Reaction of the heteronuclear cluster Cp*IrOs3(μ-H)4(CO)9 with alkynes: An unusual case of amine activation

Reaction of the heteronuclear cluster Cp∗IrOs3(μ-H)4(CO)9 with alkynes is activated by excess amine to afford the butterfly clusters Cp∗IrOs3(CO)9(RCCR′); hinge-apex isomers are formed. In the case of PhCCH, another cluster Cp∗IrOs3(CO)9(CCHPh)2, which contained two alkenyl moieties was also isolated.