Syntheses and dynamic NMR studies on 3-(1′-indenyl)propyl-N,N-bis(trimethylsylil)amine metal derivatives

The syntheses and characterisation of C9H6(X)(CH2)3N(SiMe3)2 (X=H (2), SiMe3 (4), Li (3)) are described. The reactions of 4 with TiCl4, [TiCp*Cl3] and NbCl5 led to the isolation of [Ti{N(H)(CH2)3C9H6SiMe3}Cl3] (5), [TiCp*{N(H)(CH2)3(C9H6SiMe3)}Cl2] (8) and [Nb{N(CH2)3(C9H6SiMe3)}Cl3]2·THF (9), respectively. The reaction of 3 with TiCl4 led to the ansa-bridged indenyl-amido complex [Ti{η5:σ,π(C9H6)(CH2)3N(SiMe3)}Cl2] (7) and with [Mo(CO)2(CH3CH2CN)2(C3H5)Cl] gave [{η5-C9H6(CH2)3N(SiMe3)2}Mo(CO)2(C3H5)] (10). Two conformers, corresponding to the limit orientations of the allyl ligand (endo and exo) have been identified in solution, by NMR. The activation parameters for the slow endo/exo isomerisation process were determined.