کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1335656 | 979541 | 2006 | 6 صفحه PDF | دانلود رایگان |
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)TiCl2, 2], was described. Complex 2 was synthesized by reaction of TiCl4 with the lithium salt of 1, followed by CH3Cl elimination at 65 °C. Molecular structures of 2 and a known complex, 2-tetramethylcyclopentadienyl-6-methyl-phenoxytitanium dichloride [(TCMP)TiCl2, 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 AliBu3 and Ph3C+B(C6F5)4-, complex 2 exhibits reasonable catalytic activity for ethylene polymerization, producing polyethylenes with moderate molecular weights and melting points.
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)TiCl2, 2], was described. Complex 2 was synthesized by reaction of TiCl4 with the lithium salt of 1, followed by CH3Cl elimination at 65 °C. Molecular structures of 2 and a known complex, 2-tetramethylcyclopentadienyl-6-methyl-phenoxytitanium dichloride [(TCMP)TiCl2, IVd], were determined by single-crystal X-ray diffraction. When activated with AliBu3 and Ph3C+B(C6F5)4-, complex 2 exhibits moderate catalytic properties for ethylene polymerization.Figure optionsDownload as PowerPoint slide
Journal: Polyhedron - Volume 25, Issue 15, 3 November 2006, Pages 3071–3076