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Ultimately Specific 1,4‐cis Polymerization of 1,3‐Butadiene with a Novel Gadolinium Catalyst
Author(s) -
Kaita Shojiro,
Hou Zhaomin,
Nishiura Masayoshi,
Doi Yoshiharu,
Kurazumi Junko,
Horiuchi Akira C.,
Wakatsuki Yasuo
Publication year - 2003
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/marc.200390031
Subject(s) - polymerization , polybutadiene , catalysis , yield (engineering) , 1,3 butadiene , gadolinium , polymer chemistry , crystallography , materials science , chemistry , polymer , copolymer , organic chemistry , composite material
Novel complexes [(C 5 Me 5 ) 2 Ln][B(C 6 F 5 ) 4 ] (Ln = Pr, Nd, or Gd) were prepared, which in combination with i Bu 3 Al efficiently induce highly 1,4‐cis‐specific polymerization of butadiene. The activity of the Gd complex/ i Bu 3 Al system is high enough to exhibit good catalytic activity even at low temperature. Polymerization at −78 °C gave polybutadiene with nearly perfect 1,4‐cis microstructure (>99.9%) with sharp molecular weight distribution ( M w / M n = 1.45) and in reasonable yield.ORTEP drawing of 2b . Selected bond distances (Å): Pr‐F1 = 2.549(2), Pr‐F19 = 2.625(2).
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