Abstract
The synthesis of a new bidentate ligand, 1-(2-methoxyphenyl)-2,3,4,5-tetramethyl-cyclopentadiene ( 1), as well as its corresponding constrained geometry titanium complex, 2-tetramethylcyclopentadienyl-phenoxytitanium dichloride [(TCP)TiCl 2, 2], was described. Complex 2 was synthesized by reaction of TiCl 4 with the lithium salt of 1, followed by CH 3Cl elimination at 65 °C. Molecular structures of 2 and a known complex, 2-tetramethylcyclopentadienyl-6-methyl-phenoxytitanium dichloride [(TCMP)TiCl 2, IVd], were determined by single-crystal X-ray diffraction. The Cp(cent)–Ti–O angles of 107.4° for 2, 107.0° for IVd reveal their sterically open features as catalyst precursors. When activated with Al i Bu 3 and Ph 3 C + B ( C 6 F 5 ) 4 - , complex 2 exhibits reasonable catalytic activity for ethylene polymerization, producing polyethylenes with moderate molecular weights and melting points.
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