| abstract |
Organometallic complexes of lanthanides with a well-defined stoichiometry which can be used in the stereospecific polymerization of unsaturated monomers, can be represented by the general formula: n n n n Me(OR)₃*(Me₁R¹R²R³) x n n n nwherein, Me represents a metal with atomic number 21, 39, or an atomic number between 57 and 71, OR is an alkoxylic group of an alcohol; Me represents a metal of the group IIIB, whereas R¹, R², R³ can be H, or a linear, branched or cyclo-aliphatic alkyl radical containing from 1 to 10 carbon atoms and x is an integer (3 or 4) and depends on the type of alkoxide used. n The preparation of the complexes is described and their use in the stereospecific polymerization of unsaturated monomers. |