p-Nitrobenzhydroxamoyl chloride was treated with ammonium thiocyanate in methanol at room temperature for 3 days to afford p-nitrophenylthiourethane (3), though the similar treatment of 5-nitro-2-furylhydroxamoyl chloride afforded 3- (5 nitro-2-furyl) -5-imino-1, 2, 4-oxadiazole (2). Similar treatment of p-, m-nitrobenzhydroxamoyl chloride and 5-nitro-2-furylhydroxamoyl chloride with potassium cyanate afforded the corresponding oxadiazolones (4).
