Fluorinated 1,3‐diketone compounds having the general structure CF3COCH2COR1 underwent cyclization with 4‐trifluoromethyl‐2‐hydrazinopyridines (IV) to give a series of 3‐trifluoro‐methyl‐1‐(4‐trifluoromethyl‐2‐pyridyl)‐pyrazoles (V). The hydrazinopyridine intermediates (IV) were prepared by conversion of 4‐trifluoromethyl‐2‐pyridones (II) to the chloropyridines (III) followed by treatment of the latter with hydrazine hydrate.
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