Isospecific Propylene Polymerization Using the [ArN(CH2)3NAr]TiCl2/Al(iBu)3/Ph3CB(C6F5)4 Catalyst System in the Presence of Cyclohexene

Propylene polymerization was carried out using the [ArN(CH₂)₃NAr]TiCl₂ (Ar = 2,6‐iPr₂C₆H₃)/Al(iBu)₃/Ph₃CB(C₆F₅)₄ catalyst system in the presence of cyclohexene. It was found that isospecific polymerization is promoted by adding cyclohexene even at low propylene concentration. It was also indicated that a considerable number of isospecific active species retain the metal‐polymer bond. Based on this fact, isotactic poly(propylene)‐block‐poly(1‐hexene) could be obtained.