Einen P6Ni2‐Tricyclus enthält der neuartige Komplex 1, in dem erstmals P3‐Ringe als Vierelektronenliganden mit Carbonylmetall‐Fragmenten zu einem P4M2‐Ring verknüpft sind. Aus (PiPr)3 und Ni(CO)4 entsteht außer 1 das ebenfalls isolierbare „anti”︁‐Isomer
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