The aluminum chloride iodide LAlClI (2, L = HC[(CMe)(NAr)](2), Ar = 2,6-iPr(2)C(6)H(3)) has been synthesized to study the stepwise hydrolysis of this compound in the presence of 1,3diisopropyl-4,5-dimethylimidazol-2-ylidene as hydrogen halide acceptor. The isolation and characterization of the aluminum chloride hydroxide [LAlCl(mu-OH)](2) (3) and the dihydroxide LAl(OH)(2) (4) demonstrate the realization of a controlled hydrolysis.