Conclusions
The triphenyloxonium cation is brominated only in the presence of anhydrous AgBF4 in which the first Br atom enters into each benzene ring almost exclusively in the para position to the onium center, but the tris(4-bromophenyl)oxonium cation thus formed is readily brominated further under the same conditions with the formation of tris(3,4-dibromophenyl) oxonium borofluoride.
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Translated from Izvestiya Akademii Nauk SSSR, No. 6, pp. 1392–1395, June, 1984.
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Tolstaya, T.P., Vanchikova, L.N. & Lisichkina, I.N. Bromination of triphenyloxonium cations. Russ Chem Bull 33, 1282–1285 (1984). https://doi.org/10.1007/BF00949002
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DOI: https://doi.org/10.1007/BF00949002