Abstract
The stereospecific polymerization of diolefins using new catalytic systems based on less conventional transition metal complexes is reviewed. In particular, two families of catalysts based on new complexes of π-allyl type of actinide and lanthanide elements, as well as three component systems formed by rare-earth metal alkoxides, aluminum alkyls, and a Lewis acid are described. A peculiarity of both actinide and lanthanide catalysts is their ability to give, at very low concentration, extremely high cis diolefin polymers and copolymers in aliphatic solvents.
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