Synthesis and characterization of new bis(2-R-indenyl) zirconium dichloride complexes for the olefin polymerization
作者:Gong Yeal Lee、Ming Xue、Myoung Soon Kang、Oh Chul Kwon、Jin-San Yoon、Yoo-Su Lee、Hoon Sik Kim、Hyunjoo Lee、Ik-Mo Lee
DOI:10.1016/s0022-328x(98)00386-6
日期:1998.5
corresponding alkyl anions to 2-indanone in the presence (or absence) of LaCl3. With these 2-alkylindenes, bis(2-alkylindenyl)zirconium dichloride complexes were synthesized to investigate the effects of alkyl substituents at 2-position of indene on the rotational conversion rate between rotamers (racemic and meso) and the catalytic activities toward olefin polymerization. Analysis of NMR spectra could line
在存在(或存在)的条件下,通过将相应的烷基阴离子亲核加成到2-茚满酮中,制备了一系列2-烷基茚基(2-RInd; R = Me,i-Pr,n-Bu,Bzl,Cy,t-Bu)缺)的LaCl 3。用这些2-烷基茚,合成了双(2-烷基茚基)二氯化锆配合物,以研究茚2-位上的烷基取代基对旋转异构体(外消旋和内消旋)之间的旋转转化率以及对烯烃聚合的催化活性的影响。NMR光谱分析可以按顺序排列烷基取代基的给电子能力和空间体积,并且可变温度NMR分析(从298至193 K)证明这些烷基不能冻结茚基配体的自由旋转。这些配合物表现出对乙烯和丙烯聚合的催化活性以及催化活性的变化(PE,Me> Cy> i-Pr> Bzl> n-Bu; PP,Me> n-Bu> i-Pr> Cy> Bzl),分子量(PE,n-Bu> Cy> i-Pr> Me> Bzl; PP,n-Bu> Me> Cy> i-Pr> Bzl),和多分散性(PE,2