N-Halosuccinimides and quaternary ammonium halides form both 1:1 and 2:1 complexes. Where two different halogen atoms are involved, the complex, in every case studied, has the more electronegative halogen atom associated with the quaternary ammonium ion and the less electronegative halogen atom bonded to the imide nitrogen. Where necessary a halogen interchange reaction occurs to satisfy this requirement. A mechanism for this halogen interchange reaction is proposed.

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