کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
68846 | 48524 | 2007 | 10 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Synthesis and catalytic applications of C1 symmetric group 4 ansa-metallocene complexes Synthesis and catalytic applications of C1 symmetric group 4 ansa-metallocene complexes](/preview/png/68846.png)
The group 4 ansa-metallocene complexes with chiral substituent bearing cyclopentadienyl ligands, [M{Me2Si(η5-C5Me4)(η5-C5H3{CHRR′})}Cl2] (R = Pri, R′ = Me (9); R = Pri, R′ = Ph (10); R = But, R′ = Me (11); R = But, R′ = Ph (12); M = Zr (a), Hf (b)), were synthesized by the reaction of the dilithium compounds, Li2{Me2Si(C5Me4)(C5H3{CHRR′})} (R = Pri, R′ = Me (5); R = Pri, R′ = Ph (6); R = But, R′ = Me (7); R = But, R′ = Ph (8)), with the tetrachloride salts of the transition metal. The molecular structures of 11a and 12a have been determined by single-crystal X-ray diffraction studies. The catalytic behaviour of 9–12 in the polymerization of ethylene and propylene has been studied. Isotactic polypropylene with [mmmm] pentads of the order of 60% were obtained with the C1 symmetric ansa-zirconocene catalysts.
The preparation and characterization of new group 4 ansa-metallocene complexes containing chiral substituents and their role as catalysts in ethylene and propylene polymerization are described. Figure optionsDownload as PowerPoint slide
Journal: Journal of Molecular Catalysis A: Chemical - Volume 264, Issues 1–2, 1 March 2007, Pages 260–269