Heteronuclear 3 d/Dy III Coordination Clusters as Catalysts in a Domino Reaction

Three isoskeletal tetranuclear coordination clusters with general formula [M II 2 Dy III 2 L 4 (EtOH) 6 ](ClO 4 ) 2 ⋅2 EtOH, (M=Co, 1 ; M=Ni, 2 ) and [Ni II 2 Dy III 2 L 4 Cl 2 (CH 3 CN) 2 ]⋅2 CH 3 CN ( 3 ), have been synthesized and characterized. These air‐stable compounds, and in particular 3 , display efficient homogeneous catalytic behavior in the room‐temperature synthesis of trans ‐4,5‐diaminocyclopent‐2‐enones from 2‐furaldehyde and primary or secondary amines under a non‐inert atmosphere.