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

Abstract

Reactive E = C(p‐p)π Systems, XXXIII. — Side‐on Coordination of the Phosphaalkyne P ≡ C — N( i Pr) 2 in the 16e Nickel(0) Complex Ni(CO)PCy 3 [PCN( i Pr) 2 ] The reaction of (diisopropylamino)phosphaethyne P ≡ C — N( i Pr) 2 with the nickel complex [Ni(CO) 3 PCy 3 ] – in contrast to the analogous reactions with Ni(CO) 4 or Ni(CO) 3 PR 3 (R = Me, Ph) – leads to the novel 16e nickel(0) system [Ni{η 2 ‐P ≡ C — N( i Pr 2 )}(CO)PCy 3 ] 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.