中性和阳离子二(叔丁基)环戊二烯基钛,锆和铪配合物的无配体的阳离子的动态NMR研究[M(1,3-吨卜2 - η 5 -C 5 H ^ 3)(η 5 -C 5 H 5)(CH 3)] +(M = Zr,Hf)
摘要:
含有二第4族金属配合物(叔丁基)环戊二烯基配位体(1,3-吨卜2 - η 5 -C 5 H ^ 3)已经被合成。1,3-和1,4-二(叔丁基)环戊二烯异构体的混合物与KH在THF中在-78°C下反应,得到盐K + [(1,3- t Bu 2 C 5 H 3)] -(THF)1-3 2为白色固体。用氯三甲基硅烷以1:1的摩尔比处理2,得到空气稳定的三甲基甲硅烷基环戊二烯基衍生物Si(1,3-t Bu 2 C 5 H 3)(CH 3)3 3。的甲硅烷基衍生物3是一个极好的前体的单环戊二烯三氯和锆化合物M(1,3-吨卜2 - η 5 -C 5 H ^ 3)氯3 [M =的Ti(4),锆(5)]。在NEt 3存在下将化学计量的水添加到4的甲苯溶液中,得到羰基三聚体化合物[Ti(1,3- t Bu 2 - η5 -C 5 H 3)Cl(μ- O)] 3 6。4与2equiv的反应。石灰,得到氯甲基衍生物的Ti(1
Synthesis of bis (tert-butyl)cyclopentadienyl derivatives of titanium and zirconium. NMR spectra and dynamic behaviour of the base-free [Zr(1,3-tBu2-η5-C5H3)(CH2Ph)2]+ cation
摘要:
Reaction of Si(1,3-(t)Bu(2)-C5H3)Me(3) with MCl(4) (M = Ti, Zr) in toluene or hexane at room temperature affords the new trichloromonociclopentadienyl-type derivatives [M(1,3-(t)Bu(2)-eta(5)-C5H3)Cl-3] (M = Ti (2), Zr (3)]. Treatment of complexes 2 and 3 with appropriate alkylating reagents in hexane gives the 1,3-di(tert-butyl)cyclopentadienyl trialkyl titanium and zirconium complexes [M(1,3-(t)Bu(2)-eta(5)-C5H3)R(3)][M = Ti, R = CH3 (4), CH(2)Ph (5); M = Zr, R = CH3 (6), CH(2)Ph (7), CH(2)CMe(2)Ph (8)]. Interestingly, when 2 reacts with 3.1 equivalents of LiCH(2)CMe(2)Ph in hexane at room temperature the ring-tert-butyl-metallated complex [Ti(1-(t)Bu-3-CMe(2)CH(2)-eta(5)-C5H3) (CH(2)CMe(2)Ph)(2)] (9) was isolated in 90% yield. The cationic mono(1,3-di-(tert-butyl)cyclopentadienyl dibenzyl zirconium species [Zr(1,3-(t)Bu(2)-eta(5)-C5H3)(CH(2)Ph)(2)](+), generated in situ by reaction of the tribenzyl complex 7 with B(C6F5)(3) or [CPh(3)](+)[B(C6F5)(4)](-) reagents, is reported and their dynamic NMR behaviour in CD2Cl2 solutions at low temperatures is studied.