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Doubly Bridged rac ‐Metallocenes of Zirconium and Hafnium
Author(s) -
Herrmann Wolfgang A.,
Morawietz Marcus J. A.,
Priermeier Thomas
Publication year - 1994
Publication title -
angewandte chemie international edition in english
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 0570-0833
DOI - 10.1002/anie.199419461
Subject(s) - homoleptic , hafnium , zirconium , olefin polymerization , metallocene , metal , olefin fiber , catalysis , polymerization , tacticity , chemistry , materials science , inorganic chemistry , polymer chemistry , organic chemistry , polymer
A quantitative and stereoselective synthesis of rac ‐metallocenes has been developed for the first time. The novel rac ‐metallocenes 1 were obtained from readily accessible homoleptic metal amides and nondeprotonated cyclopentadienes. Complexes of this type can be considered as catalysts of isotactic olefin polymerization. M = Zr, Hf; Y = NPh, C 5 H 4 .