An efficient route to polyiodopyrazoles, 3,4,5-triiodopyrazole (1), 1-methyl-3,4,5-triiodopyrazole (2) and 1-diiodomethyl-3,4,5-triiodopyrazole (3), opens the door to prospective biocides. Nitration of 1 and 2 gives the previously inaccessible compounds, 3,4-dinitro-5-iodopyrazole (4), and 3,4-dinitro-5-iodo-1-methylpyrazole (5), respectively. These synthetic pathways will open many fronts for pyrazole chemistry.
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Chand et al. (2015) studied this question.
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