Synthetic approaches have been described for the preparation of precursors to triasterane trications and related carboxenium ions. The investigation on carbocationic
intermediates from treatment of these precursors with FSO H/SbF /SO CIF system has led to the preparation and 13C-NMR spectroscopic characterization of the isomeric 3,7,9-tri-hydrote-tracyclo [3. 3.1. 0 . 0 ] nonane-3,7,9-triyltrications.