The kinetics of nitration of 1,4-dimethyl- and 4-methyl-1-p-nitrophenylpyrazole at the 3-position, and of 1,4-dimethyl-3-nitropyrazole at the 5-position show that these reactions all proceed on free base species. Standard rate constants (ko) are calculated and compared with those for the nitration of related compounds.
A. R. Katritzky, H. O. Tarhan and B. Terem, J. Chem. Soc., Perkin Trans. 2, 1975, 1632 DOI: 10.1039/P29750001632
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