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4H,8H-Bis-(1,2,5-oxadiazolo) [3,4-b:3',4'-e]pyrazine and Some Derivatives. -Several chemical transformations of the title bisoxadiazolopyrazine (I) are studied. Compound (I) does not undergo direct nitration in the presence of nitric acid. Instead, an oxidative dehydrogenation or destruction of one furazane cycle is observed. Nitration as well as nitrosylation products (XVII) and (XIX), however, are obtained by reaction of the dipotassium salt of compound (I) with dinitrogentetra-and pentoxide. The weak NH-acid compound (I) undergoes base-mediated alkylation/arylation or addition of alkenes. Thus, with alkyl(aryl) halides (VII), the corresponding N,N'-dialkyl(aryl) derivatives (VIII) are formed and with methylvinylketone (V), the di(methylcarbonylethyl) analogue (VI) is obtained. Additionally, the dinitromethyl(ethyl) derivatives (X) and (XIV) are prepared, which can act as CH-as well as NH-acids. -(TSELINSKII, I. V.; MEL'NIKOVA, S. F.; ROMANOVA, T. V.; PIROGOV, S. V.; KHISAMUTDINOV, G. KH.; MRATKHUZINA, T. A.; KOROLEV, V. L.; KONDYUKOV, I. Z.; ABDRAKHMANOV, I. SH.; SMIRNOV, S. P.; Zh.