[CH2:1]([C:11]1[C:18]2[S:17][C:16]3[CH:19]=[CH:20][S:21][C:15]=3[C:14]=2[S:13][CH:12]=1)[CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH3:10].[Br:22]N1C(=O)CCC1=O.O>CN(C=O)C>[Br:22][C:12]1[S:13][C:14]2[C:15]3[S:21][CH:20]=[CH:19][C:16]=3[S:17][C:18]=2[C:11]=1[CH2:1][CH2:2][CH2:3][CH2:4][CH2:5][CH2:6][CH2:7][CH2:8][CH2:9][CH3:10]3-decanyldithieno[3,2-b:2′,3′-d]thiophene (91) (9.03 g, 0.027 mol) is dissolved in DMF (100 mL). To this solution, N-bromosuccinimide (NBS) (4.78 g, 0.027 mol) in DMF (50 mL) is added dropwise in the dark and under argon. The resulting mixture is stirred at 0° C. for about three hours or until GC/MS shows a single peak at 415. This solution is poured into water (500 mL) and the organic solution is extracted with hexane (3×100 mL). The combined organic solutions are washed with brine (2×50 mL) and water (50 mL). After drying over MgSO4, the hexane is evaporated. The crude product is purified by column chromatography and eluted with hexane to yield the target compound (10.1 g, 90.2% yield). 1HNMR (CD2Cl2): δ 7.39 (d, 1H), 7.29 (d, 1H), 2.74 (t, 2H), 1.74-1.33 (m, 16H), 0.89 (t, 3H). 13CNMR: 140.89, 140.63, 136.00, 131.55, 129.22, 126.58, 121.04, 108.89, 32.31, 29.94, 29.73 (overlap), 29.35, 28.49, 23.09, 14.27.
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