The kinetics of nitration of 1-phenylpyrazole and its 4- and 4′-nitro-derivatives, and the corresponding 2-methyl quaternary salts are used to elucidate the species which undergo nitration. The nitration rates are compared within the series and with those of other heteroaromatic compounds.
A. G. Burton, A. R. Katritzky, M. Konya and H. O. Tarhan, J. Chem. Soc., Perkin Trans. 2, 1974, 389 DOI: 10.1039/P29740000389
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