Asymmetrically substituted metallocenes which are functionalized on one cyclopentadienyl ring, and their preparation

摘要

The invention relates to compounds of the general formula (1) P P(R.sup.1 R.sup.2 X.sup.1 Si((R.sup.3).sub.a Cp))((R. sup.4).sub.a Cp)M(X.sup.2).sub.n (1)PPin whichP PR.sup. 1 and R.sup.2 =independently of one another an alkyl or aryl radical, PPX.sup.1 =F, Cl, Br, I, p-tolylSO.sub.3 --, F.sub.3 CSO.sub. 3 --, F.sub.3 CCO.sub.2 -- or H.sub.3 CCO.sub.2 --, PPR. sup.3 and R.sup.4 =identical or different alkyl, alkyl ether, aryl or aryl ether groups where 0≦a≦4,PPCp=a cyclopentadienyl, indenyl, tetrahydroindenyl or fluorenyl radical, PPM=a transistion metal from groups 3-6 (IUPAC notation), in particular Ti, Zr or Hf,PPX.sup.2 =F, Cl, Br or I, PPthe oxidation number of the transition metal minus 2. PPAlso disclosed is a process of making compounds of formula (1) by reacting the metallocene counterpart thereof with acid HX.sup.1.