varying degrees of chain stationary insertions.