The exchange of terminal metal oxo functionalities by N-organo and N-sulfonylimido functionalities viametathesis with bent, thus very reactive sulfinyl amines R-NSO and sulfinyl sulfonylamides R-SO2-NSO is described. It is demonstrated that in many cases sulfinyl amine metathesis offers a more convenient entry into imido complex synthesis than the much better investigated isocyanate metathesis at oxo complexes or condensation ...