[{(C5H5)Co}3(C6H5CHCHCH3)], an Organometallic Cluster with a Face‐Bridging Arene Ligand

In contrast to the two only known complexes with μ3-η2: η2: η2arene ligands and to benzene on densest packed metal surfaces the title complex 1 exhibits almost complete bond length equalization in the aromatic ring. 1 can be prepared in a one-pot reaction from [CpCo(C2H4)2] and trans-β-methylstyrene or allylbenzene.