2-(Tri-n-butylstannyl)thiophene → 5,6-Difluoro-4,7-di(thiophen-2-yl)benzo[c][1,2,5]thiadiazole

Participants

Reaction Conditions

Reaction Steps

4,7-Dibromo-5,6-difluoro-benzo[1,2,5]thiadiazole (0.29 g, 1 mmol), tributyl-thiophen-2-yl-stannane (0.86 g, 2.3 mmol), and Pd(PPh3)4 (20 mg) were combined into a 50-mL Schlenk flask. The system was vacuumed and backfilled with argon for three cycles before 20 mL anhydrous toluene was added. The mixture was heated at 105° C. for 4 days. After the reaction was cooled down, the solvent was removed by rotary evaporation. The product was further purified by silica gel column with toluene/hexane (v/v, 1/2) as the eluent and recrystallization from a hexane/iso-propoanol mixture. The final product (0.276 g, 93.0% yield) was obtained as red needle crystals after being dried in vacuo. 1H NMR (CDCl3, 500 MHz): δ 8.33 (d×d, 2H, J=4.0 Hz×1.0 Hz), δ 7.66 (d×d, 2H, J=5.5 Hz×1.0 Hz), δ 7.30 (d×d, 2H, J=5.5 Hz×4.0 Hz)

Provenance & Evidence