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• W2000512985 abstract "Ni(C2H4)3 reagiert mit Alkalimetall-hydridotrialkylaluminaten bzw. -gallaten in Ether/THF oder Ether/Amin-Mischungen als Lösungsmittel unterhalb −70°C zu den thermisch labilen Verbindungen [MA(n-Donor)n]+[R3Al/GaHNi(C2H4)2]− (1–7, 9, 10) (MA = Li, Na; R = Me, Et, iBu). Bei der Umsetzung dieser 16e-Komplexe mit drei Äquivalenten CO werden die AlH-bzw. GaH-Bindungen so weit geschwächt, daß sich das Trialkylmetall vom Hydridwasserstoff ablöst und [Na(THF)4]+[HNi(CO)3]− (13) bildet. Dieses geht bei −50°C mit TMEDA in den Zweikern-Komplex [Na(TMEDA)2]+[HNi2(CO)6]− (14) über. Die thermische Zersetzung des Einkern-Komplexes 13 in Lösung führt zu [Na(THF)4]2+[Ni6(CO)12]2− (15, — Anhand 13C-NMR-spektroskopischer Daten lassen sich das Hydridoaluminat-Anion bzw. der Hydridwasserstoff in Nickel(0)-Komplexen bezüglich der σ-Donorstärke mit anderen σ-Donorliganden vergleichen. Die Ablösung von Trialkylaluminium bzw. -gallium ist darauf zurückzuführen, daß die Akzeptorstärke der Ni(CO)3-Gruppe größer ist als die des Ni(C2H4)2-Restes. On the Lewis Acidity of Nickel(0), IV. On the Reaction of Tris(ethene)nickel(0) with Alkali Metal Hydridotrialkylaluminates, -gallates, and -borates at −78°C Ni(C2H4)3 reacts with alkali metal hydridoaluminates and -gallates in ether/THF or ether/amine mixtures as solvents at temperatures below −70°C to produce the temperature-sensitive compounds [MA(n-Donor)n]+[R3Al/GaHNi(C2H4)2]− (1–7) (MA = Li, Na; R = Me, Et, iBu). When ethene in these 16-electron complexes is replaced by CO to form an 18-electron complex, the AlH and GaH bonds become so weak that trialkylaluminium and trialkylgallium are liberated. The reaction product is [Na(THF)4]+[HNi(CO)3]− (13), which reacts with TMEDA at −50°C to form the binuclear complex [Na(TMEDA)2]+[HNi2(CO)6]− (14). The mononuclear complex 13 decomposes in solution on warning to produce [Na(THF)4]2]+[Ni6-(CO)12]2− (15). — The σ-donor strength of the hydridoaluminate anion and the hydride ion in nickel(0) complexes can be compared with that of other σ-donors by 13C NMR spectroscopy. Trialkylaluminium or -gallium are liberated since the acceptor strength of Ni(CO)3 is greater than that of Ni(C2H4)2." @default.
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• W2000512985 title "Zur Lewis‐Acidität von Nickel(0), IV. Zur Reaktion von Tris(ethen)nickel(0) mit Alkalimetall‐hydriodotrialkylaluminaten, ‐gallaten und ‐boraten bei −78°C" @default.
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• W2000512985 doi "https://doi.org/10.1002/cber.19851180129" @default.
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