Synthesis and Characterization of Group 4 Fluorinated Bis(amidinates) and Their Reactivity in the Formation of Elastomeric Polypropylene

Bis­(amidinate) titanium and zirconium bis­(dimethylamido)
complexes
were prepared, and the dynamic behavior of the titanium complex containing
perfluorinated amidinate ligand (11) was studied in detail.
The variable-temperature NMR revealed the presence of two species
in solution, in line with the different connection modes of the ligand
to the metal center. The resulting complexes were tested as catalysts
in the polymerization of propylene, and the resulting polymers were
consistent with elastomeric high-molecular-weight atactic polypropylenes.