An improved method of preparation of diarylchloronium and diarylbromium ions is described from their corresponding arenediazoniurn ions by decomposition in haloarenes in the presence of trifluoro-(trichloro-) acetic acid or 2, 2, 2-trifluoroethyl alcohol. I3C NMR spectroscopic study of the prepared halonium ions shows that nearly equal amounts of charge are transmitted into the two aryl rings regardless of the methyl substitution in one ...
