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structure structure (organic substances) K 9000 -027Relative Stability and Structure of Dihydro-1,2,4-triazines: A Theoretical Study.-Among 9 possible dihydro-1,2,4-triazines, isomer (I) proves to be the most stable one as shown by comparison of calculated with experimental results concerning their relative stability. The stability of other isomers decreases in the order (II), (III), (IV), and (V). The preparation of isomers (VI), (VII), (VIII) and (IX) is increasingly more difficult if it is possible at all. -(NAGY, J.; NYITRAI, J.; VAGO, I.; CSONKA, G. I.; J.