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The cluster [Ru,(CO),,] reacts with 2-methylthiophene in refluxing tetrahydrofuran t o give products of oxidative addition b y C-H cleavage, [Ru,(p-H)(p-C,H,MeS)(CO),,](exo and endo), as well as t w o compounds derived by S-C bond cleavage, [ Ru,(p-C,H,Me) (CO),] and [Ru4(p3-S) (p-C,H,Me) (CO),,] (X-ray structure determined), this being the first example of the fragmentation of a thiophene t o leave both the inorganic and the organic fragments, S and C,H,Me, co-ordinated in the same organometallic compound.

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