Zur Reaktion von Quadratsäuredimethylester mit N,N-disubstituierten Hydrazin-Derivaten

The Reaction of Squaric Acid Dimethyl Ester with N,N-Disubstituted Hydrazines Reaction of 3,4-dimethoxy-3-cyclobutene-1,2-dione (2) with N,N-disubstituted hydrazines yields 3,4-bishydrazino-3-cyclobutene-1,2-diones 3 , which are converted into 3-amino-4-hydrazino-3-cyclobutene-1,2-diones 6 with N-N splitting by refluxing in ethanol.