Chlorosilyl-cyclopentadienyl titanium precursors [Ti(η5-C5Me4SiMeXCl)Cl3] (X=H 2, Cl 3) were prepared by reaction of TiCl4 with the trimethylsilyl derivatives of the corresponding cyclopentadienes. Methylation of these compounds with MgClMe under appropriate conditions afforded the methyl complexes [Ti(η5-C5Me4SiMe2R)XMe2] (R=H, X=Cl 5, Me 6; R=X=Me 7). Reactions of 2 and 3 with two equivalents of
氯甲硅烷基环戊二烯钛前体钛[Ti(η 5 -C 5我4 SiMeXCl)氯3 ](X = H 2,氯3)通过的TiCl反应制备4与相应的环戊二烯的三甲基甲硅烷衍生物。得到甲基络合物的这些化合物与MgClMe适当条件下的甲基化钛[Ti(η 5 -C 5我4森达2 R)XME 2 ](R = H,X =氯5中,Me 6 ; R = X =我7) 。的反应2和3与灵两个当量吨卜得到柄-甲硅烷-η-酰胺化合物钛[Ti η 5 -C 5我4 SIMEX(η 1 -N吨丁基)}氯2 ](X = H 8,氯9)。的甲基化8,得到钛[Ti η 5 -C 5我4 SiMeH(η 1 -N吨丁基)}我2 ] 10。配合物8也可以通过8与BCl 3的反应获得,而相同的反应是使用氯化剂(TiCl 4,盐酸盐)导致脱酰胺,得到2,将其也被转换成3与Bcl由反应3。所有这些新化合物都通过NMR光谱进行了表征,并通过X射线衍射法确定了2和4的分子结构。
Effects of methyl substituents at the cyclopentadienyl ligand on the properties of C5H5TiCl3 and C5H5TiAl2Cl8-x(C2H5)x (x = 0–4) complexes
the complexes CpTiAl2Cl4Et4 became stable even with the excess of Et3Al. The CpTiAl2Cl8-xEtx complexes were also formed in the redoxreaction of non-dimerizing methylcyclopentadienes (Me3CpH/EtMe4CpH) with bis(di-μ-chloroalane)(benzene)titanium(II) complexes C6H6 · TiAl2Cl8-xEtx (x = 0–2). The reaction was found stoichiometric except for the perchloro complexes forming diamagnetic byproducts.
CpTiCl 3化合物系列中的甲基取代基(CP = Cp,MeCp,Me 3 Cp,Me 4 Cp,Me 5 Cp和EtMe 4 Cp)将其CT吸收带的位置从λ= 384 nm移至最大。438 nm并降低了乙基铝化合物对CpTiCl 3的还原速率,从而生成了三核CpTiAl 2 Cl 8- x Et x(x = 0-4)配合物。在CpTiCl 3 /过量的Et 2的AlCl系统还原率是由八面体提出中间CpTiEt的pseudomonomolecular分解控制(CL 2 ALET2)(Cl 3 AlEt)。在上述系列的CpTiCl 3化合物中,还原的速率常数从1.10×10 -3降低到6.15×10 -5 s -1。CpTiAl 2 Cl 8- x Et x络合物中的甲基取代基将电荷转移带移至更长的波长,dd跃迁至较短的波长,并且ESR g值远离自由电子值。通过用乙基取代氯铝酸盐配体中的外氯原子引起相反的变化。从Cp变为Me
Boroxide Complexes of the Group 4 Metals: A “Noninnocent” Ligand in Olefin Polymerization
作者:Sarah C. Cole、Martyn P. Coles、Peter B. Hitchcock
DOI:10.1021/om050202+
日期:2005.6.20
group 4 metal complexes supported by the boroxide anion, [OB(mes)2]-, is described and their application in α-olefin polymerization discussed. The compounds MOB(mes)2}2Cl2(THF)2 [1, M = Ti; 2, M = Zr; 3, M = Hf] have been synthesized from MCl4(THF)n [M = Ti, n = 0; M = Zr/Hf, n = 2] and 2 equiv of lithiated dimesitylborinic acid. Accidental hydrolysis during the preparation of the zirconium analogue afforded
Highly Efficient One-Step Direct Synthesis of Monocyclopentadienyltitanium Complexes
作者:Yuetao Zhang、Ying Mu
DOI:10.1021/om0508738
日期:2006.1.1
This report describes a highly efficient one-step synthetic strategy for monocyclopentadienyltitanium complexes by the direct reaction of TiCl4 with substituted cyclopentadienes, without adding any other reagents. This new synthetic method is particularly efficient for cyclopentadienes with a pendant group that can bond or coordinate to the Ti atom.
Titaniumcomplexes containing a linked isopropyl- or benzylamido(tetramethylcyclopentadienyl) ligand C5Me4SiMe2NR (R = iPr, CH2Ph,) and one bidentateorganylgroup C6H4(CH2NMe2)-2, CH2C6H4(NMe2)-2, and η5-C5H3(CH2NMe2)-2}Fe(η5-C5H5) were prepared by salt metathesis of the corresponding dichloro complex Ti(η5:η1-C5Me4SiMe2NR)Cl2 with the lithium organyl. Single crystal X-ray structural analysis of