Synthetic exploitation of the ring-opening of 3,4-dinitrothiophene. Part 7. Access to disubstituted 1,2,5-oxadiazole-2-oxides and 2-phenyl-2H-1,2,3-triazole-1-oxides

Article abstract of DOI:10.1016/S0040-4020(96)01086-1

1,4-Dialkyl- and 1,4-diaryl-2,3-bis(hydroxyimino)butanes 7, from reduction of the corresponding 1,4-disubstituted 2,3-dinitro-1,3-butadienes 2, are transformed with satisfactory yields into 3,4-disubstituted 1,2,5-oxadiazole-2-oxide 5 and 4,5-disubstitute