Synthesis of 4-amino-3,5-dinitro-1H-pyrazole using vicarious nucleophilic substitution of hydrogen

A novel synthesis of the title compound was achieved by direct amination us ing Vicarious Nucleophilic Substitution (VNS) methodology. Reaction of 1,1, 1-trimethylhydrazinium iodide with 3,5-dinitropyrazole in DMSO produces 4-a mino-3,5-dinitro-1H-pyrazole as a 1:1 crystal solvate with DMSO. Recrystall ization from water yields the monohydrated crystal. Recrystallization of th e monohydrate from butyl acetate yields the compound in pure form.