Br[CH:2]([CH2:7][CH2:8][CH2:9][CH3:10])[C:3]([O:5][CH3:6])=[O:4].[F-:11].[K+]>C(N)(=O)C>[F:11][CH:2]([CH2:7][CH2:8][CH2:9][CH3:10])[C:3]([O:5][CH3:6])=[O:4]Methyl 2-bromocaproate (40 g) was added to anhydrous potassium fluoride (23 g) in acetamide (23 g) kept at 105° C. The mixture was vigorously stirred at 105° C. for 6 hours. The crude product obtained after the conventional work-up was distilled. Yield; 20 g (71 %), b.p.; 66° C./20 mmHg
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