1,2,4-Triazines. XII. Syntheses of 5-carboxarnido-1,2,4-triazines via an addition-oxidation reaction

5-Unsubstituted 1,2,4-triazines, when treated with potassium cyanide suspended in moist dioxane afford 5-carhoxamido as well as 5,5′ -bi-1,2,4-triazinyl derivatives. A probable reaction sequence is described.