Abstract
A series of C1 symmetric, 1,2‘-bridged bis(indenyl)zirconium dichlorides were prepared to study the effect of ligand substitution, symmetry, and bridge identity on the stereoselectivity of propylene polymerization. Unsubstituted [1-(1-indenyl)-2-(2-indenyl)ethane]zirconium dichloride, Et(2-Ind)(1-Ind)ZrCl2 (1), was synthesized, and its propylene polymerization behavior was compared to three 2-phenyl-substituted complexes with different bridges: [2-(2-indenyl)-1-(2-phenyl-1-indenyl)ethane]zirconium dichloride, Et(2-Ind)(2-Ph-1-Ind)ZrCl2 (2), [(2-indenyl)-(2-phenyl-1-indenyl)dimethylsilyl] zirconium dichloride, Me2Si(2-Ind)(2-Ph-1-Ind)ZrCl2 (3), and [(2-indenyl)-(2-phenyl-1-indenyl)methane]zirconium dichloride, CH2(2-Ind)(2-Ph-1-Ind)ZrCl2 (4). The polymerization activity, polypropylene molecular weight, and microstructure were dependent upon the identity of the bridge and the substitution patterns on the metallocenes. Metallocenes 1, 2, 3, and 4 are characterized by a gauche orientation of the indenyl liga...
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
