| 초록 |
Organolithium compounds are powerful ligands in the organic synthesis. The ortho lithiation of N-alkylaniline derivatives may allow for a simple and efficient synthetic route for the o-phenylene bridged Cp/amide ligand system. Herein we report the conditions that lead to ortho lithiation and its utilization in the facile construction of various titanium complexes. Ortho lithiation is achieved by the treatment of tBuLi to the lithium carbamate compounds derived from 2-R-1,2,3,4- tetrahydroquinolines (R ) H, methyl, n-butyl, tert-butyl, and 6-tert-butoxyhexyl), which enables the facile construction of the o-phenylene-bridged (Me4C5, indenyl, or fluorenyl)/amido titanium complexes. The titanium complex derived from 2-methyltetrahydroquinoline exhibits higher activity, higher 1-octene incorporation, and higher molecular weight in ethylene/1-octene copolymerization than the standard CGC, [Me2Si(η5-Me4C5)- (NtBu)]TiCl2. |
