SYNTHESIS AND IMIDO-GROUP EXCHANGE-REACTIONS OF TERT-BUTYLIMIDOTITANIUM COMPLEXES

Treatment of TiCl4 with (BuNH2)-N-t (6 equivalents) followed by additi on of bpy (2 equivalents, 4-tert-butylpyridine) or pyridine (py) (2 or 4 equivalents) afforded the five- or six-co-ordinate tert-butylimido complexes [Ti(NBut)Cl-2(bpy)(2)] or [Ti(NBut)Cl-2(py)(n)](n=2 or 3) r espectively in good yields. Reaction of [Ti(NBut)Cl-2(py)(3)] with RNH 2 gave the corresponding arylimido derivatives [Ti(NR)Cl-2(py)(3)](R=P h, C6H4Me-4,* C6H4NO2-4,* C6H3Me2-2,6 or C6H3Pr21-2,6). Addition of t men or pmdien to [Ti(NBut)Cl-2(py)(n)](n=2 or 3 respectively) gave the corresponding bi- or tri-dentate amine complexes, [Ti(NBut)Cl-2(tmen) ] or [Ti(NBut)Cl-2(pmdien)] (tmen=Me2NCH2CH2NMe2, pmdien=N,N,N',N '', N ''-pentamethyldiethylenetriamine). Complexes labelled have been cry stallographically characterised.