[Zn:1].II.[Br:4][CH2:5][CH:6]1[CH2:11][CH2:10][C:9]([F:13])([F:12])[CH2:8][CH2:7]1>CC(N(C)C)=O>[Br-:4].[F:12][C:9]1([F:13])[CH2:10][CH2:11][CH:6]([CH2:5][Zn+:1])[CH2:7][CH2:8]1Zinc powder (1.43 g, 21.87 mmol) was added to a dried flask and was heated at 70° C. under vacuum for 30 minutes. Dry DMA (29 mL) and iodine (0.092 g, 0.37 mmol) were added and the mixture was heated at 70° C. until the red-brown colour had disappeared (approx. 5 minutes). 4-(Bromomethyl)-1,1-difluorocyclohexane (3.1 g, 14.55 mmol) was added and heating was continued for ca. 42 h. The resulting solution was used in the next transformation.
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