Reaktive E = C(p‐p)π‐Systeme, XXXIII. Side‐on‐Koordination des Phosphaalkins P ≡ C — N(iPr)2 im 16e‐Nickel(0)‐Komplex Ni(CO)PCy3[PCN(iPr)2]

Reactive E = C(p‐p)π Systems, XXXIII. — Side‐on Coordination of the Phosphaalkyne P ≡ C — N(iPr)2 in the 16e Nickel(0) Complex Ni(CO)PCy3[PCN(iPr)2] The reaction of (diisopropylamino)phosphaethyne P ≡ C — N(iPr)2 with the nickel complex [Ni(CO)3PCy3] – in contrast to the analogous reactions with Ni(CO)4 or Ni(CO)3PR3 (R = Me, Ph) – leads to the novel 16e nickel(0) system [Ni{η2‐P ≡ C — N(iPr2)}(CO)PCy3] with a planar geometry of all skeleton atoms besides the methyl and cyclohexyl groups. Side‐on coordination of the P ≡ C triple bond results in an increase of the PC distance to 1.665 Ȧ typical for phosphaalkenes.