The synthesis of various N‐1 substituted ethyl 4‐pyrazolecarboxylates via reaction of ethyl 2‐formyl‐3‐oxo‐propionate (= ethoxycarbonylmalondialdehyde) with appropriately substituted hydrazines is described. Moreover, detailed nmr‐spectroscopic investigations with the title compounds are presented.
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Hölzer et al. (1993) studied this question.
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