Metallocene lends a hand: Treatment of [bis(alkynyl)HfCp2] complexes with HB(C6F5)2 results in 1,1‐hydroboration and subsequent carbon–carbon coupling to yield the corresponding metallacyclopenta‐1,2‐diene derivatives (see structure of the trimethylsilyl derivative; Hf brown, B red, Si blue, F green, C black). X‐ray diffraction and a quantum chemical analysis reveal an electronic structure between a bent cyclic allene and a coordinated butenyne.