Abstract 1‐Butene polymerization in the presence of MgCl 2 ‐supported Ziegler‐Natta catalyst systems was investigated under conditions such as to obtain polymer samples containing high amounts of (prevailingly) syndiotactic sequences. These were found in part to be linked to (prevailingly) isotactic sequences in stereoblock macromolecules. More clearly than in the case of the corresponding propene polymers, the spectroscopic characterization of the poly(1‐butene) samples proved that the syndiospecificity in such systems is dictated by the asymmetry of the last inserted monomer unit.
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Busico et al. (1992) studied this question.
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