| abstract |
A catalyst composition comprising a bis-amide compound represented by formula (2) or a dimer thereof and a second component is provided.n n n (2)n n n n n n n n In this formula,n n n M is zirconium, hafnium or titanium,n n n Each N is a three-coordinate nitrogen atom,n n n Each Y is Si, Ge or Sn,n n n Each X is independently a hydride or R,n n n Each R is independently hydrocarbyl in which one or more carbon atoms can be replaced by an element selected from Si, O, P, N and S,n n n Q is a neutral Lewis base,n n n and m is a number of 0 to 2.n n n Preferably, the second component is a compound which is substantially non-degradable under the reaction conditions and can provide a bulky and unstable anion [A] - containing at least one boron atom. Also provided are methods of oligomerization or co-oligomerization of alpha olefins in the presence of such catalyst compositions. |