Abstract
Monomer-isomerization polymerization of cis-2-butene (c2B) with Ziegler-Natta catalysts was investigated to clarify the isomerization mechanism. With the TiCl3-(C2H5)3Al catalyst, the isomerization of c2B to 1-butene (1B) and trans-2-butene (t2B) was determined as 42.7 and 52.8 kJ mol−1, respectively; i.e., the activation energy for geometric isomerization was higher than that for the positional one. From the effects of alkylaluminums on the monomer-isomerization polymerization of c2B and analysis of gaseous materials produced from the catalyst components, isomerization was concluded via a σ-alkylmetal complexes formed by the insertion of c2B into the Ti2+-H bond produced from the catalyst components.
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Endo, K., Ueda, R. & Otsu, T. Monomer-Isomerization Polymerization XXXIV. Active Sites for Isomerization in Monomer-Isomerization Polymerization of 2-Butene with Ziegler-Natta Catalyst. Polym J 23, 1173–1178 (1991). https://doi.org/10.1295/polymj.23.1173
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DOI: https://doi.org/10.1295/polymj.23.1173