Azomethine derivatives. Part XVI. Some diphenylmethyleneaminosilanes and di-t-butylmethyleneaminosilanes

Abstract

Reactions between the chlorosilanes, Me_nSiCl_{4 –n}(n= 0–3), and di-t-butylmethyleneaminolithium, Bu^t₂C:NLi, afford the mono(alkylideneamino)silanes, Bu^t₂C:NSiMe_nCl_{3 –n}, even when an excess of Bu^t₂C:NLi is used. These alkylideneaminosilanes have i.r. and ¹H n.m.r. spectra consistent with linearity of their C:NSi skeletons, as appropriate for maximum N[graphic omitted]Si (p→d)π-bonding. Analogous reactions between equimolar proportions of Me_nSiCl_{4 –n}(n= 0–2) and Ph₂C:NLi afford the di(alkylideneamino)silanes (Ph₂C:N)₂SiMe_nCl_{2 –n}, apparently through disproportionation of the mono-substituted compounds Ph₂C:NSiMe_nCl_{3 –n} which could be isolated only when n= 2. The spectra of the diphenylmethyleneaminosilanes show that these may have bent C:NSi skeletons.