Dimethyl-4H-1,3,4-thiadiazines, novel 8p heterocyclic systems, were prepared by cyclization of a-haloketones with 1,2,4-trialkylthiosemicarbazides. The desulfurization of the products afforded 5-imino-1,2-dimethylpyrazoles by valence isomerization into thia-s-homopyrazoles.
7H‐1,2,4‐Triazolo[3,4‐b][1,3,4]‐ , thiadiazine wie (III), die bisher durch Umsetzung der 4‐Amino‐5‐mercapto‐1,2,4‐triazole (I V) mit den α‐Halogencarbonyl‐Verbindungen (V) dargestellt wurden, sind auch durch Behandlung der Titelverbindungen (I) mit den Orthocarbonsäureestern (II) erhältlich.
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