[F:1][C:2]([C:17]([F:20])([F:19])[F:18])([O:6][C:7]([F:16])([F:15])[C:8]([F:14])([F:13])[C:9]([F:12])([F:11])[F:10])[C:3](F)=[O:4].C[Si](C)(C)[O-:23].[Na+:26]>ClC1C=CC=CC=1Cl>[F:1][C:2]([C:17]([F:18])([F:19])[F:20])([O:6][C:7]([F:15])([F:16])[C:8]([F:13])([F:14])[C:9]([F:12])([F:10])[F:11])[C:3]([O-:4])=[O:23].[Na+:26]The procedure of Example 1 was followed using perfluoro-2-methyl-3-oxahexanoyl fluoride (16.6 g, 50 mmol), sodium trimethylsilanolate (5.6 g, 50 mmol), dry o-dichlorobenzene (200 mL), and 1 h at room temperature followed by rapid heating to 150°. Sodium perfluoro-2-methyl-3-oxahexanoate (13.6 g, 77% yield) was isolated as a white solid: The 19F NMR data were the same as reported in Example 15.
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