Patent ID: 6774253
Filing Date: 2004-08-10
Classification: C07F,Y10S

Abstract:
A process for the preparation of titanium complexes of formula (I):(D)(ZR1m)n(A)TiLpXqâ€ƒâ€ƒ(I) wherein:(ZR1m)n is a divalent group bridging D and A; Z is selected from the group consisting of C, Si, Ge, N, P and B; the R1 groups, the same or different from each other, are selected from the group consisting of hydrogen, linear or branched, saturated or unsaturated C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl and C7-C20 arylalkyl groups, or two R1 groups form together a cycle; m is 1 or 2; n is an integer ranging from 1 to 3; D is a delocalized &pgr;-bonded moiety, which is bound in a &eegr;5 bonding mode to Ti; A is a divalent anionic group selected from â€”Oâ€”, â€”Sâ€”, â€”N(R2)â€” and â€”P(R2)â€”, wherein R2 is hydrogen, a linear or branched, saturated or unsaturated C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl or C7-C20 arylalkyl, optionally containing â€”ORâ€², â€”SRâ€², â€”NRâ€²2 or â€”PRâ€²2 groups, wherein Râ€² is a C1-C10 alkyl group; Ti is titanium; 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 C1-C20 alkyl, C3-C20 cycloalkyl, C6-C20 aryl, C7-C20 alkylaryl and C7-C20 arylalkyl groups, optionally containing one or more Si or Ge atoms; X is halogen or â€”ORâ€², wherein Râ€² is a C1-C10 alkyl group; p is 1 or 2; q is 0 or 1, and p+q=2; said process being characterized by comprising the following steps: (1) reacting a ligand of formula (Hâ€”D)(ZR1m)n(Aâ€”H) with about (2+p) molar equivalents of a compound of formula LjB or LMgX, wherein D, A, Z, R1, m, n, p, X and L have the meaning reported above; B is an alkaline or alkaline-earth metal; 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 about 1 molar equivalent of a compound of formula TiX4, wherein X has the meaning reported above.