Abstract
Treatment of 3-amino-4-(tert-butyl)azoxyfurazan with NO2BF4 in MeCN gives [1,2,5]oxadiazolo[3,4-e][1,2,3,4]tetrazine 4,6-di-N-oxide 2; 15N labelling experiments allowed the spectra of 2 to be fully assigned and provided support for the proposed structure. Diazonium oxide cation is proposed as the intermediate in ring closure.
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