Cationic species derived from the η1-amidosilyl-η5-cyclopentadienyl dimethyl titanium complex. Crystal structure of [Ti{η5-C5H4SiMe2[η 1-N(2,6-Me2C6H3)]}{CH 2B(C6F5)2}(C6F 5)]

Article abstract of DOI:10.1016/S0022-328X(99)00340-X

Reactions of the η⁵-cyclopentadienyl-η¹-amido dimethyl titanium derivative [Ti{η⁵-C₅H₄SiMe₂[η ¹-N(C₆H₃Me₂)]}Me₂] (1) with tris(pentafluorophenyl)borane B(C₆F₅)₃ in hexane at room temperature yield a thermally stable bright yellow microcrystaline solid identified by elemental analysis as [Ti{η⁵-C₅H₄SiMe₂[η ¹-N(C₆H₃Me₂)]}Me{MeB(C ₆F₅)₃}] (2). A solution of 1 in CD₂Cl₂ at -78°C affords the ion-pair complex 2, while in C₆D₆ it is slowly converted into the new neutral complex [Ti{η⁵-C₅H₄SiMe₂[η ¹-N(C₆H₃Me₂)]}{CH ₂B(C₆F₅)₂}(C₆F ₅)] (3). Complex 3 is the unique product obtained after stirring compound 2 or a mixture of complex 1 and B(C₆F₅)₃ in toluene or benzene for 12 h at room temperature. The molecular structure of complex 3 has been determined by diffraction methods.