Rearrangement of carbocations derived from 1,8-bis(dimethylamino)naphthyl-2-methanols into 4-R-1,1,3-trimethyl-2,3-dihydroperimidinium salts

α-Phenylated 1,8-bis(dimethylamino)-2-naphthylmethyl carbocations have been shown to rearrange into 4-R-1,1,3-trimethyl-2,3-dihydroperimidinium cations through an intramolecular hydride shift from the 1-NMe₂ group.