A “Cluster‐Centered” Acetylene‐Vinylidene Rearrangement

The isomerization tBuCCH→tBuHCC was achieved on the cluster Co2Ru (CO)9. Starting material and product were charterized by X‐ray structure analysis. It appears plausible that initial migration of the acetylenic H atom to the metal leads to formation of an acetylide complex, which then tautomerizes in a second step to the vinylidene complex.—Reactions of this type are interesting, inter alia, as models for catalytic processes on solid surfaces.