Two tetramethyldisiloxanediyl bridged binuclear titanocenes Cl2CpTiCp*(CH3)2SiOSi(CH3)2Cp*TiCpCl2(Cp*=substituted cyclopendienyl

R=H in catalyst A

R=Si(CH3)3 in catalyst B) have been synthesized by the reacting dilithium salts of Cp*(CH3)2SiOSi(CH3)2Cp* with CpTiCl3 in the yields of 42% and 51% respectively. Their catalysis behavior for the polymerization of ethylene under different conditions were investigated

and compared with mononuclear metallocene

cyclopentadienyl- titanium dichloride.The result showed that these two catalysts have a middle activity for ethylene polymerization.The MWD of the polyethylene were rather wide and the highest molecular weight was as high as 5.9×104g/mol.Furthermore

catalyst B exhibited unexpected temperature dependence for ethylene polymerization.