The synthesis, structure, and ethylene polymerization of dimeric salicylaldiminato titanium complexes

摘要

A series of dimeric titanium complexes bearing salicylaldiminates, [4-R-6-~tBu-2-(CH=N~nBu)C_6H_2OTiCl_2(u-Cl)]_2 [R = H (1);;R = ~tBu (2); R = NO_2 (3)], have been synthesized in high yield (> 90%) by the reaction of corresponding 4-R-6-~tBu-2-(CH=N~nBu)C_6H_2OSiMe_3 with TiCl_4. The molecular structure of 2 has been confirmed by single-crystal X-ray diffraction analysis. When activated with methylaluminoxane, these complexes exhibit good catalytic activity for ethylene polymerization.