AbstractThe action of potassium amide in liquid ammonia on several methyl substituted 3‐ and 4‐bromo(chloro)pyridines, of 5‐bromo‐2‐t‐butylpyridine and of 3‐bromo (chloro) and 4‐bromo(chloro)‐2,6‐dimethylpyridine has been studied.The results of the reactions indicate the occurrence of derivatives of 3,4‐didehydropyridine as intermediates. An interpretation is given of the influence of the substituent and the hetero atom on the cou