[CH2:1]([C:3]12[CH2:12][CH:7]3[CH2:8][CH:9]([CH2:11][CH:5]([CH2:6]3)[CH2:4]1)[CH2:10]2)[CH3:2].[Br:13]Br.S([O-])([O-])=O.[Na+].[Na+]>>[Br:13][C:5]12[CH2:11][CH:9]3[CH2:8][CH:7]([CH2:12][C:3]([CH2:1][CH3:2])([CH2:10]3)[CH2:4]1)[CH2:6]2Mix 0.034 mol of ethyl adamantane with a ten times excess of bromine (0.33 mol). Heat slowly and stir under reflux for 4 hrs. Then allow to cool and pour onto ice water. Decompose the excess bromine with sodium sulfite until discoloration of the aqueous solution. Subsequently extract with ether, wash the combined organic phases with sodium bicarbonate solution, dry with magnesium sulfate, filter and evaporate to dryness under vacuum. Recrystallize the residue from methanol. (Yield: 83%).
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