Über die Reindarstellung des Bromchlorids und dessen Verhalten in Acetonitril

The Preparation of Pure Bromine Chloride and on its Behaviour in Acetonitrile. Pure bromine chloride has successfully been prepared from bromine and chlorine. The bromine was quantitatively chlorinated in solution of difluordichlormethane with a large exess of chlorine at ?79°C under irradiation with U.V. light. The bromine chloride so obtained was removed from equilibrium by precipitation under cooling to ?120 to ?110°C. The solvent and the exess chlorine then were destillad at the same temperature under high vacuum, the system being detached from vacuum as soon as the residue was dry. Using a temperature difference of 1°, the orange-coloured crystalline powder could bee sublimated at ?79°C, the resulting beautiful, orange-coloured crystals (m. p. ?56,5°C) being completely stable in a trap at ?79°C. In acetonitrile as solvent, bromine chloride is stable even at room temperature because of the formation of an adduct with the solvent. In these solutions exists the ionic equilibrium 2 BrCl_solv?Br + BrCl.