Synthèse et détermination de la structure de la 3H-(indazolyl-3′)-5 oxadiazol-1,3,4-one-2 par RMN 13C et spectrometrie de masse

The 3H-5-(3′-indazolyl)-1,3,4-oxadiazol-2-one was obtained by cyclising the hydrazide of the 3-indazolecarboxylic acid with carbonyl chloride. The structure was assigned by ¹³C nmr and mass spectrometry comparing the 2H, 3H-triazino-1,2,34,5-b]indazoledione-1,4. Rearrangement into 3H-5-(3′-indazolyl)-1,3,4-oxadiazol-2-one precedes the fragmentation of 2H,3H-triazino-1,2,4-4,5-b]indazoledione-1,4 upon electron-impact.