UV and PMR spectral data and CO frequencies of some methylpyrazoles containing in the 3‐, 4‐ or 5‐position, a formyl‐, acetyl‐ or ethoxycarbonyl group are reported. These data confirm earlier conclusions that, in particular, the 4‐pyrazolyl group acts as an electron releasing group. The syntheses of a number of formyl‐, acetyl‐ and ethoxycarbonyl pyrazoles are described. In addition, some 4‐dicyanovinyl‐ and 4‐tricyanovinylpyrazoles were investigated.
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Wijnberger et al. (1969) studied this question.
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