Dicarbollide Analogues of the Constrained-Geometry Polymerization Catalyst

• Published in: Organometallics Vol. 20; no. 21; pp. 4298 - 4300
• Main Authors: Kim, Dae-Hyun, Won, Je Hong, Kim, Sung-Joon, Ko, Jaejung, Kim, Sang Hern, Cho, Sungil, Kang, Sang Ook
• Format: Journal Article
• Language: English
• Published: American Chemical Society 15.10.2001
• ISSN: 0276-7333; 1520-6041
• DOI: 10.1021/om010297p

A new type of constrained-geometry complex, [η5:η1-RC2B9H9−CH2NMe2]TiCl2 (3), based on the dimethylamino dicarbollyl ligand has been prepared and characterized by 11B, 13C, and 1H NMR spectroscopy. This complex is the first example of a compound containing the “CGC-type” dicarbollyl ligand for titanium in its highest (4+) oxidation state. Complexes 3 in the presence of MMAO exhibit moderate catalytic activities for the ethylene polymerization but produce high-molecular-weight polymers.