Patent ID: 8084385

Claim:
A catalyst useful for polymerizing olefins, comprising an activator and a complex of the structure: wherein M is a Group 4 metal; Z is a divalent linking group selected from the group consisting of methylene, ethylene, isopropylidene, dialkylsilylene, 1,2-phenylene, 1,8-naphthylene, and α,2-benzylene; X is N or O; each of R 1 and R 2 is independently C 1 -C 4 alkyl or C 6 -C 10 aryl; R 1 and R 2 can be joined together; n is 0 when X is O, and n is 1 when X is N; each Y is independently halide, alkyl, dialkylamido, aryl, or aralkyl; provided that: (a) when M is Zr, Z is not methylene or dialkylsilylene; (b) when M is Zr and Z is α,2-benzylene, X is N; (c) when M is Zr and Z is 1,8-naphthylene, X is N; and (d) when M is Ti and Z is 1,8-naphthylene, X is O.