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Abstract

A new process is disclosed, particularly simple, convenient and practical, for the direct synthesis of metallocenes of formula (I): (CP)(ZR.sup.1.sub.m).sub.n (A).sub.r ML.sub.p L'.sub.q wherein (ZR.sup.1.sub.m).sub.n is a divalent group bridging Cp and A; Cp is a substituted or unsubstituted cyclopentadieryl group; A is --O--, --S--, --N(R.sup.2)--, wherein R.sup.2 is hydrogen, alkyl, cycloalkyl aryl, alkylaryl or arylalkyl, or A has the same meaning of Cp; M is a transition metal belonging to group 3, 4, 5, 6 or to the lanthanide or actinide groups; L is a monoanionic sigma ligand, such as alkyl, cycloalkyl, aryl, alkylaryl or arylalkyl, optionally containing Si or Ge; L' is halogen or --OR.sup.5, R.sup.5 being a hydrocarbon radical; m is 1 or 2; n is 0-4; r is 0 or 1; p is 1-3; q is 0-2. Said process comprises reacting the ligand (Y--Cp)(ZR.sup.1.sub.m).sub.n (A--Y).sub.r, wherein Y is a suitable leaving group, with at least 1 molar equivalent of ML'.sub.s in the presence of at least (1+r+p) molar equivalents of L.sub.j B or LMgL', wherein B is an alkaline or alkaline-earth metal, s ranges from 3 to 6, and j is 1 or 2.

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First Claim