Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
66089 | Journal of Molecular Catalysis A: Chemical | 2012 | 10 Pages |
Synthesis and structural analysis of various phenoxy modified half-titanocenes with different anionic ligands of the type, Cp*TiX(Y)(O-2,6-iPr2C6H3) [X = Y = pyr (2, pyr = C4H4N), pz (3, C3H3N2), OPh (4); X = Cl, Y = OCH(CF3)2 (5)] have been explored. Ethylene/styrene copolymerization by 2, 5, and Cp*TiCl2(O-2,6-iPr2C6H3) (1) in the presence of [PhN(H)Me2][B(C6F5)4] and Al(i-Bu)3/Al(n-octyl)3 afforded poly(ethylene-co-styrene)s as the sole product even at 55 and 70 °C, whereas the pyrazolato analogue (3) showed the negligible activity and 4 afforded a mixture of copolymer and syndiotactic polystyrene: 5 showed the better catalyst performance in terms of activity, suggesting that the anionic ligand (X,Y) plays a role in this catalysis.
Graphical abstractFigure optionsDownload full-size imageDownload high-quality image (187 K)Download as PowerPoint slideHighlights► Syntheses of new phenoxy modified half-titanocenes with various anionic ligands. ► Notable effects of anionic ligands and cocatalysts in Ti catalyzed ethylene/styrene copolymerization. ► Exclusive syntheses of ethylene/styrene copolymers with high styrene content at 70 °C. ► Best catalyst performance attained by Cp*TiCl[OCH(CF3)2](O-2,6-iPr2C6H3).