Abstract
Solute aluminium chloride undergoes slow exchange of radiochlorine with liquid phosgene. A solvate of composition COCl 2. AlCl 3 was prepared, and the chlorines of the phosgene and aluminium chloride parts were shown to be non-equivalent. It was found that calcium chloride, sodium chloride, and cesium chloride undergo very little heterogeneous exchange with liquid phosgene. Ionic chlorides allowed to react with a solution of aluminium chloride do not catalyse exchange of the latter with the solvent. Ionic chlorides undergo reaction by transferring chloride ions directly to aluminium chloride, and not to the solvent as the postulates of the solvent system formulation of acids and bases would require. It is suggested that: (1) The active agent in aluminium chloride solutions is aluminium chloride itself, not CO ++ or COCl +; (2) The Lewis theory of acids and bases can better be applied to the phosgene solutions than can the theory of solvent systems.
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