Effect of temperature on the isospecific propylene polymerization catalyzed by rac-dimethylsilylbis(2,4,6-trimethyl-1-indenyl)zirconium dichloride/methyl aluminoxane

The novel zirconocene rac-dimethylsilyl-bis (2,4,6-trimethyl-1-indenyl)zirconium dichloride (1) showed higher stability at elevated temperature than rac-dimethylsilyl-bis(indenyl)zirconium dichloride (2) when used as catalyst for isopecific polymerization of propylene. 1/MAO is also more stereospecific and regiospecific than 2/MAO.