A simple, high-yielding synthesis of 2-methyl-1,3-dithi- olium tetrafluoroborates is reported. The reaction of these salts with N,N-dimethylformamide and acetic anhydride gives rise to the pre- viously unreported N,N-dimethyl 2-(1,3-dithiol-2-yliden)ethyliden- iminium tetrafluoroborates.