Counterion effects in indium-catalysed aromatic electrophilic substitution reactions

Indium(III) triflamide (In(NTf2)3) has been prepared in high yield and has been demonstrated to be an efficient, recoverable catalyst for a range of aromatic electrophilic substitution reactions. When compared to other indium(III) complexes, anomalous reactivities suggest a non-innocent role for the counterion in the studied processes.