Unusual Anions [LAl(SH)(S)]^- and [LAl(S)₂]^2- Stabilized by Weakly Coordinating Imidazolium Cations. Synthesis of LAl(SSiMe₂)₂O (L = HC[C(Me)N(Ar)]₂, Ar = 2,6-<i>i</i>Pr₂C₆H₃)

Deprotonation of an Al−SH moiety has been achieved easily by using N-heterocyclic carbene as the base. Monomeric mono- and bis-imidazolium salts [CtH+][LAl(SH)(S)]- ([CtH+] = N,N‘-bis-tert-butylimidazolium), [CmH+][LAl(SH)(S)]-, and [CmH+]2[LAl(S)2]2- ([CmH+] = N,N‘-bismesitylimidazolium), containing unusual anions [LAl(SH)(S)]- and [LAl(S)2]2-, have been synthesized in nearly quantitative yields. Furthermore, [CmH+]2[LAl(S)2]2- has been successfully used for the preparation of LAl(SSiMe2)2O containing the [O(Me2SiS)2]2- ligand.