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Synthesis of ansa-Zirconocene/Rhodium Heterobimetallic Complexes:  Enhanced Catalytic Activity in Stereospecific Polymerization of α-Olefins

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journal contribution
posted on 1999-02-20, 00:00 authored by Yoshitaka Yamaguchi, Noriyuki Suzuki, Takaya Mise, Yasuo Wakatsuki
Novel heterobimetallic complexes that consist of zirconium and rhodium, LRh(η2-CH2CH)2Si(η5-C5H2-2,4-Me2)2ZrCl2 (3a L = η5-C9H7, 3b η5-C5H5, 3c η5-C5Me5), were synthesized, and 3b was structurally characterized. The complexes have a “C2-symmetric” ansa-zirconocene part and the rhodium metal on the bridge part. The complexes 3ac in combination with methylaluminoxane catalyzed highly isospecific polymerization of α-olefins. Their catalytic activities were higher than that of the parent zirconocene complex, and the obtained polymer had a larger molecular weight.