作者:Davide Balboni、Isabella Camurati、Giansiro Prini、Luigi Resconi、Simona Galli、Pierluigi Mercandelli、Angelo Sironi
DOI:10.1021/ic010018q
日期:2001.12.1
MtCl(4) (Mt = Ti, Zr, Hf). This simple, one-pot method produces the dimethylated complexes in higher overall yield, and saves on reaction time and solvents. Ind(2)MtMe(2) (1, Mt = Ti; 2a, Mt = Zr; 3, Mt = Hf), (4,7-Me(2)Ind)(2)ZrMe(2) (4), rac/meso-[C(2)H(4)(Ind)(2)]ZrMe(2) (5), meso-[C(2)H(4)(4,7-Me(2)Ind)(2)]ZrMe(2) (m-6a), and meso-[C(2)H(4)(4,7-Me(2)Ind)(2)]HfMe(2) (m-7a) have been prepared in
4族二甲基茂金属是用于烯烃聚合的甲基茂金属/硼酸盐催化剂体系的催化剂前体,它们通常通过母体茂金属二氯化物的甲基化(用MeMgCl或MeLi)制备。我们在这里描述了一系列简单的双茚基二甲基茂金属的制备,方法是使pi-配体与2倍过量的MeLi反应,然后再与MtCl(4)(Mt = Ti,Zr,Hf)反应。这种简单的一锅法可以较高的总收率生产二甲基化的配合物,并节省了反应时间和溶剂。Ind(2)MtMe(2)(1,Mt = Ti; 2a,Mt = Zr; 3,Mt = Hf),(4,7-Me(2)Ind)(2)ZrMe(2)(4), rac / meso- [C(2)H(4)(Ind)(2)] ZrMe(2)(5),内消旋-[C(2)H(4)(4,7-Me(2)Ind) (2)] ZrMe(2)(m-6a)和内消旋-[C(2)H(4)(4,7-Me(2)Ind)(2)] HfMe(2)(m-7a