Coordination polymerization with the novel η-C20H17Ti(OPr)3 complex

Modified corannulene based transition metal complexes of titanium as a novel group of metallocene catalysts were synthesized and investigated in coordination polymerization reactions as catalysts in the syndiospecific bulk polymerization of styrene. In comparison to the zirconium complex exo-(η⁵-C₂₀H₁₇)(η⁵-C₅H₅)ZrCl₂, the titanium complex η⁵-C₂₀H₁₇Ti(OⁱPr)₃ shows a significantly increased polymerization activity, a considerably improved stereoregularity of the syndiotactic polymer chain, indicated by the increased melting temperature of 269 °C, as well as a higher weight average molecular weight and a narrower molecular weight distribution.