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Improved procedures for the regioselective preparation of ethyl 1,5‐diarylpyrazole‐3‐carboxylates are described. The new procedures utilize readily prepared lithium aroylpyruvate intermediates which, when combined with arylphenylhydrazine hydrochlorides form 1,5‐diarylpyrazole‐3‐carboxylates regioselectively in good to excellent yield.
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Murray et al. (1989) studied this question.
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