New general synthesis of tetrahydro??1, 2, 4, 5??tetrazin??3 (2H)??one derivatives and stable 3, 4??dihydro??3??oxo??1, 2, 4, 5??tetrazin??1 (2H)??yl radical derivatives
Abstract Reactions of 2-chloroformylhydrazones of aromatic aldehydes or ketones 2 with various hydrazines were converted to monocarbonohydrazone derivatives 3 or 5 and/or tetrahydro-1, 2, 4, 5-tetrazin-3 (2H)-one derivatives 6, 7. By oxidation with lead dioxide, compounds 6 were transformed into stable 3, 4-dihydro-3-oxo-1, 2, 4, 5-tetrazin-1 (2H)-yl radical derivatives 8.
