Synthesis and characterization of stable betainic pyrimidinaminides

Abstract Depending on electronically or kinetically stabilizing effects determined by the substitution pattern or the reaction conditions, 6‐amino substituted (5‐chloropyrimidine‐2,4‐diyl)bis(hetarenium) salts or 5‐chloro‐2,6‐bis‐(pyridinio)‐pyrimidin‐4‐aminides are formed on nucleophilic substitution of 4‐(dimethylamino)pyridine, 4‐(pyrrolidin‐1‐yl)pyridine, or 1‐methylimidazole on 4‐amino substituted 2,5,6‐trichloropyrimidines.