Synthesis and Structure of N-Silyl-Substituted the Lithium, Iron(I) and Cobalt(II) 1-Azaally Complexes

The N-silyl-N-i-1-(2-((dimethylamino)methyl)benzyl)-N,N,1,1-tetramethylsilanamiolithium 1-azaally compound [{(Me-2)NCH2C6H4}CHC(Bu-t)NSiMe2(NMe2)Li(TMEDA)] (1) was synthesized by interaction of [(Me-2)NCH2C6H4 CHSiMe2(NMe2)]Li(TMEDA) with one equivalent of tertbutyronitrile ((BuCN)-Bu-t). The derivative iron(II) and cobalt(II) compounds were produced by the treatment of 1 with FeCl2 or CoCl2 in tetrahydrofuran or diethylether at zero temperature, respectively, with the general formula M[{(Me-2)NCH2C6H4}CHC(Bu-t)NSiMe2(NMe2)](2) (M=Fe (2), Co (3)). The 1-azaally complexes 1, 2 and 3 were also characterized by X-ray single crystal diffraction and NMR analysis. Structural analyses of 2 and 3 reveal that their molecular structures are very similar. The structure of the centrosymmetric crystalline Fe(I) or Co (II) is unusually within the present series of homoleptic metal(II) 1-azaallyls in that it is an kappa(1)-enamido metal complex. CCDC: 771795, 1; 771796, 2; 771797, 3.