Synthesis of elastomeric polypropylene in bulk using C 1-symmetric ansa-metallocenes. New aspects of the synthesis of 1-(fluoren-9-yl)-2-(2-methyl-5,6-dihydrocyclopenta [f]-1H-inden-1-yl)ethane and complexes of zirconium and hafnium with this ligand
Formation and Structures of Hafnocene Complexes in MAO- and AlBu<sup>i</sup><sub>3</sub>/CPh<sub>3</sub>[B(C<sub>6</sub>F<sub>5</sub>)<sub>4</sub>]-Activated Systems
作者:Konstantin P. Bryliakov、Evgenii P. Talsi、Alexander Z. Voskoboynikov、Simon J. Lancaster、Manfred Bochmann
DOI:10.1021/om800664p
日期:2008.12.8
for the formation of the highly active sites in olefin polymerization. The ionic hydrido species differ significantly in stability. The formation of the mixed-alkyl complex L′Hf(Me)CH2SiMe3 proceeds with surprisingly high diastereoselectivity; the sterically more hindered isomer is produced preferentially. It reacts with CPh3[B(C6F5)4] to afford the ion pair [L′Hf-CH2SiMe3]+[B(C6F5)4]− as two diastereomers
基于(SBI)HfCl 2,Me 2 C(C 5 H 4)(Flu)HfCl 2,Ph 2 C(C 5 H 4)(Flu)HfCl 2和L'的与烯烃聚合有关的阳离子物种的形成由MAO,AlMe 3 / CPh 3 [B(C 6 F 5)4 ]和AlBu i 3 / CPh 3 [B(C 6 F 5)4 ]活化的HfCl 2(SBI = rac -Me 2 Si(Ind)2个; 通过1 H,13 C和19 F NMR光谱研究了L'= C 2 H 4(Flu)(5,6-C 3 H 6 -2-MeInd))。所述类型的热稳定的异双核中间体[LHF(μ-Me)的2阿尔梅2 ] + [MeMAO] -和[LHF(μ-Me)的2阿尔梅2 ] + [B(C 6 ˚F 5)4 ] -被确定时使用MAO和AlMe 3 / CPh 3 [B(C 6 F 5)4分别作为激活剂。这些种类的稳定性解释了与锆茂合金相比,在含有AlMe