| abstract |
A process for preparing dihalide or monohalide metallocene compounds comprising contacting a compound of formula (II) (Cp)(ZR 1 m ) n (A) r ML′ y (II) wherein Cp is a cyclopentadienyl radical; (ZR 1 m ) n is a divalent bridging group between Cp and A; A is a cyclopentadienyl radical or O, S, NR 2 , PR 2 wherein R 2 is an hydrocarbon radical, M is zirconium, titanium or hafnium, L′ is an hydrocarbon radical, r ranges from 0 to 2 and y is equal to 4; with an halogenating agent selected from the group consisting of: T 1 L w 1 wherein T 1 is a metal of groups 3–13 of the periodic table; L is halogen and w 1 is equal to the oxidation state of the metal T 1 ; T 2 L w 2 wherein T 2 is a nonmetal element of groups 13–16 of the periodic table (new IUPAC version); and w 2 is equal to the oxidation state of the element T 2 ; O=T 3 L w 3 where T 3 is a selected from the group consisting of C, P and S; O is an oxygen atom bonded to T 3 trough a double bond; and w 3 is equal to the oxidation state of the element T 3 minus 2; R 6 C(O)L, wherein R 6 is an hydrocarbon radical; L 2 and HL. |