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Isoprene Polymerization with Yttrium Amidinate Catalysts: Switching the Regio‐ and Stereoselectivity by Addition of AlMe 3
Author(s) -
Zhang Lixin,
Nishiura Masayoshi,
Yuki Masahiro,
Luo Yi,
Hou Zhaomin
Publication year - 2008
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.200705120
Subject(s) - isoprene , stereoselectivity , yttrium , polymerization , catalysis , chemistry , selectivity , aluminium , organic chemistry , copolymer , polymer , oxide
Aluminum switches : The addition of AlMe 3 to the isoprene polymerization catalyst 1 /[Ph 3 C][B(C 6 F 5 ) 4 ] switches the regio‐ and stereoselectivity from 3,4‐isospecific to 1,4‐ cis selective (see scheme). A heterotrinuclear Y/Al complex obtained from the reaction of 1 with AlMe 3 shows 1,4‐ cis selectivity under similar conditions in the presence of [Ph 3 C][B(C 6 F 5 ) 4 ]. PI=polyisoprene.