The versatility and synthetic potential of the novel tris-acetonitrile-subs
tituted cluster Ru-3(CO)(9)(MeCN)(3) (3) for the formation of ruthenaborane
s in unprecedently high yields are illustrated. Reaction of 3 with [Me4N][B
3H8] yields HRu3(CO)(9)B2H5 (65%) and with BH3.THF yields HRu6B(CO)(17) (60
%).