Abstract Some N-silylamides N-silylurethanes were studied by 29 Si and 13 C NMR. All the silylamides investigated exist in an amide-imidate equilibrium. The amide form is favoured by electron-donating groups at N and by decreasing temperatures. The free enthalpy of activation for the Si O-Si N exchange is 15.6 kcal mol− 1 for Np-tolyl-N- trimethylsilylacetamide. Broadening of the lines of the amide form in the 13 C NMR ...
