[F:1][C:2]([F:16])([CH:13]([F:15])[F:14])[CH2:3][O:4][C:5]1[CH:10]=[CH:9][C:8]([CH2:11][OH:12])=[CH:7][N:6]=1>[O-2].[O-2].[Mn+4]>[F:16][C:2]([F:1])([CH:13]([F:15])[F:14])[CH2:3][O:4][C:5]1[CH:10]=[CH:9][C:8]([CH:11]=[O:12])=[CH:7][N:6]=12-(2,2,3,3-Tetrafluoropropoxy)-5-(hydroxymethyl)pyridine was treated with active manganese dioxide in the same manner as in Reference example 22 to obtain the title compound as an oil in a yield of 96%.
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