Lithium-dimethylamino-hydrido-aluminate: Lösungszustand in Diethylether, Tetrahydrofuran und Dimethyldiglykolether / Lithium Dimethylamino Hydrido Aluminates: The Solution State in Diethylether, Tetrahydrofuran and Dimethyldiglycol Ether

Abstract

Abstract The reaction of LiAlH4 with dimethylamine has been studied in THF, diglyme and diethyl ether solution covering the molar ratios 1:0.5 to 1:4. In all cases the stoichiometric amount of H2 s evolved. With the exception of LiAl[N(CH3)2]4 all other members of the series LiAlH4-n[N(CH3)2]n cannot be isolated. They are in equilibrium with one another in solution, these equilibria are independent of the solvent used. The structure of compound LiAl[N(CH3)2]4 · 2(OC4H8) has been determined by X-ray diffraction. The anion acts as a bidentate ligand to Li which is also bonded to the oxygen atoms of two THF molecules.