The oxygen–carbonyl isomeric sydnone (V) has been synthesized from 1-benzoyl-1-methyl-hydrazine hydrochloride (VII) and phosgene. The isosydnone V itself reacts with phosgene to form 2-chloro-5-phenyl-1,3,4-oxadiazole (VI), a new substituted 1,3,4-oxadiazole. Thermal rearrangement of the salt VII takes place at 200° to give 1-benzoyl-2-methylhydrazine, which with phosgene forms the isomer XI. Some mechanistic pathways for these transformations are discussed.
From S,S-diorganosulfodiimides 1a-e with diphenylcyanimidocarbonate (2) via condensation products 3a-e and 6a-d novel heterocycles were obtained. In DMF 3a-c react with aliphatic amines to form 1λ4,2,4,6-thiatriazines 4a-e and 5a, b. With HCl 6a-d can be cyclized to give 1λ6,2,4,6-thiatriazine hydrochlorides 8a-d. These are thermally converted into 1λ4,2,4,6-thiatriazines 4a, f, g. Condensation of 6a with orthoesters and paraformaldehyde affords 1λ6,2,4,6- thiatriazines 9a, b and 10a, whereas 3a, e undergoes ring closure with methyl hydrazine to 1,2,4- triazoles 11a, e.
Methyl-hydrazine Deoxidize Tc(VII) in Nitric Acid in Presence of U(VI) and Behavior of Technetium in the U/Pu Splitting Stage of APOR Process