Ring transformations in reactions of heterocyclic compounds with nucleophiles (IX). Conversion of N‐methylpyrimidinium salts in pyridines by carbanions

On treatment with active methylene compounds in basic media the quaternary pyrimidinium salts, i.e. methyl l‐methylpyrimidinium sulfate, 1‐methyl‐4‐phenylpyrimidinium iodide and 1‐methyl‐5‐phenylpyrimidinium iodide are converted into pyridine derivatives. The mechanism of the reaction is discussed.