Synthesis of <i>ansa</i>-Zirconocene/Rhodium Heterobimetallic Complexes: Enhanced Catalytic Activity in Stereospecific Polymerization of α-Olefins
作者:Yoshitaka Yamaguchi、Noriyuki Suzuki、Takaya Mise、Yasuo Wakatsuki
DOI:10.1021/om980989m
日期:1999.3.1
Novel heterobimetallic complexes that consist of zirconium and rhodium, LRh(eta(2)-CH2=CH)(2)Si(eta(5)-C5H2-2,4-Me-2)(2)ZrCl2 (3a L = eta(5)-C9H7, 3b eta(5)-C5H5, 3c eta(5)-C5Me5), were synthesized, and 3b was structurally characterized. The complexes have a "C-2-symmetric" ansa-zirconocene part and the rhodium metal on the bridge part. The complexes 3a-c in combination with methylaluminoxane catalyzed highly isospecific polymerization of a-olefins. Their catalytic activities were higher than that of the parent zirconocene complex, and the obtained polymer had a larger molecular weight.