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Aroylhydrazines 2 reacted with 3‐benzylidene‐2,4‐pentanedione (1) to give 1‐aroyl‐3,5‐dimethyl‐1H‐pyrazoles 5 and benzaldehyde aroylhydrazones 6. From the reaction of 3‐methoxymethylene‐2,4‐pentanedione (7) with aroylhydrazines 2 the unknown N‐aroyl‐4‐acetyl‐1H‐pyrazoles 9 were exclusively isolated in good yields.
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Mitkidou et al. (1993) studied this question.
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