Preparation of Organic Dications by Protonation of Iminium‐Salts. – NMR‐Spectroscopic Evaluation of the Topomerisation Barriers in the Bis(dimethylamino)‐dimethylammonio‐carbeniumion1,3‐Bis(dimethylamino)‐2‐aza‐2‐propenylium‐chloride (4a) is protonated by inorganic acids as HCl, HBr, HI, H2SO4, HBF4and HClO4to give the corresponding 1,3‐bis(dimethylamino)‐2‐azapropan‐1,3‐diylium‐salts (7a–f) which are isolated and characterized by elemental analysis and their1H‐NMR‐spectra.N, N, N′, N′, N″, N″‐Hexamethylguanidinium‐chloride (5a) can be protonated only by super acid systems e.g. HFSO3/SbF5. The dication thus formed presents3topomerisation barriers. Two of them are explained as restricted rotations, whereas the