o-Phenylene-bridged Cp/sulfonamido titanium complexes for ethylene/1-octene copolymerization
作者:Dae June Joe、Chun Ji Wu、Taekki Bok、Eun Jung Lee、Choong Hoon Lee、Won-Sik Han、Sang Ook Kang、Bun Yeoul Lee
DOI:10.1039/b605345a
日期:——
The Suzuki-coupling reaction of 2-(dihydroxyboryl)-3,4-dimethyl-2-cyclopenten-1-one (1) and 2-(dihydroxyboryl)-3-methyl-2-cyclopenten-1-one (2) with 2-bromoaniline derivatives affords cyclopentenone compounds (3–8) from which cyclopentadiene compounds, 4,6-R′2-2-(2,5-Me2C5H3)C6H2NH2 (9–11) and 4,6-R′2-2-(2,3,5-Me3C5H2)C6H2NH2 (12–14) are prepared. After sulfonation of the –NH2 group with p-TsCl, metallation is carried out by successive addition of Ti(NMe2)4 and Me2SiCl2 affording o-phenylene-bridged Cp/sulfonamido titanium dichloride complexes, [4,6-R′2-2-(2,5-Me2C5H2)C6H2NSO2C6H4CH3)]TiCl2 (R′ = H, 21; R′ = Me, 22; R′ = F, 23) and [4,6-R′2-2-(2,3,5-Me3C5H)C6H2NSO2C6H4CH3)]TiCl2 (R′ = H, 24; R′ = Me, 25; R′ = F, 26). The molecular structures of 24 and [2-(2,5-Me2C5H2)C6H4NSO2C6H4CH3)]Ti(NMe2)2 (27) are determined by X-ray crystallography. The Cp(centroid)–Ti–N angle in 24 is smaller (100.90°) than that observed for the CGC (constrained-geometry catalyst), [Me2Si(η5-Me4Cp)(NtBu)]TiCl2 (107.6°) indicating a more “constrained feature” in 24 than in the CGC. Complex 24 shows the highest activity among the newly prepared complexes in ethylene/1-octene copolymerization but it is slightly inferior to the CGC in terms of activity, comonomer-incorporation ability, and molecular weight of the obtained polymers.
2-(二羟基硼基)-3,4-二甲基-2-环戊烯-1-酮(1)和2-(二羟基硼基)-3-甲基-2-环戊烯-1-酮(2)的Suzuki偶联反应2-溴苯胺衍生物提供环戊烯酮化合物 (3–8),由环戊二烯化合物 4,6-R'2-2-(2,5-Me2C5H3)C6H2NH2 (9–11) 和 4,6-R'2-2制备-(2,3,5-Me3C5H2)C6H2NH2 (12–14)。用 p-TsCl 磺化 –NH2 基团后,通过连续添加 Ti(NMe2)4 和 Me2SiCl2 进行金属化,得到邻亚苯基桥联的 Cp/磺酰胺二氯化钛络合物,[4,6-R'2-2 -(2,5-Me2C5H2)C6H2NSO2C6H4CH3)]TiCl2 (R' = H, 21;R' = Me, 22;R' = F, 23) 和 [4,6-R'2-2-(2,3 ,5-Me3C5H)C6H2NSO2C6H4CH3)]TiCl2 (R' = H, 24;R' = Me, 25;R' = F, 26)。 24 和 [2-(2,5-Me2C5H2)C6H4NSO2C6H4CH3)]Ti(NMe2)2 (27) 的分子结构通过 X 射线晶体学测定。 24 中的 Cp(质心)-Ti-N 角 (100.90°) 比 CGC(约束几何催化剂)[Me2Si(η5-Me4Cp)(NtBu)]TiCl2 (107.6°) 观察到的更小,表明24 中的“受限特征”比 CGC 中的“受限特征”要多。在新制备的配合物中,配合物24在乙烯/1-辛烯共聚中表现出最高的活性,但在活性、共聚单体掺入能力和所得聚合物的分子量方面略逊于CGC。