Patent ID: 6191294
Filing Date: 2001-02-20
Classification: C07F,C08F,Y10S

Abstract:
A process for the preparation of cyclopentadienyl metallocene compounds of formula (I):(Cp)(ZR.sup.1.sub.m).sub.n (A).sub.r ML.sub.p L'.sub.q (I)wherein (ZR.sup.1.sub.m).sub.n is a divalent group bridging Cp and A, Z being C, Si, Ge, N or P, and the R.sup.1 groups, same or different from each other, being hydrogen or linear or branched, saturated or unsaturated C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.20 cycloalkyl, C.sub.6 -C.sub.20 aryl, C.sub.7 -C.sub.20 alkylaryl or C.sub.7 -C.sub.20 arylalkyl groups;Cp is a substituted or unsubstituted cyclopentadienyl group, optionally condensed to one or more substituted or unsubstituted, saturated, unsaturated or aromatic rings, containing from 4 to 6 carbon atoms, optionally containing one or more heteroatoms;A is --O--, --S--, --N(R.sup.2)--, wherein R.sup.2 is hydrogen, a linear or branched, saturated or unsaturated C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.20 cycloalkyl, C.sub.6 -C.sub.20 aryl, C.sub.7 -C.sub.20 alkylaryl or C.sub.7 -C.sub.20 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 of the Periodic Table of the Elements (IUversion);the substituents L, same or different from each other, are monoanionic sigma ligands selected from the group consisting of linear or branched, saturated or unsaturated C.sub.1 -C.sub.20 alkyl, C.sub.3 -C.sub.20 cycloalkyl, C.sub.6 -C.sub.20 aryl, C.sub.7 -C.sub.20 alkylaryl and C.sub.7 -C.sub.20 arylalkyl groups, optionally containing one or more Si or Ge atoms;the substituents L', same or different from each other, are halogens or --OR.sup.5, wherein R.sup.5 has the same meaning of R.sup.1 ;m is 1 or 2; n ranges from 0 to 4; r is 0 or 1; n is 0 when r is 0; p ranges from 1 to 3; q ranges from 0 to 2, p+q being equal to the oxidation state of the metal M minus 2 when r=1, and minus 1 when r=0, and p+q being.ltoreq.4;said process being characterized by comprising the following steps:(1) reacting a ligand of formula (Y--Cp)(ZR.sup.1.sub.m).sub.n (A--Y).sub.r with at least (1+r+p) molar equivalents of a compound of formula L.sub.j B or LMgL', wherein Cp, A, Z, R.sup.1, m, n, p, r, L and L' have the meaning reported above; the groups Y, the same or different from each other, are suitable leaving groups; B is an alkaline or alkaline-earth metal; and j is 1 or 2, j being equal to 1 when B is an alkaline metal, and j being equal to 2 when B is an alkaline-earth metal; and(2) reacting the product obtained from step (1) with at least 1 molar equivalent of a compound of formula ML'.sub.s, wherein M and L' have the meaning reported above; s is an integer corresponding to the oxidation state of the metal and ranges from 3 to 6.