720700-86-7Relevant articles and documents
Cationic nickel complexes containing bulky phosphine ligands: Catalyst precursors for styrene polymerization
Jimenez-Tenorio, Manuel,Puerta, M. Carmen,Salcedo, Isabel,Valerga, Pedro,Costa, Sandra I.,Silva, Leonel C.,Gomes, Pedro T.
, p. 3139 - 3146 (2008/10/09)
The cationic complexes [Ni(η3-CH2C(R)CH 2)(P)2] IBPh4] (R = Me, H; (P)2 = (PMei-Pr2)2, (PPhiPr 2)2, 1,2-bis(diisopropylphosphino)ethane (dippe)) and [Ni(η-2-MeInd)(P)2] [BPh4] (2-Melnd = 2-methylindenyl; (P)2 = (PMeiPr2)2, (PPh iPr2)2, dippe) have been prepared and characterized. These materials are catalyst precursors for the nonliving polymerization of styrene to polystyrene without the need of a cocatalyst such as methylaluminoxane. The polymerization reactions are carried out in refluxing 1,2-dichloroethane, using a 1:1000 catalyst to styrene ratio, yielding essentially atactic polystyrenes with Mn in the range 14 500-155 000 Da and polydispersities between 1.89 and 9.70. The mass properties of the polymers and the overall yield depend much on the nature of the catalyst precursor.