کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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1323394 | 977285 | 2007 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis and characterization of titanium and zirconium complexes with silicone-bridged phenoxycyclopentadienyl ligands Synthesis and characterization of titanium and zirconium complexes with silicone-bridged phenoxycyclopentadienyl ligands](/preview/png/1323394.png)
Dimethylsilyl(2,3,4,5-tetramethylcyclopentadienyl)(3-tert-butyl-5-methyl-2-phenoxy)titanium dichloride (1a), a useful catalyst precursor for olefin copolymerization, was synthesized at high yield starting from allyl-protected phenolic ligand 3a,which was first treated with 2 equiv. of n-BuLi to selectively give the dilithium salt of 3a along with 1-heptene, a coupling product of a protected allyl ether moiety and butyl anion. Addition of TiCl4 to the resulting dilithium salt of 3a in toluene afforded 1a in 50% isolated yield. This methodology could be applied to the preparation of related titanium and zirconoium complexes 1b–1d, 8 with silicone-bridged Cp-phenoxy ligands, whereas the reaction starting from methyl-protected precursor 2a did not produce the zirconium complex 8. Copolymerization of ethylene and 1-hexene with the newly prepared complexes was also investigated.
SiMe2-bridged Cp-phenoxy titanium and zirconium complexes 1a–1d, 8 were synthesized in high yields starting from allyl-protected phenolic ligands 3a–3d, which were first treated with 2 equiv. of n-BuLi to selectively give the dilithium salt of the ligands along with 1-heptene, a coupling product of a protected allyl ether moiety and butyl anion. Addition of TiCl4 to the resulting dilithium salts of the ligands in toluene afforded the complexes in good yields.Figure optionsDownload as PowerPoint slide
Journal: Journal of Organometallic Chemistry - Volume 692, Issue 19, 1 September 2007, Pages 4059–4066