Complex catalysis

Polymerization of norbornene in the presence of ethene over tetrakis(triphenylphosphine)nickel/boron trifluoride etherate system

“…To the best of our knowledge, there is no data in the literature regarding ethene transformation by means of the cationic complex [1-CH 3 C 3 H 5 Ni(COD)]PF 6 [7], nor about any catalyst systems based on Co(II) compounds and MAO [5]. However, the cationic allylnickel(II) complexes, [2-RC 3 H 4 Ni(COD)]PF 6 , are valuable catalysts for the oligomerization of ethene [16,17]. When ethene is copolymerized with norbornene, all these catalysts lead to macromonomers with a vinylic end group due to b-hydride elimination after insertion of an ethene monomer unit.…”

Ionic liquids—weakly-coordinating solvents for the biphasic ethylene oligomerization to α-olefins using cationic Ni-complexes

“…Depending on their chain length, they are components of plastics (C 4 -C 6 HAOs in copolymerisation), plasticizers (C 6 -C 10 HAOs through hydroformylation), lubricants (C 10 -C 12 HAOs through oligomerization) and surfactants (C 12 -C 16 HAOs through arylation/sulphonation). HAOs can be obtained from ethylene via oligomerization processes, such as those practiced by BP Amoco (alkylaluminium catalyst) and Shell (SHOP, neutral nickel/phosphine catalyst).…”

“…Due to their positive charge, they usually possess higher electrophilicity of the nickel center which often results in a higher oligomerization activity of the system [3][4][5][6][7][8].…”

“…The results of the ethylene oligomerization with catalyst [(mall)Ni(dppmo)][SbF 6 ] in different organic solvents are presented in Table 1 [9].…”

“…While [(mall)Ni(dppmo)][SbF 6 ] shows good solubility in CH 2 Cl 2 and CHCl 3 , the complex does not dissolve in chlorobenzene. In CHCl 3 fast decomposition is observed.…”