electrophilicity of 2a at the carbon atom connecting to the titanium atom. Interestingly, the reaction of zirconium and hafnium analogues (2b and 2c) with PMe3 and dmpe did not proceed. In contrast to the cases of phosphine reagents, pyridine which was found to undergo the nucleophilic attack toward the titanium center of 2a gave the pyridine-coordinated titanium-imide [Ti=NTbtC(Me)CHC(Me)N(Mes)}Cl(py)]
带有bearing叶立德部分[Ti = NTbt C(Me)(PR3)CH = C(Me)N(Mes)} Cl]的独特(1-氮杂-
2-丁烯基)
钛配合物(3-5,Tbt = 2通过PMe3,P(n-Bu)3和1,2-双(二
甲基膦基)的亲核攻击形成了4,4,6-三[双(三甲基
硅烷基)甲基]苯基,Mes = 2,4,6-三甲基苯基)
乙烷(dmpe)朝向相应的(1-氮杂-
1,3-丁二烯基)
钛配合物[Ti = NTbt C(Me)CHC(Me)N(Mes)}(mu-Cl)2Li(tmeda)] (2a)。
β-二酮化
锂[Li N(Tbt)C(Me)CHC(Me)N(Mes)}](1)与[TiIICl2(dmpe)2]的反应也导致形成相同的络合物5.密度泛函理论计算表明,模型分子3的负电荷稍微离域到
C3N平面。此外,对2a模型分子的计算表明,2a在与
钛原子连接的碳原子上具有亲电性。有趣的是,
锆和h