Few Onium Ion Lewis acid/pi-HOMO Lewis acid complexes are known because it is likely that a ligand will rapidly transfer from the Onium Ion to the pi-HOMO Lewis base. The effect will be to alkylate or protonate the pi-System, depending upon the nature of the ligand. For more information look in the Chemogenesis
webbook sections on Lewis
acids and Lewis bases and the Lewis
acid/base interaction matrix.