Patent ID: 6500949
Filing Date: 2002-12-31
Classification: C07F,C08F,Y10S

Abstract:
A process for forming a bridged Group 4 transition metal complex corresponding to the formula: wherein:M is a Group 4 metal in the +2, +3 or +4 formal oxidation state; Y1 and Y2 are independently anionic, cyclic or non-cyclic, &pgr;-bonded groups, Q, independently each occurrence, is a neutral, anionic or dianionic ligand group, said Q having up to 50 atoms not counting hydrogen; j is an integer from 1 to 4, selected with respect to the oxidation state of M and the electronic nature of Q to provide overall charge balance to the compound; R1 is independently each occurrence hydrogen, a hydrocarbyl group, a tri(hydrocarbyl)silyl group, or a tri(hydrocarbyl)silylhydrocarbyl group, or one of the foregoing multiatomic groups further substituted with one or more di(hydrocarbyl)amino- or hydrocarbyloxy- groups, said R1 group containing up to 50 atoms not counting hydrogen, and optionally both R1 groups may be joined together, optionally by means of one or more divalent bridging group moieties derived from the foregoing di(hydrocarbyl)amino- or hydrocarbyloxy-substituent groups, thereby forming a dianionic ligand group, the steps of the process comprising: (1) contacting a boron trihalide with a magnesium dianionic salt corresponding to the formula Mg(Y1H)(Y2H), wherein Y1 and Y2 are as previously defined to prepare a metal complex according to the formula: â€ƒwherein X is halide; (2) aminating the boron bridging atom thereby forming a compound of Formula 3, â€ƒwherein R1 is as previously defined, (3) deprotonating the product of step (2) of Formula 3 by contact with a deprotonating agent; and (4) contacting the product of step (3) with a transition metal salt of the formula MY3y(LB)b, wherein M is as previously defined; Y3 is Q or a leaving group; y is an integer from 0 to 4 selected to provide charge balance in the transition metal salt; LB is a Lewis base compound; and b is an integer from 0 to 3.