| 摘要 |
Single site nitrogen and oxygen and metallacyclic catalysts comprising at least two polymerization-stable anionic ancillary ligands and a Group 3-10 metal are disclosed wherein the nitrogen or oxygen heterocyclic catalyst is produced by dimerizing an alkylamido or trimerizing a metal containing oxane. The polymerization-stable anionic ancillary ligands are preferably either cyclopentadienyl, borataaryl, pyrrolyl, azaboralinyl, pyridinyl, or a quinolinyl ring. In a preferred embodiment, the invention relates to catalysts of the formula (I) or (II) wherein M is a transition metal of Groups 3-10; L is a polymerization-stable anionic ancillary ligand; R is a hydrocarbyl group containing up to about 12 carbon atoms optionally substituted with halogen; and E is R or halogen, alkoxy from C1 to C20, siloxy from C1 to C20, N(R)2, hydrogen or another univalent anionic ligand, or mixtures thereof. |
