Neutral and Anionic Tricarbido Complexes of Gold(I)

Desilylation of [W(⋮CC⋮CSiMe3)(CO)2L] (L = HB(pz)3, HB(pz‘)3; pz = pyrazol-1-yl, pz‘ = 3,5-dimethylpyrazol-1-yl) with [Bu4N]F in the presence of [AuCl(PPh3)] provides the neutral complexes [W(⋮CC⋮CAuPPh3)(CO)2L] in addition to traces of the salt [Bu4N][Au(C⋮CC⋮W(CO)2{HB(pz)3})2]. The corresponding salt [N(PPh3)2][Au(C⋮CC⋮W(CO)2{HB(pz‘)3})2] may be obtained in high yield via the reaction of [W(⋮CC⋮CSiMe3)(CO)2{HB(pz‘)3}] with methanolic KOH in the presence of [AuCl(SMe2)].