Pd-Catalyzed Polymerization of Dienes that Involves Chain-Walking Isomerization of the Growing Polymer End:Synthesis of Polymers Composed of Polymethylene and Five-Membered-Ring Units

摘要

Co-polymerization reactions of ethylene with cyclic olefins,such as norbornene and cyclopentene as well as with 1,5-or 1,6-dienes that undergo cyclization during the polymer growth,produce hydrocarbon polymers with five-or six-membered cyclic units that are located randomly.These reactions that use a co-monomer with a functional group and are catalyzed by late-transition-metal complexes provide a steady route to functionalized polyethylenes.