Cyclization of 1-phenylpropane-1,2-dione monoarylhydrazones under Vilsmeier-Haack conditions gave 1-aryl-3-benzoyl-4-formylpyrazoles which were converted to 1-aryl-3-benzoyl-4-carboxypyrazoles using potassium permanganate in aqueous pyridine medium.
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