Abstract
In this study, hydrogen desorption from LiAlH 4 in HMPA solution was investigated. One equiv. H atom per LiAlH 4 was evolved from the solution at ambient temperature. Heating the solution to ∼90 °C led to the evolution of three more H atoms. Unlike the solid-state thermal decomposition, LiAlH 4 in solution does not decompose to the Li 3AlH 6 intermediate. In fact, Li 3AlH 6 was found to be unstable in HMPA. Two equiv. H atoms were found to detach from Li 3AlH 6 upon mixing it with HMPA at ambient temperature. Subsequent heating of the resulting solution to 90 °C resulted in the dehydrogenation of ca. 4 equiv. H atoms.
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