New Group IV Metallocene Systems Active in the Copolymerization of α-Olefins and Conjugated Dienes

✍ Scribed by Mariagrazia Napoli; Stefania Pragliola; Chiara Costabile; Pasquale Longo

• Book ID: 102488091
• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 133 KB
• Volume: 207
• Category: Article
• ISSN: 1022-1352
• DOI: 10.1002/macp.200500457

✦ Synopsis

Abstract

Summary: Rac‐[CH~2~(2,4‐di‐tert‐butyl‐cyclopentadienyl)~2~]ZrCl~2~ (1), rac‐[CH~2~(3‐tert‐butyl‐4,5,6,7‐tetrahydroindenyl)~2~]ZrCl~2~ (2), rac‐[CH~2~(3‐isopropyl‐4,5,6,7‐tetrahydroindenyl)~2~]ZrCl~2~ (3), and rac‐[CH~2~(3‐methyl‐4,5,6,7‐tetrahydroindenyl)~2~]ZrCl~2~ (4) were synthesized and characterized by ^1^H NMR analysis. These C~2~ symmetric ansa‐zirconocenes, activated with methylaluminoxane (MAO), were able to promote copolymerization of ethene and 1,3‐butadiene. The structures of the copolymers are strongly influenced by zirconocene utilized as catalytic precursor. Depending on the reaction conditions polyethenes containing cyclopropane and cyclopentane rings, or 1,1‐ 1,3‐butadiene inserted constitutional units, were obtained.

Structures of the synthesized catalytic precursors.

magnified imageStructures of the synthesized catalytic precursors.