Reactions of Alkylamino- and Dialkylaminotriphenylphosphonium Halides with Halogens and Interhalogen Compounds; Formation of Alkylaminotriphenylphosphonium Polyhalides

Alkylaminoand cycloalkylaminotriphenylphosphonium halides react with elemental halogens or interhalogen compounds to afford alkylaminoor cycloalkylaminotriphenylphosphonium trihalides. The stability of these trihalides depends on the cation as well as the trihalide anion. The assignment of a trihalide structure to these compounds was based on elemental analysis and on IRand Raman spectroscopic evidence. Most stable are the tribromide and [1X2]° salts. During all reactions involving N-alkylaminoand N-cycloalkylaminotriphenylphosphonium halides and elemental halogens an N-halogenation of the cation was not observed.