Grimmett, M. Ross et al. published their research in Australian Journal of Chemistry in 1978 | CAS: 54210-32-1

1-Methyl-3-nitro-1H-pyrazole (cas: 54210-32-1) belongs to pyrazole derivatives. As is the case with imidazoles, the pyrazole ring offers many opportunities to create new multiring systems that incorporate this heterocycle. Protonation of pyrazole in strong acid leads to pyrazolium cations, which undergo electrophilic substitution preferentially at C3 rather than C4. The pyrazole anion is not reactive toward nucleophiles but is mostly reactive to electrophiles.Quality Control of 1-Methyl-3-nitro-1H-pyrazole

Dinitration of 1-methylpyrazole: 1-methyl-3,4-dinitropyrazole was written by Grimmett, M. Ross;Lim, K. H. Richard. And the article was included in Australian Journal of Chemistry in 1978.Quality Control of 1-Methyl-3-nitro-1H-pyrazole This article mentions the following:

Nitration in 80% H2SO4 of 1-methylpyrazole gives 1-methyl-4-nitropyrazole and 1-methyl-3,4-dinitropyrazole in a 4:1 ratio. The dinitro compound is also formed by nitration of 1-methyl-3-nitropyrazole. In the experiment, the researchers used many compounds, for example, 1-Methyl-3-nitro-1H-pyrazole (cas: 54210-32-1Quality Control of 1-Methyl-3-nitro-1H-pyrazole).

1-Methyl-3-nitro-1H-pyrazole (cas: 54210-32-1) belongs to pyrazole derivatives. As is the case with imidazoles, the pyrazole ring offers many opportunities to create new multiring systems that incorporate this heterocycle. Protonation of pyrazole in strong acid leads to pyrazolium cations, which undergo electrophilic substitution preferentially at C3 rather than C4. The pyrazole anion is not reactive toward nucleophiles but is mostly reactive to electrophiles.Quality Control of 1-Methyl-3-nitro-1H-pyrazole

Referemce:
Pyrazole – Wikipedia,
Pyrazoles – an overview | ScienceDirect Topics