Disclosed is a catalyst having the general formula ##STR1## where L is a ligand having the formula ##STR2## L' is L, Cp, Cp*, indenyle fluorenyl, NR.sub.2, OR, or halogen, L can be bridged to L; X is halogen, NR.sub.2, OR, or alkyl from C.sub.1 to C.sub.12, M is zirconium or hafnium, R is alkyl from C.sub.1 to C.sub.12 or aryl from C.sub.6 to C.sub.12, R.sub.1 is R, alkaryl from C.sub.6 to C.sub.12, aralkyl from C.sub.6 to C.sub.12, hydrogen, or Si(R).sub.3, R.sub.2 is R.sub.1, halogen, COR, COOR, SOR, or SOOR, R.sub.3 is R.sub.2, OR, N(R).sub.2, SR, or a fused ring system, Cp is cyclopentadienyl, Cp* is pentamethylcyclopentadienyl, n is 0 to 3, and L.sub.B is an optional Lewis base. Also disclosed is a method of making a poly-.alpha.-olefin comprising polymerizing an .alpha.-olefin monomer using a catalyst such as that described above where M can be titanium, zirconium, or hafnium.

Se divulga un catalizador que tiene el ## general del ## STR1 del fórmula donde está un ligand L que tiene el ## L del ## STR2 del fórmula ' es L, Cp, Cp *, el fluorenyl del indenyle, NR.sub.2, O, o el halógeno, L se pueden tender un puente sobre a L; X es halógeno, NR.sub.2, O, o alkyl de C.sub.1 a C.sub.12, M es circonio o hafnium, R es alkyl de C.sub.1 a C.sub.12 o del aryl de C.sub.6 a C.sub.12, R.sub.1 es R, alkaryl de C.sub.6 a C.sub.12, aralkyl de C.sub.6 a C.sub.12, hidrógeno, o Si(R).sub.3, R.sub.2 es R.sub.1, halógeno, CORAZÓN, COOR, sor, o SOOR, R.sub.3 es R.sub.2, O, N(R).sub.2, SR, o un sistema fundido del anillo, el Cp es el cyclopentadienyl, Cp * es el pentamethylcyclopentadienyl, n es 0 a 3, y L.sub.B es una base opcional de Lewis. También se divulga un método de hacer un poly-.alpha.-olefin que abarca polimerizando un monomer del alpha.-alpha.-olefin usando un catalizador tal como eso descrita arriba donde M puede ser titanium, circonio, o hafnium.

 
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