| abstract |
Disclosed is a catalyst having general formula (I), where Q is a ligand containing the ring (II), R is hydrogen, N(R')2, OR', or R', each R' is independently selected from alkyl from C1 to C10, aryl from C6 to C15, alkaryl C7 to C15, and aralkyl from C7 to C15, each X is independently selected from hydrogen, halogen, alkoxy from C1 to C10, dialkylamino from C1 to C10, methyl, (III), each R1 is independently selected from halogen, alkoxy from C1 to C10, and R', L is (IV), (V), (VI), (VII), (VIII), Q, or X, where L can be bridged to Q, B is an optional base, 'n' is 0 to 5, and M is titanium, zirconium, or hafnium. |