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Stereo‐ and Regioselectivity of Chiral, Alkyl‐substituted ansa ‐Zirconocene Catalysts in Methylalumoxane‐activated Propene Polymerization
Author(s) -
Röll Werner,
Brintzinger HansHerbert,
Rieger Bernhard,
Zolk Ralf
Publication year - 1990
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.199002791
Subject(s) - propene , regioselectivity , alkyl , tacticity , catalysis , stereoselectivity , chemistry , polymerization , metallocene , polymer chemistry , medicinal chemistry , organic chemistry , polymer
Up to 94% yields of isotactic pentads are achieved in the polymerization of propene with the ansa ‐zirconocene catalysts 1 . It emerges that bulky substituents are decisive for the stereoselectivity, while α‐substituents are decisive for the regioselectivity. Moreover, α‐substituents favor the synthesis of long chains ( M w up to 9190). R 1 t Bu, i Pr; R 2 H. Me; μ‐X Me 2 CCMe 2 , Me 2 Si.