Studies in the chemistry of 1,2,5-oxadiazole (II). Synthesis and properties of furazanodiazepines

This paper describes the synthesis and the properties of some furazanodiazepine derivatives obtained by condensing the appropriate β-diketones with 3,4-diaminofurazan. On the basis of U.V., I.R. and N.M.R. evidence a mono-imino structure is suggested for the compounds obtained. Low temperature N.M.R. spectra suggest a rapid tautomensm for the dimethyl derivative.