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CONFERENCE John OSBORN Pr John E. BERCAW, California Institute of Technology, USA

April 26, 2019
From 10:30 until 12:30
Institut Le Bel, Amphi 2

Titre:

Synthetic and Mechanistic Studies of Alkene Trimerization and Polymerization with Organotransition Metal Catalysts

 

Abstract:
The evolution of our research group's research efforts to understand the fundamental steps of catalytic olefin polymerization: initiation, propagation, and chain transfer, beginning with the initial demonstration that Cp*2ScR (Cp* = C5Me5; R = H, alkyl) polymerizes ethylene, will be reviewed. The development of new stereoselective catalysts for propylene polymerization, based on organoscandium, organoyttrium, and organozirconium complexes, revealed the basis for stereocontrol leading to isotactic, syndiotactic, or hemitactic microstructures. Recently the group has explored the mechanisms of ethylene and 1-alkene trimerization with organochromium and organotitanium precatalysts. We have demonstrated successful combination of trimerization with polymerization catalysis for tandem ethylene trimerization, followed by copolymerization of the so-produced 1-hexene with additional ethylene, to yield butyl-branched linear low density polyethylene from an ethylene-only feed.