Preparation of half-metallocenes of thiophene-fused and tetrahydroquinoline-linked cyclopentadienyl ligands for ethylene/α-olefin copolymerization
作者:Ji Hae Park、Seung Hyun Do、Anish Cyriac、Hoseop Yun、Bun Yeoul Lee
DOI:10.1039/c0dt00637h
日期:——
Directed ortho-lithiation of the lithium carbamates generated from tetrahydroquinoline or tetrahydroquinaldine enables one-step preparation of thiophene-fused and tetrahydroquinoline-linked cyclopentadienes [2-R1-3-R2-4,5-dimethyl-6-(2-R3-2,3,4,5-tetrahydroquinolin-8-yl)-4H-cyclopenta[b]thiophene (R1, R2, R3 = H or methyl)], from which titanium(IV) and zirconium(IV) complexes are prepared. The molecular structures of Me2Ti-complexes (12, R1 = R2 = Me, R3 = H; 14, R1 = R2 = R3 = Me) and Cl2Zr-complex (17, R1 = R2 = Me, R3 = H) are determined by X-ray crystallography. The Me2Ti-complexes, 14 and 15 (R1 = R3 = Me, R2 = H) show excellent activities (62 and 54 à 106 g/molTi·h) in ethylene/1-octene copolymerization, even when activated with small amount of MAO (Al/Ti = 1000).
来源于四氢喹啉或四氢奎啉胺的锂氨基甲酸盐的定向邻位锂化反应实现了硫烯烷基和四氢喹啉连接的环戊二烯的单步合成 [2-R1-3-R2-4,5-二甲基-6-(2-R3-2,3,4,5-四氢喹啉-8-基)-4H-环戊[b]硫烯 (R1, R2, R3 = H 或甲基)]。从中可以制备钛(IV)和锆(IV)络合物。通过X射线晶体学确定了Me2Ti络合物(12,R1 = R2 = Me,R3 = H;14,R1 = R2 = R3 = Me)和Cl2Zr络合物(17,R1 = R2 = Me,R3 = H)的分子结构。Me2Ti络合物14和15(R1 = R3 = Me,R2 = H)在乙烯/1-辛烯共聚合中表现出优异的活性(62和54 × 10^6 g/molTi·h),即使在仅用少量MAO激活(Al/Ti = 1000)的情况下也如此。