ABSTRACT:The group 11 hydride clusters [Ag 6 H 4 (dppm) 4 (OAc) 2 ](1) and(2) (dppm = 1,1-bis(diphenylphosphino)methane) were synthesized in moderate yields from the reaction of M(OAc) (M = Ag, Cu) with Ph 2 SiH 2 , in the presence of dppm. Complex 1 is the first structurally characterized homometallic polyhydrido silver cluster to be isolated. Both 1 and 2 catalyze the hydrosilylation of (,-unsaturated) ketones. Notably, this represents the first example of hydrosilylation with an authentic silver hydride complex.