Andreas Winter, Martin Antberg, Walter Spaleck, Jurgen Rohrmann, Volker Dolle: 2-substituted disindenylmetallocenes, process for their preparation, and their use as catalysts in the polymerization of olefins. Hoechst Aktiengesellschaft, September 8, 1992: US05145819 (246 worldwide citation)

The novel metallocenes of the formula I ##STR1## in which, preferably, M.sup.1 is Zr or Hf, R.sup.1 and R.sup.2 are alkyl or halogen, R.sup.3 and R.sup.4 are hydrogen, R.sup.5 and R.sup.6 are alkyl or haloalkyl, --(CR.sup.8 R.sup.9).sub.m --R.sup.7 --(CR.sup.8 R.sup.9).sub.n -- is a single- or multi ...