Abstract
Catalytic 1,3-butadiene polymerization systems can be obtained with the new complex [NbO(C 16 H 11 O 6 . )(C 2 O 4 2. )] as a catalyst. When the catalysis occurs in a homogeneous medium (toluene as a solvent) in conjunction with AlEt 2 Cl, cis-1,4-polybutadiene is obtained. A remarkable inversion of stereoselectivity has been observed when the catalysis is carried out in a two phase system with the molten salt AlC1 3 .1-methyl-3-n-butyl-imidazolium chloride (MBIC) as a solvent and AlEt 2 Cl as a cocatalyst, giving the trans 1,4-polybutadiene.
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