Polymerization with TMA-protected polar vinyl comonomers. II. Catalyzed by nickel complexes containing ?-diimine-type ligands

Copolymerization of ethylene/unsaturated alcohols using nickel catalysts: effect of the ligand on the activity and comonomer incorporation

“…Homo-and copolymers were analyzed by NMR as described previously [4,8]. 1 H and 13 C NMR spectra were obtained on samples dissolved in a mixture of 1,2,4-trichlorobenzene with 35% C 6 D 6 at 110°C or CDCl 3 at room temperature.…”

“…However, some pioneering work on direct copolymerization of a-olefins with monomers containing functional groups using homogeneous metallocene-type catalysts has been reported recently [2][3][4]. In particular, the cationic Ni and Pd complexes with bulky diimine ligands show much improved tolerance against polar functionality [5][6][7][8] due to the typically lower Lewis acidity of late transition metals.…”

Titanium and zirconium ketimide complexes: synthesis and ethylene polymerisation catalysis

“…The polymerisation apparatus and polymer work up were described in previous papers [29][30][31] The polymerisation mixture was quenched with acidic methanol (2%HCl) and the precipitated polymer was filtered, washed with methanol and dried in a vacuum oven at 60°C during three days.…”

Titanium ketimide complexes as α-olefin homo- and copolymerisation catalysts. X-ray diffraction structures of [TiCp′(NCtBu2)Cl2] (Cp′=Ind, Cp*)

“…The comonomer studied in these reactions was a a; x-unsaturated alcohol, namely the 10-undecen-1-ol (U). Following a methodology developed previously [32,33] the polar comonomer was protected by an alkylaluminium in the reaction medium and MAO was used as cocatalyst. All the attempts made in order to obtain homopolyundecenol using the titanium systems 1-3/MAO failed.…”

“…The polymerisation apparatus and polymer work up were described in previous papers [32,33,44]. The polymerisation mixture was quenched with acidic methanol (1% HCl) and the precipitated polymer was filtered, washed with methanol and dried in a vacuum oven at 60°C during three days.…”