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further evidence concerning the mechanism from deuterium labeling in the products and from secondary deuterium isotope effects. We are also examining other similar systems for this effect." (10) An excited-state effect that we interpret as analogous to the interaction in intermediate IV has been reported by

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.

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