Addition Polymerization of Cyclopentene with Nickel and Palladium Catalysts

Ethylene polymerization reactions with Ziegler-Natta catalysts. I. Ethylene polymerization kinetics and kinetic mechanism

“…Interaction of a Ni ␣-diimine complex containing a Ni-CH 3 group with cyclopentene at low temperatures results in insertion of the cycloolefin into the Ni-C bond with the formation of a ␤-agostically stabilized complex detected by 1 H-NMR. 30 3. Study of low-temperature ethylene oligomerization reactions with a series of Cp* 2 Sc-R complexes (R ϭ Me, Et, n-Pr) showed that the Cp* 2 Sc-CH 2 -CH 2 -CH 3 species at Ϫ80°C are 14 times more reactive in ethylene insertion compared to the Cp* 2 Sc-CH 2 -CH 3 species due to ␤-agostic stabilization of the latter.…”

Synthesis and Evaluation of Arylimino Pyridine Nickel(II) Catalysts: Influence of Substituents on Polyethylene Structure

“…In contrast to early metal systems, late metal catalysts most often dimerize or oligomerize olefins due to β-hydride elimination [13], which leads to a chain walking mechanism, producing alkyl branches of varying lengths randomly spaced along the polyethylene backbone [14]. This mechanism gives reasons for the formation of linear and branched polymers and short chain oligomers in the ethylene polymerization with nickel catalysts [10].…”

Stereo-controlled synthesis of polyolefins with cycloalkane groups by using late transition metals

“…Cyclic groups on the monomer can be introduced into the polymer as cis-fused cycloalkane groups. [7][8][9][10][11] The polymerization of non-conjugated dienes can also be used to synthesize polymers with cycloalkane groups because chain growth is accompanied by monomer ring closure. 12 Early transition metal complexes have been extensively used in cyclopolymerization reactions.…”