4-oxadiazol-2-oneForty-four compounds of nitrofuranvinyl-1,3,4-oxadiazol-2-one and its 1,3,4-oxadiazole have been synthesized. The key intermediate, α-substituted 5-nitro-2-furylacryloylhydrazine, was prepared by known method and it reacted subsequently with phosgen or bromocyanogen to ...