The results show that the DEE and THF adducts of calcium tetrahydroaluminate can be prepared by ball milling under inert conditions or by mechanically assisted wet-chemical synthesis. For each process, the same metathesis reaction 2 can be applied. After separation from the byproduct by digesttion or Soxhlet extraction, the organic solvent can be removmoved
almost completely in a drying procedure under vacuum at elevated temperatures. Thus, gram amounts of calcium tetrahydroaluminate with a purity of >90% are obtained