A metallocene catalyst in which the metal is coordinated by a &eegr;
5
cyclopentadienyl ligand which forms part of an indenyl or indenyloid moiety, characterised in that said moiety is directly or indirectly substituted at the 4-, 5-, 6- or 7-position by a pendant siloxy or germyloxy group.
一种
金属环化合物催化剂,其中
金属由&eegr;5
环戊二烯基
配体配位,该
配体是独立苯并环或苯并环类基团的一部分,其特征在于该基团在4-、5-、6-或7- 位置直接或间接地被挂接的
硅氧烷或
锗氧烷基团取代。