Reactions of silylallyl-lithium or -potassium compounds with (BuCN)-C-t; synthesis and structures of [M{N(SiMe2R)C(Bu-t)(CH)(3)-SiMe2But}] [M = Li(tmen), R = Me; or M = K, R = Bu-t], [Li{N(SiMe3)C(Bu-t)CCHC(SiMe3)(CH2)(2)CH2}(tmen)] and [{Li[N = C(Bu-t)CHCHC(SiMe3)(CH2)(2)CH2]}(4)] (tmen = Me2NCH2CH2NMe2)

The reactions of a 1,3-bis(silyl)allyl-lithium-tmen or corresponding potass ium reagent with (BuCN)-C-t yielded the appropriate silyl migration product [Li{N(SiMe2R1)C(Bu-t)(CH)(3)SiMe2R2}(tmen)] (R-1 = R-2 = Bu-t, R-1= Me, R- 2 = Bu-t or R-1 = R-2 = Me), [Li{N(SiMe3)C(Bu-t)CCHC(SiMe3)(CH2)(2)CH2}(tme n)] or [K{eta(4)-N(SiMe2R1)C(Bu-t(CH)(3)SiMe2R2}] (R-1 = R-2 = Bu-t, R-1 = Bu-t, R-2 = Me or R-1 = R-2 = Me). The I,5-bis(silyl)-1-azapenta-2,4-dienyl lithium tmen-free analogues were obtained by lithiation of the correspondin g enamines. The reaction of 2-trimethylsilylcyclohexenyllithium with (BuCN) -C-t produced the imidolithium complex [{Li[N=C(Bu-t)CHCHC(SiMe3)((CH2)(2)C H2]}(4)]. Single crystal structures of four complexes have been determined.