Synthesis and characterization of the binuclear diamido titanium chalcogenides [(Ar)NCH2CH2CH2N(Ar)]2Ti(µ-E)2 (E = Se, Te)
摘要:
McConville的螯合氨基钛配合物[(Ar)NCH2CH2CH2N(Ar)]Ti(CH3)2 (Ar = 2,6-i-Pr2C6H3) 分别与单质Se或镓源Te=PBu3反应,形成双-µ-硫族化合物二聚体[(Ar)NCH2CH2CH2N(Ar)]2Ti(µ-E)2 (E = Se, 2; Te, 3),同时失去EMe2。二聚体2和3通过光谱和X射线晶体学表征,两种化合物在固态下同构。镓化二聚体3也可通过还原二氨基二氯化物[(Ar)NCH2CH2CH2N(Ar)]2TiCl2后再用Te=PBu3处理制备。该二聚体对进一步的Te=PBu3或锡烷如HSnBu3不具有反应性。与十甲基二茂钛衍生物不同,二氨基配合物不是Te=PBu3和HSnBu3的杂原子脱氢的有效催化剂前体。关键词:二氨基钛配合物,硒化物,碲化物。
Living Polymerization of α-Olefins: Catalyst Precursor Deactivation via the Unexpected Cleavage of a B−C<sub>6</sub>F<sub>5</sub> Bond
作者:John D. Scollard、David H. McConville、Steven J. Rettig
DOI:10.1021/om961034b
日期:1997.4.1
The titanium diamide complex [ArN(CH2)(3)-NAr]TiMe2 (1a; Ar = 2,6-(Pr2C6H3)-Pr-i) reacts with B(C6F5)(3) in pentane to give an insoluble yellow-orange solid (2a). Comp2es 2a is ct catalyst for the living polymerization of 1-hexene. Pentane suspensions of 2a slowly evolve methane over the course of several hours to give the new penfane-soluble derivative [ArN(CH2)(3)NAr]Ti[CH2B-(C6F5)(2)](C6F5) (3a), which teas structurally characterized. Addition of a B-C6F5 group across an intermediate Ti=CH2 unit is proposed. Compound 3a is inactive for the polymerization of alpha-olefins.