4‐phenyl‐4<i>H</i>‐pyrazolo[3,4‐<i>c</i>] furazans. The reactions of 3,4‐dacylfuroxans with phenylhydrazine and with aniline

Abstract

Abstract Three different 3,4‐diaeylfuroxans (1) are shown to give 3‐substituted‐l‐phenyl‐4,5‐dioximino‐2‐pyrazolines (2) upon reaction with phenylhydrazine. The compounds 2 were dehydrated to 6‐sul)stituted‐4‐phenyl‐4 H ‐pyrazolo[3,4‐ c ]furazans. ( 3 ) and thermally converted to 3‐substituted 5‐imino‐4‐oximino‐1‐phenyl‐2‐pyrazolines ( 6 ). The compounds 1 react with aniline to give 3‐anilino‐4‐acylfurazans ( 10 ).