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■ Synthesis of 1-Aryl-3-phenylsulfonyl-1,2,4-triazoles from 1,5-Diaryl-3-phenylsulfonylformazans

Masahiko Takahashi and Sachio Ohnishi

*Department of Materials Sciences, Faculty of Engineering, Ibaraki University, 4-12-1 Nakanarusawamachi, Hitachi, Ibaraki 316-8511, Japan

Abstract

1,5-Diaryl-3-phenylsulfonylformazans (5) were prepared through phenylsulfonylmethanal arylhydrazones (4) starting from methyl phenyl sulfone. Treatment of these formazans (5) with formalin and potassium hydrogen sulfate in DMF gave 1-aryl-3-phenylsulfonyl-1,2,4-triazoles (9) instead of the expected 1,5-diaryl-3-phenysulfonylverdazyls (8).