3,4-Bishydroxymethylpyrazole was prepared by reduction of diethyl pyrazole-3,4-dicarboxylate and of SS-diethyl pyrazole-3,4-dicarbothioate. A reduction of dimethyl pyrazole-3,4-dicarboxylate to methyl 4-formylpyrazole-3-carboxylate is also described.
C. V. Greco and F. Pellegrini, J. Chem. Soc., Perkin Trans. 1, 1972, 720 DOI: 10.1039/P19720000720
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