443288-64-0Relevant academic research and scientific papers
Synthesis of nonbridged (anilide)(cyclopentadienyl)titanium(IV) complexes of the type Cp′TiCl2[N(2,6-Me2C6H3)(R)] and their use in catalysis for olefin polymerization
Nomura, Kotohiro,Fujii, Kensaku
, p. 3042 - 3049 (2008/10/08)
(Anilide)(cyclopentadienyl)titanium(IV) complexes of the type Cp′TiCl2[N(2,6-Me2C6H3)-(R)] (8a-d: Cp* = C5Me5 (Cp*), 1,3-Me2C5H3, Cp; R = SiMe3, SitBuMe2) have been prepared by the reaction of Cp′TiCl3 with the corresponding lithium anilide in toluene. The structure of (1,3-Me2C5H3)TiCl2[N(2,6-Me2 C6H3)(SiMe3)] (8b) has been determined by X-ray crystal-lography. These complexes exhibited high catalytic activities for ethylene polymerization in the presence of methylaluminoxane (MAO); especially Cp*TiCl2[N(2,6-Me2C6H3)(SiMe 3)] (8a) exhibited the highest catalytic activity (108s 0 kg of PE/((mol of Ti) h), ethylene 6 atm at 25 °C), whereas the analogous zirconium complex Cp*ZrCl2[N(2,6-Me2C6H3)(SiMe 3)] (9a) showed a lower activity (637 kg of PE/((mol of Ti) h)) under the same conditions. The activity by Cp′TiCl2[N(2,6-Me2C6H3)(SiMe 3)] for the ethylene polymerization increased in the order Cp* > 1,3-Me2C5H3, Cp. The molecular weight for the resultant polyethylene depended upon the cyclopentadienyl fragment used. The low catalytic activity was observed for propylene polymerizations by 8a; the resultant polymer was atactic and possessed high molecular weight with narrow polydispersity.
