Group 8-10 complexes of pyridyl-phosphinimines and chiral bis-diiminophosphoranes.

摘要

A group of exocyclic pyridyl-phosphinimine ligands have been prepared in excellent yields by oxidizing trip henylphosphine with 2-azidomethylpyridines. These ligands reacted with group 8–10 transition metals to form various late transition metal complexes (e.g. [Ph₃P=NCH₂(2-Py)]NiBr ₂ 36) which have been characterized and evaluated for olefin polymerization activity. We found that these complexes are not active for ethylene polymerization or oligomerization. In a similar sense, nickel complexes 55 and 56 were synthesized by the reaction of nickel dihalide with a chiral bis-diiminophosphorane ligands. The corresponding ligand was prepared by deprotonation of R-2,2′ -diamino-1,1′-binaphthalenetriphenyldibromide by a strong base. The complexes were seemed to be inactive for ethylene polymerization, and were therefore not tested for α-olefins polymerization.