In the presence of catalytic amount of cobalt acetate(II), manganese acetate(II) and bromide ion, the selective oxidation of 3,5-dichloro-1,4-dimethylpyrazole with molecular oxygen afforded 3,5-dichloro-1-methylpyrazole-4-carboxylic acid in more than 95% yield.
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Tanaka et al. (1991) studied this question.
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