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.
Frost, C. G., Hartley, J. P., & Griffin, D. (2002). Counterion effects in indium-catalysed aromatic electrophilic substitution reactions. Tetrahedron Letters, 43(27), 4789-4791. https://doi.org/10.1016/S0040-4039(02)00931-0