Reaction of the hexanuclear cluster [Ru,C(CO),,] with trimethylamine N-oxide in CH,CI, containing cyclopentadiene yielded a variety of products including [Ru,C(C0),,(q5-C,H,),]1 and [RU~C(CO),,,(?~-C, H, ), ] 2 in moderate and modest yields, respectively. Compound 2 has also been isolated as a major product from a similar reaction of cyclopentadiene with [Ru,C(CO),,] and as a minor product from the reaction of cyclopentadiene with [ Ru,R hC( C0),,(q5-C5Me,)]. The molecular structures of compounds 1 and 2 have been determined b y X-ray diffraction, at 150 and 295 K, respectively.