Regiospecificity of titanium‐based catalyst system for propene polymerization

Abstract

Abstract The sequence distribution of inverted monomeric units in the stereoirregular polypropylenes, prepared with the TiCl 4 /Al(C 2 H 5 ) 3 catalyst system, has been examined by 13 C NMR. Observed dyad and triad sequence distributions were in good agreement with those calculated from first‐order Markov statistics. The regioselectivity of an inserting propene seems to depend not only on the polarity of the active carbon‐titanium bond but also on the steric effects of the last propylene unit of a growing chain.