Optisch aktive übergangsmetall-komplexe: LXXXIII. Konfigurationsstabile tetraedrische NiNi′CC′-cluster

The reaction of Ni(C₅H₅)₂ and Ni(C₅H₄COOCH₃)₂ with the acetylene (?)-(R)-C₆H₅CCCONHCH(CH₃)(C₆H₅)(C₆H₅), “CC′”, yields tetrahedral Ni₂C₂ clusters. Besides the compounds with two identical Ni corners (Ni₂CC′ types) also compounds with two different Ni corners (NiNi′CC′ types) are formed. These consist of two diastereomers which, for a given (R)-configuration in the acid amide substituent, differ only in the cluster chirality. They are separated chromatographically and turn out to be configurationally stable with respect to a change of the cluster chirality.