The arene-solvated indium(I) species [In(C7H8)(3)]-[CHB11Cl11] (1) and [In(C6H5Br)(1.5)][CHB11Cl11] (2) were obtained by a redox reaction involving the silver salt Ag[CHB11Cl11] and indium powder at 80 degrees C in a toluene or bromobenzene solution. These thermally stable compounds react with triphenylphosphine and the N-heterocyclic carbene 1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene under reduction of indium(I) to indium metal and oxidation of the ligands to phosphonium and imidazolium cations contrary to the more commonly observed disproportionation reactions. The presence of 2 equiv of carbene led to deprotonation of the anion to give the dianion [CHB11Cl11](2-). Interactions of In+ with soft donor ligands such as phosphines, olefins, alkynes, and aromatics are weak, and a crystalline solid was only obtained with the nonvolatile phosphinoacetylene Mes(2)PC CPh (Mes = 2,4,6-Me3C6H2). The structure of this compound displays In center dot center dot center dot C interactions involving the triple bond and the pi system of one mesityl group but no In center dot center dot center dot P contact. Solutions of 2 in fluorobenzene also showed moderate activity as the catalyst for intramolecular hydroamination of primary and secondary aminopentenes. The new compounds were characterized by multinudear NMR spectroscopy and X-ray diffraction for compounds 1, 2, and 4-6.