Copolymerization of butadiene with propene catalysed by systems containing tribenzyltitanium

Copolymerization of butadiene with propene was studied, catalysed by systems containing (C 6H 5CH 2) 3Ti and either alkyl aluminium halogenides or Ti (IV) compounds, and EPR spectra of the catalytically active systems were measured. Depending on the components of the catalytic system and on the conditions employed for the preparation of the catalytic complex, the resulting copolymers are either alternating with equimolar amounts of propene and butadiene, or containing one monomer in excess. The character of EPR spectra correlates with the results of copolymerization.