Zur Lewisacidität von Nickel(0): VII. Alkalimetall-μ3-hydrido-tetrakis(ethen)diniccolat(0)-Komplexe: (pmdta) Li(μ3-H)Ni2(C2H4)4 und (pmdta)Na(μ3-H)Ni2(C2H4)4

Abstract Ni(C 2 H 4 ) 3 reacts with alkalimetal hydridoaluminates or -gallates M A HAl/GaR 3 and M A H 2 AlR 2 (R= alkyl) in ether/pmdta at temperatures between −70 and −20°C to yield the ion pair complexes (pmdta)M A (μ 3 -H)Ni:(C 2 H 4 ) 4 (M A = Li ( 2a ), Na ( 2b )). According to their structure and chemical properties, 2a,b can be regarded as model compounds for the nickel(O) induced addition of alkalimetal hydrides to alkenes.