Nitration in 80% sulphuric acid 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.
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Grimmett et al. (1978) studied this question.
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