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Ultimately Specific 1,4-cis Polymerization of 1,3-Butadiene with a Novel Gadolinium Catalyst

✍ Scribed by Shojiro Kaita; Zhaomin Hou; Masayoshi Nishiura; Yoshiharu Doi; Junko Kurazumi; Akira C. Horiuchi; Yasuo Wakatsuki

Publisher: John Wiley and Sons
Year: 2003
Tongue: English
Weight: 255 KB
Volume: 24
Category: Article
ISSN: 1022-1336
DOI: 10.1002/marc.200390031

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✦ Synopsis

Abstract

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).

magnified imageORTEP drawing of 2b. Selected bond distances (Å): Pr‐F1 = 2.549(2), Pr‐F19 = 2.625(2).

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