NICKEL TRIS-PYRAZOLYL BORATE COMPLEXES AND THEIR USE

摘要

Nickel tris-pyrazolyl borate complexes having general formula (I), wherein: R', R'' and R''', the same or different, represent hydrogen, a linear or branched alkyl group having from 1 to 20 carbon atoms, or an aryl group with from 6 to 20 carbon atoms, optionally substituted with alkyl groups, both linear and branched, aryl groups, halogen, carbonyl, amine or carboxyl groups; X is selected from halogens (fluorine, chlorine or bromine), carboxylates and 1,3-dicarbonyl derivatives. The preparation of the above complexes is also described together with their use in the homo-, co- and terpolymerization of a-olefins.