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Dinitroglycolurils and 1,4,6-trinitrohexahydroimidazo[4,5- d ]imidazol-2(1 H )-one were prepared in 56–89% yield by N-nitration of the corresponding glycoluril precursors with dinitrogen pentoxide in liquid carbon dioxide.
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Zharkov et al. (2015) studied this question.
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