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Ortho Lithiation of Tetrahydroquinoline Derivatives and Its Use for the Facile Construction of Polymerization Catalysts

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journal contribution
posted on 31.12.2007, 00:00 authored by Chun Ji Wu, Sang Hoon Lee, Hoseop Yun, Bun Yeoul Lee
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.