(2a–2h) pyridinium chlorides. Reaction of these chlorides with NaOH produces the corresponding 4‐pyridones. All the chlorides synthesized showed antibioticactivity. Particularly high activity against microbes representing cocci, rods, fungi, and bacilli was shown by 1‐cyclododecyloxymethyl‐4‐dimethylaminopyridinium chloride 1d and 1‐[(1‐dodecyloxy)ethyl]‐4‐dimethylaminopyridinium chloride 2f.